Blame - www/command-line-options.html - platform/external/ImageMagick

blob: c2b8ecc844f9668ac9c474a1eafdbe773a348eca [file] [log] [blame]

cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	1
				2
				3
				4
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5	<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN"
				6	"http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
				7	<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" dir="ltr">
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	8	<head>
cristy	3c98a4f	2010-08-13 20:09:41 +0000	[diff] [blame]	9	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
				10	<meta name="verify-v1" content="g222frIIxcQTrvDR3NBRUSKP3AnMNoqxOkIniCEkV7U="/>
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	11	<title>ImageMagick: Command-line Options</title>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	12	<meta http-equiv="Content-Language" content="en-US"/>
				13	<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
				14	<meta http-equiv="Reply-to" content="magick-users@imagemagick.org"/>
cristy	3c98a4f	2010-08-13 20:09:41 +0000	[diff] [blame]	15	<meta name="Application-name" content="ImageMagick"/>
cristy	af8d665	2011-02-04 21:57:45 +0000	[diff] [blame]	16	<meta name="Description" content="Use ImageMagick to convert, edit, or compose bitmap images in a variety of formats. In addition resize, rotate, shear, distort and transform images."/>
cristy	3c98a4f	2010-08-13 20:09:41 +0000	[diff] [blame]	17	<meta name="Application-url" content="http://www.imagemagick.org"/>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	18	<meta name="Generator" content="PHP"/>
				19	<meta name="Keywords" content="command-line, options, ImageMagick, ImageMagic, MagickCore, MagickWand, PerlMagick, Magick++, RMagick, PythonMagick, JMagick, TclMagick, Image, Magick, Magic, Wand, ImageMagickObject, Swiss, Army, Knife, Image, Processing"/>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	20	<meta name="Rating" content="GENERAL"/>
				21	<meta name="Robots" content="INDEX, FOLLOW"/>
				22	<meta name="Generator" content="ImageMagick Studio LLC"/>
				23	<meta name="Author" content="ImageMagick Studio LLC"/>
				24	<meta name="Revisit-after" content="2 DAYS"/>
				25	<meta name="Resource-type" content="document"/>
cristy	7e41fe8	2010-12-04 23:12:08 +0000	[diff] [blame]	26	<meta name="Copyright" content="Copyright (c) 1999-2011 ImageMagick Studio LLC"/>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	27	<meta name="Distribution" content="Global"/>
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	28	<link rel="icon" href="../images/wand.png"/>
cristy	3c98a4f	2010-08-13 20:09:41 +0000	[diff] [blame]	29	<link rel="shortcut icon" href="../images/wand.ico" type="images/x-icon"/>
				30	<link rel="meta" type="application/rdf+xml" title="ICI" href="http://imagemagick.org/ici.rdf"/>
cristy	7a40ba8	2011-01-08 20:31:18 +0000	[diff] [blame]	31	<link rel="stylesheet" href="http://www.google.com/cse/style/look/default.css" type="text/css" />
cristy	3c98a4f	2010-08-13 20:09:41 +0000	[diff] [blame]	32	<style type="text/css" media="all">
				33	@import url("../www/magick.css");
				34	</style>
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	35	<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js"></script>
cristy	361f466	2010-12-31 23:02:52 +0000	[diff] [blame]	36	<script type="text/javascript" src="../fancybox/jquery.fancybox-1.3.4.pack.js"></script>
				37	<link rel="stylesheet" type="text/css" href="../fancybox/jquery.fancybox-1.3.4.css" media="screen" />
				38	<script type="text/javascript">
				39	$(document).ready(function() {
				40	$("a[href$=.jpg],a[href$=.png],a[href$=.gif]").fancybox({
				41	'transitionIn' : 'elastic',
				42	'transitionOut' : 'elastic',
				43	'overlayShow' : false,
				44	'opacity' : true
				45	});
				46	});
				47	</script>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	48	</head>
				49
				50	<body id="www-imagemagick-org">
				51	<div class="titlebar">
				52	<a href="../index.html">
				53	<img src="../images/script.png" alt="[ImageMagick]"
				54	style="width: 350px; height: 60px; margin: 28px auto; float: left;" /></a>
				55	<a href="http://www.networkredux.com">
				56	<img src="../images/networkredux.png" alt="[sponsor]"
cristy	5292344	2011-01-15 22:54:31 +0000	[diff] [blame]	57	style="margin-top: 42px; border: 0px; float: left;" /></a>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	58	<a href="http://www.imagemagick.org/discourse-server/">
cristy	af8d665	2011-02-04 21:57:45 +0000	[diff] [blame]	59	<img src="../images/logo.jpg"
				60	alt="ImageMagick Logo"
cristy	178edaf	2011-01-23 03:42:39 +0000	[diff] [blame]	61	style="width: 123px; height: 118px; border: 0px; float: right;" /></a>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	62	<a href="../index.html">
cristy	af8d665	2011-02-04 21:57:45 +0000	[diff] [blame]	63	<img src="../images/sprite.jpg"
				64	alt="ImageMagick Sprite"
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	65	style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
				66	</div>
				67
cristy	ce69bb0	2010-07-27 19:49:46 +0000	[diff] [blame]	68	<div class="westbar">
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	69
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	70	<div class="menu">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	71	<a title="About ImageMagick" href="../index.html">About ImageMagick</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	72	</div>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	73	<div class="sep"></div>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	74	<div class="menu">
cristy	bb50337	2010-05-27 20:51:26 +0000	[diff] [blame]	75	<a title="Binary Releases" href="../www/binary-releases.html">Binary Releases</a>
				76	</div>
				77	<div class="sub">
				78	<a title="Binary Release: Unix" href="../www/binary-releases.html#unix">Unix</a>
				79	</div>
				80	<div class="sub">
				81	<a title="Binary Release: MacOS X" href="../www/binary-releases.html#macosx">Mac OS X</a>
				82	</div>
				83	<div class="sub">
				84	<a title="Binary Release: Windows" href="../www/binary-releases.html#windows">Windows</a>
				85	</div>
				86	<div class="sep"></div>
				87	<div class="menu">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	88	<a title="Command-line Tools" href="../www/command-line-tools.html">Command-line Tools</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	89	</div>
				90	<div class="sub">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	91	<a title="Command-line Tools: Processing" href="../www/command-line-processing.html">Processing</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	92	</div>
				93	<div class="sub">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	94	<a title="Command-line Tools: Options" href="../www/command-line-options.html">Options</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	95	</div>
				96	<div class="sub">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	97	<a title="Command-line Tools: Usage" href="http://www.imagemagick.org/Usage/">Usage</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	98	</div>
				99	<div class="menu">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	100	<a title="Program Interfaces" href="../www/api.html">Program Interfaces</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	101	</div>
				102	<div class="sub">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	103	<a title="Program Interface: MagickWand" href="../www/magick-wand.html">MagickWand</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	104	</div>
				105	<div class="sub">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	106	<a title="Program Interface: MagickCore" href="../www/magick-core.html">MagickCore</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	107	</div>
				108	<div class="sub">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	109	<a title="Program Interface: PerlMagick" href="../www/perl-magick.html">PerlMagick</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	110	</div>
				111	<div class="sub">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	112	<a title="Program Interface: Magick++" href="../www/magick++.html">Magick++</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	113	</div>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	114	<div class="sep"></div>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	115	<div class="menu">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	116	<a title="Install from Source" href="../www/install-source.html">Install from Source</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	117	</div>
				118	<div class="sub">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	119	<a title="Install from Source: Unix" href="../www/install-source.html#unix">Unix</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	120	</div>
				121	<div class="sub">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	122	<a title="Install from Source: Windows" href="../www/install-source.html#windows">Windows</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	123	</div>
				124	<div class="menu">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	125	<a title="Resources" href="../www/resources.html">Resources</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	126	</div>
cristy	bb50337	2010-05-27 20:51:26 +0000	[diff] [blame]	127	<div class="menu">
				128	<a title="Architecture" href="../www/architecture.html">Architecture</a>
				129	</div>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	130	<div class="menu">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	131	<a title="Download" href="../www/download.html">Download</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	132	</div>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	133	<div class="sep"></div>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	134	<div class="menu">
cristy	5292344	2011-01-15 22:54:31 +0000	[diff] [blame]	135	<a title="Search" href="../www/search.html">Search</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	136	</div>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	137	<div class="sep"></div>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	138	<div class="menu">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	139	<a title="Site Map" href="../www/sitemap.html">Site Map</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	140	</div>
				141	<div class="sub">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	142	<a title="Site Map: Links" href="../www/links.html">Links</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	143	</div>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	144	<div class="sep"></div>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	145	<div class="menu">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	146	<a title="Sponsors" href="../www/sponsors.html">Sponsors:</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	147
				148	<div class="sponsbox">
cristy	178edaf	2011-01-23 03:42:39 +0000	[diff] [blame]	149	<div class="sponsor">
cristy	af8d665	2011-02-04 21:57:45 +0000	[diff] [blame]	150	<a title="Sponsor: Best Web Hosting" href="http://webhostinggeeks.com">Best Web Hosting</a><!-- 201110010720 -->
				151	</div>
				152	<div class="sponsor">
				153	<a title="Sponsor: Web Hosting Ratings" href="http://webhostingrating.com">Web Hosting Ratings</a><!-- 201110010720 -->
				154	</div>
				155	<div class="sponsor">
cristy	178edaf	2011-01-23 03:42:39 +0000	[diff] [blame]	156	<a title="Sponsor: Druckerei" href="http://www.allesdruck.de">Druckerei</a><!-- 201106010240 -->
				157	</div>
cristy	ec6b475	2011-01-08 03:16:23 +0000	[diff] [blame]	158	<div class="sponsor">
cristy	5292344	2011-01-15 22:54:31 +0000	[diff] [blame]	159	<a title="Sponsor: Web Hosting" href="http://www.bodhost.com/hosting.shtml">Web Hosting</a><!-- 201104010090 -->
cristy	7d52cd6	2010-10-01 17:26:59 +0000	[diff] [blame]	160	</div>
				161	<div class="sponsor">
cristy	c5baf4f	2010-08-31 15:05:33 +0000	[diff] [blame]	162	<a title="Sponsor: Image Converter" href="http://www.batchphoto.com">Image Converter</a><!-- 201103010900 Bits Coffee-->
				163	</div>
				164	<div class="sponsor">
cristy	851dbce	2010-08-06 21:40:00 +0000	[diff] [blame]	165	<a title="Sponsor: Flyer drucken" href="http://www.online-druck.biz">Flyer drucken</a><!-- 201109010900 Floeter-->
				166	</div>
cristy	ec6b475	2011-01-08 03:16:23 +0000	[diff] [blame]	167	<div class="sponsor">
cristy	178edaf	2011-01-23 03:42:39 +0000	[diff] [blame]	168	<a title="Sponsor: Druckerei" href="http://print24.com/de/">Druckerei</a><!-- 201110010720 -->
				169	</div>
				170	<div class="sponsor">
cristy	70b59b6	2011-02-07 19:09:57 +0000	[diff] [blame]	171	<a title="Sponsor: Custom T-Shirts" href="http://www.ooshirts.com">Custom T-Shirts</a><!-- 2011050100030 ooshirts.com-->
cristy	ec6b475	2011-01-08 03:16:23 +0000	[diff] [blame]	172	</div>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	173	</div>
				174	</div>
cristy	ce69bb0	2010-07-27 19:49:46 +0000	[diff] [blame]	175	</div>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	176
cristy	ce69bb0	2010-07-27 19:49:46 +0000	[diff] [blame]	177	<div class="eastbar">
				178	<script type="text/javascript">
				179	<!--
				180	google_ad_client = "pub-3129977114552745";
cristy	ce69bb0	2010-07-27 19:49:46 +0000	[diff] [blame]	181	google_ad_slot = "0574824969";
				182	google_ad_width = 160;
				183	google_ad_height = 600;
				184	//-->
				185	</script>
				186	<script type="text/javascript"
				187	src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
				188	</script>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	189	</div>
				190
				191	<div class="main">
				192
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	193	<h1>Create, Edit, or Compose Bitmap Images With These Command-line Options</h1>
cristy	5cadd61	2009-09-21 19:33:41 +0000	[diff] [blame]	194	<p class="navigation-index">
cristy	2d67ddd	2011-02-13 15:38:23 +0000	[diff] [blame^]	195	[ <a href="../www/command-line-options.html#adaptive-blur">‑adaptive‑blur</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#adaptive-resize">‑adaptive‑resize</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#adaptive-sharpen">‑adaptive‑sharpen</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#adjoin">‑adjoin</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#affine">‑affine</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#alpha">‑alpha</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#annotate">‑annotate</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#antialias">‑antialias</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#append">‑append</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#attenuate">‑attenuate</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#authenticate">‑authenticate</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#auto-gamma">‑auto‑gamma</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#auto-level">‑auto‑level</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#auto-orient">‑auto‑orient</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#backdrop">‑backdrop</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#background">‑background</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#bench">‑bench</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#bias">‑bias</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#blackpoint-compensation">‑blackpoint‑compensation</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#black-threshold">‑black‑threshold</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#blend">‑blend</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#blue-primary">‑blue‑primary</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#blue-shift">‑blue‑shift</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#blur">‑blur</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#border">‑border</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#bordercolor">‑bordercolor</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#borderwidth">‑borderwidth</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#brightness-contrast">‑brightness‑contrast</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#cache">‑cache</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#caption">‑caption</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#cdl">‑cdl</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#channel">‑channel</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#charcoal">‑charcoal</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#chop">‑chop</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#clamp">‑clamp</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#clip">‑clip</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#clip-mask">‑clip‑mask</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#clip-path">‑clip‑path</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#clone">‑clone</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#clut">‑clut</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#coalesce">‑coalesce</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#colorize">‑colorize</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#colormap">‑colormap</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#color-matrix">‑color‑matrix</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#colors">‑colors</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#colorspace">‑colorspace</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#combine">‑combine</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#comment">‑comment</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#compose">‑compose</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#composite">‑composite</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#compress">‑compress</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#contrast">‑contrast</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#contrast-stretch">‑contrast‑stretch</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#convolve">‑convolve</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#crop">‑crop</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#cycle">‑cycle</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#debug">‑debug</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#decipher">‑decipher</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#deconstruct">‑deconstruct</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#define">‑define</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#delay">‑delay</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#delete">‑delete</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#density">‑density</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#depth">‑depth</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#descend">‑descend</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#deskew">‑deskew</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#despeckle">‑despeckle</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#direction">‑direction</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#displace">‑displace</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#display">‑display</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#dispose">‑dispose</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#dissimilarity-threshold">‑dissimilarity‑threshold</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#dissolve">‑dissolve</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#distort">‑distort</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#dither">‑dither</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#draw">‑draw</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#edge">‑edge</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#emboss">‑emboss</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#encipher">‑encipher</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#encoding">‑encoding</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#endian">‑endian</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#enhance">‑enhance</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#equalize">‑equalize</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#evaluate">‑evaluate</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#evaluate-sequence">‑evaluate‑sequence</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#extent">‑extent</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#extract">‑extract</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#family">‑family</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#features">‑features</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#fft">‑fft</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#fill">‑fill</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#filter">‑filter</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#flatten">‑flatten</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#flip">‑flip</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#floodfill">‑floodfill</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#flop">‑flop</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#font">‑font</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#foreground">‑foreground</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#format">‑format</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#format_identify_">‑format[identify]</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#frame">‑frame</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#frame_import_">‑frame[import]</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#function">‑function</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#fuzz">‑fuzz</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#fx">‑fx</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#gamma">‑gamma</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#gaussian-blur">‑gaussian‑blur</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#geometry">‑geometry</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#gravity">‑gravity</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#green-primary">‑green‑primary</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#hald-clut">‑hald‑clut</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#help">‑help</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#highlight-color">‑highlight‑color</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#iconGeometry">‑iconGeometry</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#iconic">‑iconic</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#identify">‑identify</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#ift">‑ift</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#immutable">‑immutable</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#implode">‑implode</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#insert">‑insert</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#intent">‑intent</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#interlace">‑interlace</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#interpolate">‑interpolate</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#interline-spacing">‑interline‑spacing</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#interword-spacing">‑interword‑spacing</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#kerning">‑kerning</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#label">‑label</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#lat">‑lat</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#layers">‑layers</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#level">‑level</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#level-colors">‑level‑colors</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#limit">‑limit</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#linear-stretch">‑linear‑stretch</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#linewidth">‑linewidth</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#liquid-rescale">‑liquid‑rescale</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#list">‑list</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#log">‑log</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#loop">‑loop</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#lowlight-color">‑lowlight‑color</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#magnify">‑magnify</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#map">‑map</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#map_stream_">‑map[stream]</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#mask">‑mask</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#mattecolor">‑mattecolor</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#median">‑median</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#metric">‑metric</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#mode">‑mode</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#modulate">‑modulate</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#monitor">‑monitor</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#monochrome">‑monochrome</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#morph">‑morph</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#morphology">‑morphology</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#mosaic">‑mosaic</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#motion-blur">‑motion‑blur</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#name">‑name</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#negate">‑negate</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#noise">‑noise</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#normalize">‑normalize</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#opaque">‑opaque</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#ordered-dither">‑ordered‑dither</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#orient">‑orient</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#page">‑page</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#paint">‑paint</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#path">‑path</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#pause_animate_">‑pause[animate]</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#pause_import_">‑pause[import]</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#pen">‑pen</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#ping">‑ping</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#pointsize">‑pointsize</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#polaroid">‑polaroid</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#posterize">‑posterize</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#precision">‑precision</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#preview">‑preview</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#print">‑print</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#process">‑process</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#profile">‑profile</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#quality">‑quality</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#quantize">‑quantize</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#quiet">‑quiet</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#radial-blur">‑radial‑blur</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#raise">‑raise</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#random-threshold">‑random‑threshold</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#red-primary">‑red‑primary</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#regard-warnings">‑regard‑warnings</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#region">‑region</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#remap">‑remap</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#remote">‑remote</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#render">‑render</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#repage">‑repage</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#resample">‑resample</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#resize">‑resize</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#respect-parentheses">‑respect‑parentheses</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#reverse">‑reverse</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#roll">‑roll</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#rotate">‑rotate</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#sample">‑sample</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#sampling-factor">‑sampling‑factor</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#scale">‑scale</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#scene">‑scene</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#screen">‑screen</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#seed">‑seed</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#segment">‑segment</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#selective-blur">‑selective‑blur</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#separate">‑separate</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#sepia-tone">‑sepia‑tone</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#set">‑set</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#shade">‑shade</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#shadow">‑shadow</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#shared-memory">‑shared‑memory</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#sharpen">‑sharpen</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#shave">‑shave</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#shear">‑shear</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#sigmoidal-contrast">‑sigmoidal‑contrast</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#silent">‑silent</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#size">‑size</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#sketch">‑sketch</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#smush">‑smush</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#snaps">‑snaps</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#solarize">‑solarize</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#sparse-color">‑sparse‑color</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#splice">‑splice</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#spread">‑spread</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#stegano">‑stegano</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#stereo">‑stereo</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#stretch">‑stretch</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#strip">‑strip</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#stroke">‑stroke</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#strokewidth">‑strokewidth</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#style">‑style</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#subimage-search">‑subimage‑search</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#swap">‑swap</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#swirl">‑swirl</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#synchronize">‑synchronize</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#taint">‑taint</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#text-font">‑text‑font</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#texture">‑texture</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#threshold">‑threshold</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#thumbnail">‑thumbnail</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#tile">‑tile</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#tile-offset">‑tile‑offset</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#tint">‑tint</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#title">‑title</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#transform">‑transform</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#transparent">‑transparent</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#transparent-color">‑transparent‑color</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#transpose">‑transpose</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#transverse">‑transverse</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#treedepth">‑treedepth</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#trim">‑trim</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#type">‑type</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#undercolor">‑undercolor</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#unique-colors">‑unique‑colors</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#units">‑units</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#unsharp">‑unsharp</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#update">‑update</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#verbose">‑verbose</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#version">‑version</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#view">‑view</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#vignette">‑vignette</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#virtual-pixel">‑virtual‑pixel</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#visual">‑visual</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#watermark">‑watermark</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#wave">‑wave</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#weight">‑weight</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#white-point">‑white‑point</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#white-threshold">‑white‑threshold</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#window">‑window</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#window-group">‑window‑group</a> <span class='bull'> • </span> <a href="../www/command-line-options.html#write">‑write</a> ] </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	196
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	197	<div class="doc-section">
				198
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	199	<p>Below is list of command-line options recognized by the ImageMagick <a
				200	href="../www/command-line-tools.html">command-line
				201	tools</a>. If you want a description of a particular option, click on the
				202	option name in the navigation bar above and you will go right to it. Unless
cristy	a890294	2010-07-30 00:49:52 +0000	[diff] [blame]	203	otherwise noted, each option is recognized by the commands <a href="../www/convert.html">convert</a>, <a href="../www/mogrify.html">mogrify</a>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	204
				205	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	206	<h4><a id="adaptive-blur"></a>-adaptive-blur <em class="arg">radius</em>[x<em class="arg">sigma</em>]</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	207	</div>
				208
				209	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Adaptively blur pixels, with decreasing effect near edges.</td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	210	<p>A Gaussian operator of the given radius and standard deviation (<em class="arg">sigma</em>) is used. If <em class="arg">sigma</em> is not given it defaults to 1.</p>
				211
				212	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	213	<h4><a id="adaptive-resize"></a>-adaptive-resize <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	214	</div>
				215
				216	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Resize the image using data-dependent triangulation.</td><td style='text-align:right;'></td></tr></table>
				217
				218	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument. The <a href="#adaptive-resize">-adaptive-resize</a> option defaults to data-dependent triangulation. Use the <a href="#filter">-filter</a> to choose a different resampling algorithm. Offsets, if present in the geometry string, are ignored, and the <a href="#gravity">-gravity</a> option has no effect.</p>
				219
				220	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	221	<h4><a id="adaptive-sharpen"></a>-adaptive-sharpen <em class="arg">radius</em>[x<em class="arg">sigma</em>]</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	222	</div>
				223
				224	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Adaptively sharpen pixels, with increasing effect near edges.</td><td style='text-align:right;'></td></tr></table>
				225
				226	<p>A Gaussian operator of the given radius and standard deviation (<em class="arg">sigma</em>) is used. If <em class="arg">sigma</em> is not given it defaults to 1.</p>
				227
				228	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	229	<h4><a id="adjoin"></a>-adjoin</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	230	</div>
				231
				232	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Join images into a single multi-image file.</td><td style='text-align:right;'></td></tr></table>
				233
				234	<p>This option is enabled by default. An attempt is made to save all
				235	images of an image sequence into the given output file.
				236	However, some formats, such as JPEG and PNG, do not support more than one
				237	image per file, and in that case ImageMagick is forced to write each image as a separate file. As
				238	such, if more than one image needs to be written, the filename given is
				239	modified by adding a <a href="#scene">-scene</a> number before the
				240	suffix, in order to make distinct names for each image. </p>
				241
				242	<p>Use <a href="#adjoin">+adjoin</a> to force each image to be written
				243	to separate files, whether or not the file format allows multiple images
				244	per file (for example, GIF, MIFF, and TIFF). </p>
				245
				246	<p>Including a C-style integer format string in the output filename will automagically enable <a href="#adjoin">+adjoin</a> and are used to specify where the <a href="#scene">-scene</a> number is placed in the filenames. These strings, such as '<kbd>%d</kbd>' or '<kbd>%03d</kbd>', are familiar to those who have used the standard <kbd>printf()</kbd>' C-library function. As an example, the command</p>
				247
				248	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert logo: rose: -morph 15 my%02dmorph.jpg</span></p>
				249	<p>will create a sequence of 17 images named my00morph.jpg, my01morph.jpg, my02morph.jpg, ..., my16morph.jpg.
				250	</p>
				251
				252	<p>In summary, ImageMagick tries to write all images to one file, but will use
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	253	multiple files if either<br />
				254	(1) the output image's file format does not allow multi-image files,<br />
				255	(2) the <a href="#adjoin">+adjoin</a> option is given, or<br />
				256	(3) a printf() integer format string (eg: "%d") is present in the output filename. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	257
				258
				259	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	260	<h4><a id="affine"></a>-affine <em class="arg">s<sub>x</sub></em>,<em class="arg">r<sub>x</sub></em>,<em class="arg">r<sub>y</sub></em>,<em class="arg">s<sub>y</sub></em>,<em class="arg">t<sub>x</sub></em>,<em class="arg">t<sub>y</sub></em><br/>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	261	-affine <em class="arg">s<sub>x</sub></em>,<em class="arg">r<sub>x</sub></em>,<em class="arg">r<sub>y</sub></em>,<em class="arg">s<sub>y</sub></em></h4>
				262	</div>
				263
				264	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the drawing transformation matrix for combined rotating and scaling.</td><td style='text-align:right;'></td></tr></table>
				265
				266	<p>This option sets a transformation matrix, encoded as (<em class="arg">s<sub>x</sub></em>, <em class="arg">r<sub>x</sub></em>, <em class="arg">r<sub>y</sub></em>, <em class="arg">s<sub>y</sub></em>, <em class="arg">t<sub>x</sub></em>, <em class="arg">t<sub>y</sub></em>), for use by subsequent <a href="#draw">-draw</a> or <a href="#transform">-transform</a> options.</p>
				267
				268	<p>The matrix entries are entered as comma-separated numeric values <i>with no spaces</i>. </p>
				269
				270	<p>Internally, the transformation matrix has 3x3 elements, but three of them are omitted from the input because they are constant. The new (transformed) coordinates (<em class="arg">x'</em>, <em class="arg">y'</em>) of a pixel at position (<em class="arg">x</em>, <em class="arg">y</em>) in the original image are calculated using the following matrix equation.</p>
				271
				272	<div class="eqn">
				273	<img alt="affine transformation" src="../images/affine.png"/>
				274	</div>
				275
				276	<p>
				277	The size of the resulting image is that of the smallest rectangle that contains the transformed source image. The parameters <em class="arg">t<sub>x</sub></em> and <em class="arg">t<sub>y</sub></em> subsequently shift the image pixels so that those that are moved out of the image area are cut off.</p>
				278
				279	<p>The transformation matrix complies with the left-handed pixel coordinate system: positive <em class="arg">x</em> and <em class="arg">y</em> directions are rightward and downward, resp.; positive rotation is clockwise.</p>
				280
				281	<p> If the translation coefficients <em class="arg">t<sub>x</sub></em> and <em class="arg">t<sub>y</sub></em> are omotted they default to 0,0. Therefore, four parameters suffice for rotation and scaling without translation.</p>
				282
				283	<p>Scaling by the factors <em class="arg">s<sub>x</sub></em> and <em class="arg">s<sub>y</sub></em> in the <em>x</em> and <em>y</em> directions, respectively, is accomplished with the following.</p>
				284
				285	<p class="crtsnip">
				286	-affine <em class="arg">s<sub>x</sub></em>,0,0,<em class="arg">s<sub>y</sub></em>
				287	</p>
				288
				289	<p>Translation by a displacement (<em class="arg">t<sub>x</sub></em>, <em class="arg">t<sub>y</sub></em>) is accomplished like so:</p>
				290
				291	<p class="crtsnip">
				292	-affine 1,0,0,1,<em class="arg">t<sub>x</sub></em>,<em class="arg">t<sub>y</sub></em>
				293	</p>
				294
				295	<p>Rotate clockwise about the origin (the upper left-hand corner) by an angle <em>a</em> by letting
				296	<em>c</em> = cos(<em>a</em>), <em>s</em> = sin(<em>a</em>), and using the following.</p>
				297
				298	<p class="crtsnip">
				299	-affine <em>c</em>,<em>s</em>,-<em>s</em>,<em>c</em>
				300	</p>
				301
				302	<p>The cumulative effect of a sequence of <a href="#affine" >-affine</a> transformations can be accomplished by instead by a single <a href="#affine" >-affine</a> operation using the matrix equal to the product of the matrices of the individual transformations.</p>
				303
				304	<p>An attempt is made to detect near-singular transformation matrices. If the matrix determinant has a sufficiently small absolute value it is rejected.</p>
				305
				306	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	307	<h4><a id="alpha"></a>-alpha <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	308	</div>
				309
				310	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Gives control of the alpha/matte channel of an image.</td><td style='text-align:right;'></td></tr></table>
				311
				312	<p>Used to set a flag on an image indicating whether or not to use existing alpha
				313	channel data, to create an alpha channel, or to perform other operations on the alpha channel. Choose the argument <em class="arg">type</em> from the list below.</p>
				314
				315
				316	<table class="doc">
				317	<tbody>
				318	<tr valign="top">
				319	<th align="left" style="width: 8%">type</th>
				320	<th align="left">Description</th>
				321	</tr>
				322
				323	<tr valign="top">
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	324	<td valign="top"><kbd>Activate</kbd> or <kbd>On</kbd></td>
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	325	<td valign="top">
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	326	Enable the image's transparency channel. Note normally <kbd>Set</kbd>
				327	should be used instead of this, unless you specifically need to
				328	preserve existing (but specifically turned <kbd>Off</kbd>) transparency
				329	channel. </td></tr>
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	330
				331	<tr valign="top">
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	332	<td valign="top"><kbd>Deactivate</kbd> or <kbd>Off</kbd></td>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	333	<td valign="top">
				334	Disables the image's transparency channel. Does not delete or change the
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	335	existing data, just turns off the use of that data.</td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	336
				337	<tr valign="top">
				338	<td valign="top"><kbd>Set</kbd></td>
				339	<td valign="top">
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	340	Activates the alpha/matte channel. If it was previously turned off
				341	then it also resets the channel to opaque. If the image already had
				342	the alpha channel turned on, it will have no effect.</td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	343
				344	<tr valign="top">
				345	<td valign="top"><kbd>Opaque</kbd></td>
				346	<td valign="top">
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	347	Enables the alpha/matte channel and forces it to be fully opaque.
				348	</td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	349
				350	<tr valign="top">
				351	<td valign="top"><kbd>Transparent</kbd></td>
				352	<td valign="top">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	353	Activates the alpha/matte channel and forces it to be fully
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	354	transparent. This effectively creates a fully transparent image the
				355	same size as the original and with all its original RGB data still
				356	intact, but fully transparent. </td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	357
				358	<tr valign="top">
				359	<td valign="top"><kbd>Extract</kbd></td>
				360	<td valign="top">
				361	Copies the alpha channel values into all the color channels and turns
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	362	'<kbd>Off</kbd>' the the image's transparency, so as to generate
				363	a gray-scale mask of the image's shape. The alpha channel data is left
				364	intact just deactivated. This is the inverse of '<kbd>Copy</kbd>'.
				365	</td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	366
				367	<tr valign="top">
				368	<td valign="top"><kbd>Copy</kbd></td>
				369	<td valign="top">
				370	Turns '<kbd>On</kbd>' the alpha/matte channel, then copies the
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	371	gray-scale intensity of the image, into the alpha channel, converting
				372	a gray-scale mask into a transparent shaped mask ready to be colored
				373	appropriately. The color channels are not modified. </td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	374
				375	<tr valign="top">
				376	<td valign="top"><kbd>Shape</kbd></td>
				377	<td valign="top">
				378	As per '<kbd>Copy</kbd>' but also colors the resulting shape mask with
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	379	the current background color. That is the RGB color channels is
				380	replaced, with appropriate alpha shape.
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	381	</td></tr>
				382
				383	<tr valign="top">
				384	<td valign="top"><kbd>Background</kbd></td>
				385	<td valign="top">
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	386	Set any fully-transparent pixel to the background color, while leaving
				387	it fully-transparent. This can make some image file formats, such as
				388	PNG, smaller as the RGB values of transparent pixels are more uniform,
				389	and thus can compress better.
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	390	</td></tr>
				391	</tbody>
				392	</table>
				393
				394	<p>Note that while the <a href="#matte" >+matte</a> operation is the same as
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	395	"<kbd><a href="#alpha" >-alpha</a> Off</kbd>", the <a href="#matte"
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	396	>-matte</a> operation is the same as "<kbd><a href="#alpha" >-alpha</a>
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	397	Set</kbd>" and not "<kbd><a href="#alpha" >-alpha</a> On</kbd>". </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	398
				399
				400	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	401	<h4><a id="annotate"></a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	402	-annotate <em class="arg">degrees</em> <em class="arg">text</em><br />
				403	-annotate <em class="arg">Xdegrees</em>x<em class="arg">Ydegrees</em> <em class="arg">text</em><br />
				404	-annotate <em class="arg">Xdegrees</em>x<em class="arg">Ydegrees</em> {+-}<em class="arg">t<sub>x</sub></em>{+-}<em class="arg">t<sub>y</sub></em> <em class="arg">text</em></h4>
				405	</div>
				406
				407	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Annotate an image with text.</td><td style='text-align:right;'></td></tr></table>
				408
				409	<p>This is a convenience for annotating an image with text. For more precise control over text annotations, use <a href="#draw">-draw</a>.</p>
				410
				411
				412	<p>The values <em class="arg">Xdegrees</em> and <em class="arg">Ydegrees</em> control the shears with respect to the , respectively, applied to the text, while <em class="arg">t<sub>x</sub></em> and <em class="arg">t<sub>y</sub></em> are offsets that give the location of the text relative to the upper left corner of the image.</p>
				413
				414	<p>Using <a href="#annotate">-annotate</a> <em class="arg">degrees</em> or <a href="#annotate">-annotate</a> <em class="arg">degrees</em>x<em class="arg">degrees</em> produces an unsheared rotation of the text. The direction of the rotation is positive, which means a clockwise rotation if <em class="arg">degrees</em> is positive. (This conforms to the usual mathematical convention once it is realized that the positive <em>y</em>–direction is conventionally considered to be <em>downward</em> for images.)</p>
				415
				416	<p>The new (transformed) coordinates (<em class="arg">x'</em>, <em class="arg">y'</em>) of a pixel at position (<em class="arg">x</em>, <em class="arg">y</em>) in the image are calculated using the following matrix equation.</p>
				417	<div class="eqn"><img alt="annotate transformation" src="../images/annotate.png"/></div>
				418
				419	<p>If <em class="arg">t<sub>x</sub></em> and <em class="arg">t<sub>y</sub></em> are omitted, they default to 0. This makes the bottom-left of the text becomes the upper-left corner of the image, which is probably undesirable. Adding a <a href="#gravity" >-gravity</a> option in this case leads to nice results.</p>
				420
				421	<p>Text is any UTF-8 encoded character sequence. If <em class="arg">text</em> is of the form '@mytext.txt', the text is read from the file <kbd>mytext.txt</kbd>. Text in a file is taken literally; no embedded formatting characters are recognized.</p>
				422
				423	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	424	<h4><a id="antialias"></a>-antialias</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	425	</div>
				426
				427	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Enable/Disable of the rendering of anti-aliasing pixels when
				428	drawing fonts and lines.</td><td style='text-align:right;'></td></tr></table>
				429
				430	<p>By default, objects (e.g. text, lines, polygons, etc.) are antialiased when
				431	drawn. Use <a href="#antialias">+antialias</a> to disable the addition of
				432	antialiasing edge pixels. This will then reduce the number of colors added to
				433	an image to just the colors being directly drawn. That is, no mixed colors
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	434	are added when drawing such objects. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	435
				436	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	437	<h4><a id="append"></a>-append</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	438	</div>
				439
				440	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Join current images vertically or horizontally.</td><td style='text-align:right;'></td></tr></table>
				441
				442	<p>This option creates a single longer image image, by joining all the current
				443	images in sequence top-to-bottom. Use <a href="#append">+append</a> to
				444	stack images left-to-right. </p>
				445
				446	<p>If they are not of the same width, narrower images are padded with the
				447	current <a href="#background">-background</a> color setting, and their
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	448	position relative to each other can be controlled by the current <a
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	449	href="#gravity">-gravity</a> setting. </p>
				450
				451
				452	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	453	<h4><a id="attenuate"></a>-attenuate <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	454	</div>
				455
				456	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Lessen (or intensify) when adding noise to an image.</td><td style='text-align:right;'></td></tr></table>
				457
				458
				459	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	460	<h4><a id="authenticate"></a>-authenticate <em class="arg">password</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	461	</div>
				462
				463	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Decrypt a PDF with a password.</td><td style='text-align:right;'></td></tr></table>
				464
				465	<p>Use this option to supply a <em class="arg">password</em> for decrypting a PDF that has been encrypted using Microsoft Crypto API (MSC API). The encrypting using the MSC API is not supported.</p>
				466
				467	<p>For a different encryption method, see <a href="#encipher">-encipher</a> and <a href="#decipher">-decipher</a>. </p>
				468
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	469
				470
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	471	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	472	<h4><a id="auto-gamma"></a>-auto-gamma</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	473	</div>
				474
				475	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Automagically adjust gamma level of image.</td><td style='text-align:right;'></td></tr></table>
				476
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	477	<p>This calculates the mean values of an image, then applies a calculated <a
				478	href="#gamma" >-gamma</a> adjustment so that is the mean color exists in the
				479	image it will get a have a value of 50%. </p>
				480
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	481	<p>This means that any solid 'gray' image becomes 50% gray. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	482
				483	<p>This works well for real-life images with little or no extreme dark and
				484	light areas, but tend to fail for images with large amounts of bright sky or
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	485	dark shadows. It also does not work well for diagrams or cartoon like images.
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	486	</p>
				487
				488	<p>It uses the <a href="#channel" >-channel</a> setting, (including the
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	489	'<em>sync</em>' flag for channel syncronization), to determine which color
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	490	values is used and modified. As the default <a href="#channel"
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	491	>-channel</a> setting is '<em>RGB,sync</em>', channels are modified
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	492	together by the same gamma value, preserving colors. </p>
				493
				494
				495
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	496	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	497	<h4><a id="auto-level"></a>-auto-level</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	498	</div>
				499
				500	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Automagically adjust color levels of image.</td><td style='text-align:right;'></td></tr></table>
				501
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	502	<p>This is a 'perfect' image normalization operator. It finds the exact
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	503	minimum and maximum color values in the image and then applies a <a
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	504	href="#level" >-level</a> operator to stretch the values to the full range of
				505	values. </p>
				506
cristy	8354396	2009-10-16 19:04:28 +0000	[diff] [blame]	507	<p>The operator is not typically used for real-life images, image scans, or
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	508	JPEG format images, as a single 'out-rider' pixel can set a bad min/max values
				509	for the <a href="#level" >-level</a> operation. On the other hand it is the
				510	right operator to use for color stretching gradient images being used to
				511	generate Color lookup tables, distortion maps, or other 'mathematically'
				512	defined images. </p>
				513
				514	<p>The operator is very similar to the <a href="#normalize">-normalize</a>, <a
				515	href="#contrast-stretch" >-contrast-stretch</a>, and <a href="#linear-stretch"
				516	>-linear-stretch</a> operators, but without 'histogram binning' or 'clipping'
				517	problems that these operators may have. That is <a href="#auto-level"
cristy	8354396	2009-10-16 19:04:28 +0000	[diff] [blame]	518	>-auto-level</a> is the perfect or ideal version these operators. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	519
				520	<p>It uses the <a href="#channel" >-channel</a> setting, (including the
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	521	special '<em>sync</em>' flag for channel syncronization), to determine
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	522	which color values are used and modified. As the default <a
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	523	href="#channel" >+channel</a> setting is '<em>RGB,sync</em>', the
				524	'<em>sync</em>' ensures that the color channels will are modified
cristy	8354396	2009-10-16 19:04:28 +0000	[diff] [blame]	525	together by the same gamma value, preserving colors, and ignoring
				526	transparency. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	527
				528
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	529	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	530	<h4><a id="auto-orient"></a>-auto-orient</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	531	</div>
				532
				533	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Automagically orient (rotate) an image created by a digital camera.</td><td style='text-align:right;'></td></tr></table>
				534
cristy	8354396	2009-10-16 19:04:28 +0000	[diff] [blame]	535	<p>This operator reads and resets the EXIF image profile setting 'Orientation'
				536	and then performs the appropriate 90 degree rotation on the image to orient
				537	the image, for correct viewing. </p>
				538
				539	<p>This EXIF profile setting is usually set using a gravity sensor in digital
				540	camara, however photos taken directly downward or upward may not have an
				541	appropriate value. Also images that have been orientation 'corrected' without
				542	reseting this setting, may be 'corrected' again resulting in a incorrect
				543	result. If the he EXIF profile was previously stripped, the <a
				544	href="#auto-orient" >-auto-orient</a> operator will do nothing. </p>
				545
				546
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	547	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	548	<h4><a id="average"></a>-average</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	549	</div>
				550
				551	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Average a set of images.</td><td style='text-align:right;'></td></tr></table>
				552
				553	<p>An error results if the images are not identically sized.</p>
				554
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	555
				556	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	557	<h4><a id="backdrop"></a>-backdrop</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	558	</div>
				559
				560	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Display the image centered on a backdrop.</td><td style='text-align:right;'>[<a href="../www/animate.html">animate</a>, <a href="../www/display.html">display</a>]</td></tr></table>
				561
				562	<p>This backdrop covers the entire workstation screen and is useful for hiding other X window activity while viewing the image. The color of the backdrop is specified as the background color. The color is specified using the format described under the <a href="#fill">-fill</a> option.</p>
				563
				564	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	565	<h4><a id="background"></a>-background <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	566	</div>
				567
				568	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the background color.</td><td style='text-align:right;'></td></tr></table>
				569
				570	<p>The color is specified using the format described under the <a href="#fill">-fill</a> option. The default background color (if none is specified or found in the image) is white.</p>
				571
				572	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	573	<h4><a id="bench"></a>-bench <em class="arg">iterations</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	574	</div>
				575
				576	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Measure performance.</td><td style='text-align:right;'></td></tr></table>
				577
cristy	e637813	2009-10-26 20:05:17 +0000	[diff] [blame]	578	<p>Repeat the entire command for the given number of <em class="arg">iterations</em> and report the user-time and elapsed time. For instance, consider the following command and its output. Modify the benchmark with the -duration to run the benchmark for a fixed number of seconds and -concurrent to run the benchmark in parallel (requires the OpenMP feature).</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	579
cristy	e637813	2009-10-26 20:05:17 +0000	[diff] [blame]	580	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert logo: -resize 1000% -bench 5 logo.png</span><span class='crtout'>Performance: 5i 0.875657ips 6.880u 0:05.710</span></p>
				581	<p>In this example, 5 iterations were completed at 0.875657 iterations per second, using 6.88 seconds of the user's allotted time, for a total elapsed time of 5.71 seconds.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	582
				583	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	584	<h4><a id="bias"></a>-bias <em class="arg">value</em>{<em class="arg">%</em>}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	585	</div>
				586
				587	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Add bias when convolving an image.</td><td style='text-align:right;'></td></tr></table>
				588
				589	<p>This option shifts the output of <a href="../www/command-line-options.html#convolve">‑convolve</a> so that positive and negative results are relative to the specified bias value. </p>
				590
				591	<p>This is important for non-HDRI compilations of ImageMagick when dealing with convolutions that contain negative as well as positive values. This is especially the case with convolutions involving high pass filters or edge detection. Without an output bias, the negative values are clipped at zero.</p>
				592
				593	<p>When using an ImageMagick with the HDRI compile-time setting, <a href="../www/command-line-options.html#bias">‑bias</a> is not needed, as ImageMagick is able to store/handle any
				594	negative results without clipping to the color value range
				595	(0..QuantumRange).</p>
				596
				597	<p>See the discussion on HDRI implementations of ImageMagick on the page
				598	<a href="/www/high-dynamic-range.html">High Dynamic-Range Images</a>. For more about HDRI go the ImageMagick <a href="http://www.imagemagick.org/Usage/basics/#hdri">Usage</a> pages or this <a href="http://en.wikipedia.org/wiki/High_dynamic_range_imaging">Wikipedia</a> entry.
				599	</p>
				600
				601	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	602	<h4><a id="black-point-compensation"></a>-black-point-compensation</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	603	</div>
				604
				605	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Use black point compensation.</td><td style='text-align:right;'></td></tr></table>
				606
				607	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	608	<h4><a id="black-threshold"></a>-black-threshold <em class="arg">value</em>{<em class="arg">%</em>}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	609	</div>
				610
cristy	5cadd61	2009-09-21 19:33:41 +0000	[diff] [blame]	611	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Force to black all pixels below the threshold while leaving all pixels at or above the threshold unchanged.</td><td style='text-align:right;'></td></tr></table>
				612
				613	<p> The threshold value can be given as a percentage or as an absolute integer value within [0, <em class="QR">QuantumRange</em>] corresponding to the desired <a href="../www/command-line-options.html#channel">‑channel</a> value. See <a href="../www/command-line-options.html#threshold">‑threshold</a> for more details on thresholds and resulting values.
				614	</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	615
				616
				617	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	618	<h4><a id="blend"></a>-blend <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	619	</div>
				620
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	621	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>blend an image into another by the given absolute value or percent.</td><td style='text-align:right;'>[<a href="../www/composite.html">composite</a>]</td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	622
				623	<p>Blend will average the images together ('plus') according to the
				624	percentages given and each pixels transparency. If only a single percentage
				625	value is given it sets the weight of the composite or 'source' image, while
				626	the background image is weighted by the exact opposite amount. That is a
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	627	<kbd>-blend 30%</kbd> merges 30% of the 'source' image with 70% of the
				628	'destination' image. Thus it is equivalent to <kbd>-blend 30x70%</kbd>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	629
				630
				631	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	632	<h4><a id="blue-primary"></a>-blue-primary <em class="arg">x</em>,<em class="arg">y</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	633	</div>
				634
				635	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the blue chromaticity primary point.</td><td style='text-align:right;'></td></tr></table>
				636
				637	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	638	<h4><a id="blue-shift"></a>-blue-shift <em class="arg">factor</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	639	</div>
				640
				641	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>simulate a scene at nighttime in the moonlight. Start with a factor of 1.5</td><td style='text-align:right;'></td></tr></table>
				642
				643	<div style="margin: auto;">
				644
				645	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	646	<h4><a id="blur"></a>-blur <em class="arg">radius</em><br />-blur <em class="arg">radius</em>x<em class="arg">sigma</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	647	</div>
				648
				649	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Reduce image noise and reduce detail levels.</td><td style='text-align:right;'></td></tr></table>
				650
cristy	b15553d	2010-07-03 22:53:14 +0000	[diff] [blame]	651	<p>Convolve the image with a Gaussian or normal distribution using the given
				652	<em class="arg" >Sigma</em> value. The formula is:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	653
				654	<div class="eqn"><img alt="gaussian distribution" width="243px" height="42px" src="../images/gaussian-blur.png"/>
				655	</div>
				656
cristy	b15553d	2010-07-03 22:53:14 +0000	[diff] [blame]	657	<p>The <em class="arg" >Sigma</em> value is the important argument, and
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	658	determines the actual amount of blurring that will take place. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	659
cristy	b15553d	2010-07-03 22:53:14 +0000	[diff] [blame]	660	<p>The <em class="arg" >Radius</em> is only used to determine the size of the
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	661	array which will hold the calculated Gaussian distribution. It should be an
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	662	integer. If not given, or set to zero, IM will calculate the largest possible
cristy	b15553d	2010-07-03 22:53:14 +0000	[diff] [blame]	663	radius that will provide meaningful results for the Gaussian distribution.
				664	</p>
				665
				666	<p>The larger the <em class="arg" >Radius</em> the radius the slower the
				667	operation is. However too small a <em class="arg" >Radius</em>, and sever
				668	aliasing effects may result. As a guideline, <em class="arg" >Radius</em>
				669	should be at least twice the <em class="arg" >Sigma</em> value, though three
				670	times will produce a more accurite result. </p>
				671
				672	<p>This option differs from <a href="#gaussian-blur">-gaussian-blur</a> simply
				673	by taking advantage of the separability properties of the distribution. Here
				674	we apply a single-dimensional Gaussian matrix in the horizontal direction,
				675	then repeat the process in the vertical direction.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	676
				677	<p>The <a href="#virtual-pixel">-virtual-pixel</a> setting will determine how
				678	pixels which are outside the image proper are blurred into the final result.
				679	</p>
				680
				681
				682	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	683	<h4>-blur <em class="arg">Width</em>[x<em class="arg">Height</em>[+<em class="arg">Angle</em>]]</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	684	</div>
				685
				686	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Variably blur and image according to the overlay mapping.</td><td style='text-align:right;'>[<a href="../www/composite.html">composite</a>]</td></tr></table>
				687
				688	<p>Each pixel in the overlaid region is replaced with an Elliptical Weighted
				689	Average (EWA) of the source image, scaled according to the grayscale
				690	mapping. </p>
				691
				692	<p>The ellipse is weighted with sigma set to the given <em class="arg"
				693	>Width</em> and <em class="arg" >Height</em>. The <em class="arg" >Height</em>
				694	defaults to the <em class="arg" >Width</em> for a normal circular Guassian
				695	weighting. The <em class="arg" >Angle</em> will rotate the ellipse from
				696	horizontal clock-wise. </p>
				697
				698	<p>The <a href="#virtual-pixel">-virtual-pixel</a> setting will determine how
				699	pixels which are outside the image proper are blurred into the final result.
				700	</p>
				701
				702
				703	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	704	<h4><a id="border"></a>-border <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	705	</div>
				706
				707	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Surround the image with a border of color. </td><td style='text-align:right;'></td></tr></table>
				708
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	709	<p>Set the width and height using the <em class="arg">size</em> portion of the
				710	<em class="arg">gravity</em> argument. See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument. Offsets are
				711	ignored. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	712
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	713	<p>Set the border color by preceding with the <a
				714	href="#bordercolor">-bordercolor</a> setting.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	715
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	716	<p>The <a href="#border">-border</a> operation is affected by the current <a
				717	href="#compose">-compose</a> setting and assumes that this is using the default
				718	'<kbd>Over</kbd>' composition method. It generates a image of the appropriate
				719	size colors by the current <a href="#bordercolor">-bordercolor</a> before
				720	overlaying the original image in the center of this net image. This means that
				721	with the default compose method of '<kbd>Over</kbd>' any transparent parts may
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	722	be replaced by the current <a href="#bordercolor">-bordercolor</a> setting.</p>
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	723	<p>See also the <a href="#frame">-frame</a> option, which has more
				724	functionality.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	725
				726	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	727	<h4><a id="bordercolor"></a>-bordercolor <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	728	</div>
				729
				730	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the border color.</td><td style='text-align:right;'></td></tr></table>
				731
				732	<p>The color is specified using the format described under the <a href="#fill">-fill</a> option.</p>
				733
				734	<p>The default border color is <kbd>#DFDFDF</kbd>, <span style="background-color: #dfdfdf;">this shade of gray</span>.</p>
				735
				736	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	737	<h4><a id="borderwidth"></a>-borderwidth <em class="arg">geometry</em> </h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	738	</div>
				739
				740	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the border width.</td><td style='text-align:right;'>[<a href="../www/animate.html">animate</a>, <a href="../www/display.html">display</a>]</td></tr></table>
				741
				742	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	743	<h4><a id="brightness-contrast"></a>-brightness-contrast <em class="arg">brightness</em><br />-brightness-contrast <em class="arg">brightness</em>{x<em class="arg">contrast</em>}{<em class="arg">%</em>}}</h4>
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	744	</div>
				745
				746	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Adjust the brightness and/or contrast of the image.</td><td style='text-align:right;'></td></tr></table>
				747
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	748	<p>Brightness and Contrast values apply changes to the input image. They are
				749	not absolute settings. A brightness or contrast value of zero means no change.
				750	The range of values is -100 to +100 on each. Positive values increase the
				751	brightness or contrast and negative values decrease the brightness or contrast.
				752	To control only contrast, set the brightness=0. To control only brightness,
				753	set contrast=0 or just leave it off.</p>
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	754
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	755	<p>You may also use <a href="#fill">-channel</a> to control which channels to
				756	apply the brightness and/or contrast change. The default is to apply the same
				757	transformation to all channels.</p>
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	758
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	759	<p>Brightness and Contrast arguments are converted to offset and slope of a
				760	linear transform and applied
				761	using <a href="#fill">-function polynomial "slope,offset"</a>.</p>
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	762
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	763	<p>The slope varies from 0 at contrast=-100 to almost vertical at
				764	contrast=+100. For brightness=0 and contrast=-100, the result are totally
				765	midgray. For brightness=0 and contrast=+100, the result will approach but
				766	not quite reach a threshold at midgray; that is the linear transformation
				767	is a very steep vertical line at mid gray.</p>
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	768
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	769	<p>Negative slopes, i.e. negating the image, are not possible with this
				770	function. All achievable slopes are zero or positive.</p>
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	771
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	772	<p>The offset varies from -0.5 at brightness=-100 to 0 at brightness=0 to +0.5
				773	at brightness=+100. Thus, when contrast=0 and brightness=100, the result is
				774	totally white. Similarly, when contrast=0 and brightness=-100, the result is
				775	totally black.</p>
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	776
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	777	<p>As the range of values for the arguments are -100 to +100, adding the '%'
				778	symbol is no different than leaving it off.</p>
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	779
				780	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	781	<h4><a id="cache"></a>-cache <em class="arg">threshold</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	782	</div>
				783
				784	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>(This option has been replaced by the <a href='#limit'>-limit</a> option.)</td><td style='text-align:right;'></td></tr></table>
				785
				786	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	787	<h4><a id="caption"></a>-caption <em class="arg">string</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	788	</div>
				789
				790	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Assign a caption to an image.</td><td style='text-align:right;'></td></tr></table>
				791
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	792	<p>This option sets the caption meta-data of an image read in after this
				793	option has been given. To modify a caption of images already in memory use
				794	"<kbd><a href="#set">-set</a> caption</kbd>". </p>
				795
				796	<p>The caption can contain special format characters listed in the <a
				797	href="../www/escape.html">Format and
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	798	Print Image Properties</a>. These attributes are expanded when the caption
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	799	is finally assigned to the individual images. </p>
				800
				801	<p>If the first character of <em class="arg">string</em> is <em
				802	class="arg">@</em>, the image caption is read from a file titled by the
				803	remaining characters in the string. Comments read in from a file are literal;
				804	no embedded formatting characters are recognized.</p>
				805
				806	<p>Caption meta-data ais not visible on the image itself. To do that use the
				807	<a href="#annotate">-annotate</a> or <a href="#draw">-draw</a> options
				808	instead.</p>
				809
				810	<p>For example,</p>
				811
				812	<p class="crtsnip">
				813	-caption "%m:%f %wx%h" bird.miff
				814	</p>
				815
				816	<p>produces an image caption of <kbd>MIFF:bird.miff 512x480</kbd> (assuming
				817	that the image <kbd>bird.miff</kbd> has a width of 512 and a height of
				818	480.</p>
				819
				820
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	821	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	822	<h4><a id="cdl"></a>-cdl <em class="arg">filename</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	823	</div>
				824
				825	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>color correct with a color decision list.</td><td style='text-align:right;'></td></tr></table>
				826
				827	<p>Here is an example color correction collection:</p>
				828
				829	<pre class="text">
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	830	<?xml version="1.0" encoding="UTF-8"?>
				831	<ColorCorrectionCollection xmlns="urn:ASC:CDL:v1.2">
				832	<ColorCorrection id="cc06668">
				833	<SOPNode>
				834	<Slope> 0.9 1.2 0.5 </Slope>
				835	<Offset> 0.4 -0.5 0.6 </Offset>
				836	<Power> 1.0 0.8 1.5 </Power>
				837	</SOPNode>
				838	<SATNode>
				839	<Saturation> 0.85 </Saturation>
				840	</SATNode>
				841	</ColorCorrection>
				842	</ColorCorrectionCollection>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	843	</pre>
				844
				845	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	846	<h4><a id="channel"></a>-channel <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	847	</div>
				848
				849	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Specify those image color channels to which subsequent operators are limited.</td><td style='text-align:right;'></td></tr></table>
				850
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	851	<p>Choose from: <kbd>Red</kbd>, <kbd>Green</kbd>, <kbd>Blue</kbd>,
				852	<kbd>Alpha</kbd>, <kbd>Cyan</kbd>, <kbd>Magenta</kbd>, <kbd>Yellow</kbd>,
				853	<kbd>Black</kbd>, <kbd>Opacity</kbd>, <kbd>Index</kbd>, <kbd>RGB</kbd>,
				854	<kbd>RGBA</kbd>, <kbd>CMYK</kbd>, or <kbd>CMYKA</kbd>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	855
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	856	<p>The channels above can also be specified as a comma-separated list or can be
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	857	abbreviated as a concatenation of the letters '<kbd>R</kbd>', '<kbd>G</kbd>',
				858	'<kbd>B</kbd>', '<kbd>A</kbd>', '<kbd>O</kbd>', '<kbd>C</kbd>',
				859	'<kbd>M</kbd>', '<kbd>Y</kbd>', '<kbd>K</kbd>'.
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	860
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	861	For example, to only select the <kbd>Red</kbd> and <kbd>Blue</kbd> channels
				862	you can either use </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	863	<p class="crtsnip">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	864	-channel Red,Blue
				865	</p>
				866	<p>or you can use the short hand form</p>
				867	<p class="crtsnip">
				868	-channel RB
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	869	</p>
				870
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	871	<p>All the channels that is present in an image can be specified using the
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	872	special channel type <kbd>All</kbd>. Not all operators are 'channel capable',
				873	but generally any operators that are generally 'grey-scale' image operators,
				874	will understand this setting. See individual operator documentation. </p>
				875
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	876	<br />
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	877
				878	<p>On top of the normal channel selection a extra flag can be specified,
				879	'<kbd>Sync</kbd>'. This is turned on by default and if set means that
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	880	operators that understand this flag should perform: cross-channel
				881	syncronization of the channels. If not specified, then most grey-scale
				882	operators will apply their image processing operations to each individual
				883	channel (as specified by the rest of the <a href="#channel">-channel</a>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	884	setting) completely independently from each other. </p>
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	885
				886	<p>For example for operators such as <a href="#auto-level">-auto-level</a> and
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	887	<a href="#auto-gamma">-auto-gamma</a> the color channels are modified
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	888	together in exactly the same way so that colors will remain in-sync. Without
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	889	it being set, then each channel is modified separately and
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	890	independently, which may produce color distortion. </p>
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	891
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	892	<p>The <a href="#morphology">-morphology</a> '<kbd>Convolve</kbd>' method
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	893	and the <a href="#compose">-compose</a> mathematical methods, also understands
				894	the '<kbd>Sync</kbd>' flag to modify the behaviour of pixel colors according
				895	to the alpha channel (if present). That is to say it will modify the image
				896	processing with the understanding that fully-transparent colors should not
				897	contribute to the final result. </p>
				898
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	899	<p>Basically, by default, operators work with color channels in syncronous, and
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	900	treats transparency as special, unless the <a href="#channel">-channel</a>
				901	setting is modified so as to remove the effect of the '<kbd>Sync</kbd>' flag.
				902	How each operator does this depends on that operators current implementation.
				903	Not all operators understands this flag at this time, but that is changing.
				904	</p>
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	905
				906	<p>To print a complete list of channel types, use <a href="#list">-list
				907	channel</a>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	908
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	909	<br />
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	910
				911	<p>By default, ImageMagick sets <a href="#channel">-channel</a> to the value
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	912	'<kbd>RGBK,sync</kbd>', which specifies that operators act on all color
				913	channels except the transparency channel, and that all the color channels are
				914	to be modified in exactly the same way, with a understanding of transprancy
				915	(depending on the operation being applied). The 'plus' form <a
				916	href="#channel" >+channel</a> will reset the value back to this default. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	917
				918	<p>Options that are affected by the <a href="#channel" >-channel</a> setting
				919	include the following.
				920
				921	<a href="#auto-gamma">-auto-gamma</a>,
				922	<a href="#auto-level">-auto-level</a>,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	923	<a href="#black-threshold">-black-threshold</a>,
				924	<a href="#blur">-blur</a>,
cristy	b4c03bb	2009-09-27 13:55:46 +0000	[diff] [blame]	925	<a href="#clamp">-clamp</a>,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	926	<a href="#clut">-clut</a>,
				927	<a href="#combine">-combine</a>,
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	928	<a href="#composite">-composite</a> (Mathematical compose methods only),
				929	<a href="#convolve">-convolve</a>,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	930	<a href="#contrast-stretch">-contrast-stretch</a>,
				931	<a href="#evaluate">-evaluate</a>,
				932	<a href="#function">-function</a>,
				933	<a href="#fx">-fx</a>,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	934	<a href="#gaussian-blur">-gaussian-blur</a>,
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	935	<a href="#hald-clut">-hald-clut</a>,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	936	<a href="#motion-blur">-motion-blur</a>,
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	937	<a href="#morphology">-morphology</a>,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	938	<a href="#negate">-negate</a>,
				939	<a href="#normalize">-normalize</a>,
				940	<a href="#ordered-dither">-ordered-dither</a>,
				941	<a href="#radial-blur">-radial-blur</a>,
				942	<a href="#random-threshold">-random-threshold</a>,
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	943	<a href="#separate">-separate</a>,
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	944	<a href="#threshold">-threshold</a>, and
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	945	<a href="#white-threshold">-white-threshold</a>.
				946	</p>
				947
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	948	<p>Warning, some operators behave differently when the <a href="#channel"
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	949	>+channel</a> default setting is in effect, verses ANY user defined <a
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	950	href="#channel" >-channel</a> setting (including the equivalent of the
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	951	default). These operators have yet to be made to understand the newer 'Sync'
				952	flag. </p>
				953
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	954	<p>For example <a href="#threshold">-threshold</a> will by default gray-scale
				955	the image before thresholding, if no <a href="#channel" >-channel</a> setting
				956	has been defined. This is not 'Sync flag controlled, yet. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	957
				958	<p>Also some operators such as <a href="#blur">-blur</a>, <a
				959	href="#gaussian-blur">-gaussian-blur</a>, will modify their handling of the
				960	color channels if the '<kbd>alpha</kbd>' channel is also enabled by <a
				961	href="#channel" >-channel</a>. Generally this done to ensure that
				962	fully-transparent colors are treated as being fully-transparent, and thus any
				963	underlying 'hidden' color has no effect on the final results. Typically
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	964	resulting in 'halo' effects. The newer <a href="#morphology">-morphology</a>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	965	convolution equivalents however does have a understanding of the 'Sync' flag
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	966	and will thus handle transparency correctly by default. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	967
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	968	<p>As a alpha channel is optional within images, some operators will read the
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	969	color channels of an image as a greyscale alpha mask, when the image has no
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	970	alpha channel present, and the <a href="#channel" >-channel</a> setting tells
				971	the operator to apply the operation using alpha channels. The <a
				972	href="#clut">-clut</a> operator is a good example of this. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	973
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	974
				975	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	976	<h4><a id="clamp"></a>-clamp</h4>
cristy	b4c03bb	2009-09-27 13:55:46 +0000	[diff] [blame]	977	</div>
				978
				979	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Restrict image colors from 0 to the quantum depth.</td><td style='text-align:right;'></td></tr></table>
				980
				981	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	982	<h4><a id="charcoal"></a>-charcoal <em class="arg">factor</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	983	</div>
				984
				985	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Simulate a charcoal drawing.</td><td style='text-align:right;'></td></tr></table>
				986
				987	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	988	<h4><a id="chop"></a>-chop <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	989	</div>
				990
				991	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Remove pixels from the interior of an image.</td><td style='text-align:right;'></td></tr></table>
				992
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	993	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument. The <em class="arg">width</em>
				994	and <em class="arg">height</em> given in the of the <em class="arg">size</em>
				995	portion of the <em class="arg">geometry</em> argument give the number of
				996	columns and rows to remove. The <em class="arg">offset</em> portion of
				997	the <em class="arg">geometry</em> argument is influenced by
				998	a <a href="#gravity">-gravity</a> setting, if present.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	999
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1000	<p>The <a href="#chop">-chop</a> option removes entire rows and columns,
				1001	and moves the remaining corner blocks leftward and upward to close the gaps.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1002
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1003	<p>While it can remove internal rows and columns of pixels, it is more typically
				1004	used with as <a href="#gravity">-gravity</a> setting and a '<kbd>+0+0</kbd>' offset
				1005	so as to remove a single edge from an image. Compare this to <a href="#shave"
				1006	>-shave</a> whcih removes equal numbers of pixels from oppisite sides of the image.
				1007	</p>
				1008
				1009	<p>Using <a href="#chop">-chop</a> will effectivally undo the results of a
				1010	<a href="#splice">-splice</a> that was given the same <em class="arg">geometry</em>
				1011	and <a href="#gravity">-gravity</a> settings. </p>
				1012
				1013
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1014	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1015	<h4><a id="clip"></a>-clip</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1016	</div>
				1017
				1018	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Apply the clipping path if one is present.</td><td style='text-align:right;'></td></tr></table>
				1019
				1020	<p>If a clipping path is present, it is applied to subsequent operations.</p>
				1021
				1022	<p>For example, in the command</p>
				1023
				1024	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert -clip -negate cockatoo.tif negated.tif</span></p>
				1025	<p>only the pixels within the clipping path are negated.</p>
				1026
				1027	<p>The <a href="#clip">-clip</a> feature requires the XML library. If the XML library is not present, the option is ignored.</p>
				1028
				1029	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1030	<h4><a id="clip-mask"></a>-clip-mask</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1031	</div>
				1032
				1033	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Clip the image as defined by this mask.</td><td style='text-align:right;'></td></tr></table>
				1034
				1035	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1036	<h4><a id="clip-path"></a>-clip-path <em class="arg">id</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1037	</div>
				1038
				1039	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Clip along a named path from the 8BImageMagick profile.</td><td style='text-align:right;'></td></tr></table>
				1040
				1041	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1042	<h4><a id="clone"></a>-clone <em class="arg">index(s)</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1043	</div>
				1044
				1045	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Make a copy of an image (or images).</td><td style='text-align:right;'></td></tr></table>
				1046
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1047	<p>Inside parenthesis (where the operator is normally used) it will make a
				1048	clone of the images from the last 'pushed' image sequence, and adds them to
				1049	the end of the current image sequence. Outside parenthesis
				1050	(not recommended) it clones the images from the current image sequence. </p>
				1051
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1052	<p>Specify the image by its index in the sequence. The first image is index
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1053	0. Negative indexes are relative to the end of the sequence; for
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1054	example, <kbd>−1</kbd>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1055	represents the last image of the sequence. Specify a range of images with a
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1056	dash (e.g. <kbd>0−4</kbd>). Separate multiple indexes with commas but no
				1057	spaces (e.g. <kbd>0,2,5</kbd>). A value of '<kbd>0−−1</kbd> will
				1058	effectivally clone all the images. </p>
				1059
				1060	<p>The <a href="#clone">+clone</a> will simply make a copy of the last image
				1061	in the image sequence, and is thus equivelent to using a argument of
				1062	'<kbd>−1</kbd>'. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1063
				1064	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1065	<h4><a id="clut"></a>-clut</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1066	</div>
				1067
				1068	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Replace the channel values in the first image using each
				1069	corresponding channel in the second image as a <b>c</b>olor
				1070	<b>l</b>ook<b>u</b>p <b>t</b>able.</td><td style='text-align:right;'></td></tr></table>
				1071
				1072	<p>The second (LUT) image is ordinarily a gradient image containing the
				1073	histogram mapping of how each channel should be modified. Typically it is a
				1074	either a single row or column image of replacement color values. If larger
				1075	than a single row or column, values are taken from a diagonal line from
				1076	top-left to bottom-right corners.</p>
				1077
				1078	<p>The lookup is further controlled by the <a
				1079	href="#interpolate">-interpolate</a> setting, which is especially handy for an
				1080	LUT which is not the full length needed by the ImageMagick installed Quality
				1081	(Q) level. Good settings for this are the '<kbd>bilinear</kbd>' and
				1082	'<kbd>bicubic</kbd>' interpolation settings, which give smooth color
				1083	gradients, and the '<kbd>integer</kbd>' setting for a direct, unsmoothed
				1084	lookup of color values. </p>
				1085
				1086	<p>This operator is especially suited to replacing a grayscale image with a
				1087	specific color gradient from the CLUT image. </p>
				1088
				1089	<p>Only the channel values defined by the <a href="#channel">-channel</a>
				1090	setting will have their values replaced. In particular, since the default <a
				1091	href="#channel">-channel</a> setting is <kbd>RGB</kbd>, this means that
				1092	transparency (alpha/matte channel) is not affected, unless the <a
				1093	href="#channel">-channel</a> setting is modified. When the alpha channel is
				1094	set, it is treated by the <a href="#clut" >-clut</a> operator in the same way
				1095	as the other channels, implying that alpha/matte values are replaced using the
				1096	alpha/matte values of the original image. </p>
				1097
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1098	<p>If either the image being modified, or the lookup image, contains no
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1099	transparency (i.e. <a href="#alpha" >-alpha</a> is turned 'off') but the <a
				1100	href="#channel">-channel</a> setting includes alpha replacement, then it is
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1101	assumed that image represents a gray-scale gradient which is used for the
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1102	replacement alpha values. That is you can use a gray-scale CLUT image to
				1103	adjust a existing images alpha channel, or you can color a gray-scale image
				1104	using colors form CLUT containing the desired colors, including transparency.
				1105	</p>
				1106
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1107	<p>See also <a href="#hald-clut" >-hald-clut</a> which replaces colors
				1108	according to the lookup of the full color RGB value from a 2D representation
				1109	of a 3D color cube. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1110
				1111
				1112	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1113	<h4><a id="coalesce"></a>-coalesce</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1114	</div>
				1115
				1116	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Fully define the look of each frame of an GIF animation sequence, to form a 'film strip' animation.</td><td style='text-align:right;'></td></tr></table>
				1117
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1118	<p>Overlay each image in an image sequence according to
				1119	its <a href="#dispose">-dispose</a> meta-data, to reproduce the look of
				1120	an animation at each point in the animation sequence. All images should be
				1121	the same size, and are assigned appropriate GIF disposal settings for the
				1122	animation to continue working as expected as a GIF animation. Such frames
				1123	are more easily viewed and processed than the highly optimized GIF overlay
				1124	images. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1125
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1126	<p>The animation can be re-optimized after processing using
				1127	the <a href="#layers">-layers</a> method '<kbd>optimize</kbd>', although
				1128	there is no guarantee that the restored GIF animation optimization is
				1129	better than the original. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1130
				1131
				1132	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1133	<h4><a id="colorize"></a>-colorize <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1134	</div>
				1135
				1136	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Colorize the image by an amount specified by <em class="arg">value</em> using the color specified by the most recent <a href="#fill" >-fill</a> setting.</td><td style='text-align:right;'></td></tr></table>
				1137
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1138	<p>Specify the amount of colorization as a percentage. Separate colorization
				1139	values can be applied to the red, green, and blue channels of the image with
				1140	a comma-delimited list of colorization
				1141	values (e.g., <kbd>-colorize 0,0,50</kbd>).</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1142
				1143	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1144	<h4><a id="colormap"></a>-colormap <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1145	</div>
				1146
				1147	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Define the colormap type.</td><td style='text-align:right;'>[<a href="../www/animate.html">animate</a>, <a href="../www/display.html">display</a>]</td></tr></table>
				1148
				1149	<p>The <em class="arg">type</em> can be <kbd>shared</kbd> or <kbd>private</kbd>.</p>
				1150
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1151	<p>This option only applies when the default X server visual
				1152	is <kbd>PseudoColor</kbd> or <kbd>GrayScale</kbd>. Refer
				1153	to <a href="#visual">-visual</a> for more details. By default,
				1154	a shared colormap is allocated. The image shares colors with
				1155	other X clients. Some image colors could be approximated,
				1156	therefore your image may look very different than intended.
				1157	If <kbd>private</kbd> is chosen, the image colors appear exactly
				1158	as they are defined. However, other clients may go <em>technicolor</em>
				1159	when the image colormap is installed.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1160
				1161	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1162	<h4><a id="colors"></a>-colors <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1163	</div>
				1164
				1165	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the preferred number of colors in the image.</td><td style='text-align:right;'></td></tr></table>
				1166
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1167	<p>The actual number of colors in the image may be less than your request,
				1168	but never more. Note that this a color reduction option. Images with fewer
				1169	unique colors than specified by <em class="arg">value</em> will have any
				1170	duplicate or unused colors removed. The ordering of an existing color
				1171	palette may be altered. When converting an image from color to grayscale,
				1172	it is more efficient to convert the image to the gray colorspace before
				1173	reducing the number of colors. Refer to
				1174	the <a href="../www/quantize.html">
				1175	color reduction algorithm</a> for more details.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1176
				1177	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1178	<h4><a id="color-matrix"></a>-color-matrix <em class="arg">matrix</em></h4>
cristy	2c83960	2010-04-03 02:32:08 +0000	[diff] [blame]	1179	</div>
				1180
				1181	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>apply color correction to the image.</td><td style='text-align:right;'></td></tr></table>
				1182
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1183	<p>This option permits saturation changes, hue rotation, luminance to alpha,
				1184	and various other effects. Although variable-sized transformation matrices
				1185	can be used, typically one uses a 5x5 matrix for an RGBA image and a 6x6
				1186	for CMYKA (or RGBA with offsets). The matrix is similar to those used by
				1187	Adobe Flash except offsets are in column 6 rather than 5 (in support of
				1188	CMYKA images) and offsets are normalized (divide Flash offset by 255).</p>
cristy	2c83960	2010-04-03 02:32:08 +0000	[diff] [blame]	1189
				1190	<p>As an example, to add contrast to an image with offsets, try this command:</p>
				1191
				1192	<pre class="text">
				1193	convert kittens.jpg -color-matrix \
				1194	" 1.5 0.0 0.0 0.0, 0.0, -0.157 \
				1195	0.0 1.5 0.0 0.0, 0.0, -0.157 \
				1196	0.0 0.0 1.5 0.0, 0.0, -0.157 \
				1197	0.0 0.0 0.0 1.0, 0.0, 0.0 \
				1198	0.0 0.0 0.0 0.0, 1.0, 0.0 \
				1199	0.0 0.0 0.0 0.0, 0.0, 1.0" kittens.png
				1200	</pre>
				1201	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1202	<h4><a id="colorspace"></a>-colorspace <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1203	</div>
				1204
				1205	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the image colorspace.</td><td style='text-align:right;'></td></tr></table>
				1206
				1207	<p>Choices are:</p>
				1208
				1209	<pre class="text">
				1210	CMY
				1211	CMYK
				1212	Gray
				1213	HSB
				1214	HSL
				1215	HWB
				1216	Lab
				1217	Log
				1218	OHTA
				1219	Rec601Luma
				1220	Rec601YCbCr
				1221	Rec709Luma
				1222	Rec709YCbCr
				1223	RGB
				1224	sRGB
				1225	Transparent
				1226	XYZ
				1227	YCbCr
				1228	YCC
				1229	YIQ
				1230	YPbPr
				1231	YUV
				1232	</pre>
				1233
				1234	<p>To print a complete list of colorspaces, use <a href="#list">-list colorspace</a>.</p>
				1235
				1236	<p>For a more accurate color conversion to or from the RGB, CMYK, or grayscale colorspaces, use the <a href="#profile">-profile</a> option.</p>
				1237
				1238	<table class="doc">
				1239	<caption>Conversion Of RGB To Other Color Spaces</caption>
				1240	<tr><th align="left" valign="middle">CMY</th></tr>
				1241	<tr><td align="left" valign="middle">C=<em class="QR">QuantumRange</em>−R</td></tr>
				1242	<tr><td align="left" valign="middle">M=<em class="QR">QuantumRange</em>−G</td></tr>
				1243	<tr><td align="left" valign="middle">Y=<em class="QR">QuantumRange</em>−B</td></tr>
				1244	<tr><th align="left" valign="middle">CMYK — starts with CMY from above</th></tr>
				1245	<tr><td align="left" valign="middle">K=min(C,Y,M)</td></tr>
				1246	<tr><td align="left" valign="middle">C=<em class="QR">QuantumRange</em>*(C−K)/(<em class="QR">QuantumRange</em>−K)</td></tr>
				1247	<tr><td align="left" valign="middle">M=<em class="QR">QuantumRange</em>*(M−K)/(<em class="QR">QuantumRange</em>−K)</td></tr>
				1248	<tr><td align="left" valign="middle">Y=<em class="QR">QuantumRange</em>*(Y−K)/(<em class="QR">QuantumRange</em>−K)</td></tr>
				1249
				1250	<tr><th align="left" valign="middle">Gray</th></tr>
				1251	<tr><td align="left" valign="middle">Gray = 0.29900R+0.58700G+0.11400*B</td></tr>
				1252
				1253	<tr><th align="left" valign="middle">HSB — Hue, Saturation, Brightness; like a cone peak downward</th></tr>
				1254	<tr><td align="left" valign="middle">H=angle around perimeter (0 to 360 deg); H=0 is red; increasing angles toward green</td></tr>
				1255	<tr><td align="left" valign="middle">S=distance from axis outward</td></tr>
				1256	<tr><td align="left" valign="middle">B=distance along axis from bottom upward; B=max(R,G,B); <em>intensity-like</em></td></tr>
				1257
				1258	<tr><th align="left" valign="middle">HSL — Hue, Saturation, Lightness; like a double cone end-to-end with peaks at very top and bottom</th></tr>
				1259	<tr><td align="left" valign="middle">H=angle around perimeter (0 to 360 deg); H=0 is red; increasing angles toward green</td></tr>
				1260	<tr><td align="left" valign="middle">S=distance from axis outward</td></tr>
				1261	<tr><td align="left" valign="middle">L=distance along axis from bottom upward; L=0.5max(R,G,B) + 0.5min(R,G,B); <em>intensity-like</em></td></tr>
				1262
				1263	<tr><th align="left" valign="middle">HWB — Hue, Whiteness, Blackness</th></tr>
				1264	<tr><td align="left" valign="middle">Hue (complicated equation)</td></tr>
				1265	<tr><td align="left" valign="middle">Whiteness (complicated equation)</td></tr>
				1266	<tr><td align="left" valign="middle">Blackness (complicated equation)</td></tr>
				1267
				1268	<tr><th align="left" valign="middle">LAB</th></tr>
				1269	<tr><td align="left" valign="middle">L (complicated equation relating X,Y,Z)</td></tr>
				1270	<tr><td align="left" valign="middle">A (complicated equation relating X,Y,Z)</td></tr>
				1271	<tr><td align="left" valign="middle">B (complicated equation relating X,Y,Z)</td></tr>
				1272
				1273	<tr><th align="left" valign="middle">LOG</th></tr>
				1274	<tr><td align="left" valign="middle">I1 (complicated equation involving logarithm of R)</td></tr>
				1275	<tr><td align="left" valign="middle">I2 (complicated equation involving logarithm of G)</td></tr>
				1276	<tr><td align="left" valign="middle">I3 (complicated equation involving logarithm of B)</td></tr>
				1277
				1278	<tr><th align="left" valign="middle">OHTA — approximates principal components transformation</th></tr>
				1279	<tr><td align="left" valign="middle">I1=0.33333R+0.33334G+0.33333*B; <em>intensity-like</em></td></tr>
				1280	<tr><td align="left" valign="middle">I2=(0.50000R+0.00000G−0.50000B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1281	<tr><td align="left" valign="middle">I3=(−0.25000R+0.50000G−0.25000B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1282
				1283	<tr><th align="left" valign="middle">Rec601Luma</th></tr>
				1284	<tr><td align="left" valign="middle">Gray = 0.29900R+0.58700G+0.11400*B</td></tr>
				1285
				1286	<tr><th align="left" valign="middle">Rec601YCbCr</th></tr>
				1287	<tr><td align="left" valign="middle">Y=0.299000R+0.587000G+0.114000*B; <em>intensity-like</em></td></tr>
				1288	<tr><td align="left" valign="middle">Cb=(−0.168736R-0.331264G+0.500000B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1289	<tr><td align="left" valign="middle">Cr=(0.500000R−0.418688G−0.081312B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1290
				1291	<tr><th align="left" valign="middle">Rec709Luma</th></tr>
				1292	<tr><td align="left" valign="middle">Gray=0.21260R+0.71520G+0.07220*B</td></tr>
				1293
				1294	<tr><th align="left" valign="middle">Rec709YCbCr</th></tr>
				1295	<tr><td align="left" valign="middle">Y=0.212600R+0.715200G+0.072200*B; <em>intensity-like</em></td></tr>
				1296	<tr><td align="left" valign="middle">Cb=(−0.114572R−0.385428G+0.500000B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1297	<tr><td align="left" valign="middle">Cr=(0.500000R−0.454153G−0.045847B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1298
				1299	<tr><th align="left" valign="middle">sRGB</th></tr>
				1300	<tr><td align="left" valign="middle">if Rs ≤ .03928 then Rs=R/12.92 else Rs=((R+.055)/1.055)^2.4</td></tr>
				1301	<tr><td align="left" valign="middle">if Gs ≤ .03928 then Gs=B/12.92 else Gs=((G+.055)/1.055)^2.4</td></tr>
				1302	<tr><td align="left" valign="middle">if Bs ≤ .03928 then Bs=B/12.92 else Bs=((B+.055)/1.055)^2.4</td></tr>
				1303
				1304	<tr><th align="left" valign="middle">XYZ</th></tr>
				1305	<tr><td align="left" valign="middle">X=0.4124240R+0.3575790G+0.1804640*B</td></tr>
				1306	<tr><td align="left" valign="middle">Y=0.2126560R+0.7151580G+0.0721856*B</td></tr>
				1307	<tr><td align="left" valign="middle">Z=0.0193324R+0.1191930G+0.9504440*B</td></tr>
				1308
				1309	<tr><th align="left" valign="middle">YCC</th></tr>
				1310	<tr><td align="left" valign="middle">Y=(0.29900R+0.58700G+0.11400*B) (with complicated scaling); <em>intensity-like</em></td></tr>
				1311	<tr><td align="left" valign="middle">C1=(−0.29900R−0.58700G+0.88600*B) (with complicated scaling)</td></tr>
				1312	<tr><td align="left" valign="middle">C2=(0.70100R−0.58700G−0.11400*B) (with complicated scaling)</td></tr>
				1313
				1314	<tr><th align="left" valign="middle">YCbCr</th></tr>
				1315	<tr><td align="left" valign="middle">Y=0.299000R+0.587000G+0.114000*B; <em>intensity-like</em></td></tr>
				1316	<tr><td align="left" valign="middle">Cb=(−0.168736R−0.331264G+0.500000B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1317	<tr><td align="left" valign="middle">Cr=(0.500000R−0.418688G−0.081312B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1318
				1319	<tr><th align="left" valign="middle">YIQ</th></tr>
				1320	<tr><td align="left" valign="middle">Y=0.29900R+0.58700G+0.11400*B; <em>intensity-like</em></td></tr>
				1321	<tr><td align="left" valign="middle">I=(0.59600R−0.27400G−0.32200B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1322	<tr><td align="left" valign="middle">Q=(0.21100R−0.52300G+0.31200B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1323
				1324	<tr><th align="left" valign="middle">YPbPr</th></tr>
				1325	<tr><td align="left" valign="middle">Y=0.299000R+0.587000G+0.114000*B; <em>intensity-like</em></td></tr>
				1326	<tr><td align="left" valign="middle">Pb=(−0.168736R−0.331264G+0.500000B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1327	<tr><td align="left" valign="middle">Pr=(0.500000R−0.418688G−0.081312B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1328
				1329	<tr><th align="left" valign="middle">YUV</th></tr>
				1330	<tr><td align="left" valign="middle">Y=0.29900R+0.58700G+0.11400*B; <em>intensity-like</em></td></tr>
				1331	<tr><td align="left" valign="middle">U=(−0.14740R−0.28950G+0.43690B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1332	<tr><td align="left" valign="middle">V=(0.61500R−0.51500G−0.10000B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1333	</table>
				1334
				1335	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1336	<h4><a id="combine"></a>-combine</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1337	</div>
				1338
				1339	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Combine one or more images into a single image.</td><td style='text-align:right;'></td></tr></table>
				1340
				1341	<p>The channels (previously set by <a href="#channel">-channel</a>) of the combined image are taken from the grayscale values of each image in the sequence, in order. For the default -channel setting of <kbd>RGB</kbd>, this means the first image is assigned to the <kbd>Red</kbd> channel, the second to the <kbd>Green</kbd> channel, the third to the <kbd>Blue</kbd>.</p>
				1342
				1343	<p>This option can be thought of as the inverse to <a href="#separate">-separate</a>, so long as the channel settings are the same. Thus, in the following example, the final image should be a copy of the original.
				1344	</p>
				1345
cristy	4949d52	2010-03-12 18:41:34 +0000	[diff] [blame]	1346	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert original.png -channel RGB -separate sepimage.png</span><span class='crtout'></span><span class="crtprompt"> $magick> </span><span class='crtin'>convert sepimage-0.png sepimage-1.png sepimage-2.png -channel RGB \ <br/> -combine imagecopy.png</span></p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1347	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1348	<h4><a id="comment"></a>-comment <em class="arg">string</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1349	</div>
				1350
				1351	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Embed a comment in an image.</td><td style='text-align:right;'></td></tr></table>
				1352
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1353	<p>This option sets the comment meta-data of an image read in after this
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	1354	option has been given. To modify a comment of images already in memory use
				1355	"<kbd><a href="#set">-set</a> comment</kbd>". </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1356
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	1357	<p>The comment can contain special format characters listed in the <a
				1358	href="../www/escape.html">Format and
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1359	Print Image Properties</a>. These attributes are expanded when the comment
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	1360	is finally assigned to the individual images. </p>
				1361
				1362	<p>If the first character of <em class="arg">string</em> is <em
				1363	class="arg">@</em>, the image comment is read from a file titled by the
				1364	remaining characters in the string. Comments read in from a file are literal;
				1365	no embedded formatting characters are recognized.</p>
				1366
				1367	<p>Comment meta-data are not visible on the image itself. To do that use the
				1368	<a href="#annotate">-annotate</a> or <a href="#draw">-draw</a> options
				1369	instead.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1370
				1371	<p>For example,</p>
				1372
				1373	<p class="crtsnip">
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	1374	-comment "%m:%f %wx%h" bird.miff
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1375	</p>
				1376
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	1377	<p>produces an image comment of <kbd>MIFF:bird.miff 512x480</kbd> (assuming
				1378	that the image <kbd>bird.miff</kbd> has a width of 512 and a height of
				1379	480.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1380
				1381	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1382	<h4><a id="compose"></a>-compose <em class="arg">operator</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1383	</div>
				1384
				1385	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the type of image composition.</td><td style='text-align:right;'></td></tr></table>
				1386
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	1387	<p>See <a href="../www/compose.html">Alpha Compositing</a> for
				1388	a detailed discussion of alpha compositing.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1389
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	1390	<p>This setting effects image processing operators that merge two (or more)
				1391	images together in some way. This includes the operators,
				1392	<a href="#composite">-composite</a>,
				1393	<a href="#layers">-layers</a> composite,
				1394	<a href="#flatten">-flatten</a>,
				1395	<a href="#mosaic">-mosaic</a>,
				1396	<a href="#layers">-layers</a> merge,
				1397	<a href="#border">-border</a>,
				1398	<a href="#frame">-frame</a>,
				1399	and <a href="#extent">-extent</a>. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1400
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	1401	<p>It is also one of the primary options for the "<kbd>composite</kbd>"
				1402	command. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1403
				1404
				1405	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1406	<h4><a id="composite"></a>-composite</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1407	</div>
				1408
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	1409	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Perform alpha composition on two images and an optional mask</td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1410
				1411	<p>Take the first image 'destination' and overlay the second 'source' image
				1412	according to the current <a href="#compose">-compose</a> setting. The location
				1413	of the 'source' or 'overlay' image is controlled according to <a
				1414	href="#geometry" >-geometry</a>, and <a href="#geometry" >-geometry</a>
				1415	settings. </p>
				1416
				1417	<p>If a third image is given this is treated as a gray-scale 'mask' image
				1418	relative to the first 'destination' image. This mask will limit what parts of
				1419	the destination can be modified by the image composition. However for the
				1420	'<kbd>displace</kbd>' compose method, the mask is used to provide a separate
				1421	Y-displacement image instead. </p>
				1422
				1423	<p>If a <a href="#compose">-compose</a> method requires extra numerical
				1424	arguments or flags these can be provided by setting the <a
				1425	href="#set">-set</a> '<kbd class="arg">option:compose:args</kbd>'
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1426	appropriately for the compose method. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1427
				1428	<p>Some <a href="#compose">-compose</a> methods can modify the 'destination'
				1429	image outside the overlay area. You can disable this by setting the special <a
				1430	href="#set">-set</a> '<kbd class="arg">option:compose:outside-overlay</kbd>'
				1431	to '<kbd>false</kbd>'. </p>
				1432
				1433
				1434	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1435	<h4><a id="compress"></a>-compress <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1436	</div>
				1437
				1438	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Use pixel compression specified by <em class="arg">type</em> when writing the image.</td><td style='text-align:right;'></td></tr></table>
				1439
				1440	<p>Choices are: <kbd class="arg">None</kbd>, <kbd class="arg">BZip</kbd>, <kbd class="arg">Fax</kbd>, <kbd class="arg">Group4</kbd>, <kbd class="arg">JPEG</kbd>, <kbd class="arg">JPEG2000</kbd>, <kbd class="arg">Lossless</kbd>, <kbd class="arg">LZW</kbd>, <kbd class="arg">RLE</kbd> or <kbd class="arg">Zip</kbd>.</p>
				1441
				1442	<p>To print a complete list of compression types, use <a href="#list">-list compress</a>.</p>
				1443
				1444	<p>Specify <a href="#compress">+compress</a> to store the binary image in an uncompressed format. The default is the compression type of the specified image file.</p>
				1445
				1446	<p>If <kbd>LZW</kbd> compression is specified but LZW compression has not been enabled, the image data is written in an uncompressed LZW format that can be read by LZW decoders. This may result in larger-than-expected GIF files.</p>
				1447
				1448	<p><kbd>Lossless</kbd> refers to lossless JPEG, which is only available if the JPEG library has been patched to support it. Use of lossless JPEG is generally not recommended.</p>
				1449
				1450	<p>Use the <a href="#quality">-quality</a> option to set the compression level to be used by JPEG, PNG, MIFF, and MPEG encoders. Use the <a href="#sampling-factor">-sampling-factor</a> option to set the sampling factor to be used by JPEG, MPEG, and YUV encoders for down-sampling the chroma channels.</p>
				1451
				1452	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1453	<h4><a id="contrast"></a>-contrast</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1454	</div>
				1455
				1456	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Enhance or reduce the image contrast.</td><td style='text-align:right;'></td></tr></table>
				1457
				1458	<p>This option enhances the intensity differences between the lighter and darker elements of the image. Use <a href="#contrast">-contrast</a> to enhance the image or <a href="#contrast">+contrast</a> to reduce the image contrast.</p>
				1459
				1460	<p>For a more pronounced effect you can repeat the option:</p>
				1461
				1462	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert rose: -contrast -contrast rose_c2.png</span></p>
				1463	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1464	<h4><a id="contrast-stretch"></a>-contrast-stretch <em class="arg">black-point</em><br />-contrast-stretch <em class="arg">black-point</em>{x<em class="arg">white-point</em>}{<em class="arg">%</em>}}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1465	</div>
				1466
				1467	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Increase the contrast in an image by <em>stretching</em> the range of intensity values.</td><td style='text-align:right;'></td></tr></table>
				1468
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1469	<p>While performing the stretch, black-out at most <em
				1470	class="arg" >black-point</em> pixels and white-out at most <em
				1471	class="arg" >white-point</em> pixels. Or, if percent is used, black-out at most
				1472	<em class="arg" >black-point %</em> pixels and white-out at most <em
				1473	class="arg" >white-point %</em> pixels.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1474
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1475	<p>Prior to ImageMagick 6.4.7-0, <a href="#contrast-stretch"
				1476	>-contrast-stretch</a> will black-out at most <em class="arg"
				1477	>black-point</em> pixels and white-out at most <em class="arg" >total pixels
				1478	minus white-point</em> pixels. Or, if percent is used, black-out at most <em
				1479	class="arg">black-point %</em> pixels and white-out at most <em class="arg"
				1480	>100% minus white-point %</em> pixels.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1481
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1482	<p>Note that <kbd>-contrast-stretch 0</kbd> will modify the image such that
				1483	the image's min and max values are stretched to 0 and <em class="QR"
				1484	>QuantumRange</em>, respectively, without any loss of data due to burn-out or
				1485	clipping at either end. This is not the same as <a href="#normalize"
cristy	d4d64ed	2010-08-22 22:19:33 +0000	[diff] [blame]	1486	>-normalize</a>, which is equivalent to <kbd>-contrast-stretch 0.15x0.05%</kbd> (or
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1487	prior to ImageMagick 6.4.7-0, <kbd>-contrast-stretch 2%x99%</kbd>).</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1488
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1489	<p>Internally operator works by creating a histogram bin, and then uses that
				1490	bin to modify the image. As such some colors may be merged together when they
				1491	originally fell into the same 'bin'. </p>
				1492
				1493	<p>All the channels are normalized in concert by the came amount so as to
				1494	preserve color integrity, when the default <a href="#channel" >+channel</a>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1495	setting is in use. Specifying any other <a href="#channel" >-channel</a>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1496	setting will normalize the RGB channels independently.</p>
				1497
				1498	<p>See also <a href="#auto-level" >-auto-level</a> for a 'perfect'
				1499	normalization of mathematical images. </p>
				1500
				1501	<p>This operator is under review for re-development. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1502
				1503
				1504	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1505	<h4><a id="convolve"></a>-convolve <em class="arg">kernel</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1506	</div>
				1507
				1508	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Convolve an image with a user-supplied convolution kernel.</td><td style='text-align:right;'></td></tr></table>
				1509
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	1510	<p>The <em class="arg">kernel</em> is a matrix specified as
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1511	a comma-separated list of integers (with no spaces), ordered left-to right,
				1512	starting with the top row. Presently, only odd-dimensioned kernels are
				1513	supported, and therefore the number of entries in the specified <em
				1514	class="arg">kernel</em> must be 3<sup>2</sup>=9, 5<sup>2</sup>=25,
				1515	7<sup>2</sup>=49, etc. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1516
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1517	<p>Note that the <a href="../www/command-line-options.html#convolve">‑convolve</a> operator supports the <a href="../www/command-line-options.html#bias">‑bias</a> setting. This option shifts the convolution so that
				1518	positive and negative results are relative to a user-specified bias value.
				1519	This is important for non-HDRI compilations of ImageMagick when dealing with
				1520	convolutions that contain negative as well as positive values. This is
				1521	especially the case with convolutions involving high pass filters or edge
				1522	detection. Without an output bias, the negative values is clipped at zero.
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1523	</p>
				1524
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1525	<p>When using an ImageMagick with the HDRI compile-time setting, <a href="../www/command-line-options.html#bias">‑bias</a> is not needed, as ImageMagick is able to store/handle any
				1526	negative results without clipping to the color value range (0..QuantumRange).
				1527	See the discussion on HDRI implementations of ImageMagick on the page <a
				1528	href="/www/high-dynamic-range.html">High
				1529	Dynamic-Range Images</a>. For more about HDRI go the ImageMagick <a
				1530	href="http://www.imagemagick.org/Usage/basics/#hdri">Usage</a> pages or this
				1531	<a href="http://en.wikipedia.org/wiki/High_dynamic_range_imaging">Wikipedia</a>
				1532	entry. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1533
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1534
				1535	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1536	<h4><a id="crop"></a>-crop <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1537	</div>
				1538
				1539	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Cut out one or more rectangular regions of the image.</td><td style='text-align:right;'></td></tr></table>
				1540
				1541	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				1542
				1543	<p>The <em class="arg">width</em> and <em class="arg">height</em> of the <em class="arg">geometry</em> argument give the size of the image that remains after cropping, and <em class="arg">x</em> and <em class="arg">y</em> in the <em class="arg">offset</em> (if present) gives the location of the top left corner of the cropped image with respect to the original image. To specify the amount to be removed, use <a href="#shave">-shave</a> instead.</p>
				1544
				1545	<p>If the <em class="arg">x</em> and <em class="arg">y</em> offsets are present, a single image is generated, consisting of the pixels from the cropping region. The offsets specify the location of the upper left corner of the cropping region measured downward and rightward with respect to the upper left corner of the image. If the <a href="#gravity">-gravity</a> option is present with <kbd>NorthEast</kbd>, <kbd>East</kbd>, or <kbd>SouthEast</kbd> gravity, it gives the distance leftward from the right edge of the image to the right edge of the cropping region. Similarly, if the <a href="#gravity">-gravity</a> option is present with <kbd>SouthWest</kbd>, <kbd>South</kbd>, or <kbd>SouthEast</kbd> gravity, the distance is measured upward between the bottom edges.</p>
				1546
				1547	<p>If the <em class="arg">x</em> and <em class="arg">y</em> offsets are omitted, a set of tiles of the specified geometry, covering the entire input image, is generated. The rightmost tiles and the bottom tiles are smaller if the specified geometry extends beyond the dimensions of the input image.</p>
				1548
				1549	<p>By adding a exclamation character flag to the geometry argument, the
				1550	cropped images virtual canvas page size and offset is set as if the
				1551	geometry argument was a viewport or window. This means the canvas page size
				1552	is set to exactly the same size you specified, the image offset set
				1553	relative top left corner of the region cropped. </p>
				1554
				1555	<p>If the cropped image 'missed' the actual image on its virtual canvas, a
				1556	special single pixel transparent 'missed' image is returned, and a 'crop
				1557	missed' warning given. </p>
				1558
cristy	739df91	2009-10-24 16:10:18 +0000	[diff] [blame]	1559	<p>It might be necessary to <a href="#repage" >+repage</a> the image prior to cropping the image to ensure the crop coordinate frame is relocated to the upper-left corner of the visible image.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1560
				1561	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1562	<h4><a id="cycle"></a>-cycle <em class="arg">amount</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1563	</div>
				1564
				1565	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>displace image colormap by amount.</td><td style='text-align:right;'></td></tr></table>
				1566
				1567	<p><em class="arg">Amount</em> defines the number of positions each
				1568	colormap entry is shifted.</p>
				1569
				1570
				1571	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1572	<h4><a id="debug"></a>-debug <em class="arg">events</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1573	</div>
				1574
				1575	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>enable debug printout.</td><td style='text-align:right;'></td></tr></table>
				1576
				1577	<p>The <kbd>events</kbd> parameter specifies which events are to be logged. It can be either <kbd>None</kbd>, <kbd>All</kbd>, <kbd>Trace</kbd>, or a comma-separated list consisting of one or more of the following domains: <kbd>Annotate</kbd>, <kbd>Blob</kbd>, <kbd>Cache</kbd>, <kbd>Coder</kbd>, <kbd>Configure</kbd>, <kbd>Deprecate</kbd>, <kbd>Exception</kbd>, <kbd>Locale</kbd>, <kbd>Render</kbd>, <kbd>Resource</kbd>, <kbd>Security</kbd>, <kbd>TemporaryFile</kbd>, <kbd>Transform</kbd>, <kbd>X11</kbd>, or <kbd>User</kbd>. </p>
				1578
				1579
				1580	<p>For example, to log cache and blob events, use.</p>
				1581
				1582	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert -debug "Cache,Blob" rose: rose.png</span></p>
				1583	<p>The <kbd>User</kbd> domain is normally empty, but developers can log user events in their private copy of ImageMagick.</p>
				1584
				1585	<p>To print the complete list of debug methods, use <a href="#list">-list debug</a>.</p>
				1586
				1587	<p>Use the <a href="#log">-log</a> option to specify the format for debugging output.</p>
				1588
				1589	<p>Use <a href="#debug">+debug</a> to turn off all logging.</p>
				1590
				1591	<p>Debugging may also be set using the <kbd>MAGICK_DEBUG</kbd> <a href="../www/resources.html#environment">environment variable</a>. The allowed values for the <kbd>MAGICK_DEBUG</kbd> environment variable are the same as for the <a href="#debug">-debug</a> option.</p>
				1592
				1593
				1594	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1595	<h4><a id="decipher"></a>-decipher <em class="arg">filename</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1596	</div>
				1597
				1598	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Decipher and restore pixels that were previously transformed by <a href="#encipher">-encipher</a>.</td><td style='text-align:right;'></td></tr></table>
				1599
				1600	<p>Get the passphrase from the file specified by <em class="arg">filename</em>.</p>
				1601
				1602	<p>For more information, see the webpage, <a href="http://www.imagemagick.org/www/cipher.html">ImageMagick: Encipher or Decipher an Image</a>.</p>
				1603
				1604
				1605	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1606	<h4><a id="deconstruct"></a>-deconstruct</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1607	</div>
				1608
				1609	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>find areas that has changed between images </td><td style='text-align:right;'></td></tr></table>
				1610
				1611	<p>Given a sequence of images all the same size, such as produced by <a href="#coalesce">-coalesce</a>, replace the second and later images, with a smaller image of just the area that changed relative to the previous image. </p>
				1612
				1613	<p>The resulting sequence of images can be used to optimize an animation sequence, though will not work correctly for GIF animations when parts of the animation can go from opaque to transparent. </p>
				1614
				1615	<p>This option is actually equivalent to the <a href="#layers">-layers</a> method '<kbd>compare-any</kbd>'. </p>
				1616
				1617
				1618	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1619	<h4><a id="define"></a>-define <em class="arg">key</em>{<em class="arg">=value</em>}<em class="arg">...</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1620	</div>
				1621
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1622	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>add specific global settings generally used to control
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1623	coders and image processing operations.</td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1624
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1625	<p>This option creates one or more definitions for coders and decoders to use
				1626	while reading and writing image data. Definitions are generally used to
				1627	control image file format coder modules, and image processing operations,
				1628	beyond what is provided by normal means. Defined settings are listed in <a
				1629	href="#verbose" >-verbose</a> information ("<kbd>info:</kbd>" output format)
				1630	as "Artifacts". </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1631
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1632	<p>If <em class="arg">value</em> is missing for a definition, an empty-valued
				1633	definition of a flag is created with that name. This used to control on/off
				1634	options. Use <a href="#define">+define key</a> to remove definitions
				1635	previously created. Use <a href="#define">+define "*"</a> to remove all
				1636	existing definitions.</p>
				1637
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1638	<p>The same 'artifact' settings can also be defined using the <a
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1639	href="#set" >-set "option:<em class="arg">key</em>" "<em class="arg"
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1640	>value</em>"</a> option, which also allows the use of <a href="../www/escape.html" >Format and Print Image
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1641	Properties</a> in the defined value. </p>
				1642
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1643	<p>The <em>option</em> and <em>key</em> are case-independent (they are
				1644	converted to lowercase for use within the decoders) while the <em>value</em>
				1645	is case-dependent.</p>
				1646
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1647	<p>Such settings are global in scope, and effect all images and operations. </p>
				1648
				1649	<p>The following definitions are just some of the artifacts that are
				1650	available:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1651
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1652	<dl>
cristy	045bd90	2010-01-30 18:56:24 +0000	[diff] [blame]	1653	<dt>dcm:display-range=reset</dt>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1654	<dd>Set the display range to the minimum and maximum pixel values for the
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1655	DCM image format.</dd>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1656
cristy	045bd90	2010-01-30 18:56:24 +0000	[diff] [blame]	1657	<dt>dot:layout-engine=<em class="arg">value</em></dt>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1658	<dd>Set the specify the layout engine for the DOT image format (e.g.
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1659	<kbd>neato</kbd>).</dd>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1660
cristy	045bd90	2010-01-30 18:56:24 +0000	[diff] [blame]	1661	<dt>jpeg:extent=<em class="arg">value</em></dt>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1662	<dd>Restrict the maximum JPEG file size, for example <kbd>-define
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1663	jpeg:extent=400kb</kbd>.</dd>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1664
cristy	045bd90	2010-01-30 18:56:24 +0000	[diff] [blame]	1665	<dt>jpeg:size=<em class="arg">geometry</em></dt>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1666	<dd>Set the size hint of a JPEG image, for example, -define jpeg:size=128x128.
				1667	It is most useful for increasing performance and reducing the memory
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1668	requirements when reducing the size of a large JPEG image.</dd>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1669
cristy	045bd90	2010-01-30 18:56:24 +0000	[diff] [blame]	1670	<dt>jp2:rate=<em class="arg">value</em></dt>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1671	<dd>Specify the compression factor to use while writing JPEG-2000 files. The
				1672	compression factor is the reciprocal of the compression ratio. The valid
				1673	range is 0.0 to 1.0, with 1.0 indicating lossless compression. If defined,
				1674	this value overrides the -quality setting. A quality setting of 75
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1675	results in a rate value of 0.06641.</dd>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1676
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1677	<dt>mng:need-cacheoff</dt>
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1678	<dd>turn playback caching off for streaming MNG.</dd>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1679
cristy	045bd90	2010-01-30 18:56:24 +0000	[diff] [blame]	1680	<dt>png:bit-depth=<em class="arg">value</em></dt>
				1681	<dt>png:color-type=<em class="arg">value</em></dt>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1682	<dd>desired bit-depth and color-type for PNG output. You can force the PNG
				1683	encoder to use a different bit-depth and color-type than it would have
				1684	normally selected, but only if this does not cause any loss of image
				1685	quality. Any attempt to reduce image quality is treated as an error and no
				1686	PNG file is written. E.g., if you have a 1-bit black-and-white image, you
				1687	can use these "defines" to cause it to be written as an 8-bit grayscale,
				1688	indexed, or even a 64-bit RGBA. But if you have a 16-million color image,
				1689	you cannot force it to be written as a grayscale or indexed PNG. If you
				1690	wish to do this, you must use the appropriate <a href="#depth">-depth</a>,
				1691	<a href="#colors">-colors</a>, or <a href="#type">-type</a> directives to
				1692	reduce the image quality prior to using the PNG encoder. Note that in
				1693	indexed PNG files, "bit-depth" refers to the number of bits per index,
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1694	which can be 1, 2, 4, or 8. In such files, the color samples always have
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1695	8-bit depth.</dd>
				1696
				1697	<dt>png:exclude-chunk=<em class="arg">value</em></dt>
				1698	<dt>png:include-chunk=<em class="arg">value</em></dt>
				1699	<dd>ancillary chunks to be excluded from or included in PNG output.
				1700
				1701	<p>The<em class="arg">value</em> can be the name of a PNG chunk-type such
				1702	as <em class="arg">bKGD</em>, a comma-separated list of chunk-types,
				1703	or the word <em class="arg">all</em> or
				1704	the word <em class="arg">none</em>. There must be no spaces in the
				1705	list. Although PNG chunk-names are case-dependent, you can use
				1706	all lowercase names if you prefer.</p>
				1707
				1708	<p>As a special case, if the <kbd>sRGB</kbd> chunk is excluded and
				1709	the <kbd>gAMA</kbd> chunk is included, the <kbd>gAMA</kbd> chunk will
				1710	only be written if gamma is not 1/2.2, since most decoders assume
				1711	sRGB and gamma=1/2.2 when no colorspace information is included in
				1712	the PNG file. Because the list is processed from left to right, you
				1713	can achieve this with a single define:</p>
				1714
				1715	<pre class="text">
				1716	-define png:include-chunk=none,gAMA
				1717	</pre>
				1718
				1719	<p>The critical PNG chunks <kbd>IHDR</kbd>, <kbd>PLTE</kbd>,
				1720	<kbd>IDAT</kbd>, and <kbd>IEND</kbd> cannot be excluded. Any of
				1721	these entries appearing in the list will be ignored.</p>
				1722
				1723	<p>If the ancillary PNG <kbd>tRNS</kbd> chunk is excluded and the
				1724	image has transparency, the PNG colortype is forced to be 4 or 6
				1725	(GRAY_ALPHA or RGBA). If the image is not transparent, then the
				1726	<kbd>tRNS</kbd> chunk isn't written anyhow, and there is no effect
				1727	on the PNG colortype of the output image.</p>
				1728
				1729	<p>The <a href="#strip">-strip</a> option does the equivalent of the
				1730	following for PNG output:</p>
				1731
				1732	<pre class="text">
				1733	-define png:include-chunk=none,gama
				1734	</pre>
				1735
				1736	<p>The default behavior is to include all known PNG ancillary chunks
cristy	f796427	2011-01-30 03:49:12 +0000	[diff] [blame]	1737	plus ImageMagick's private <kbd>vpAg</kbd> ("virtual page") chunk,
				1738	and to exclude all PNG chunks that are unknown to ImageMagick,
				1739	regardless of their PNG "copy-safe" status as described in the
				1740	PNG specification.</p>
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1741	</dd>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1742
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1743	<dt>ps:imagemask</dt>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1744	<dd>If the ps:imagemask flag is defined, the PS3 and EPS3 coders will create
				1745	Postscript files that render bilevel images with the Postscript imagemask
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1746	operator instead of the image operator.</dd>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1747
cristy	045bd90	2010-01-30 18:56:24 +0000	[diff] [blame]	1748	<dt>quantum:format=<em class="arg">type</em></dt>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1749	<dd>Set the type to <kbd>floating-point</kbd> to specify a floating-point
				1750	format for raw files (e.g. GRAY:) or for MIFF and TIFF images in HDRI mode
				1751	to preserve negative values. If <a href="#depth">-depth</a> 16 is
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1752	included, the result is a single precision floating point format.
				1753	If <a href="#depth">-depth</a> 32 is included, the result is
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1754	double precision floating point format.</dd>
				1755
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1756	</dl>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1757
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1758	<p>For example, to create a postscript file that will render only the black
				1759	pixels of a bilevel image, use:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1760
				1761	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert bilevel.tif -define ps:imagemask eps3:stencil.ps</span></p>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1762	<p>Set attributes of the image registry by prefixing the value with
				1763	<kbd>registry:</kbd>. For example, to set a temporary path to put work files,
				1764	use:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1765
				1766	<p class="crtsnip">
				1767	-define registry:temporary-path=/data/tmp
				1768	</p>
				1769
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1770
				1771
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1772	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1773	<h4><a id="delay"></a>-delay <em class="arg">ticks</em> <br />-delay <em class="arg">ticks</em>x<em class="arg">ticks-per-second</em> {<em class="arg"><</em>} {<em class="arg">></em>}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1774	</div>
				1775
				1776	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>display the next image after pausing.</td><td style='text-align:right;'></td></tr></table>
				1777
				1778	<p>This option is useful for regulating the animation of image sequences <em>ticks/ticks-per-second</em> seconds must expire before the display of the next image. The default is no delay between each showing of the image sequence. The default ticks-per-second is 100.</p>
				1779
				1780	<p>Use <kbd>></kbd> to change the image delay <em>only</em> if its current value exceeds the given delay. <kbd><</kbd> changes the image delay <em>only</em> if current value is less than the given delay. For example, if you specify <kbd>30></kbd> and the image delay is 20, the image delay does not change. However, if the image delay is 40 or 50, the delay it is changed to 30. Enclose the given delay in quotation marks to prevent the <kbd><</kbd> or <kbd>></kbd> from being interpreted by your shell as a file redirection.</p>
				1781
				1782
				1783	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1784	<h4><a id="delete"></a>-delete <em class="arg">index</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1785	</div>
				1786
				1787	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>delete the image, specified by its index, from the image sequence.</td><td style='text-align:right;'></td></tr></table>
				1788
				1789	<p>Specify the image by its index in the sequence. The first image is index 0. Negative indexes are relative to the end of the sequence, for example, -1 represents the last image of the sequence. Specify a range of images with a dash (e.g. 0-4). Separate indexes with a comma (e.g. 0,2). Use <kbd>+delete</kbd> to delete the last image in the current image sequence.</p>
				1790
				1791
				1792	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1793	<h4><a id="density"></a>-density <em class="arg">width</em><br />-density <em class="arg">width</em>x<em class="arg">height</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1794	</div>
				1795
				1796	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the horizontal and vertical resolution of an image for rendering to devices.</td><td style='text-align:right;'></td></tr></table>
				1797
				1798	<p>This option specifies the image resolution to store while encoding a raster image or the canvas resolution while rendering (reading) vector formats such as Postscript, PDF, WMF, and SVG into a raster image. Image resolution provides the unit of measure to apply when rendering to an output device or raster image. The default unit of measure is in dots per inch (DPI). The <a href="#units">-units</a> option may be used to select dots per centimeter instead.</p>
				1799
				1800	<p>The default resolution is 72 dots per inch, which is equivalent to one point per pixel (Macintosh and Postscript standard). Computer screens are normally 72 or 96 dots per inch, while printers typically support 150, 300, 600, or 1200 dots per inch. To determine the resolution of your display, use a ruler to measure the width of your screen in inches, and divide by the number of horizontal pixels (1024 on a 1024x768 display).</p>
				1801
				1802	<p>If the file format supports it, this option may be used to update the stored image resolution. Note that Photoshop stores and obtains image resolution from a proprietary embedded profile. If this profile is not stripped from the image, then Photoshop will continue to treat the image using its former resolution, ignoring the image resolution specified in the standard file header.</p>
				1803
				1804	<p>The <a href="#density">-density</a> option sets an <em>attribute</em> and does not alter the underlying raster image. It may be used to adjust the rendered size for desktop publishing purposes by adjusting the scale applied to the pixels. To resize the image so that it is the same size at a different resolution, use the <a href="#resample">-resample</a> option.</p>
				1805
				1806	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1807	<h4><a id="depth"></a>-depth <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1808	</div>
				1809
				1810	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>depth of the image.</td><td style='text-align:right;'></td></tr></table>
				1811
				1812	<p>This the number of bits in a color sample within a pixel. Use this option to specify the depth of raw images whose depth is unknown such as GRAY, RGB, or CMYK, or to change the depth of any image after it has been read.</p>
				1813
				1814	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1815	<h4><a id="descend"></a>-descend</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1816	</div>
				1817
				1818	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>obtain image by descending window hierarchy.</td><td style='text-align:right;'></td></tr></table>
				1819
				1820	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1821	<h4><a id="deskew"></a>-deskew <em class="arg">threshold</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1822	</div>
				1823
				1824	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>straighten an image. A threshold of 40% works for most images.</td><td style='text-align:right;'></td></tr></table>
				1825
				1826	<p>Use <a href="#set">-set</a> <kbd>option:deskew:auto-crop <em>width</em></kbd> to auto crop the image. The set argument is the pixel width of the image background (e.g 40).</p>
				1827
				1828	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1829	<h4><a id="despeckle"></a>-despeckle</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1830	</div>
				1831
				1832	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>reduce the speckles within an image.</td><td style='text-align:right;'></td></tr></table>
				1833
				1834	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1835	<h4><a id="direction"></a>-direction <em class="arg">type</em></h4>
cristy	2c83960	2010-04-03 02:32:08 +0000	[diff] [blame]	1836	</div>
				1837
				1838	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>render text right-to-left or left-to-right.</td><td style='text-align:right;'></td></tr></table>
				1839
				1840	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1841	<h4><a id="displace"></a>-displace <em class="arg">horizontal-scale</em><br />-displace <em class="arg">horizontal-scale</em>x<em class="arg">vertical-scale</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1842	</div>
				1843
				1844	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>shift image pixels as defined by a displacement map.</td><td style='text-align:right;'>[<a href="../www/composite.html">composite</a>]</td></tr></table>
				1845
				1846	<p>With this option, the 'overlay' image, and optionally the 'mask' image,
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1847	is used as a displacement map, which is used to displace the lookup of
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1848	what part of the 'background' image is seen at each point of the overlaid
				1849	area. Much like the displacement map is a 'lens' that redirects light shining
				1850	through it so as to present a distorted view the original 'background' image
				1851	behind it. </p>
				1852
				1853	<p>Any perfect grey areas of the displacement map produce a zero
				1854	displacement of the image. Black areas produce the given maximum negative
				1855	displacement of the lookup point, while white produce a maximum positive
				1856	displacement of the lookup. </p>
				1857
				1858	<p>Note that it is the lookup of the 'background' that is displaced, not a
				1859	displacement of the image itself. As such an area of the displacement map
				1860	containing 'white' will have the lookup point 'shifted' by a positive amount,
				1861	and thus generating a copy of the destination image to the right/downward from
				1862	the correct position. That is the image will look like it may have been
				1863	'shifted' in a negative left/upward direction. Understanding this is a very
				1864	important in understanding how displacement maps work. </p>
				1865
				1866	<p>The given arguments define the maximum amount of displacement in pixels
				1867	that a particular map can produce. If the displacement scale is large enough
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1868	it is also possible to lookup parts of the 'background' image that lie well
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1869	outside the bounds of the displacement map itself. That is you could very
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1870	easily copy a section of the original image from outside the overlay area
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1871	into the overlay area. </p>
				1872
				1873	<p>The '%' flag makes the displacement scale relative to the size of the
				1874	overlay image (100% = half width/height of image). Using '!' switches
				1875	percentage arguments to refer to the destination image size instead.
				1876	these flags were added as of IM v6.5.3-5.</p>
				1877
				1878	<p>Normally a single grayscale displacement map is provided, which with the
				1879	given scaling values will determine a single direction (vector) in which
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1880	displacements can occur (positively or negatively). However, if you also
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1881	specify a third image which is normally used as a <em class="arg">mask</em>,
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1882	the <em class="arg">composite image</em> is used for horizontal X
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1883	displacement, while the <em class="arg">mask image</em> is used for vertical Y
				1884	displacement. This allows you to define completely different displacement
				1885	values for the X and Y directions, and allowing you to lookup any point within
				1886	the <em class="arg">scale</em> bounds. In other words each pixel can lookup
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1887	any other nearby pixel, producing complex 2 dimensional displacements, rather
				1888	than a simple 1 dimensional vector displacements. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1889
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1890	<p>Alteratively rather than suppling two separate images, as of IM v6.4.4-0,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1891	you can use the 'red' channel of the overlay image to specify the horizontal
				1892	or X displacement, and the 'green' channel for the vertical or Y displacement.
				1893	</p>
				1894
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1895	<p>As of IM v6.5.3-5 any alpha channel in the overlay image is used as a
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1896	mask the transparency of the destination image. However areas outside the
				1897	overlaid areas will not be effected. </p>
				1898
				1899
				1900	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1901	<h4><a id="display"></a>-display <em class="arg">host:display[.screen]</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1902	</div>
				1903
				1904	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Specifies the X server to contact.</td><td style='text-align:right;'>[<a href="../www/animate.html">animate</a>, <a href="../www/display.html">display</a>]</td></tr></table>
				1905
				1906	<p>This option is used with convert for obtaining image or font from this X server. See <em class="arg">X(1)</em>.</p>
				1907
				1908	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1909	<h4><a id="dispose"></a>-dispose <em class="arg">method</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1910	</div>
				1911
				1912	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>define the GIF disposal image setting for images that are being created or read in. </td><td style='text-align:right;'></td></tr></table>
				1913
				1914	<p>The layer disposal method defines the way each the displayed image is to be
				1915	modified after the current 'frame' of an animation has finished being
				1916	displayed (after its 'delay' period), but before the next frame on an
				1917	animation is to be overlaid onto the display. </p>
				1918
				1919	<p>Here are the valid methods:</p>
				1920
				1921	<pre class="text">
				1922	Undefined 0 No disposal specified (equivalent to '<kbd>none</kbd>').
				1923	None 1 Do not dispose, just overlay next frame image.
				1924	Background 2 Clear the frame area with the background color.
				1925	Previous 3 Clear to the image prior to this frames overlay.
				1926	</pre>
				1927
				1928	<p>You can also use the numbers given above, which is what the GIF format
				1929	uses internally to represent the above settings. </p>
				1930
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1931	<p>To print a complete list of dispose methods, use <a href="#list">-list dispose</a>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1932
				1933	<p>Use <a href="#dispose" >+dispose</a>, turn off the setting and prevent
				1934	resetting the layer disposal methods of images being read in. </p>
				1935
				1936	<p>Use <a href="#set">-set</a> '<kbd>dispose</kbd>' method to set the image
				1937	disposal method for images already in memory.</p>
				1938
				1939	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1940	<h4><a id="dissimilarity-threshold"></a>-dissimilarity-threshold <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1941	</div>
				1942
				1943	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>maximum RMSE for subimage match (default 0.2).</td><td style='text-align:right;'>[<a href="../www/compare.html">compare</a>]</td></tr></table>
				1944
				1945
				1946	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1947	<h4><a id="dissolve"></a>-dissolve <em class="arg">src_percent</em>[x<em class="arg">dst_percent</em>]</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1948	</div>
				1949
				1950	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>dissolve an image into another by the given percent.</td><td style='text-align:right;'>[<a href="../www/composite.html">composite</a>]</td></tr></table>
				1951
				1952	<p>The opacity of the composite image is multiplied by the given percent, then
				1953	it is composited 'over' the main image. If <em class="arg">src_percent</em>
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1954	is greater than 100, start dissolving the main image so it becomes
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1955	transparent at a value of '<kbd class="arg">200</kbd>'. If both percentages
				1956	are given, each image are dissolved to the percentages given. </p>
				1957
				1958	<p>Note that dissolve percentages do not add, two opaque images dissolved
				1959	'50,50', produce a 75% transparency. For a 50% + 50% blending of the two
				1960	images, you would need to use dissolve values of '50,100'. </p>
				1961
				1962	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1963	<h4><a id="distort"></a>-distort <em class="arg">method arguments</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1964	</div>
				1965
				1966	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>distort an image, using the given <em class="arg">method</em> and its required <em class="arg">arguments</em>.</td><td style='text-align:right;'></td></tr></table>
				1967
				1968	<p>The <em class="arg">arguments</em> is a single string containing a list
				1969	of floating point numbers separated by commas or spaces. The number of
				1970	and meaning of the floating point values depends on the distortion <em
				1971	class="arg">method</em> being used. </p>
				1972
				1973	<p>Choose from these distortion types:</p>
				1974
				1975	<table class="doc">
				1976	<tr valign="top">
				1977	<th align="left" style="width: 8%">Method</th>
				1978	<th align="left">Description</th>
				1979	</tr>
				1980
				1981	<tr valign="top">
				1982	<td valign="top"><kbd>ScaleRotateTranslate</kbd>
				1983	<br/>or   <kbd>SRT</kbd></td>
				1984	<td valign="top">
				1985	Distort image by first scaling and rotating about a given 'center',
				1986	before translating that 'center' to the new location, in that order. It
				1987	is an alternative method of specifying a '<kbd>Affine</kbd>' type of
				1988	distortion, but without shearing effects. It also provides a good way
				1989	of rotating and displacing a smaller image for tiling onto a larger
				1990	background (IE 2-dimensional animations). <br/>
				1991
				1992	The number of arguments determine the specific meaning of each
				1993	argument for the scales, rotation, and translation operations. <br/>
				1994
				1995	<table style="margin-left:auto; margin-right:auto;">
				1996	<tr><td>#  </td><td>arguments meaning</td></tr>
				1997	<tr><td>1:</td><td><em>Angle_of_Rotation</em></td></tr>
				1998	<tr><td>2:</td><td><em>Scale   Angle</em></td></tr>
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1999	<tr><td>3:</td><td><em>X,Y     Angle</em></td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2000	<tr><td>4:</td><td><em>X,Y   Scale   Angle</em></td></tr>
				2001	<tr><td>5:</td>
				2002	<td><em>X,Y   ScaleX,ScaleY   Angle</em></td></tr>
				2003	<tr><td>6:</td>
				2004	<td><em>X,Y   Scale   Angle   NewX,NewY</em></td></tr>
				2005	<tr><td>7:</td>
				2006	<td><em>X,Y   ScaleX,ScaleY   Angle
				2007	NewX,NewY</em></td></tr>
				2008	</table>
				2009
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2010	This is actually an alternative way of specifying a 2 dimensional linear
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2011	'<kbd>Affine</kbd>' or '<kbd>AffineProjection</kbd>' distortion. </td> </tr>
				2012
				2013	<tr valign="top">
				2014	<td valign="top"><kbd>Affine</kbd></td>
				2015	<td valign="top">
				2016	Distort the image linearly by moving a list of at least 3 or more sets
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2017	of control points (as defined below). Ideally 3 sets or 12 floating
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2018	point values are given allowing the image to be linearly scaled,
				2019	rotated, sheared, and translated, according to those three points. See
				2020	also the related '<kbd>AffineProjection</kbd>' and '<kbd>SRT</kbd>'
				2021	distortions. <br/>
				2022
				2023	More than 3 sets given control point pairs (12 numbers) is least
				2024	squares fitted to best match a lineary affine distortion. If only 2
				2025	control point pairs (8 numbers) are given a two point image translation
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2026	rotation and scaling is performed, without any possible shearing,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2027	flipping or changes in aspect ratio to the resulting image. If only one
				2028	control point pair is provides the image is only translated, (which may
				2029	be a floating point non-integer translation). <br/>
				2030
				2031	This distortion does not include any form of perspective distortion.
				2032	</td>
				2033
				2034	</tr>
				2035
				2036	<tr valign="top">
				2037	<td valign="top"><kbd>AffineProjection</kbd></td>
				2038	<td valign="top">
				2039	Linearly distort an image using the given Affine Matrix of 6
				2040	pre-calculated coefficients forming a set of Affine Equations to map
				2041	the source image to the destination image.
				2042
				2043	<div style="text-align: center"><em>
				2044	s<sub>x</sub>, r<sub>x</sub>,
				2045	r<sub>y</sub>, s<sub>y</sub>,
				2046	t<sub>x</sub>, t<sub>y</sub>
				2047	</em></div>
				2048
				2049	See <a href="#affine" >-affine</a> setting for more detail, and
				2050	meanings of these coefficients. <br/>
				2051
				2052	The distortions '<kbd>Affine</kbd>' and '<kbd>SRT</kbd>' provide
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2053	alternative methods of defining this distortion, with ImageMagick doing
				2054	the calculations needed to generate the required coefficients. You can
				2055	see the internally generated coefficients, by using a <a
				2056	href="#verbose" >-verbose</a> setting with those other varients. </td>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2057
				2058	</tr>
				2059
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2060	<tr valign="top">
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2061	<td valign="top"><kbd>BilinearForward</kbd><br/>
				2062	<kbd>BilinearReverse</kbd></td>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2063	<td valign="top">
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2064	Bilinear Distortion, given a minimum of 4 sets of coordinate pairs, or
				2065	16 values (see below). Not that lines may not appear straight after
				2066	distortion, though the distance between coordinates will remain
				2067	consistent. <br/>
				2068
				2069	The '<kbd>BilinearForward</kbd>' is used to map rectangles to any
				2070	quadrilateral, while the '<kbd>BilinearReverse</kbd>' form maps any
				2071	quadrilateral to a rectangle, while preserving the straigth line edges
				2072	in each case. <br/>
				2073
				2074	Note that '<kbd>BilinearForward</kbd>' can generate invalid pixels
				2075	which will be colored using the <a href="#mattecolor" >-mattecolor</a>
				2076	color setting. Also if the quadraterial becomes 'flipped' the image
				2077	may dissappear. <br/>
				2078
				2079	There are future plans to produce a true Bilinear distortion that will
				2080	attempt to map any quadrilateral to any other quadrilateral, while
				2081	preserving edges (and edge distance ratios).
				2082
				2083	</td>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2084	</tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2085
				2086	<tr valign="top">
				2087	<td valign="top"><kbd>Perspective</kbd></td>
				2088	<td valign="top">
				2089	Perspective distort the images, using a list of 4 or more sets of
				2090	control points (as defined below). More that 4 sets (16 numbers) of
				2091	control points provide least squares fitting for more accurate
				2092	distortions (for the purposes of image registration and panarama
				2093	effects). Less than 4 sets will fall back to a '<kbd>Affine</kbd>'
				2094	linear distortion. <br/>
				2095
				2096	Perspective Distorted images ensures that straight lines remain
				2097	straight, but the scale of the distorted image will vary. The horizon
				2098	is anti-aliased, and the 'sky' color may be set using the
				2099	<a href="#mattecolor" >-mattecolor</a> setting. </td>
				2100	</tr>
				2101
				2102	<tr valign="top">
				2103	<td valign="top"><kbd>PerspectiveProjection</kbd>  </td>
				2104	<td valign="top">
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2105	Do a '<kbd>Perspective</kbd>' distortion biased on a set of 8
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2106	pre-calculated coefficients. You can get these coefficients by looking
				2107	at the <a href="#verbose" >-verbose</a> output of a
				2108	'<kbd>Prespective</kbd>' distortion, or by calculating them yourself.
				2109	If the last two perspective scaling coefficients are zero, the
				2110	remaining 6 represents a transposed 'Affine Matrix'. </td>
				2111
				2112	</tr>
				2113
				2114	<tr valign="top">
				2115	<td valign="top"><kbd>Arc</kbd></td>
				2116	<td valign="top">
				2117	Arc the image (variation of polar mapping) over the angle given around
				2118	a circle. <br/>
				2119	<table width="90%" style = "margin-left: auto; margin-right: auto;">
				2120	<tr valign="top"><td>Argument</td>
				2121	<td>Meaning</td></tr>
				2122	<tr valign="top"><td><em>arc_angle</em></td>
				2123	<td>The angle over which to arc the image side-to-side</td></tr>
				2124	<tr valign="top"><td><em>rotate_angle</em></td>
				2125	<td>Angle to rotate resulting image from vertical center</td></tr>
				2126	<tr valign="top"><td><em>top_radius</em></td>
				2127	<td>Set top edge of source image at this radius</td></tr>
				2128	<tr valign="top"><td><em>bottom_radius</em> </td>
				2129	<td>Set bottom edge to this radius (radial scaling)</td></tr>
				2130	</table>
				2131
				2132	The resulting image is always resized to best fit the resulting image,
				2133	(as if using <a href="#distort" >+distort</a>) while attempting to
				2134	preserve scale and aspect ratio of the original image as much as
				2135	possible with the arguments given by the user. All four arguments will
				2136	be needed to change the overall aspect ratio of an 'Arc'ed image. <br/>
				2137
				2138	This a variation of a polar distortion designed to try to preserve the
				2139	aspect ratio of the image rather than direct Cartesian to Polar
				2140	conversion. </td>
				2141	</tr>
				2142
				2143	<tr valign="top">
				2144	<td valign="top"><kbd>Polar</kbd></td>
				2145	<td valign="top">
				2146	Like '<kbd>Arc</kbd>' but do a complete Cartesian to Polar mapping of
				2147	the image. that is the height of the input image is mapped to the
				2148	radius limits, while the width is wrapped around between the
				2149	angle limits. <br/>
				2150
				2151	Arguments: <em>Rmax,Rmin CenterX,CenterY, start,end_angle</em> <br/>
				2152
				2153	All arguments are optional. With <em>Rmin</em> defaulting to zero, the
				2154	center to the center of the image, and the angles going from -180 (top)
				2155	to +180 (top). If <em>Rmax</em> is given the special value of
				2156	'<code>0</code>', the the distance from the center to the nearest edge
				2157	is used for the radius of the output image, which will ensure the whole
				2158	image is visible (though scaled smaller). However a special value of
				2159	'<code>-1</code>' will use the distance from the center to the furthest
				2160	corner, This may 'clip' the corners from the input rectangular image,
				2161	but will generate the exact reverse of a '<kbd>DePolar</kbd>' with
				2162	the same arguments. <br/>
				2163
				2164	If the plus form of distort (<a href="#distort" >+distort</a>) is used
				2165	output image center will default to <code>0,0</code> of the virtual
				2166	canvas, and the image size adjusted to ensure the whole input image is
				2167	made visible in the output image on the virtual canvas. </td>
				2168
				2169	</tr>
				2170
				2171	<tr valign="top">
				2172	<td valign="top"><kbd>DePolar</kbd></td>
				2173	<td valign="top">
				2174	Uses the same arguments and meanings as a '<kbd>Polar</kbd>' distortion
				2175	but generates the reverse Polar to Cartesian distortion. <br/>
				2176
				2177	The special <em>Rmax</em> setting of '<code>0</code>' may however clip
				2178	the corners of the input image. However using the special
				2179	<em>Rmax</em> setting of '<code>-1</code>' (maximum center to corner
				2180	distance) will ensure the whole distorted image is preserved in the
				2181	generated result, so that the same argument to '<kbd>Polar</kbd>' will
				2182	reverse the distortion re-producing the original.
				2183
				2184	Note that as this distortion requires the area resampling of a circular
				2185	arc, which can not be handled by the builtin EWA resampling function.
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2186	As such the normal EWA filters are turned off. It is recommended some
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2187	form of 'super-sampling' image processing technique be used to produce
				2188	a high quality result. </td>
				2189
				2190	</tr>
				2191
				2192	<tr valign="top">
				2193	<td valign="top"><kbd>Barrel</kbd></td>
				2194	<td valign="top">
				2195	Given the four coefficients (A,B,C,D) as defined by <a
				2196	href="http://www.all-in-one.ee/~dersch/barrel/barrel.html" >Helmut
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2197	Dersch</a>, perform a barrell or pin-cushion distortion appropriate to
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2198	correct radial lens distortions. That is in photographs, make straight
				2199	lines straight again. <br/>
				2200
				2201	Arguments: <em>A   B   C</em>   [ <em>D</em>   [
				2202	<em>X</em> , <em>Y</em> ] ] <br/>
				2203	or <em>A<sub>x</sub> B<sub>x</sub> C<sub>x</sub> D<sub>x</sub>
				2204	A<sub>y</sub> B<sub>y</sub> C<sub>y</sub> D<sub>y</sub></em>
				2205	[ <em>X</em> , <em>Y</em> ] <br/>
				2206	So that it forms the function <br/>
				2207	Rsrc = r * ( <em>A</em>r<sup>3</sup> + <em>B</em>r<sup>2</sup> +
				2208	<em>C</em>*r + <em>D</em> )<br/>
				2209
				2210	Where <em>X</em>,<em>Y</em> is the optional center of the distortion
				2211	(defaulting to the center of the image). <br/>
				2212	The second form is typically used to distort images, rather than
				2213	correct lens distortions. <br/>
				2214	</td>
				2215
				2216	</tr>
				2217
				2218	<tr valign="top">
				2219	<td valign="top"><kbd>BarrelInverse</kbd></td>
				2220	<td valign="top">
				2221	This is very simular to '<kbd>Barrel</kbd>' with the same set of
				2222	arguments, and argument handling. However it uses the inverse
				2223	of the radial polynomial,
				2224	so that it forms the function <br/>
				2225	Rsrc = r / ( <em>A</em>r<sup>3</sup> + <em>B</em>r<sup>2</sup> +
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2226	<em>C</em>*r + <em>D</em> )<br/>
				2227	Note that this is not the reverse of the '<kbd>Barrel</kbd>'
				2228	distortion, just a different barrel-like radial distortion method.
				2229
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2230	</td>
				2231	</tr>
				2232
				2233	<tr valign="top">
				2234	<td valign="top"><kbd>Shepards</kbd></td>
				2235	<td valign="top">
				2236	Distort the given list control points (any number) using an Inverse
				2237	Squared Distance Interpolation Method (<a
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2238	href="http://en.wikipedia.org/wiki/Shepard%27s_method" >Shepards
				2239	Method</a>). The control points in effect do 'localized' displacement
				2240	of the image around the given control point (preserving the look and
				2241	the rotation of the area near the control points. For best results
				2242	extra control points should be added to 'lock' the positions of the
				2243	corners, edges and other unchanging parts of the image, to prevent
				2244	their movement. <br/>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2245
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2246	The distortion has been likened to 'taffy pulling' using nails, or
				2247	pins' stuck in a block of 'jelly' which is then moved to the new
				2248	position, distorting te surface of the jelly. <br/>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2249
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2250	Internally it is equivelent to generating a displacement map (see <a
				2251	href="#displace" >-displace</a>) for source image color look-up using
				2252	the <a href="#sparse-color" >-sparse-color</a> method of the same name.
				2253
				2254	</td>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2255	</tr>
				2256
				2257	</table>
				2258
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2259	<p>To print a complete list of distortion methods, use <a href="#list">-list
				2260	distort</a>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2261
				2262	<p>Many of the above distortion methods such as '<kbd>Affine</kbd>',
				2263	'<kbd>Perspective</kbd>', and '<kbd>Shepards</kbd>' use a list control points
				2264	defining how these points in the given image should be distorted in the
				2265	destination image. Each set of four floating point values represent a source
				2266	image coordinate, followed immediately by the destination image coordinate.
				2267	This produces a list of values such as...</p>
				2268	<div style="text-align: center"><em>
				2269	U<sub>1</sub>,V<sub>1</sub> X<sub>1</sub>,Y<sub>1</sub>
				2270	U<sub>2</sub>,V<sub>2</sub> X<sub>2</sub>,Y<sub>2</sub>
				2271	U<sub>3</sub>,V<sub>3</sub> X<sub>3</sub>,Y<sub>3</sub>
				2272	...
				2273	U<sub>n</sub>,V<sub>n</sub> X<sub>n</sub>,Y<sub>n</sub>
				2274	</em></div>
				2275	<p>where <em>U,V</em> on the source image is mapped to <em>X,Y</em> on the
				2276	destination image. </p>
				2277
				2278	<p>For example, to warp an image using '<kbd>perspective</kbd>' distortion,
				2279	needs a list of at least 4 sets of coordinates, or 16 numbers. Here is the
				2280	perspective distortion of the built-in "rose:" image. Note how spaces were
				2281	used to group the 4 sets of coordinate pairs, to make it easier to read and
				2282	understand.</p>
				2283
				2284	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2285	convert rose: -virtual-pixel black \<br/>
				2286	-distort Perspective '0,0,0,0 0,45,0,45 69,0,60,10 69,45,60,35' \<br/>
				2287	rose_3d_rotated.gif</span></p>
				2288	<p>If more that the required number of coordinate pairs are given for
				2289	a distortion, the distortion method is 'least squares' fitted to produce the
				2290	best result for all the coordinate pairs given. If less than the ideal number
				2291	of points are given, the distort will generally fall back to a simpler form of
				2292	distortion that can handles the smaller number of coordinates (usally a linear
				2293	'<kbd>Affine</kbd>' distortion). </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2294
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2295	<p>By using more coordinates you can make use of image registration tool to
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2296	find matching coordinate pairs in overlapping images, so as to improve the
				2297	'fit' of the distortion. Of course a bad coordinate pair can also make the
				2298	'fit' worse. Caution is always advised. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2299
				2300	<p>Colors are acquired from the source image according to the <a
				2301	href="#interpolate" >-interpolate</a> color lookup setting, when the image is
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2302	magnified. However if the viewed image is minified (image becomes smaller),
				2303	a special area resampling function (added ImageMagick v6.3.5-9), is used to
				2304	produce a higher quality image. For example you can use
				2305	a '<kbd>perspective</kbd>' distortion to view a infinitely tiled 'plane' all
				2306	the way to the horizon. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2307
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2308	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>
				2309	convert -size 90x90 pattern:checkerboard -normalize -virtual-pixel tile \<br/>
				2310	-distort perspective '0,0,5,45 89,0,45,46 0,89,0,89 89,89,89,89' \<br/>
				2311	checks_tiled.jpg</span></p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2312	<p>Note that a infinitely tiled perspective images involving the horizon can
				2313	be very slow to generate due to the use of the high quality 'area resampling'
				2314	function (added ImageMagick v6.3.5-9). You can turn off 'area resampling'
				2315	using a <a href="#filter" >-filter</a> setting of '<kbd>point</kbd>'
				2316	(recommended if you plan to use super-sampling instead). </p>
				2317
				2318	<p>If an image generates <i>invalid pixels</i>, such as the 'sky' in the last
				2319	'<kbd>perspective</kbd>' distortion example, <a href="#distort" >-distort</a>
				2320	will use the current <a href="#mattecolor" >-mattecolor</a> setting for these
				2321	pixels. If you do not what these pixels to be visible, set the color to match
				2322	the rest of the ground. </p>
				2323
				2324	<p>The output image size will by default be the same as the input image. This
				2325	means that if the part of the distorted image falls outside the viewed area of
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2326	the 'distorted space', those parts is clipped and lost. However if you use
				2327	the plus form of the operator (<a href="#distort" >+distort</a>) the operator
				2328	will attempt (if possible) to show the whole of the distorted image, while
				2329	retaining a correct 'virtual canvas' offset, for image layering. This offset
				2330	may need to be removed using <a href="#repage" >+repage</a>, to remove if it
				2331	is unwanted. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2332
				2333	<p>You can alternatively specify a special "<kbd><a href="#set" >-set</a>
				2334	option:distort:viewport {geometry_string}</kbd>" setting which will specify
				2335	the size and the offset of the generated 'viewport' image of the distorted
				2336	image space.</p>
				2337
				2338	<p>Adding a "<kbd><a href="#set" >-set</a> option:distort:scale
				2339	{scale_factor}</kbd>" will scale the output image (viewport or otherwise) by
				2340	that factor without changing the viewed contents of the distorted image. This
				2341	can be used either for 'super-sampling' the image for a higher quality result,
				2342	or for panning and zooming around the image (with appropriate viewport
				2343	changes, or post-distort cropping and resizing). </p>
				2344
				2345	<p>Setting <a href="#verbose" >-verbose</a> setting, will cause <a
				2346	href="#distort" >-distort</a> to attempt to output the internal coefficients,
				2347	and the <a href="#fx" >-fx</a> equivalent to the distortion, for expert study,
				2348	and debugging purposes. This many not be available for all distorts. </p>
				2349
				2350	<p>Affine rotations and shears (such as '<kbd>SRT</kbd>' distortion), tend to
				2351	produce a cleaner result that the equivalent <a href="#rotate" >-rotate</a>
				2352	and/or <a href="#shear" >-shear</a> operation, with more control of due to the
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2353	above settings. It is algorithmically slower however, though that may not be
				2354	the case in ImageMagick's implementation. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2355
				2356
				2357	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2358	<h4><a id="dither"></a>-dither <em class="arg">method</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2359	</div>
				2360
				2361	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Apply a Riemersma or Floyd-Steinberg error diffusion dither to images when general color reduction is applied via an option, or automagically when saving to specific formats. This enabled by default. </td><td style='text-align:right;'></td></tr></table>
				2362
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2363	<p>Dithering places two or more colors in neighboring pixels so that to the eye a closer approximation of the images original color is reproduced. This reduces the number of colors needed to reproduce the image but at the cost of a lower level pattern of colors. Error diffusion dithers can use any set of colors (generated or user defined) to an image. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2364
				2365	<p>Dithering is turned on by default, to turn it off use the plus form of the
				2366	setting, <a href="#dither">+dither</a>. This will also also render PostScript
				2367	without text or graphic aliasing. Disabling dithering often (but not always)
				2368	leads to faster process, a smaller number of colors, but more cartoon like
				2369	image coloring. Generally resulting in 'color banding' effects in areas with
				2370	color gradients. </p>
				2371
				2372	<p>The color reduction operators <a href="#colors">-colors</a>, <a
				2373	href="#monochrome">-monochrome</a>, <a href="#remap ">-remap</a>, and <a href="#posterize">-posterize</a>, apply dithering to images using the reduced color set they created. These operators are also used as part of automatic color reduction when saving images to formats with limited color support, such as <kbd>GIF:</kbd>, <kbd>XBM:</kbd>, and others, so dithering may also be used in these cases. </p>
				2374
				2375	<p>Alternatively you can use <a href="#random-threshold">-random-threshold</a> to generate purely random dither. Or use <a href="#ordered-dither">-ordered-dither</a> to apply threshold mapped dither patterns, using uniform color maps, rather than specific color maps. </p>
				2376
				2377
				2378	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2379	<h4><a id="draw"></a>-draw <em class="arg">string</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2380	</div>
				2381
				2382	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Annotate an image with one or more graphic primitives.</td><td style='text-align:right;'></td></tr></table>
				2383
				2384	<p>Use this option to annotate or decorate an image with one or more graphic primitives. The primitives include shapes, text, transformations, and pixel operations.</p>
				2385
				2386	<p>The shape primitives:</p>
				2387
				2388	<pre class="text">
				2389	point x,y
				2390	line x0,y0 x1,y1
				2391	rectangle x0,y0 x1,y1
				2392	roundRectangle x0,y0 x1,y1 wc,hc
				2393	arc x0,y0 x1,y1 a0,a1
				2394	ellipse x0,y0 rx,ry a0,a1
				2395	circle x0,y0 x1,y1
				2396	polyline x0,y0 ... xn,yn
				2397	polygon x0,y0 ... xn,yn
				2398	bezier x0,y0 ... xn,yn
				2399	path path specification
				2400	image operator x0,y0 w,h filename
				2401	</pre>
				2402
				2403	<p>The text primitive:</p>
				2404
				2405	<pre class="text">
				2406	text x0,y0 string
				2407	</pre>
				2408	<p>The text gravity primitive:</p>
				2409
				2410	<pre class="text">
				2411	gravity NorthWest, North, NorthEast, West, Center,
				2412	East, SouthWest, South, or SouthEast
				2413	</pre>
				2414
				2415	<p>The text gravity primitive only affects the placement of text and does not interact with the other primitives. It is equivalent to using the <a href="#gravity">-gravity</a> command-line option, except that it is limited in scope to the <a href="#draw">-draw</a> option in which it appears.</p>
				2416
				2417	<p>The transformation primitives:</p>
				2418
				2419	<pre class="text">
				2420	rotate degrees
				2421	translate dx,dy
				2422	scale sx,sy
				2423	skewX degrees
				2424	skewY degrees
				2425	</pre>
				2426
				2427	<p>The pixel operation primitives:</p>
				2428
				2429	<pre class="text">
				2430	color x0,y0 method
				2431	matte x0,y0 method
				2432	</pre>
				2433
				2434	<p>The shape primitives are drawn in the color specified by the preceding <a href="#fill">-fill</a> setting. For unfilled shapes, use <a href="#fill">-fill none</a>. You can optionally control the stroke (the "outline" of a shape) with the <a href="#stroke">-stroke</a> and <a href="#strokewidth">-strokewidth</a> settings.</p>
				2435
				2436	<p>A <kbd>point</kbd> primitive is specified by a single <em>point</em> in the pixel plane, that is, by an ordered pair of integer coordinates, <em>x</em>,<em>y</em>. (As it involves only a single pixel, a <kbd>point</kbd> primitive is not affected by <a href="#stroke">-stroke</a> or <a href="#strokewidth">-strokewidth</a>.)</p>
				2437
				2438	<p>A <kbd>line</kbd> primitive requires a start point and end point.</p>
				2439
				2440	<p>A <kbd>rectangle</kbd> primitive is specified by the pair of points at the upper left and lower right corners.</p>
				2441
				2442	<p>A <kbd>roundRectangle</kbd> primitive takes the same corner points as a <kbd>rectangle</kbd> followed by the width and height of the rounded corners to be removed.</p>
				2443
				2444	<p>The <kbd>circle</kbd> primitive makes a disk (filled) or circle (unfilled). Give the center and any point on the perimeter (boundary).</p>
				2445
				2446	<p>The <kbd>arc</kbd> primitive is used to inscribe an elliptical segment in to a given rectangle. An <kbd>arc</kbd> requires the two corners used for <kbd>rectangle</kbd> (see above) followed by the start and end angles of the arc of the segment segment (e.g. 130,30 200,100 45,90). The start and end points produced are then joined with a line segment and the resulting segment of an ellipse is filled.</p>
				2447
				2448	<p>Use <kbd>ellipse</kbd> to draw a partial (or whole) ellipse. Give the center point, the horizontal and vertical "radii" (the <em>semi-axes</em> of the ellipse) and start and end angles in degrees (e.g. 100,100 100,150 0,360).</p>
				2449
				2450	<p>The <kbd>polyline</kbd> and <kbd>polygon</kbd> primitives require three or more points to define their perimeters. A <kbd>polyline</kbd> is simply a <kbd>polygon</kbd> in which the final point is not stroked to the start point. When unfilled, this is a <em>polygonal line</em>. If the <a href="#stroke">-stroke</a> setting is <kbd>none</kbd> (the default), then a <kbd>polyline</kbd> is identical to a <kbd>polygon</kbd>.
				2451	</p>
				2452
				2453	<p>A <em>coordinate</em> is a pair of integers separated by a space or optional comma. </p>
				2454
				2455	<p>As an example, to define a circle centered at 100,100 that extends to 150,150 use:</p>
				2456
				2457	<p class="crtsnip">
				2458	-draw 'circle 100,100 150,150'
				2459	</p>
				2460
				2461	<p>The <kbd>Bezier</kbd> primitive creates a spline curve and requires three or points to define its shape. The first and last points are the <em>knots</em> and these points are attained by the curve, while any intermediate coordinates are <em>control points</em>. If two control points are specified, the line between each end knot and its sequentially respective control point determines the tangent direction of the curve at that end. If one control point is specified, the lines from the end knots to the one control point determines the tangent directions of the curve at each end. If more than two control points are specified, then the additional control points act in combination to determine the intermediate shape of the curve. In order to
				2462	draw complex curves, it is highly recommended either to use the <kbd>path</kbd> primitive or to draw multiple four-point bezier segments with the start and end knots of each successive segment repeated. For example:</p>
				2463
				2464	<p class="crtsnip">
				2465	-draw 'bezier 20,50 45,100 45,0 70,50'
				2466	</p>
				2467	<p class="crtsnip">
				2468	-draw 'bezier 70,50 95,100 95,0 120,50'
				2469	</p>
				2470
				2471
				2472	<p>A <kbd>path</kbd> represents an outline of an object, defined in terms of moveto (set a new current point), lineto (draw a straight line), curveto (draw a Bezier curve), arc (elliptical or circular arc) and closepath (close the current shape by drawing a line to the last moveto) elements. Compound paths (i.e., a path with subpaths, each consisting of a single moveto followed by one or more line or curve operations) are possible to allow effects such as <em>donut holes</em> in objects. (See <a href="http://www.w3.org/TR/SVG/paths.html">Paths</a>.)</p>
				2473
				2474	<p>Use <kbd>image</kbd> to composite an image with another image. Follow the image keyword with the composite operator, image location, image size, and filename:</p>
				2475
				2476	<p class="crtsnip">
				2477	-draw 'image SrcOver 100,100 225,225 image.jpg'
				2478	</p>
				2479
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	2480	<p>You can use 0,0 for the image size, which means to use the actual
				2481	dimensions found in the image header. Otherwise, it is scaled to the given
				2482	dimensions. See <a href="../www/compose.html">Alpha Compositing</a> for
				2483	a detailed discussion of alpha composition methods that are available. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2484
				2485	<p>Use <kbd>text</kbd> to annotate an image with text. Follow the text coordinates with a string. If the string has embedded spaces, enclose it in single or double quotes.</p>
				2486
				2487	<p>For example, the following annotates the image with <kbd>Works like magick!</kbd> for an image titled <kbd>bird.miff</kbd>. </p>
				2488
				2489	<p class="crtsnip">
				2490	-draw 'text 100,100 "Works like magick!"'
				2491	</p>
				2492
				2493	<p>See the <a href="#annotate">-annotate</a> option for another convenient way to annotate an image with text.</p>
				2494
				2495	<p>The <kbd>rotate</kbd> primitive rotates subsequent shape primitives and text primitives about the origin of the main image. If the <a href="#region">-region</a> option precedes the <a href="#draw">-draw</a> option, the origin for transformations is the upper left corner of the region.</p>
				2496
				2497	<p>The <kbd>translate</kbd> primitive translates subsequent shape and text primitives.</p>
				2498
				2499	<p>The <kbd>scale</kbd> primitive scales them.</p>
				2500
				2501	<p>The <kbd>skewX</kbd> and <kbd>skewY</kbd> primitives skew them with respect to the origin of the main image or the region.</p>
				2502
				2503	<p>The transformations modify the current affine matrix, which is initialized from the initial affine matrix defined by the <a href="#affine">-affine</a> option. Transformations are cumulative within the <a href="#draw">-draw</a> option. The initial affine matrix is not affected; that matrix is only changed by the appearance of another <a href="#affine">-affine</a> option. If another <a href="#draw">-draw</a> option appears, the current affine matrix is reinitialized from the initial affine
				2504	matrix.</p>
				2505
				2506	<p>Use the <kbd>color</kbd> primitive to change the color of a pixel to the fill color (see <a href="#fill">-fill</a>). Follow the pixel coordinate with a method:</p>
				2507
				2508	<pre class="text">
				2509	point
				2510	replace
				2511	floodfill
				2512	filltoborder
				2513	reset
				2514	</pre>
				2515
				2516	<p>Consider the target pixel as that specified by your coordinate. The <kbd>point</kbd> method recolors the target pixel. The <kbd>replace</kbd> method recolors any pixel that matches the color of the target pixel. <kbd>Floodfill</kbd> recolors any pixel that matches the color of the target pixel and is a neighbor, whereas <kbd>filltoborder</kbd> recolors any neighbor pixel that is not the border color. Finally, <kbd>reset</kbd> recolors all pixels.</p>
				2517
				2518	<p>Use <kbd>matte</kbd> to the change the pixel matte value to transparent. Follow the pixel coordinate with a method (see the <kbd>color</kbd> primitive for a description of methods). The <kbd>point</kbd> method changes the matte value of the target pixel. The <kbd>replace</kbd> method changes the matte value of any pixel that matches the color of the target pixel. <kbd>Floodfill</kbd> changes the matte value of any pixel that matches the color of the target pixel and is a neighbor, whereas <kbd>filltoborder</kbd> changes the matte value of any neighbor pixel that is not the border color (<a href="#bordercolor">-bordercolor</a>). Finally <kbd>reset</kbd> changes the matte value of all pixels.</p>
				2519
				2520	<p>You can set the primitive color, font, and font bounding box color with <a href="#fill">-fill</a>, <a href="#font">-font</a>, and <a href="#box">-box</a> respectively. Options are processed in command line order so be sure to use these options <em>before</em> the <a href="#draw">-draw</a> option.</p>
				2521
				2522	<p>Strings that begin with a number must be quoted (e.g. use '1.png' rather than 1.png).</p>
				2523
				2524	<p>Drawing primitives conform to the <a href="../www/magick-vector-graphics.html">Magick Vector Graphics</a> format.</p>
				2525
				2526
				2527	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2528	<h4><a id="edge"></a>-edge <em class="arg">radius</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2529	</div>
				2530
				2531	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>detect edges within an image.</td><td style='text-align:right;'></td></tr></table>
				2532
				2533	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2534	<h4><a id="emboss"></a>-emboss <em class="arg">radius</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2535	</div>
				2536
				2537	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>emboss an image.</td><td style='text-align:right;'></td></tr></table>
				2538
				2539	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2540	<h4><a id="encipher"></a>-encipher <em class="arg">filename</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2541	</div>
				2542
				2543	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Encipher pixels for later deciphering by <a href="#decipher">-decipher</a>.</td><td style='text-align:right;'></td></tr></table>
				2544
				2545	<p>Get the passphrase from the file specified by <em class="arg">filename</em>.</p>
				2546
				2547	<p>For more information, see the webpage, <a href="http://www.imagemagick.org/www/cipher.html">ImageMagick: Encipher or Decipher an Image</a>.</p>
				2548
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2549
				2550
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2551	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2552	<h4><a id="encoding"></a>-encoding <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2553	</div>
				2554
				2555	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>specify the text encoding.</td><td style='text-align:right;'></td></tr></table>
				2556
				2557	<p>Choose from <kbd>AdobeCustom</kbd>, <kbd>AdobeExpert</kbd>, <kbd>AdobeStandard</kbd>, <kbd>AppleRoman</kbd>, <kbd>BIG5</kbd>, <kbd>GB2312</kbd>, <kbd>Latin 2</kbd>, <kbd>None</kbd>, <kbd>SJIScode</kbd>, <kbd>Symbol</kbd>, <kbd>Unicode</kbd>, <kbd>Wansung</kbd>.</p>
				2558
				2559	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2560	<h4><a id="endian"></a>-endian <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2561	</div>
				2562
				2563	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Specify endianness (<kbd>MSB</kbd> or <kbd>LSB</kbd>) of the image.</td><td style='text-align:right;'></td></tr></table>
				2564
				2565	<p>To print a complete list of endian types, use the <a href="#list">-list endian</a> option.</p>
				2566
				2567	<p>Use <a href="#endian">+endian</a> to revert to unspecified endianness.</p>
				2568
				2569
				2570	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2571	<h4><a id="enhance"></a>-enhance</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2572	</div>
				2573
				2574	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Apply a digital filter to enhance a noisy image.</td><td style='text-align:right;'></td></tr></table>
				2575
				2576
				2577	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2578	<h4><a id="equalize"></a>-equalize</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2579	</div>
				2580
				2581	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>perform histogram equalization on the image channel-by-channel.</td><td style='text-align:right;'></td></tr></table>
				2582
				2583	<p>To perform histogram equalization on all channels in concert, transform the image into some other color space, such as HSL, OHTA, YIQ or YUV, then equalize the appropriate intensity-like channel, then convert back to RGB.</p>
				2584
				2585	<p>For example using HSL, we have: ... <kbd>-colorspace HSL -channel lightness -equalize -colorspace RGB</kbd> ...</p>
				2586
				2587	<p>For YIQ, YUV and OHTA use the red channel. For example, OHTA is a principal components transformation that puts most of the information in the first channel. Here we have ... <kbd>-colorspace OHTA -channel red -equalize -colorspace RGB</kbd> ...</p>
				2588
				2589	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2590	<h4><a id="evaluate"></a>-evaluate <em class="arg">operator value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2591	</div>
				2592
				2593	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Alter channel pixels by evaluating an arithmetic, relational, or logical expression.</td><td style='text-align:right;'></td></tr></table>
				2594
				2595	<p>(See the <a href="#function" >-function</a> operator for some multi-parameter functions. See the <a href="#fx" >-fx</a> operator if more elaborate calculations are needed.)</p>
				2596
				2597	<p>The behaviors of each <em class="arg">operator</em> are summarized in the following list. For brevity, the numerical value of a "pixel" referred to below is the value of the corresponding channel of that pixel, while a "normalized pixel" is that number divided by the maximum (installation-dependent) value <em class="QR">QuantumRange</em>. (If normalized pixels are used, they are restored, following the other calculations, to the full range by multiplying by <em class="QR">QuantumRange</em>.)</p>
				2598
				2599	<table class="doc">
				2600	<col width="25%" />
				2601	<col width="75%" />
				2602	<thead>
				2603	<tr>
				2604	<th><em class="arg">operator</em></th>
				2605	<th>Summary (see further below for details)</th>
				2606	</tr>
				2607	</thead>
				2608	<tbody>
				2609
cristy	3c98a4f	2010-08-13 20:09:41 +0000	[diff] [blame]	2610	<tr><td>Abs </td> <td>Add <em class="arg">value</em> to pixels and return absolute value. </td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2611	<tr><td>Add </td> <td>Add <em class="arg">value</em> to pixels. </td></tr>
				2612	<tr><td>AddModulus </td> <td>Add <em class="arg">value</em> to pixels modulo <em class="QR">QuantumRange</em>.</td></tr>
				2613	<tr><td>And </td> <td>Binary AND of pixels with <em class="arg">value</em>.</td></tr>
				2614	<tr><td>Cos, Cosine </td> <td>Apply cosine to pixels with frequency <em class="arg">value</em> with 50% bias added.</td></tr>
				2615	<tr><td>Divide </td> <td>Divide pixels by <em class="arg">value</em>.</td></tr>
cristy	5063d81	2010-10-19 16:28:10 +0000	[diff] [blame]	2616	<tr><td>Exp </td> <td>base-e exponential function</td></tr>
				2617	<tr><td>Exponential </td> <td>base-e exponential function</td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2618	<tr><td>LeftShift </td> <td>Shift the pixel values left by <em class="arg">value</em> bits (i.e., multiply pixels by 2<sup><em class="arg">value</em></sup>).</td></tr>
				2619	<tr><td>Log </td> <td>Apply scaled logarithm to normalized pixels.</td></tr>
				2620	<tr><td>Max </td> <td>Clip pixels at lower bound <em class="arg">value</em>.</td></tr>
cristy	63fed27	2010-03-07 19:08:45 +0000	[diff] [blame]	2621	<tr><td>Mean </td> <td>Add the <em class="arg">value</em> and divide by 2.</td></tr>
cristy	61365ad	2010-11-28 02:38:34 +0000	[diff] [blame]	2622	<tr><td>Median </td> <td>Choose the median value from an image sequence.</td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2623	<tr><td>Min </td> <td>Clip pixels at upper bound <em class="arg">value</em>.</td></tr>
				2624	<tr><td>Multiply </td> <td>Multiply pixels by <em class="arg">value</em>.</td></tr>
				2625	<tr><td>Or </td> <td>Binary OR of pixels with <em class="arg">value</em>.</td></tr>
				2626	<tr><td>Pow </td> <td>Raise normalized pixels to the power <em class="arg">value</em>.</td></tr>
				2627	<tr><td>RightShift </td> <td>Shift the pixel values right by <em class="arg">value</em> bits (i.e., divide pixels by 2<sup><em class="arg">value</em></sup>).</td></tr>
				2628	<tr><td>Set </td> <td>Set pixel equal to <em class="arg">value</em>.</td></tr>
				2629	<tr><td>Sin, Sine </td> <td>Apply sine to pixels with frequency <em class="arg">value</em> with 50% bias added.</td></tr>
				2630	<tr><td>Subtract </td> <td>Subtract <em class="arg">value</em> from pixels.</td></tr>
				2631	<tr><td>Xor </td> <td>Binary XOR of pixels with <em class="arg">value.</em></td></tr>
				2632
				2633	<tr><td> </td></tr>
				2634
				2635	<tr><td>Gaussian-noise</td></tr>
				2636	<tr><td>Impulse-noise</td></tr>
				2637	<tr><td>Laplacian-noise</td></tr>
				2638	<tr><td>Multiplicative-noise</td> <td>(These are equivalent to the corresponding <a href="#noise" >-noise</a> operators.)</td></tr>
				2639	<tr><td>PoissonNoise</td></tr>
				2640	<tr><td>Uniform-noise</td></tr>
				2641
				2642	<tr><td> </td></tr>
				2643
				2644	<tr><td>Threshold </td> <td>Threshold pixels larger than <em class="arg">value</em>.</td></tr>
				2645	<tr><td>ThresholdBlack </td> <td>Threshold pixels to zero values equal to or below <em class="arg">value</em>.</td></tr>
				2646	<tr><td>ThresholdWhite </td> <td>Threshold pixels to maximum values above <em class="arg">value</em>. </td></tr>
				2647	</tbody>
				2648	</table>
				2649
				2650	<p>The specified functions are applied only to each previously set <a
				2651	href="#channel" >-channel</a> in the image. If necessary, the results of the
				2652	calculations are truncated (clipped) to fit in the interval [0, <em
				2653	class="QR">QuantumRange</em>]. The transparency channel of the image is
				2654	represented as a 'alpha' values (0 = fully transparent), so, for example, a
				2655	<kbd>Divide</kbd> by 2 of the alpha channel will make the image
				2656	semi-transparent. Append the percent symbol '<kbd>%</kbd>' to specify a value
				2657	as a percentage of the <em class="QR">QuantumRange</em>.</p>
				2658
				2659	<p>To print a complete list of <a href="#evaluate">-evaluate</a> operators, use
				2660	<a href="#list">-list evaluate</a>.</p>
				2661
				2662	<p>The results of the <kbd>Add</kbd>, <kbd>Subtract</kbd> and
				2663	<kbd>Multiply</kbd> methods can also be achieved using either the <a
				2664	href="#level" >-level</a> or the <a href="#level" >+level</a> operator, with
				2665	appropriate argument, to linearly modify the overall range of color values.
				2666	Please note, however, that <a href="#level" >-level</a> treats transparency as
				2667	'matte' values (0 = opaque), while <a href="#level" >-evaluate</a> works with
				2668	'alpha' values.</p>
				2669
				2670	<p><kbd>AddModulus</kbd> has been added as of ImageMagick 6.4.8-4 and provides addition modulo the <em class="QR">QuantumRange</em>. It is therefore equivalent to <kbd>Add</kbd> unless the resulting pixel value is outside the interval [0, <em class="QR">QuantumRange</em>]. </p>
				2671
cristy	ce66ab1	2010-10-21 23:36:32 +0000	[diff] [blame]	2672	<p><kbd>Exp or Exponential</kbd> has been added as of ImageMagick 6.6.5-1 and works on normalized pixel values. The <em class="arg">value</em> used with <kbd>Exp</kbd> should be negative so as to produce a decaying exponential function. Non-negative values will always produce results larger unity and thus outside the interval [0, <em class="QR">QuantumRange</em>]. The formula is expressed below. </p>
				2673
				2674	<div style="text-align:center;">
				2675	exp(<em class="arg">value</em> × <b><em>u</em></b>)
				2676	</div>
				2677
				2678	<p> If the input image is squared, for example, using <a
				2679	href="#-function" >-function polynomial "2 0 0"</a>, then a decaying Gaussian function will be the result.</p>
				2680
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2681	<p><kbd>Log</kbd> has been added as of ImageMagick 6.4.2-1 and works on normalized pixel values. This a <em>scaled</em> log function. The <em class="arg">value</em> used with <kbd>Log</kbd> provides a <em>scaling factor</em> that adjusts the curvature in the graph of the log function. The formula applied to a normalized value <b><em>u</em></b> is below. </p>
				2682
				2683	<div style="text-align:center;">
				2684	log(<em class="arg">value</em> × <b><em>u</em></b> + 1) / log(<em class="arg">value</em> + 1)
				2685	</div>
				2686
				2687	<p><kbd>Pow</kbd> has been added as of ImageMagick 6.4.1-9, and works on
				2688	normalized pixel values. Note that <kbd>Pow</kbd> is related to the <a
				2689	href="#gamma" >-gamma</a> operator. For example, <b>-gamma 2</b> is equivalent
				2690	to <b>-evaluate pow 0.5</b>, i.e., a 'square root' function. The value used
				2691	with <a href="#gamma" >-gamma</a> is simply the reciprocal of the value used
				2692	with <kbd>Pow</kbd>.</p>
				2693
				2694	<p><kbd>Cosine</kbd> and <kbd>Sine</kbd> was added as of IM v6.4.8-8 and
				2695	converts the image values into a value according to a (co)sine wave function.
				2696	The synonyms <kbd>Cos</kbd> and <kbd>Sin</kbd> may also be used. The output
				2697	is biased 50% and normalized by 50% so as to fit in the respective color value
				2698	range. The <em class="arg">value</em> scaling of the <em>period</em> of the
				2699	function (its frequency), and thus determines the number of 'waves' that will
				2700	be generated over the input color range. For example, if the <em
				2701	class="arg">value</em> is 1, the effective period is simply the <em
				2702	class="QR">QuantumRange</em>; but if the <em class="arg">value</em> is 2,
				2703	then the effective period is the <em>half</em> the <em
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2704	class="QR">QuantumRange</em>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2705
				2706	<div style="text-align:center;">
				2707	0.5 + 0.5 × cos(2 π <b><em>u</em></b> × <em class="arg">value</em>).
				2708	</div>
				2709
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2710	<p>See also the <a href="#function" >-function</a> operator, which is a
				2711	multi-value version of evaluate. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2712
cristy	63fed27	2010-03-07 19:08:45 +0000	[diff] [blame]	2713	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2714	<h4><a id="evaluate-sequence"></a>-evaluate-sequence <em class="arg">operator</em></h4>
cristy	63fed27	2010-03-07 19:08:45 +0000	[diff] [blame]	2715	</div>
				2716
				2717	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Alter channel pixels by evaluating an arithmetic, relational, or logical expression over a sequence of images.</td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2718
				2719	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2720	<h4><a id="extent"></a>-extent <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2721	</div>
				2722
				2723	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the image size and offset.</td><td style='text-align:right;'></td></tr></table>
				2724
cristy	3e2860c	2010-01-24 01:36:30 +0000	[diff] [blame]	2725	<p>If the image is enlarged, unfilled areas are set to the background color. To position the image, use offsets in the <em class="arg">geometry</em> specification or precede with a <a href="#gravity">-gravity</a> setting. To specify how to compose the image with the background, use <a href="#compose" >-compose</a>.</p>
cristy	549177c	2010-11-11 13:51:21 +0000	[diff] [blame]	2726	<p>This command reduces or expands a JPEG image to fit on an 800x600
				2727	display. If the aspect ratio of the input image isn't exactly 4:3, then the
				2728	image is centered on an 800x600 black canvas: </p>
				2729
				2730	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert input.jpg -resize 800x600 -background black -compose Copy \ <br /> -gravity center -extent 800x600 -quality 92 output.jpg</span></p>
				2731
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2732
				2733	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				2734
				2735	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2736	<h4><a id="extract"></a>-extract <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2737	</div>
				2738
				2739	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Extract the specified area from image.</td><td style='text-align:right;'></td></tr></table>
				2740
				2741	<p>This option is most useful for extracting a subregion of a very large raw image. Note that these two commands are equivalent:</p>
				2742
cristy	4949d52	2010-03-12 18:41:34 +0000	[diff] [blame]	2743	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert -size 16000x16000 -depth 8 -extract 640x480+1280+960 \ <br/> image.rgb image.png</span><span class='crtout'></span><span class="crtprompt"> $magick> </span><span class='crtin'>convert -size 16000x16000 -depth 8 'image.rgb[640x480+1280+960]' \ <br/> image.rgb image.png</span></p><p>If you omit the offsets, as in</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2744
cristy	4949d52	2010-03-12 18:41:34 +0000	[diff] [blame]	2745	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert -size 16000x16000 -depth 8 -extract 640x480 \ <br/> image.rgb image.png</span></p>
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2746	<p>the image is <em>resized</em> to the specified dimensions instead,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2747	equivalent to:</p>
				2748
				2749	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert -size 16000x16000 -depth 8 -resize 640x480 image.rgb image.png</span></p>
				2750	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				2751
				2752	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2753	<h4><a id="family"></a>-family <em class="arg">fontFamily</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2754	</div>
				2755
				2756	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set a font family for text.</td><td style='text-align:right;'></td></tr></table>
				2757
				2758	<p>This setting suggests a font family that ImageMagick should try to use for rendering text. If the family can be found it is used; if not, a default font (e.g., "Arial") or a family known to be similar is substituted (e.g., "Courier" might be used if "System" is requested but not found).
				2759	</p>
				2760
				2761	<p>For other settings that affect fonts, see the options <a href="#font">-font</a>, <a href="#stretch">-stretch</a>, <a href="#style">-style</a>, and <a href="#weight">-weight</a>.
				2762	</p>
				2763
				2764	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2765	<h4><a id="features"></a>-features <em class="arg">distance</em></h4>
cristy	7396d88	2010-01-27 02:37:56 +0000	[diff] [blame]	2766	</div>
				2767
				2768	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>display features for each channel in the image in each of four directions (horizontal, vertical, left and right diagonals) for the specified distance.</td><td style='text-align:right;'></td></tr></table>
				2769
				2770	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2771	<h4><a id="fft"></a>-fft</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2772	</div>
				2773
				2774	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>implements the forward discrete Fourier transform (DFT).</td><td style='text-align:right;'></td></tr></table>
				2775
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2776	<p>This option is new as of ImageMagick 6.5.4-3 (and now working for Windows users in ImageMagick 6.6.0-9). It transforms an image from the normal (spatial) domain to the frequency domain. In the frequency domain, an image is represented as a superposition of complex sinusoidal waves of varying amplitudes. The image x and y coordinates are the possible frequencies along the x and y directions, respectively, and the pixel intensity values are complex numbers that correspond to the sinusoidal wave amplitudes. See for example, <a href="http://en.wikipedia.org/wiki/Fourier_transform">Fourier Transform</a>, <a href="http://en.wikipedia.org/wiki/DFT">Discrete Fourier Transform</a> and <a href="http://en.wikipedia.org/wiki/FFT">Fast Fourier Transform</a>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2777
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2778	<p>A single image name is provided as output for this option. However, the output result will have two components. It is either a two-frame image or two separate images, depending upon whether the image format specified supports multi-frame images. The reason that we get a dual output result is because the frequency domain represents an image using complex numbers, which cannot be visualized directly. Therefore, the complex values are automagically separated into a two-component image representation. The first component is the magnitude of the complex number and the second is the phase of the complex number. See for example, <a href="http://en.wikipedia.org/wiki/Complex_numbers">Complex Numbers</a>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2779
				2780	<p>The magnitude and phase component images must be specified using image formats that do not limit the color or compress the image. Thus, MIFF, TIF, PFM, EXR and PNG are the recommended image formats to use. All of these formats, except PNG support multi-frame images. So for example,</p>
				2781
				2782	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert image.png -fft fft_image.miff</span></p>
				2783	<p>generates a magnitude image as <kbd>fft_image.miff[0]</kbd> and a phase image as <kbd>fft_image.miff[1]</kbd>. Similarly,</p>
				2784
				2785	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert image.png -fft fft_image.png</span></p>
				2786	<p>generates a magnitude image as <kbd>fft_image-0.png</kbd> and a phase image as <kbd>fft_image-1.png</kbd>. If you prefer this representation, then you can force any of the other formats to produce two output images by including <a href="#adjoin">+adjoin</a> following -fft in the command line.</p>
				2787
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2788	<p>The input image can be any size, but if not square and even-dimensioned, it is padded automagically to the larger of the width or height of the input image and to an even number of pixels. The padding will occur at the bottom and/or right sides of the input image. The resulting output magnitude and phase images is square at this size. The kind of padding relies on the <a href="#virtual-pixel">-virtual-pixel</a> setting.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2789
				2790	<p>Both output components will have dynamic ranges that fit within [0, <em class="QR">QuantumRange</em>], so that HDRI need not be enabled. Phase values nominally range from 0 to 2*π, but for non-HDRI compilations of ImageMagick, the phase image is scaled to span the full dynamic range. The magnitude image is not scaled and thus generally will contain very small values. As such, the image normally will appear totally black. In order to view any detail, the magnitude image typically is enhanced with a log function into what is usually called the spectrum. A log function is used to enhance the darker values more in comparison to the lighter values. This can be done, for example, as follows:</p>
				2791
				2792	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert fft_image.miff[0] -contrast-stretch 0 \ <br />
				2793	-evaluate log 1000 fft_image_spectrum.png</span></p>
				2794	<p>where the <a href="#contrast-stretch">-contrast-stretch</a> 0 is used to scale the image to full dynamic range, first. The argument to the <a href="#evaluate">-evaluate</a> log typically is specified between 100 and 10,000, depending upon the amount of detail that one wants to bring out in the spectrum. Larger values produce more visible detail. Too much detail, however, may hide the important features.</p>
				2795
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2796	<p>The <a href="http://www.fftw.org/">FFTW</a> delegate library is required to use <a href="#fft">-fft</a>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2797
				2798	<p>Use <a href="#fft">+fft</a> to produce two output images that are the real and imaginary components of the complex valued Fourier transform.</p>
				2799
				2800	<p>However, as the real and imaginary components can contain negative values, this requires that IM be configured with HDRI enabled. In this case, you must use either MIFF, TIF or PFM formats for the real and imaginary component results, since they are formats that preserve both negative and fractional values without clipping them or truncating the fractional part.</p>
				2801
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2802	<p>The real and imaginary component images resulting from <a href="#fft">+fft</a> is also square, even dimensioned images due to the same padding that was discussed above for the magnitude and phase component images.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2803
				2804	<p>See the discussion on HDRI implementations of ImageMagick on the page
				2805	<a href="/www/high-dynamic-range.html">High Dynamic-Range Images</a>. For more about HDRI go the ImageMagick <a href="http://www.imagemagick.org/Usage/basics/#hdri">Usage</a> pages or this <a href="http://en.wikipedia.org/wiki/High_dynamic_range_imaging">Wikipedia</a> entry.
				2806	</p>
				2807
				2808
				2809	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2810	<h4><a id="fill"></a>-fill <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2811	</div>
				2812
				2813	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>color to use when filling a graphic primitive.</td><td style='text-align:right;'></td></tr></table>
				2814
				2815	<p>This option accepts a color name, a hex color, or a numerical RGB, RGBA, HSL, HSLA, CMYK, or CMYKA specification. See <a href="../www/color.html">Color Names</a> for a description of how to properly specify the color argument.</p>
				2816
				2817	<p>Enclose the color specification in quotation marks to prevent the "#" or the parentheses from being interpreted by your shell.</p>
				2818
				2819	<p>For example,</p>
				2820
				2821	<p class="crtsnip">
				2822	-fill blue
				2823	</p>
				2824	<p class="crtsnip">
				2825	-fill "#ddddff"
				2826	</p>
				2827	<p class="crtsnip">
				2828	-fill "rgb(255,255,255)"
				2829	</p>
				2830
				2831	<p>See <a href="#draw">-draw</a> for further details.</p>
				2832
				2833	<p>To print a complete list of color names, use the <a href="#list">-list color</a> option.</p>
				2834
				2835	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2836	<h4><a id="filter"></a>-filter <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2837	</div>
				2838
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2839	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Use this <em class="arg">type</em> of filter when resizing or
				2840	distorting an image.</td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2841
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2842	<p>Use this option to affect the resizing operation of an image during
				2843	operations such as <a href="#resize">-resize</a> and <a href="#distort"
				2844	>-distort</a>. For example you can use a simple resize filter such as:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2845
				2846	<pre class="text">
				2847	Point Hermite Cubic
				2848	Box Gaussian Catrom
				2849	Triangle Quadratic Mitchell
				2850	</pre>
				2851
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2852	<p>The <kbd>Bessel</kbd> and <kbd>Sinc</kbd> filter is also provided (as well
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2853	as a faster <kbd>SincFast</kbd> equivalent form). However these filters are
				2854	generally useless on their own as they are infinite filters that are being
				2855	clipped to the filters support size. Their direct use is not recommended
				2856	except via expert settings (see below). </p>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2857
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2858	<p>Instead these special filter functions are typically windowed by a windowing
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2859	function that the <a href="#filter" >-filter</a> setting defines. That is
				2860	using these functions will define a 'Windowed' filter, appropriate to the
				2861	operator involved. Windowed filters include: </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2862
				2863	<pre class="text">
				2864	Lanczos Hamming Parzen
				2865	Blackman Kaiser Welsh
				2866	Hanning Bartlett Bohman
				2867	</pre>
				2868
				2869	<p>Also one special self-windowing filter is also provided
				2870	<kbd>Lagrange</kbd>, which will automagically re-adjust its function depending
				2871	on the current 'support' or 'lobes' expert settings (see below).</p>
				2872
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2873	<p>If you do not select a filter with this option, the filter defaults to
				2874	<kbd>Mitchell</kbd> for a colormapped image, a image with a matte channel, or
				2875	if the image is enlarged. Otherwise the filter default to
				2876	<kbd>Lanczos</kbd>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2877
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2878	<p>To print a complete list of resize filters, use the <a href="#list">-list
				2879	filter</a> option.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2880
				2881	<p>You can modify how the filter behaves as it scales your image through the
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2882	use of these expert settings (see also <a href="#define" >-define</a> and <a
				2883	href="#set" >-set</a>):-</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2884
				2885	<dl class="doc">
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2886	<dt>-define filter:blur=<em>factor</em></dt>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2887	<dd>Scale the X axis of the filter (and its window). Use > 1.0 for
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2888	blurry or < 1.0 for sharp. This should only be used with Gaussian and
				2889	Gaussian-like filters simple filters, or you may not get the expected
				2890	results. </dd>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2891
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2892	<dt>-define filter:support=<em>radius</em></dt>
				2893	<dd>Set the filter support radius. Defines how large the filter should be and
				2894	thus directly defines how slow the filtered resampling process is. All
				2895	filters have a default 'prefered' support size. Some filters like
				2896	<kbd>Lagrange</kbd> and windowed filters adjust themselves depending on
				2897	this value. With simple filters this value either does nothing (but slow
				2898	the resampling), or will clip the filter function in a detrimental way.
				2899	</dd>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2900
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2901	<dt>-define filter:lobes=<em>count</em></dt>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2902	<dd>Set the number of lobes to use for the Sinc/Bessel filter. This an
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2903	alternative way of specifying the 'support' range of the filter, that is
				2904	designed to be more suited to windowed filters, especially when used for
				2905	image distorts.</dd>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2906
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2907	<dt>-define filter:b=<em>b-spline_factor</em></dt>
				2908	<dt>-define filter:c=<em>keys_alpha_factor</em></dt>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2909	<dd>Redefine the values used for cubic filters such as <kbd>Cubic</kbd>,
				2910	<kbd>Catrom</kbd>, <kbd>Mitchel</kbd>, and <kbd>Hermite</kbd>, as well as
				2911	the <kbd>Parzen</kbd> Sinc windowing function. If only one of the values
				2912	are defined, the other is set so as to generate a 'Keys' type cubic
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2913	filter. Values meaning was defined by a research paper by
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2914	Mitchell-Netravali.</dd>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2915
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2916	<dt>-define filter:filter=<em>filter_function</em></dt>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2917	<dd>Use this function directly as the scaling filter. This will allow
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2918	you to directly use a windowing filter such as <kbd>Blackman</kbd>,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2919	rather than as its normal usage as a windowing function for 'Sinc' or
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2920	'Bessel' functions. If defined, no windowing function is used, unless the
				2921	following expert setting is also defined.</dd>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2922
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2923	<dt>-define filter:window=<em>filter_function</em></dt>
				2924	<dd>The IIR (infinite impulse response) filters <kbd>Bessel</kbd> and
				2925	<kbd>Sinc</kbd> are windowed (brought down to zero over the defined
				2926	support range) with the given filter. This allows you to specify a filter
				2927	function that is not normally used as a windowing function, such as
				2928	<kbd>Box</kbd>, (which effectively turns off the windowing function),
				2929	to window a <kbd>Sinc</kbd>, or the function the previous setting defined.
				2930	</dd>
				2931
				2932	<dt>-define filter:verbose=<em>1</em></dt>
				2933	<dd>This causes IM to print information on the final internal filter
				2934	selection to standard output. This includes a commented header on the
				2935	filter settings being used, and data allowing the filter weights to be
				2936	easily graphed. </dd>
				2937
				2938	<dd>Note however that some filters are internally defined in terms of other
				2939	filters. The <kbd>Lanczos</kbd> filter for example is defined in terms of
				2940	a <kbd>SincFast</kbd> windowed <kbd>SincFast</kbd> filter, while
				2941	<kbd>Mitchell</kbd> is defined as a <kbd>Cubic</kbd> filter with specific
				2942	'B' and 'C' settings. </dd>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2943
				2944	</dl>
				2945
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2946	<p>For example, to get a 8 lobe Bessel windowed Bessel filter:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2947
				2948	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert image.png -filter bessel \ <br/>
				2949	-set filter:window=bessel -set filter:lobes=8 \ <br/>
				2950	-resize 150% image.jpg</span></p>
				2951	<p>Or a raw un-windowed Sinc filter with 4 lobes:</p>
				2952
				2953	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert image.png -set filter:filter=sinc -set filter:lobes=4 \ <br/>
				2954	-resize 150% image.jpg</span></p>
				2955	<p>Note that the use of expert options (except for 'blur' with simple resize
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2956	filters, and 'verbose' for viewing the internal filter selection), are
				2957	provided for image processing experts who have studied and understood how
				2958	resize filters work. Without this knowledge, and an understanding of the
				2959	definition of the actual filters involved, using expert settings are more
				2960	likely to be detrimental to your image resizing.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2961
				2962
				2963	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2964	<h4><a id="flatten"></a>-flatten</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2965	</div>
				2966
				2967	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>This is a simple alias for the <a href="#layers" >-layers</a> method "flatten".</td><td style='text-align:right;'></td></tr></table>
				2968
				2969
				2970	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2971	<h4><a id="flip"></a>-flip</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2972	</div>
				2973
				2974	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>create a <em>mirror image</em>.</td><td style='text-align:right;'></td></tr></table>
				2975
				2976	<p>reflect the scanlines in the vertical direction.</p>
				2977
				2978	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2979	<h4><a id="floodfill"></a>-floodfill {<em class="arg">+-</em>}<em class="arg">x</em>{<em class="arg">+-</em>}<em class="arg">y</em> <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2980	</div>
				2981
				2982	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>floodfill the image with color at the specified offset. Using <a href="#fuzz" >-fuzz</a> to floodfill pixels which only change by a small amount.</td><td style='text-align:right;'></td></tr></table>
				2983
				2984	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2985	<h4><a id="flop"></a>-flop</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2986	</div>
				2987
				2988	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>create a <em>mirror image</em>.</td><td style='text-align:right;'></td></tr></table>
				2989
				2990	<p>reflect the scanlines in the horizontal direction.</p>
				2991
				2992
				2993	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2994	<h4><a id="font"></a>-font <em class="arg">name</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2995	</div>
				2996
				2997	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>set the font to use when annotating images with text, or creating labels.</td><td style='text-align:right;'></td></tr></table>
				2998
				2999	<p>To print a complete list of fonts, use the <a href="#list">-list font</a> option (for versions prior to 6.3.6, use 'type' instead of 'font').</p>
				3000
				3001	<p>In addition to the fonts specified by the above pre-defined list, you can
				3002	also specify a font from a specific source. For example <kbd>Arial.ttf</kbd>
				3003	is a TrueType font file, <kbd>ps:helvetica</kbd> is PostScript font, and
				3004	<kbd>x:fixed</kbd> is X11 font.</p>
				3005
				3006	<p>For other settings that affect fonts, see the options <a href="#family">-family</a>, <a href="#stretch">-stretch</a>, <a href="#style">-style</a>, and <a href="#weight">-weight</a>. </p>
				3007
				3008
				3009	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3010	<h4><a id="foreground"></a>-foreground <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3011	</div>
				3012
				3013	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Define the foreground color.</td><td style='text-align:right;'></td></tr></table>
				3014
				3015	<p>The color is specified using the format described under the <a href="#fill">-fill</a> option.</p>
				3016
				3017	<p>The default foreground color is black.</p>
				3018
				3019	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3020	<h4><a id="format"></a>-format <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3021	</div>
				3022
				3023	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>the image format type.</td><td style='text-align:right;'></td></tr></table>
				3024
				3025	<p>When used with the <kbd>mogrify</kbd> utility, this option converts any image to the image <a href="/www/formats.html">format</a> you specify. For a list of image format types supported by ImageMagick, use <a href="#list">-list format</a>.</p>
				3026
				3027	<p>By default the file is written to its original name. However, if the filename extension matches a supported format, the extension is replaced with the image format type specified with <a href="#format">-format</a>. For example, if you specify <em class="arg">tiff</em> as the format type and the input image filename is <em class="arg">image.gif</em>, the output image filename becomes <em class="arg">image.tiff</em>.</p>
				3028
				3029	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3030	<h4><a id="format_identify_"></a>-format <em class="arg">string</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3031	</div>
				3032
				3033	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>output formatted image characteristics.</td><td style='text-align:right;'>[<a href="../www/identify.html">identify</a>]</td></tr></table>
				3034
				3035	<p>See <a href="../www/escape.html">Format and Print Image Properties</a> for an explanation on how to specify the argument to this option.</p>
				3036
				3037	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3038	<h4><a id="frame"></a>-frame <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3039	</div>
				3040
				3041	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Surround the image with a border or beveled frame.</td><td style='text-align:right;'></td></tr></table>
				3042
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	3043	<p>The color of the border is specified with the <a href="#mattecolor"
				3044	>-mattecolor</a> command line option. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3045
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	3046	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument. The <em class="arg">size</em> portion of the <em
				3047	class="arg">geometry</em> argument indicates the amount of extra width and
				3048	height that is added to the dimensions of the image. If no offsets are given
				3049	in the <em class="arg">geometry</em> argument, then the border added is
				3050	a solid color. Offsets <em>x</em> and <em>y</em>, if present, specify that
				3051	the width and height of the border is partitioned to form an outer bevel of
				3052	thickness <em>x</em> pixels and an inner bevel of thickness
				3053	<em>y</em> pixels. Negative offsets make no sense as frame arguments.
				3054	</p>
				3055
				3056	<p>The <a href="#frame">-frame</a> option is affected by the current <a
				3057	href="#compose">-compose</a> setting and assumes that this is using the default
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3058	'<kbd>Over</kbd>' composition method. It generates a image of the appropriate
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	3059	size with the current <a href="#bordercolor">-bordercolor</a> setting, and then
				3060	draws the frame of four distinct colors close to the current <a
				3061	href="#mattecolor">-mattecolor</a>. The original image is then overlaid onto
				3062	center of this image. This means that with the default compose method of
				3063	'<kbd>Over</kbd>' any transparent parts may be replaced by the current <a
				3064	href="#bordercolor">-bordercolor</a> setting.</p>
				3065
				3066	<p>The image composition is not
				3067	affected by the <a href="#gravity">-gravity</a> option.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3068
				3069
				3070	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3071	<h4><a id="frame_import_"></a>-frame</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3072	</div>
				3073
				3074	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>include the X window frame in the imported image.</td><td style='text-align:right;'>[<a href="../www/import.html">import</a>]</td></tr></table>
				3075
				3076	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3077	<h4><a id="function"></a>-function <em class="arg">function</em> <em class="arg">parameters</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3078	</div>
				3079
				3080	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Apply a function to channel values.</td><td style='text-align:right;'></td></tr></table>
				3081
				3082	<p>This operator performs calculations based on the given arguments to modify each of the color values for each previously set <a href="#channel">-channel</a> in the image. See <a href="#evaluate">-evaluate</a> for details concerning how the results of the calculations are handled.</p>
				3083
				3084	<p>This is can be considered a multi-argument version of the <a href="#evaluate">-evaluate</a> operator. (Added in ImageMagick 6.4.8−8.)</p>
				3085
				3086	<p>Here, <em class="arg">parameters</em> is a comma-separated list of numerical values. The number of values varies depending on which <em class="arg">function</em> is selected. Choose the <em class="arg">function</em> from:</p>
				3087
				3088	<pre class="text">
				3089	Polynomial
				3090	Sinusoid
				3091	Arcsin
				3092	Arctan
				3093	</pre>
				3094
				3095	<p>To print a complete list of <a href="#function">-function</a> operators, use <a href="#list">-list function</a>. Descriptions follow.</p>
				3096
				3097	<dl class="doc">
				3098	<dt><kbd>Polynomial</kbd></dt>
				3099	<dd>
				3100	<p>The <kbd>Polynomial</kbd> function takes an arbitrary number of parameters, these being the coefficients of a polynomial, in decreasing order of degree. That is, entering</p>
				3101
				3102	<div style="text-align: center">
				3103	-function Polynomial <em>a</em><sub><em>n</em></sub>,<em>a</em><sub><em>n</em>-1</sub>,...<em>a</em><sub>1</sub>,<em>a</em><sub>0</sub>
				3104	</div>
				3105
				3106	<p>will invoke a polynomial function given by</p>
				3107
				3108	<div style="text-align: center">
				3109	<em>a</em><sub><em>n</em></sub> <b><em>u</em></b><sup><em>n</em></sup> +
				3110	<em>a</em><sub><em>n</em>-1</sub> <b><em>u</em></b><sup><em>n</em>-1</sup> +
				3111	··· <em>a</em><sub>1</sub> <b><em>u</em></b> + <em>a</em><sub>0</sub>,
				3112	</div>
				3113
				3114	<p>where <b><em>u</em></b> is pixel's original normalized channel value.</p>
				3115
				3116	<p>The <kbd>Polynomial</kbd> function can be used in place of <kbd>Set</kbd> (the <em>constant</em> polynomial) and <kbd>Add</kbd>, <kbd>Divide</kbd>, <kbd>Multiply</kbd>, and <kbd>Subtract</kbd> (some <em>linear</em> polynomials) of the <a href="#evaluate">-evaluate</a> operator. The <a href="#level">-level</a> operator also affects channels linearly. Some correspondences follow.</p>
				3117
				3118	<table class="doc">
				3119	<col width="35%" />
				3120	<col width="35%" />
				3121	<col width="30%" />
				3122	<tr>
				3123	<td>-evaluate Set <em class="arg">value</em> </td>
				3124	<td>-function Polynomial <em class="arg">value</em></td>
				3125	<td>(Constant functions; set <em class="arg">value</em>×100% gray when channels are RGB.)</td>
				3126	</tr>
				3127	<tr>
				3128	<td>-evaluate Add <em class="arg">value</em> </td>
				3129	<td>-function Polynomial 1,<em class="arg">value</em></td>
				3130	</tr>
				3131	<tr>
				3132	<td>-evaluate Subtract <em class="arg">value</em> </td>
				3133	<td>-function Polynomial 1,−<em class="arg">value</em></td>
				3134	</tr>
				3135	<tr>
				3136	<td>-evaluate Multiply <em class="arg">value</em> </td>
				3137	<td>-function Polynomial <em class="arg">value</em>,0</td>
				3138	</tr>
				3139	<tr>
				3140	<td>+level black% x white%</td>
				3141	<td>-function Polynomial A,B</td>
				3142	<td>(Reduce contrast. Here, A=(white-black)/100 and B=black/100.)</td>
				3143	</tr>
				3144	</table>
				3145
				3146	<p>The <kbd>Polynomial</kbd> function gives great versatility, since polynomials can be used to fit any continuous curve to any degree of accuracy desired.</p>
				3147	</dd>
				3148
				3149	<dt><kbd>Sinusoid</kbd></dt>
				3150	<dd>
				3151	<p>The <kbd>Sinusoid</kbd> function can be used to vary the channel values sinusoidally by setting frequency, phase shift, amplitude, and a bias. These values are given as one to four parameters, as follows,</p>
				3152
				3153	<div style="text-align: center">
				3154	-function <kbd>Sinusoid</kbd> <em class="arg">freq</em>,[<em class="arg">phase</em>,[<em class="arg">amp</em>,[<em class="arg">bias</em>]]]
				3155	</div>
				3156
				3157	<p>where <em>phase</em> is in degrees. (The domain [0,1] of the function corresponds to 0 through <em class="arg">freq</em>×360 degrees.) The result is that if a pixel's normalized channel value is originally <b><em>u</em></b>, its resulting normalized value is given by </p>
				3158
				3159	<div style="text-align: center">
				3160	<em class="arg">amp</em> * sin(2π (<em class="arg">freq</em> * <b><em>u</em></b> + <em class="arg">phase</em> / 360)) + <em class="arg">bias</em>
				3161	</div>
				3162
				3163	<p> For example, the following generates a curve that starts and ends at 0.9 (when <b><em>u</em></b>=0 and 1, resp.), oscillating three times between .7−.2=.5 and .7+.2=.9. </p>
				3164
				3165	<p class="crtsnip">
				3166	-function Sinusoid 3,-90,.2,.7
				3167	</p>
				3168
				3169	<p>The default values of <em class="arg">amp</em> and <em class="arg">bias</em> are both .5. The default for <em class="arg">phase</em> is 0.</p>
				3170
				3171	<p>The <kbd>Sinusoid</kbd> function generalizes <kbd>Sin</kbd> and <kbd>Cos</kbd> of the <a href="#evaluate">-evaluate</a> operator by allowing varying amplitude, phase and bias. The correspondence is as follows.</p>
				3172
				3173	<table class="doc">
				3174	<tr>
				3175	<td>-evaluate Sin <em class="arg">freq</em> </td>
				3176	<td>-function Sinusoid <em class="arg">freq</em>,0 </td>
				3177	</tr>
				3178	<tr>
				3179	<td>-evaluate Cos <em class="arg">freq</em> </td>
				3180	<td>-function Sinusoid <em class="arg">freq</em>,90 </td>
				3181	</tr>
				3182	</table>
				3183	</dd>
				3184
				3185	<dt><kbd>ArcSin</kbd></dt>
				3186	<dd>
				3187	<p>The <kbd>ArcSin</kbd> function generates the inverse curve of a Sinusoid,
				3188	and can be used to generate cylindrical distortion and displacement maps.
				3189	The curve can be adjusted relative to both the input values and output range
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3190	of values.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3191
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3192	<p style="text-align: center">
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3193	-function <kbd>ArcSin</kbd> <em class="arg">width</em>,[<em class="arg">center</em>,[<em class="arg">range</em>,[<em class="arg">bias</em>]]]
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3194	</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3195
				3196	<p>with all values given in terms of noramlize color values (0.0 for black,
				3197	1.0 for white). Defaulting to values covering the full range from 0.0 to 1.0
				3198	for bout input (<em class="arg">width</em>), and output (<em
				3199	class="arg">width</em>) values. '<code>1.0,0.5,1.0,0.5</code>' </p>
				3200
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3201	<p style="text-align: center">
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3202	<em class="arg">range</em>/π * asin( 2/<em class="arg">width</em> * ( <b><em>u</em></b> - <em class="arg">center</em> ) ) + <em class="arg">bias</em>
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3203	</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3204
				3205	</dd>
				3206
				3207	<dt><kbd>ArcTan</kbd></dt>
				3208	<dd>
				3209	<p>The <kbd>ArcTan</kbd> function generates a curve that smooth crosses from
				3210	limit values at infinities, though a center using the given slope value.
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3211	All these values can be adjusted via the arguments.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3212
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3213	<p style="text-align: center">
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3214	-function <kbd>ArcTan</kbd> <em class="arg">slope</em>,[<em class="arg">center</em>,[<em class="arg">range</em>,[<em class="arg">bias</em>]]]
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3215	</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3216
				3217	<p>Defaulting to '<code>1.0,0.5,1.0,0.5</code>'.
				3218	</p>
				3219
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3220	<p style="text-align: center">
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3221	<em class="arg">range</em>/π * atan( <em class="arg">slope</em>π ( <b><em>u</em></b> - <em class="arg">center</em> ) ) + <em class="arg">bias</em>
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3222	</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3223
				3224	</dd>
				3225
				3226	</dl>
				3227
				3228
				3229	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3230	<h4><a id="fuzz"></a>-fuzz <em class="arg">distance</em>{<em class="arg">%</em>}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3231	</div>
				3232
				3233	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Colors within this <em class="arg">distance</em> are considered equal.</td><td style='text-align:right;'></td></tr></table>
				3234
				3235	<p>A number of algorithms search for a target color. By default the color must be exact. Use this option to match colors that are close to the target color in RGB space. For example, if you want to automagically trim the edges of an image with <a href="#trim">-trim</a> but the image was scanned and the target background color may differ by a small amount. This option can account for these differences.</p>
				3236
				3237	<p>The <em class="arg">distance</em> can be in absolute intensity units or, by appending <kbd>%</kbd> as a percentage of the maximum possible intensity (255, 65535, or 4294967295).</p>
				3238
				3239
				3240	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3241	<h4><a id="fx"></a>-fx <em class="arg">expression</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3242	</div>
				3243
				3244	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>apply a mathematical expression to an image or image channels.</td><td style='text-align:right;'></td></tr></table>
				3245
				3246	<p>If the first character of <em class="arg">expression</em> is <kbd>@</kbd>, the expression is read from a file titled by the remaining characters in the string.</p>
				3247
				3248	<p>See <a href="../www/fx.html">FX, The Special Effects Image Operator</a> for a detailed discussion of this option.</p>
				3249
				3250
				3251	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3252	<h4><a id="gamma"></a>-gamma <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3253	</div>
				3254
				3255	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>level of gamma correction.</td><td style='text-align:right;'></td></tr></table>
				3256
				3257	<p>The same color image displayed on two different workstations may look different due to differences in the display monitor. Use gamma correction to adjust for this color difference. Reasonable values extend from <kbd>0.8</kbd> to <kbd>2.3</kbd>. Gamma less than 1.0 darkens the image and gamma greater than 1.0 lightens it. Large adjustments to image gamma may result in the loss of some image information if the pixel quantum size is only eight bits (quantum range 0 to 255).</p>
				3258
				3259	<p>Gamma adjusts the image's channel values pixel-by-pixel according to a power law, namely, pow(pixel,1/gamma) or pixel^(1/gamma), where pixel is the normalized or 0 to 1 color value. For example, using a value of gamma=2 is the same as taking the square root of the image.</p>
				3260
				3261	<p>You can apply separate gamma values to the red, green, and blue channels of the image with a gamma value list delimited with commas (e.g., <kbd>1.7,2.3,1.2</kbd>).</p>
				3262
				3263	<p>Use <a href="#gamma">+gamma <em class="arg">value</em></a> to set the image gamma level without actually adjusting the image pixels. This option is useful if the image is of a known gamma but not set as an image attribute (e.g. PNG images).</p>
				3264
				3265	<p>Note that gamma adjustments are also available via the <a href="#level">-level</a> operator.</p>
				3266
				3267	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3268	<h4><a id="gaussian-blur"></a>-gaussian-blur <em class="arg">radius</em><br />-gaussian-blur <em class="arg">radius</em>x<em class="arg">sigma</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3269	</div>
				3270
				3271	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Blur the image with a Gaussian operator.</td><td style='text-align:right;'></td></tr></table>
				3272
cristy	b15553d	2010-07-03 22:53:14 +0000	[diff] [blame]	3273	<p>Convolve the image with a Gaussian or normal distribution using the given
				3274	<em class="arg" >Sigma</em> value. The formula is:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3275
				3276	<div class="eqn"><img alt="gaussian distribution" width="243px" height="42px" src="../images/gaussian-blur.png"/>
				3277	</div>
				3278
cristy	b15553d	2010-07-03 22:53:14 +0000	[diff] [blame]	3279	<p>The <em class="arg" >Sigma</em> value is the important argument, and
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	3280	determines the actual amount of blurring that will take place. </p>
cristy	b15553d	2010-07-03 22:53:14 +0000	[diff] [blame]	3281
				3282	<p>The <em class="arg" >Radius</em> is only used to determine the size of the
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	3283	array which will hold the calculated Gaussian distribution. It should be an
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3284	integer. If not given, or set to zero, IM will calculate the largest possible
cristy	b15553d	2010-07-03 22:53:14 +0000	[diff] [blame]	3285	radius that will provide meaningful results for the Gaussian distribution.
				3286	</p>
				3287
				3288	<p>The larger the <em class="arg" >Radius</em> the radius the slower the
				3289	operation is. However too small a <em class="arg" >Radius</em>, and sever
				3290	aliasing effects may result. As a guideline, <em class="arg" >Radius</em>
				3291	should be at least twice the <em class="arg" >Sigma</em> value, though three
				3292	times will produce a more accurite result. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3293
				3294	<p>This differs from the faster <a href="#blur">-blur</a> operator in that a
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3295	full 2-dimensional convolution is used to generate the weighted average of the
				3296	neighboring pixels. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3297
				3298	<p>The <a href="#virtual-pixel">-virtual-pixel</a> setting will determine how
				3299	pixels which are outside the image proper are blurred into the final result.
				3300	</p>
				3301
				3302
				3303	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3304	<h4><a id="geometry"></a>-geometry <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3305	</div>
				3306
				3307	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the preferred size and location of the image.</td><td style='text-align:right;'></td></tr></table>
				3308
				3309	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				3310
				3311	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3312	<h4><a id="gravity"></a>-gravity <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3313	</div>
				3314
				3315	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Sets the current gravity suggestion for various other settings and options.</td><td style='text-align:right;'></td></tr></table>
				3316
				3317	<p>Choices include: <kbd>NorthWest</kbd>, <kbd>North</kbd>, <kbd>NorthEast</kbd>,
				3318	<kbd>West</kbd>, <kbd>Center</kbd>, <kbd>East</kbd>, <kbd>SouthWest</kbd>,
				3319	<kbd>South</kbd>, <kbd>SouthEast</kbd>. Use <a href="#list">-list gravity</a> to get a complete
				3320	list of <a href="#gravity">-gravity</a> settings available in your ImageMagick
				3321	installation.</p>
				3322
				3323	<p>The direction you choose specifies where to position text or subimages. For example, a gravity of <kbd>Center</kbd> forces the text to be centered within the image. By default, the image gravity is <kbd>NorthWest</kbd>. See <a href="#draw">-draw</a> for more details about graphic primitives. Only the text primitive of <a href="#draw">-draw</a> affected by the <a href="#gravity">-gravity</a> option.</p>
				3324
				3325	<p>The <a href="#gravity">-gravity</a> option is also used in concert with the <a href="#geometry">-geometry</a> setting and other settings or options that take <em class="arg">geometry</em> as an argument, such as the <a href="#crop">-crop</a> option. </p>
				3326
				3327	<p>If a <a href="#gravity">-gravity</a> setting occurs before another option or setting having a <em class="arg">geometry</em> argument that specifies an offset, the offset is usually applied to the point within the image suggested by the <a href="#gravity">-gravity</a> argument. Thus, in the following command, for example, suppose the file <kbd>image.png</kbd> has dimensions 200x100. The offset specified by the argument to <a href="#region">-region</a> is (−40,+20). The argument to <a href="#gravity">-gravity</a> is <kbd>Center</kbd>, which suggests the midpoint of the image, at the point (100,50). The offset (−40,20) is applied to that point, giving (100−40,50+20)=(60,70), so the specified 10x10 region is located at that point. (In addition, the <a href="#gravity">-gravity</a> affects the region itself, which is <em>centered</em> at the pixel coordinate (60,70). (See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.)</p>
				3328
cristy	4949d52	2010-03-12 18:41:34 +0000	[diff] [blame]	3329	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert image.png -gravity Center -region 10x10-40+20 \ <br/> -negate output.png</span></p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3330	<p>When used as an option to <a href="../www/composite.html">composite</a>, <a href="#gravity">-gravity</a> gives the direction that the image gravitates within the composite.</p>
				3331
				3332	<p>When used as an option to <a href="../www/montage.html">montage</a>, <a href="#gravity">-gravity</a> gives the direction that an image gravitates within a tile. The default gravity is <kbd>Center</kbd> for this purpose.</p>
				3333
				3334
				3335	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3336	<h4><a id="green-primary"></a>-green-primary <em class="arg">x,y</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3337	</div>
				3338
				3339	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>green chromaticity primary point.</td><td style='text-align:right;'></td></tr></table>
				3340
				3341
				3342	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3343	<h4><a id="hald-clut"></a>-hald-clut</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3344	</div>
				3345
				3346	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>apply a Hald color lookup table to the image.</td><td style='text-align:right;'></td></tr></table>
				3347
				3348	<p>A Hald color lookup table is a 3-dimensional color cube mapped to 2
				3349	dimensions. Create it with the <kbd>HALD:</kbd> prefix (e.g. HALD:8). You
				3350	can apply any color transformation to the Hald image and then use this option
				3351	to apply the transform to the image. </p>
				3352
				3353	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert image.png hald.png -hald-clut transform.png</span></p>
				3354	<p>This option provides a convenient method for you to use Gimp or Photoshop
				3355	to make color corrections to the Hald CLUT image and subsequently apply them
				3356	to multiple images using an ImageMagick script. </p>
				3357
				3358	<p>Note that the representation is only of the normal RGB color space and that
				3359	the whole color value triplet is used for the interpolated lookup of the
				3360	represented Hald color cube image. Because of this the operation is not <a
				3361	href="#channel" >-channel</a> setting effected, nor can it adjust or modify an
				3362	images transparency or alpha/matte channel.</p>
				3363
				3364	<p>See also <a href="#clut" >-clut</a> which provides color value replacement
				3365	of the individual color channels, usally involving a simplier gray-scale
				3366	image. E.g: gray-scale to color replacement, or modification by a histogram
				3367	mapping. </p>
				3368
				3369
				3370	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3371	<h4><a id="help"></a>-help</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3372	</div>
				3373
				3374	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>print usage instructions.</td><td style='text-align:right;'></td></tr></table>
				3375
				3376	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3377	<h4><a id="highlight-color"></a>-highlight-color <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3378	</div>
				3379
				3380	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>when comparing images, emphasize pixel differences with this color.</td><td style='text-align:right;'></td></tr></table>
				3381
				3382	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3383	<h4><a id="iconGeometry"></a>-iconGeometry <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3384	</div>
				3385
				3386	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>specify the icon geometry.</td><td style='text-align:right;'></td></tr></table>
				3387
				3388	<p>Offsets, if present in the geometry specification, are handled in the same manner as the <a href="#geometry">-geometry</a> option, using X11 style to handle negative offsets.</p>
				3389
				3390	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				3391
				3392	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3393	<h4><a id="iconic"></a>-iconic</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3394	</div>
				3395
				3396	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>iconic animation.</td><td style='text-align:right;'></td></tr></table>
				3397
				3398	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3399	<h4><a id="identify"></a>-identify</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3400	</div>
				3401
				3402	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>identify the format and characteristics of the image.</td><td style='text-align:right;'></td></tr></table>
				3403
				3404	<p>This information is printed: image scene number; image name; image size; the image class (<em class="arg">DirectClass</em> or <em class="arg">PseudoClass</em>); the total number of unique colors; and the number of seconds to read and transform the image. Refer to <a href="../www/miff.html">MIFF</a> for a description of the image class.</p>
				3405
				3406	<p>If <a href="#colors">-colors</a> is also specified, the total unique colors in the image and color reduction error values are printed. Refer to <a href="/www/quantize.html">color reduction algorithm</a> for a description of these values.</p>
				3407
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3408	<p>If <a href="#verbose">-verbose</a> precedes this option, copious
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3409	amounts of image properties are displayed including image statistics, profiles,
				3410	image histogram, and others.</p>
				3411
				3412	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3413	<h4><a id="ift"></a>-ift</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3414	</div>
				3415
				3416	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>implements the inverse discrete Fourier transform (DFT).</td><td style='text-align:right;'></td></tr></table>
				3417
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3418	<p>This option is new as of ImageMagick 6.5.4-3 (and now working for Windows users in ImageMagick 6.6.0-9). It transforms a pair of magnitude and phase images from the frequency domain to a single image in the normal or spatial domain. See for example, <a href="http://en.wikipedia.org/wiki/Fourier_transform">Fourier Transform</a>, <a href="http://en.wikipedia.org/wiki/DFT">Discrete Fourier Transform</a> and <a href="http://en.wikipedia.org/wiki/FFT">Fast Fourier Transform</a>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3419
				3420	<p>For example, depending upon the image format used to store the result of the <a href="#fft">-fft</a>, one would use either</p>
				3421
				3422	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert fft_image.miff -ift fft_image_ift.png</span></p>
				3423	<p>or</p>
				3424
				3425	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert fft_image-0.png fft_image-1.png -ift fft_image_ift.png</span></p>
				3426
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3427	<p>The resulting image may need to be cropped due to padding introduced when the original image, prior to the <a href="#fft">-fft</a> or <a href="#fft">+fft</a>, was not square or even dimensioned. Any padding is at the right and/or bottom sides of the image.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3428
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3429	<p>The <a href="http://www.fftw.org/">FFTW</a> delegate library is required to use <a href="#ift">-ift</a>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3430
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3431	<p>Use <a href="#ift">+ift</a> (with HDRI enabled) to transform a pair of real and imaginary images from the frequency domain to a single image in the normal (spatial) domain.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3432
				3433	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3434	<h4><a id="immutable"></a>-immutable</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3435	</div>
				3436
				3437	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>make image immutable.</td><td style='text-align:right;'></td></tr></table>
				3438
				3439	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3440	<h4><a id="implode"></a>-implode <em class="arg">factor</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3441	</div>
				3442
				3443	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>implode image pixels about the center.</td><td style='text-align:right;'></td></tr></table>
				3444
				3445	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3446	<h4><a id="insert"></a>-insert <em class="arg">index</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3447	</div>
				3448
				3449	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>insert the last image into the image sequence.</td><td style='text-align:right;'></td></tr></table>
				3450
				3451	<p>This option takes last image in the current image sequence and inserts it at the given index. If a negative index is used, the insert position is calculated before the last image is removed from the sequence. As such <kbd>-insert -1</kbd> will result in no change to the image sequence.</p>
				3452
				3453	<p>The <kbd>+insert</kbd> option is equivalent to <kbd>-insert -1</kbd>. In other words, insert the last image, at the end of the current image sequence. Consequently this has no effect on the image sequence order.</p>
				3454
				3455	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3456	<h4><a id="intent"></a>-intent <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3457	</div>
				3458
				3459	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>use this type of rendering intent when managing the image color.</td><td style='text-align:right;'></td></tr></table>
				3460
				3461	<p>Use this option to affect the color management operation of an image (see <a href="#profile">-profile</a>). Choose from these intents: <kbd>Absolute, Perceptual, Relative, Saturation</kbd>.</p>
				3462
				3463	<p>The default intent is undefined.</p>
				3464
				3465	<p>To print a complete list of rendering intents, use <a href="#list">-list intent</a>.</p>
				3466
				3467	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3468	<h4><a id="interlace"></a>-interlace <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3469	</div>
				3470
				3471	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>the type of interlacing scheme.</td><td style='text-align:right;'></td></tr></table>
				3472
				3473	<p>Choose from:</p>
				3474
				3475	<pre class="text">
				3476	none
				3477	line
				3478	plane
				3479	partition
				3480	JPEG
				3481	GIF
				3482	PNG
				3483	</pre>
				3484
				3485	<p>This option is used to specify the type of interlacing scheme for raw image formats such as <kbd>RGB</kbd> or <kbd>YUV</kbd>.</p>
				3486
				3487	<p><kbd>None</kbd> means do not interlace (RGBRGBRGBRGBRGBRGB...),</p>
				3488
				3489	<p><kbd>Line</kbd> uses scanline interlacing (RRR...GGG...BBB...RRR...GGG...BBB...), and.</p>
				3490
				3491	<p><kbd>Plane</kbd> uses plane interlacing (RRRRRR...GGGGGG...BBBBBB...).</p>
				3492
				3493	<p><kbd>Partition</kbd> is like plane except the different planes are saved to individual files (e.g. image.R,
				3494	image.G, and image.B).</p>
				3495
				3496	<p>Use <kbd>Line</kbd> or <kbd>Plane</kbd> to create an <kbd>interlaced PNG</kbd> or <kbd>GIF</kbd> or <kbd>progressive JPEG</kbd>
				3497	image.</p>
				3498
				3499	<p>To print a complete list of interlacing schemes, use <a href="#list">-list interlace</a>.</p>
				3500
				3501	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3502	<h4><a id="interpolate"></a>-interpolate <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3503	</div>
				3504
				3505	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the pixel color interpolation method to use when looking up a color based on a floating point or real value.</td><td style='text-align:right;'></td></tr></table>
				3506
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3507	<p>When looking up the color of a pixel using a non-integer floating point
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3508	value, you typically fall in between the pixel colors defined by the source
				3509	image. This setting determines how the color is determined from the colors of
				3510	the pixels surrounding that point. That is how to determine the color of a
				3511	point that falls between two, or even four different colored pixels. </p>
				3512
				3513	<pre class="text">
				3514	integer: The color of the top-left pixel (floor function)
				3515	nearest-neighbor: The nearest pixel to the lookup point (rounded function)
				3516	average: The average color of the surrounding four pixels
				3517	bilinear A double linear interpolation of pixels (the default)
				3518	mesh Divide area into two flat triangular interpolations
				3519	bicubic Fitted bicubic-spines of surrounding 16 pixels
				3520	spline Direct spline curves (colors are blurred)
				3521	filter Use resize <a href="#filter">-filter</a> settings
				3522	</pre>
				3523
				3524	<p>This most important for distortion operators such as <a href="#distort"
				3525	>-distort</a>, <a href="#implode" >-implode</a>, <a href="#transform"
				3526	>-transform</a> and <a href="#fx" >-fx</a>. </p>
				3527
				3528	<p>To print a complete list of interpolation methods, use <a href="#list">-list interpolate</a>.</p>
				3529
				3530	<p>See also <a href="#virtual-pixel" >-virtual-pixel</a>, for control of the
				3531	lookup for positions outside the boundaries of the image. </p>
				3532
				3533
				3534	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3535	<h4><a id="interline-spacing"></a>-interline-spacing <em class="arg">value</em></h4>
cristy	f3bb478	2009-09-08 13:10:04 +0000	[diff] [blame]	3536	</div>
				3537
				3538	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>the space between two text lines.</td><td style='text-align:right;'></td></tr></table>
				3539
				3540	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3541	<h4><a id="interword-spacing"></a>-interword-spacing <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3542	</div>
				3543
				3544	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>the space between two words.</td><td style='text-align:right;'></td></tr></table>
				3545
				3546	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3547	<h4><a id="kerning"></a>-kerning <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3548	</div>
				3549
				3550	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>the space between two letters.</td><td style='text-align:right;'></td></tr></table>
				3551
				3552	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3553	<h4><a id="label"></a>-label <em class="arg">name</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3554	</div>
				3555
				3556	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>assign a label to an image.</td><td style='text-align:right;'></td></tr></table>
				3557
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	3558	<p>Use this option to assign a specific label to the image, as it is read in
				3559	or created. You can use the <a href="#set" >-set</a> operation to re-assign
				3560	a the labels of images already read in. Image formats such as TIFF, PNG,
				3561	MIFF, supports saving the label information with the image.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3562
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	3563	<p>When saving an image to a <em class="arg">PostScript</em> file, any label
				3564	assigned to an image is used as a header string to print above the postscript
				3565	image. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3566
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	3567	<p>You can include the image filename, type, width, height, or other image
				3568	attribute by embedding special format character. See <a href="../www/escape.html">Format and Print Image
				3569	Properties</a> for details of the percent escape codes.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3570
				3571	<p>For example,</p>
				3572
				3573	<p class="crtsnip">
				3574	-label "%m:%f %wx%h" bird.miff
				3575	</p>
				3576
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	3577	<p>assigns an image label of <kbd>MIFF:bird.miff 512x480</kbd> to the
				3578	"<kbd>bird.miff</kbd>" image and whose width is 512 and height is 480, as it
				3579	is read in. If a <a href="#label">+label</a> option was used instead, any
				3580	existing label present in the image would be used. You can remove all labels
				3581	from an image by assigning the empty string. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3582
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	3583	<p>A label is not drawn on the image, but is embedded in the image datastream
				3584	via <em>Label</em> tag or similar mechanism. If you want the label to be
				3585	visible on the image itself, use the <a href="#draw">-draw</a> option, or
				3586	during the final processing in the creation of a image montage.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3587
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	3588	<p>If the first character of <em class="arg">string</em> is <em
				3589	class="arg">@</em>, the image label is read from a file titled by the
				3590	remaining characters in the string. Labels in a file are literal, no embedded
				3591	formatting characters are recognized.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3592
				3593
				3594	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3595	<h4><a id="lat"></a>-lat <em class="arg">width</em><br />-lat <em class="arg">width</em>x<em class="arg">height</em>{<em class="arg">+-</em>}<em class="arg">offset</em>{<em class="arg">%</em>}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3596	</div>
				3597
				3598	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>perform local adaptive threshold.</td><td style='text-align:right;'></td></tr></table>
				3599
				3600	<p>Adaptively threshold each pixel based on the value of pixels in a
				3601	surrounding window. If the current pixel is lighter than this average plus
				3602	the optional <kbd>offset</kbd>, then it is made white, otherwise it is made
				3603	black. Small variations in pixel values such as found in scanned documents
				3604	can be ignored if offset is positive. A negative offset will make it more
				3605	sensitive to those small variations. </p>
				3606
				3607	<p>This is commonly used to threshold images with an uneven background. It is
				3608	based on the assumption that average color of the small window is the
				3609	the local background color, from which to separate the forground color. </p>
				3610
				3611
				3612	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3613	<h4><a id="layers"></a>-layers <em class="arg">method</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3614	</div>
				3615
				3616	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>handle multiple images forming a set of image layers or animation frames.</td><td style='text-align:right;'></td></tr></table>
				3617
				3618	<p>Perform various image operation methods to a ordered sequence of images
				3619	which may represent either a set of overlaid 'image layers', a GIF disposal
				3620	animation, or a fully-'coalesced' animation sequence. </p>
				3621
				3622	<table class="doc">
				3623	<tbody>
				3624	<tr valign="top">
				3625	<th align="left" style="width: 8%">Method</th>
				3626	<th align="left">Description</th>
				3627	</tr>
				3628
				3629	<tr valign="top">
				3630	<td valign="top">compare-any</td>
				3631	<td valign="top">Crop the second and later frames to the smallest rectangle
				3632	that contains all the differences between the two images. No GIF <a
				3633	href="#dispose" >-dispose</a> methods are taken into account. </td>
				3634	</tr>
				3635
				3636	<tr><td></td><td>This exactly the same as the <a href="#deconstruct"
				3637	>-deconstruct</a> operator, and does not preserve animations normal
				3638	working, especially when animation used layer disposal methods such as
				3639	'<kbd>Previous</kbd>' or '<kbd>Background</kbd>'. </td>
				3640	</tr>
				3641
				3642	<tr valign="top">
				3643	<td valign="top">compare-clear</td>
				3644	<td valign="top">As '<kbd>compare-any</kbd>' but crop to the bounds of any
				3645	opaque pixels which become transparent in the second frame. That is the
				3646	smallest image needed to mask or erase pixels for the next frame. </td>
				3647	</tr>
				3648
				3649	<tr valign="top">
				3650	<td valign="top">compare-overlay</td>
				3651	<td valign="top">As '<kbd>compare-any</kbd>' but crop to pixels that add
				3652	extra color to the next image, as a result of overlaying color pixels.
				3653	That is the smallest single overlaid image to add or change colors. </td>
				3654	</tr>
				3655
				3656	<tr><td></td><td>This can be used with the <a href="#compose" >-compose</a> alpha
				3657	composition method '<kbd>change-mask</kbd>', to reduce the image to
				3658	just the pixels that need to be overlaid. </td>
				3659	</tr>
				3660
				3661	<tr valign="top">
				3662	<td valign="top">coalesce</td>
				3663	<td valign="top">Equivalent to a call to the <a href="#coalesce"
				3664	>-coalesce</a> operator. Apply the layer disposal methods set in the
				3665	current image sequence to form a fully defined animation sequence, as
				3666	it should be displayed. Effectively converting a GIF animation into a
				3667	'film strip'-like animation. </td>
				3668	</tr>
				3669
				3670	<tr valign="top">
				3671	<td valign="top">composite</td>
				3672	<td valign="top">Alpha Composition of two image lists, separated by a
				3673	"<kbd>null:</kbd>" image, with the destination image list first, and
				3674	the source images last. An image from each list are composited
				3675	together until one list is finished. The separator image and source
				3676	image lists are removed. </td>
				3677	</tr>
				3678
				3679
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	3680	<tr><td></td>
				3681	<td>The <a href="#geometry" >-geometry</a> offset is adjusted according
				3682	to <a href="#gravity" >-gravity</a> in accordance of the virtual
				3683	canvas size of the first image in each list. Unlike a normal <a
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3684	href="#composite" >-composite</a> operation, the canvas offset is also
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	3685	added to the final composite positioning of each image. </td> </tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3686
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	3687	<tr><td></td>
				3688	<td>If one of the image lists only contains one image, that image is
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3689	applied to all the images in the other image list, regardless of which
				3690	list it is. In this case it is the image meta-data of the list which
				3691	preserved. </td>
				3692	</tr>
				3693
				3694
				3695	<tr valign="top">
				3696	<td valign="top">dispose</td>
				3697	<td valign="top">This like '<kbd>coalesce</kbd>' but shows the look of
				3698	the animation after the layer disposal method has been applied, before
				3699	the next sub-frame image is overlaid. That is the 'dispose' image that
				3700	results from the application of the GIF <a href="#dispose"
				3701	>-dispose</a> method. This allows you to check what
				3702	is going wrong with a particular animation you may be developing.
				3703	</td>
				3704	</tr>
				3705
				3706	<tr valign="top">
				3707	<td valign="top">flatten</td>
				3708	<td valign="top">Create a canvas the size of the first images virtual
				3709	canvas using the current <a href="#background" >-background</a> color,
				3710	and <a href="#compose" >-compose</a> each image in turn onto that
				3711	canvas. Images falling outside that canvas is clipped. Final
				3712	image will have a zero virtual canvas offset. </td>
				3713	</tr>
				3714
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	3715	<tr><td></td>
				3716	<td>This usally used as one of the final 'image layering' operations
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3717	overlaying all the prepared image layers into a final image. </td>
				3718	</tr>
				3719
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	3720	<tr><td></td>
				3721	<td>For a single image this method can also be used to fillout a virtual
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3722	canvas with real pixels, or to underlay a opaque color to remove
				3723	transparency from an image.</td>
				3724	</tr>
				3725
				3726
				3727	<tr valign="top">
				3728	<td valign="top">merge</td>
				3729	<td valign="top">As 'flatten' method but merging all the given image
				3730	layers into a new layer image just large enough to hold all the image
				3731	without clipping or extra space. The new images virtual offset will
				3732	prevere the position of the new layer, even if this offset is
				3733	negative. the virtual canvas size of the first image is preserved.
				3734	</td>
				3735	</tr>
				3736
				3737	<tr><td></td><td>Caution is advised when handling image layers with negative offsets
				3738	as few image file formats handle them correctly. </td>
				3739	</tr>
				3740
				3741	<tr valign="top">
				3742	<td valign="top">mosaic</td>
				3743	<td valign="top">As 'flatten' method but expanding the initial canvas size
				3744	of the first image so as to hold all the image layers. However as a
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3745	virtual canvas is 'locked' to the origin, by definition, image layers
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3746	with a negative offsets will still be clipped by the top and left
				3747	edges.</td>
				3748	</tr>
				3749
				3750	<tr><td></td><td>This method is commonly used to layout individual image using various
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3751	offset but without knowing the final canvas size. The resulting image
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3752	will, like 'flatten' not have any virtual offset, so can be saved to
				3753	any image file format. </td>
				3754	</tr>
				3755
				3756
				3757	<tr valign="top">
				3758	<td valign="top">optimize</td>
				3759	<td valign="top">Optimize a coalesced animation, into GIF animation using
				3760	a number of general techniques. This currently a short cut to
				3761	apply both the '<kbd>optimize-frame</kbd>', and
				3762	'<kbd>optimize-transparency</kbd>' methods but may be expanded to
				3763	include other optimization methods as they are developed. </td>
				3764	</tr>
				3765
				3766	<tr valign="top">
				3767	<td valign="top">optimize-frame</td>
				3768	<td valign="top">Optimize a coalesced animation, into GIF animation by
				3769	reducing the number of pixels per frame as much as possible by
				3770	attempting to pick the best layer disposal method to use, while ensuring
				3771	the result will continue to animate properly. </td>
				3772	</tr>
				3773
				3774	<tr><td></td><td> There is no guarantee that the best optimization is found. But
				3775	then no reasonably fast GIF optimization algorithm can do this.
				3776	However this does seem to do better than most other GIF frame
				3777	optimizers seen. </td>
				3778	</tr>
				3779
				3780	<tr valign="top">
				3781	<td valign="top">optimize-plus</td>
				3782	<td valign="top">As '<kbd>optimize-frame</kbd>' but attempt to improve the
				3783	overall optimization by adding extra frames to the animation, without
				3784	changing the final look or timing of the animation. The frames are
				3785	added to attempt to separate the clearing of pixels from the
				3786	overlaying of new additional pixels from one animation frame to the
				3787	next. If this does not improve the optimization (for the next frame
				3788	only), it will fall back to the results of the previous normal
				3789	'<kbd>optimize-frame</kbd>' technique. </td>
				3790	</tr>
				3791
				3792	<tr><td></td><td>There is the possibility that the change in the disposal style will
				3793	result in a worsening in the optimization of later frames, though this
				3794	is unlikely. In other words there no guarantee that it is better than
				3795	the normal '<kbd>optimize-frame</kbd>' technique. For some animations
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3796	however you can get a vast improvement in the final animation size. </td>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3797	</tr>
				3798
				3799	<tr valign="top">
				3800	<td valign="top">optimize-transparency</td>
				3801	<td valign="top">Given a GIF animation, replace any pixel in the sub-frame
				3802	overlay images with transparency, if it does not change the resulting
				3803	animation by more than the current <a href="#fuzz" >-fuzz</a> factor.
				3804	</td>
				3805	</tr>
				3806
				3807	<tr><td></td><td>This should allow a existing frame optimized GIF animation to compress
				3808	into a smaller file size due to larger areas of one (transparent)
				3809	color rather than a pattern of multiple colors repeating the current
				3810	disposed image of the last frame. </td>
				3811	</tr>
				3812
				3813	<tr valign="top">
				3814	<td valign="top">remove-dups</td>
				3815	<td valign="top">Remove (and merge time delays) of duplicate consecutive
				3816	images, so as to simplify layer overlays of coalesced animations.
				3817	</td>
				3818	</tr>
				3819
				3820	<tr><td></td><td>Usually this a result of using a constant time delay across the
				3821	whole animation, or after a larger animation was split into smaller
				3822	sub-animations. The duplicate frames could also have been used as
				3823	part of some frame optimization methods. </td>
				3824	</tr>
				3825
				3826	<tr valign="top">
				3827	<td valign="top">remove-zero</td>
				3828	<td valign="top">Remove any image with a zero time delay, unless ALL the
				3829	images have a zero time delay (and is not a proper timed animation, a
				3830	warning is then issued). </td>
				3831	</tr>
				3832
				3833	<tr><td></td><td>In a GIF animation, such images are usually frames which provide
				3834	partial intermediary updates between the frames that are actually
				3835	displayed to users. These frames are usally added for improved frame
				3836	optimization in GIF animations. </td>
				3837	</tr>
				3838
				3839	<tr valign="top">
				3840	<td valign="top">trim-bounds</td>
				3841	<td valign="top">Find the bounds of all the images in the current
				3842	image sequence, then adjust the offsets so all images are contained on
				3843	a minimal positive canvas. None of the image data is modified, only
				3844	there virtual canvas size and offset. The all the image is given
				3845	the same canvas size, and and will have a positive offset, but will
				3846	remain in the same position relative to each other. As a result of the
				3847	minimal canvas size at least one image will touch every edge of that
				3848	canvas. The image data however may be transparent.
				3849	</td>
				3850	</tr>
				3851
				3852	</tbody>
				3853	</table>
				3854
				3855	<p>To print a complete list of layer types, use <a href="#list">-list layers</a>.</p>
				3856
				3857	<p>The operators <a href="#coalesce" >-coalesce</a>, <a href="#deconstruct"
				3858	>-deconstruct</a>, <a href="#flatten" >-flatten</a>, and <a href="#mosaic"
				3859	>-mosaic</a> are only aliases for the above methods. Also see <a
				3860	href="#page" >-page</a>, <a href="#repage" >-repage</a> operators, the <a
				3861	href="#compose" >-compose</a> setting, and the GIF <a href="#dispose"
				3862	>-dispose</a> and <a href="#delay" >-delay</a> settings. </p>
				3863
				3864
				3865	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3866	<h4><a id="level"></a>-level <em class="arg">black_point</em>{,<em class="arg">white_point</em>}{<em class="arg">%</em>}{,<em class="arg">gamma</em>}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3867	</div>
				3868
				3869	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>adjust the level of image channels.</td><td style='text-align:right;'></td></tr></table>
				3870
				3871	<p>Given one, two or three values delimited with commas: black-point,
				3872	white-point, gamma (for example: 10,250,1.0 or 2%,98%,0.5). The black and
				3873	white points range from 0 to <em class="QR">QuantumRange</em>, or from 0 to 100%; if the white
				3874	point is omitted it is set to (<em class="QR">QuantumRange</em> - black_point), so as to center
				3875	contrast changes. If a <kbd>%</kbd> sign is present anywhere in the string,
				3876	both black and white points are percentages of the full color range. Gamma
				3877	will do a <a href="#gamma">-gamma</a> adjustment of the values. If it is
				3878	omitted, the default of 1.0 (no gamma correction) is assumed.</p>
				3879
				3880	<p>In normal usage (<kbd>-level</kbd>) the image values are stretched so that
				3881	the given '<kbd>black_point</kbd>' value in the original image is set to
				3882	zero (or black), while the given '<kbd>white_point</kbd>' value is set to
				3883	<em class="QR">QuantumRange</em> (or white). This provides you with direct contrast adjustments
				3884	to the image. The '<kbd>gamma</kbd>' of the resulting image will then be
				3885	adjusted. </p>
				3886
				3887	<p>From ImageMagick v6.4.1-9 using the plus form of the operator (<kbd>+level</kbd>) or
				3888	adding the special '!' flag anywhere in the argument list, will cause the
				3889	operator to do the reverse of the level adjustment. That is a zero, or
				3890	<em class="QR">QuantumRange</em> value (black, and white, resp.) in the original image, is
				3891	adjusted to the given level values, allowing you to de-contrast, or compress
				3892	the channel values within the image. The '<kbd>gamma</kbd>' is adjusted before the level adjustment to de-contrast the image is made. </p>
				3893
				3894	<p>Only the channels defined by the current <a href="#channel">-channel</a>
				3895	setting are adjusted (defaults to RGB color channels only), allowing you to
				3896	limit the effect of this operator. </p>
				3897
				3898	<p>Please note that the transparency channel is treated as 'matte'
				3899	values (0 is opaque) and not as 'alpha' values (0 is transparent).</p>
				3900
				3901
				3902	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3903	<h4><a id="level-colors"></a>-level-colors {<em
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3904	class="arg">black_color</em>}{,}{<em class="arg">white_color</em>}</h4>
				3905	</div>
				3906
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3907	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>adjust the level of an image using the provided dash separated colors.</td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3908
				3909	<p>This function is exactly like <a href="#level">-level</a>, except that the
				3910	value value for each color channel is determined by the
				3911	'<kbd>black_color</kbd>' and '<kbd>white_color</kbd>' colors given (as
				3912	described under the <a href="#fill">-fill</a> option). </p>
				3913
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3914	<p>This effectually means the colors provided to <kbd>-level-colors</kbd>
				3915	is mapped to become 'black' and 'white' respectively, with all the other
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3916	colors linearly adjusted (or clipped) to match that change. Each channel is
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3917	adjusted separately using the channel values of the colors specified. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3918
				3919	<p>On the other hand the plus form of the operator (<kbd>+level-colors</kbd>)
				3920	will map the image color 'black' and 'white' to the given colors
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3921	respectively, resulting in a gradient (de-contrasting) tint of the image to
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3922	those colors. This can also be used to convert a plain gray-scale image into a
				3923	one using the gradient of colors specified. </p>
				3924
				3925	<p>By supplying a single color with a comma separator either before or after
				3926	that color, will just replace the respective 'black' or 'white' point
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3927	respectively. But if no comma separator is provided, the given color is
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3928	used for both the black and white color points, making the operator either
				3929	threshold the images around that color (- form) or set all colors to that
				3930	color (+ form). </p>
				3931
				3932
				3933	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3934	<h4><a id="limit"></a>-limit <em class="arg">type value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3935	</div>
				3936
				3937	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the pixel cache resource limit.</td><td style='text-align:right;'></td></tr></table>
				3938
				3939	<p>Choose from: <kbd>area</kbd>, <kbd>disk</kbd>, <kbd>file</kbd>, <kbd>map</kbd>, <kbd>memory</kbd>, <kbd>threads</kbd>, or <kbd>time</kbd>.</p>
				3940
cristy	6b63665	2009-12-05 17:16:11 +0000	[diff] [blame]	3941	<p>The value for <kbd>file</kbd> is in number of files. The other limits are in bytes. By default the limits are 768 files, 2GB of image area, 1.5GiB memory, 8GiB memory map, and 18.45EB of disk. These limits are adjusted relative to the available resources on your computer if this information is available. When any limit is reached, ImageMagick fails in some fashion but attempts to take compensating actions, if possible. For example, the following limits memory:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3942
				3943	<p class="crtsnip">
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	3944	-limit memory 32MiB -limit map 64MiB
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3945	</p>
				3946
				3947	<p>Use <a href="#list">-list resource</a> to list the current limits. For example, our system shows these limits:</p>
				3948
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3949	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>identify -list resource</span><span class='crtout'></span></p><pre class="text">
				3950	File Area Memory Map Disk Thread Time
cristy	6b63665	2009-12-05 17:16:11 +0000	[diff] [blame]	3951	------------------------------------------------------------------------------
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3952	768 12.404GB 8.6642GiB 23.104GiB 18.446744EB 8 unlimited
				3953	</pre>
				3954
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3955	<p>Requests for pixel storage to keep intermediate images are satisfied by one of three resource categories: in-memory pool, memory-mapped files pool, and disk pool (in that order) depending on the <a href="../www/command-line-options.html#limit">‑limit</a> settings and whether the system honors a resource request. If the total size of allocated pixel storage in the given pool reaches the corresponding limit, the request is passed to the next pool. Additionally, requests that exceed the <kbd>area</kbd> limit automagically are allocated on disk.</p>
				3956
				3957	<p>To illustrate how ImageMagick utilizes resource limits, consider a typical image resource request. First, ImageMagick tries to allocate the pixels in memory. The request might be denied if the resource request exceeds the <kbd>memory</kbd> limit or if the system does not honor the request. If a memory request is not honored, the pixels are allocated to disk and the file is memory-mapped. However, if the allocation request exceeds the <kbd>map</kbd> limit, the resource allocation goes to disk. In all cases, if the resource request exceeds the <kbd>area</kbd> limit, the pixels are automagically cached to disk. If the disk has a hard limit, the program fails.</p>
				3958
				3959	<p>In most cases you simply do not need to concern yourself with resource limits. ImageMagick chooses reasonable defaults and most images do not tax your computer resources. Where limits do come in handy is when you process images that are large or on shared systems where ImageMagick can consume all or most of the available memory. In this case, the ImageMagick workflow slows other processes or, in extreme cases, brings the system to a halt. Under these circumstances, setting limits give some assurances that the ImageMagick workflow will not interfere with other concurrent uses of the computer. For example, assume you have a web interface that processes images uploaded from the Internet. To assure ImageMagick does not exceed 10mb of memory you can simply set the area limit to 10mb:</p>
				3960
				3961	<p class="crtsnip">
				3962	-limit area 10mb
				3963	</p>
				3964
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3965	<p>Now whenever a large image is processed, the pixels are automagically cached to disk instead of memory. This of course implies that large images typically process very slowly, simply because pixel processing in memory can be an order of magnitude faster than on disk. Because your web site users might inadvertently upload a huge image to process, you should set a disk limit as well:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3966
				3967	<p class="crtsnip">
				3968	-limit area 10mb -limit disk 500mb
				3969	</p>
				3970
				3971	<p>Here ImageMagick stops processing if an image requires more than 500MB of disk storage.</p>
				3972
				3973	<p>In addition to command-line resource limit option, resources can be set with <a href="../www/resources.html#environment">environment variables</a>. Set the environment variables <kbd>MAGICK_AREA_LIMIT</kbd>, <kbd>MAGICK_DISK_LIMIT</kbd>, <kbd>MAGICK_FILE_LIMIT</kbd>, <kbd>MAGICK_MEMORY_LIMIT</kbd>, <kbd>MAGICK_MAP_LIMIT</kbd>, <kbd>MAGICK_THREAD_LIMIT</kbd>, <kbd>MAGICK_TIME_LIMIT</kbd> for limits of image area, disk space, open files, heap memory, memory map, number of threads of execution, and maximum elapsed time in seconds respectively.</p>
				3974
				3975	<p> Inquisitive users can try adding <a href="#debug">-debug cache</a> to their commands and then scouring the generated output for references to the pixel cache, in order to determine how the pixel cache was allocated and how resources were consumed. Advanced Unix/Linux users can pipe that output through <kbd>grep memory\|open\|destroy\|disk</kbd> for more readable sifting.
				3976	</p>
				3977
				3978	<p>For more about ImageMagick's use of resources, see the section <b>Cache Storage and Resource Requirements</b> on the <a href="../www/architecture.html#cache">Architecture</a> page.
				3979	</p>
				3980
				3981	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3982	<h4><a id="linear-stretch"></a>-linear-stretch <em class="arg">black-point</em><br />-linear-stretch <em class="arg">black-point</em>{x<em class="arg">white-point</em>}{<em class="arg">%</em>}}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3983	</div>
				3984
				3985	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Linear with saturation stretch.</td><td style='text-align:right;'></td></tr></table>
				3986
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	3987	<p>This is very similar to <a href="#contrast-stretch" >-contrast-stretch</a>,
				3988	and uses a 'histogram bin' to determine the range of color values that needs to
				3989	be stretched. However it then stretchs those colors using the <a
				3990	href="#level" >-level</a> operator.</p>
				3991
				3992	<p>As such while the initial determination may have 'binning' round off
				3993	effects, the image colors are stretched mathematically, rather than using the
				3994	histogram bins. This makes the operator more accurate. </p>
				3995
				3996	<p>note however that a <a href="#linear-stretch" >-linear-stretch</a> of
				3997	'<kbd>0</kbd>' does nothing, while a value of '<kbd>1</kbd>' does a near
				3998	perfect stretch of the color range. </p>
				3999
				4000	<p>See also <a href="#auto-level" >-auto-level</a> for a 'perfect'
				4001	normalization of mathematical images. </p>
				4002
				4003	<p>This operator is under review for re-development. </p>
				4004
				4005
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4006	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4007	<h4><a id="linewidth"></a>-linewidth</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4008	</div>
				4009
				4010	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>the line width for subsequent draw operations.</td><td style='text-align:right;'></td></tr></table>
				4011
				4012	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4013	<h4><a id="liquid-rescale"></a>-liquid-rescale <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4014	</div>
				4015
				4016	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>rescale image with seam-carving.</td><td style='text-align:right;'></td></tr></table>
				4017
				4018	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				4019
				4020	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4021	<h4><a id="list"></a>-list <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4022	</div>
				4023
				4024	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Print a list of supported arguments for various options or settings. Choose from these list types:</td><td style='text-align:right;'></td></tr></table>
				4025
				4026	<pre class="text">
cristy	c1aee83	2010-05-08 00:36:47 +0000	[diff] [blame]	4027	Align
				4028	Alpha
				4029	Boolean
				4030	Channel
				4031	Class
				4032	ClipPath
				4033	Coder
				4034	Color
				4035	Colorspace
				4036	Command
				4037	Compose
				4038	Compress
				4039	Configure
				4040	DataType
				4041	Debug
				4042	Decoration
				4043	Delegate
				4044	Direction
				4045	Dispose
				4046	Distort
				4047	Dither
				4048	Endian
				4049	Evaluate
				4050	FillRule
				4051	Filter
				4052	Font
				4053	Format
				4054	Function
				4055	Gravity
				4056	ImageList
				4057	Intent
				4058	Interlace
				4059	Interpolate
				4060	Kernel
cristy	787d435	2010-03-06 13:55:58 +0000	[diff] [blame]	4061	Layers
				4062	LineCap
				4063	LineJoin
				4064	List
				4065	Locale
				4066	LogEvent
				4067	Log
				4068	Magic
				4069	Method
				4070	Metric
				4071	Mime
				4072	Mode
				4073	Morphology
				4074	Module
				4075	Noise
				4076	Orientation
				4077	Policy
				4078	PolicyDomain
				4079	PolicyRights
				4080	Preview
				4081	Primitive
				4082	QuantumFormat
				4083	Resource
				4084	SparseColor
				4085	Storage
				4086	Stretch
				4087	Style
				4088	Threshold
				4089	Type
				4090	Units
				4091	Validate
				4092	VirtualPixel
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4093	</pre>
				4094
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4095	<p>These lists vary depending on your version of ImageMagick. Use "<kbd>-list
				4096	list</kbd>" to get a complete listing of all the "<kbd>-list</kbd>" arguments
				4097	available:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4098
				4099	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>identify -list list</span></p>
				4100	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4101	<h4><a id="log"></a>-log <em class="arg">string</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4102	</div>
				4103
				4104	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Specify format for debug log.</td><td style='text-align:right;'></td></tr></table>
				4105
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4106	<p>This option specifies the format for the log printed when the <a
				4107	href="#debug">-debug</a> option is active.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4108
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4109	<p>You can display the following components by embedding special format
				4110	characters:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4111
				4112	<pre class="text">
				4113	%d domain
				4114	%e event
				4115	%f function
				4116	%l line
				4117	%m module
				4118	%p process ID
				4119	%r real CPU time
				4120	%t wall clock time
				4121	%u user CPU time
				4122	%% percent sign
				4123	\n newline
				4124	\r carriage return
				4125	</pre>
				4126
				4127	<p>For example:</p>
				4128
				4129	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert -debug coders -log "%u %m:%l %e" in.gif out.png</span></p>
				4130	<p>The default behavior is to print all of the components.</p>
				4131
				4132	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4133	<h4><a id="loop"></a>-loop <em class="arg">iterations</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4134	</div>
				4135
				4136	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>add Netscape loop extension to your GIF animation.</td><td style='text-align:right;'></td></tr></table>
				4137
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4138	<p>Set iterations to zero to repeat the animation an infinite number of times,
				4139	otherwise the animation repeats itself up to <em class="arg">iterations</em>
				4140	times.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4141
				4142	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4143	<h4><a id="lowlight-color"></a>-lowlight-color <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4144	</div>
				4145
				4146	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>when comparing images, de-emphasize pixel differences with this color.</td><td style='text-align:right;'></td></tr></table>
				4147
				4148	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4149	<h4><a id="magnify"></a>-magnify <em class="arg">factor</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4150	</div>
				4151
				4152	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>magnify the image.</td><td style='text-align:right;'></td></tr></table>
				4153
				4154
				4155	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4156	<h4><a id="map"></a>-map <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4157	</div>
				4158
				4159	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Display image using this <em class="arg">type</em>.</td><td style='text-align:right;'>[<a href="../www/animate.html">animate</a>, <a href="../www/display.html">display</a>]</td></tr></table>
				4160
				4161	<p>Choose from these <em class="arg">Standard Colormap</em> types:</p>
				4162
				4163	<pre class="text">
				4164	best
				4165	default
				4166	gray
				4167	red
				4168	green
				4169	blue
				4170	</pre>
				4171
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4172	<p>The <em class="arg">X server</em> must support the <em class="arg">Standard
				4173	Colormap</em> you choose, otherwise an error occurs. Use <kbd>list</kbd> as
				4174	the type and <kbd>display</kbd> searches the list of colormap types in
				4175	<kbd>top-to-bottom</kbd> order until one is located. See <em
				4176	class="arg">xstdcmap(1)</em> for one way of creating Standard Colormaps.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4177
				4178
				4179	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4180	<h4><a id="map_stream_"></a>-map <em class="arg">components</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4181	</div>
				4182
				4183	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>pixel map.</td><td style='text-align:right;'>[<a href="../www/stream.html">stream</a>]</td></tr></table>
				4184
				4185	<p>Here are the valid components of a map:</p>
				4186
				4187	<pre class="text">
				4188	r red pixel component
				4189	g green pixel component
				4190	b blue pixel component
				4191	a alpha pixel component (0 is transparent)
				4192	o opacity pixel component (0 is opaque)
				4193	i grayscale intensity pixel component
				4194	c cyan pixel component
				4195	m magenta pixel component
				4196	y yellow pixel component
				4197	k black pixel component
				4198	p pad component (always 0)
				4199	</pre>
				4200
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4201	<p>You can specify as many of these components as needed in any order (e.g.
				4202	bgr). The components can repeat as well (e.g. rgbr).</p>
				4203
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4204
				4205	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4206	<h4><a id="mask"></a>-mask
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4207	<em class="arg">filename</em></h4>
				4208	</div>
				4209
				4210	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Composite the image pixels as defined by the mask.</td><td style='text-align:right;'></td></tr></table>
				4211
				4212	<p>Use <a href="#mask">+mask</a> to remove the image mask.</p>
				4213
				4214	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4215	<h4><a id="mattecolor"></a>-mattecolor <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4216	</div>
				4217
				4218	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Specify the color to be used with the <a href="#frame">-frame</a> option.</td><td style='text-align:right;'></td></tr></table>
				4219
				4220	<p>The color is specified using the format described under the <a href="#fill">-fill</a> option.</p>
				4221
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4222	<p>The default matte color is <kbd>#BDBDBD</kbd>, <span
				4223	style="background-color: #bdbdbd;">this shade of gray</span>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4224
				4225	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4226	<h4><a id="maximum"></a>-maximum</h4>
cristy	d2baf7d	2010-03-06 04:26:44 +0000	[diff] [blame]	4227	</div>
				4228
				4229	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>return the maximum intensity of an image sequence.</td><td style='text-align:right;'></td></tr></table>
				4230
				4231	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4232	<h4><a id="median"></a>-median <em class="arg">radius</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4233	</div>
				4234
				4235	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>apply a median filter to the image.</td><td style='text-align:right;'></td></tr></table>
				4236
				4237	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4238	<h4><a id="metric"></a>-metric <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4239	</div>
				4240
				4241	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Output to STDERR a measure of the differences between images according to the <em class="arg">type</em> given metric.</td><td style='text-align:right;'></td></tr></table>
				4242
				4243	<p>Choose from:</p>
				4244
				4245	<pre class="text">
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4246	AE absolute error count, number of different pixels (-fuzz effected)
cristy	a20e3f9	2010-12-13 01:52:32 +0000	[diff] [blame]	4247	FUZZ mean color distance
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4248	MAE mean absolute error (normalized), average channel error distance
				4249	MEPP mean error per pixel (normalized mean error, normalized peak error)
				4250	MSE mean error squared, average of the channel error squared
cristy	a20e3f9	2010-12-13 01:52:32 +0000	[diff] [blame]	4251	NCC normalized cross correlation
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4252	PAE peak absolute (normalize peak absolute)
				4253	PSNR peak signal to noise ratio
				4254	RMSE root mean squared (normalized root mean squared)
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4255	</pre>
				4256
cristy	771f7a7	2010-11-27 21:42:59 +0000	[diff] [blame]	4257	<p>Control the '<kbd>AE</kbd>', or absolute count of pixels that are different,
				4258	with the <a href="#fuzz" >-fuzz</a> factor (ignore pixels which
				4259	only changed by a small amount). Use '<kbd>PAE</kbd>' to find the
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4260	size of the <a href="#fuzz" >-fuzz</a> factor needed to make all pixels
cristy	771f7a7	2010-11-27 21:42:59 +0000	[diff] [blame]	4261	'similar', while '<kbd>MAE</kbd>' dtermines the factor needed
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4262	for about half the pixels to be similar. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4263
				4264	<p>The '<kbd>MEPP</kbd>' metric returns three different metrics
				4265	('<kbd>MAE</kbd>', '<kbd>MAE</kbd>' normalized, and '<kbd>PAE</kbd>'
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	4266	normalized) from a single comparison run. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4267
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4268	<p>To print a complete list of metrics, use the <a href="#list">-list
				4269	metrics</a> option.</p>
				4270
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4271
cristy	d2baf7d	2010-03-06 04:26:44 +0000	[diff] [blame]	4272	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4273	<h4><a id="minimum"></a>-minimum</h4>
cristy	d2baf7d	2010-03-06 04:26:44 +0000	[diff] [blame]	4274	</div>
				4275
				4276	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>return the minimum intensity of an image sequence.</td><td style='text-align:right;'></td></tr></table>
				4277
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4278
				4279	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4280	<h4><a id="mode"></a>-mode <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4281	</div>
				4282
				4283	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Mode of operation.</td><td style='text-align:right;'>[<a href="../www/montage.html">montage</a>]</td></tr></table>
				4284
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4285	<p>Choose the <em class="arg">value</em> from these styles: <kbd>Frame,
				4286	Unframe, or Concatenate</kbd></p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4287
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4288	<p>Use the <a href="#list" >-list</a> option with a '<kbd>Mode</kbd>' argument
				4289	for a list of <a href="#mode" >-mode</a> arguments available in your
				4290	ImageMagick installation.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4291
				4292
				4293	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4294	<h4><a id="modulate"></a>-modulate <em class="arg">brightness</em>[,<em class="arg">saturation</em>,<em class="arg">hue</em>]</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4295	</div>
				4296
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4297	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Vary the <em class="arg">brightness</em>, <em
				4298	class="arg">saturation</em>, and <em class="arg">hue</em> of an image.</td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4299
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4300	<p>The arguments are given as a percentages of variation. A value of 100 means
				4301	no change, and any missing values are taken to mean 100.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4302
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4303	<p>The <em class="arg">brightness</em> is a multiplier of the overall
				4304	brightness of the image, so 0 means pure black, 50 is half as bright, 200 is
				4305	twice as bright. To invert its meaning <a href="#negate">-negate</a> the image
				4306	before and after. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4307
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4308	<p>The <em class="arg">saturation</em> controls the amount of color in an
				4309	image. For example, 0 produce a grayscale image, while a large value such as
				4310	200 produce a very colorful, 'cartoonish' color.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4311
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4312	<p>The <em class="arg">hue</em> argument causes a "rotation" of the colors
				4313	within the image by the amount specified. For example, 50 results in
				4314	a counter-clockwise rotation of 90, mapping red shades to purple, and so on.
				4315	A value of either 0 or 200 results in a complete 180 degree rotation of the
				4316	image. Using a value of 300 is a 360 degree rotation resulting in no change to
				4317	the original image. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4318
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4319	<p>For example, to increase the color brightness by 20% and decrease the color
				4320	saturation by 10% and leave the hue unchanged, use <a
				4321	href="#modulate">-modulate 120,90</a>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4322
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4323	<p>Use <a href="#set">-set</a> attribute of '<kbd
				4324	class="arg">option:modulate:colorspace</kbd>' to specify which colorspace to
				4325	modulate. Choose from <kbd>HSB</kbd>, <kbd>HSL</kbd> (the default), or
				4326	<kbd>HWB</kbd>. For example,</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4327
				4328	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert image.png -set option:modulate:colorspace hsb -modulate 120,90 modulate.png</span></p>
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4329
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4330	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4331	<h4><a id="monitor"></a>-monitor</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4332	</div>
				4333
				4334	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>monitor progress.</td><td style='text-align:right;'></td></tr></table>
				4335
				4336
				4337	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4338	<h4><a id="monochrome"></a>-monochrome</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4339	</div>
				4340
				4341	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>transform the image to black and white.</td><td style='text-align:right;'></td></tr></table>
				4342
				4343
				4344	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4345	<h4><a id="morph"></a>-morph <em class="arg">frames</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4346	</div>
				4347
				4348	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>morphs an image sequence.</td><td style='text-align:right;'></td></tr></table>
				4349
				4350	<p>Both the image pixels and size are linearly interpolated to give the
				4351	appearance of a meta-morphosis from one image to the next, over all the images
				4352	in the current image list. The added images are the equivalent of a <a
				4353	href="#blend">-blend</a> composition. The <em class="arg">frames</em>
				4354	argument determine how many images to interpolate between each image. </p>
				4355
				4356
				4357	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4358	<h4><a id="morphology"></a>-morphology</h4>
				4359	<h4>-morphology <em class="arg">method</em> <em class="arg">kernel</em></h4>
cristy	488844c	2010-01-22 14:02:05 +0000	[diff] [blame]	4360	</div>
				4361
cristy	2c83960	2010-04-03 02:32:08 +0000	[diff] [blame]	4362	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>apply a morphology method to the image.</td><td style='text-align:right;'></td></tr></table>
cristy	488844c	2010-01-22 14:02:05 +0000	[diff] [blame]	4363
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4364	<p>Until I get around to writing a option summary for this, see <a
				4365	href="http://www.imagemagick.org/Usage/morphology/" >IM Usage Examples,
				4366	Morphology</a>. </p>
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	4367
				4368
cristy	488844c	2010-01-22 14:02:05 +0000	[diff] [blame]	4369	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4370	<h4><a id="mosaic"></a>-mosaic</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4371	</div>
				4372
				4373	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>an simple alias for the <a href="#layers" >-layers</a> method "mosaic"</td><td style='text-align:right;'></td></tr></table>
				4374
				4375
				4376	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4377	<h4><a id="motion-blur"></a>-motion-blur <em class="arg">radius</em><br />-motion-blur <em class="arg">radius</em>x<em class="arg">sigma</em>+<em class="arg">angle</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4378	</div>
				4379
				4380	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>simulate motion blur.</td><td style='text-align:right;'></td></tr></table>
				4381
				4382	<p>Blur with the given radius, standard deviation (sigma), and angle. The
				4383	angle given is the angle toward which the image is blurred. That is the
				4384	direction people would consider the object is coming from. </p>
				4385
				4386	<p>Note that the blur is not uniform distribution, giving the motion a
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	4387	definite sense of direction of movement. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4388
				4389	<p>The <a href="#virtual-pixel">-virtual-pixel</a> setting will determine how
				4390	pixels which are outside the image proper are blurred into the final result.
				4391	</p>
				4392
				4393	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4394	<h4><a id="name"></a>-name</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4395	</div>
				4396
				4397	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>name an image.</td><td style='text-align:right;'></td></tr></table>
				4398	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4399	<h4><a id="negate"></a>-negate</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4400	</div>
				4401
cristy	b29bc03	2010-02-01 20:29:43 +0000	[diff] [blame]	4402	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>replace each pixel with its complementary color.</td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4403
				4404	<p>The red, green, and blue intensities of an image are negated. White becomes black, yellow becomes blue, etc. Use <a href="#negate">+negate</a> to only negate the grayscale pixels of the image.</p>
				4405
				4406	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4407	<h4><a id="noise"></a>-noise <em class="arg">radius</em><br/>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4408	+noise <em class="arg">type</em></h4>
				4409	</div>
				4410
				4411	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Add or reduce noise in an image.</td><td style='text-align:right;'></td></tr></table>
				4412
				4413	<p>The principal function of noise peak elimination filter is to smooth the objects within an image without losing edge information and without creating undesired structures. The central idea of the algorithm is to replace a pixel with its next neighbor in value within a pixel window, if this pixel has been found to be noise. A pixel is defined as noise if and only if this pixel is a maximum or minimum within the pixel window.</p>
				4414
				4415	<p>Use <kbd><a href="#noise">-noise</a> <em class="arg">radius</em></kbd> to specify the width of the neighborhood when reducing noise.</p>
				4416
				4417	<p>Use <a href="#noise">+noise</a> followed by a noise <em class="arg">type</em> to add noise to an image. Choose from these noise types:</p>
				4418
				4419	<pre class="text">
				4420	Gaussian
				4421	Impulse
				4422	Laplacian
				4423	Multiplicative
				4424	Poisson
				4425	Random
				4426	Uniform
				4427	</pre>
				4428
				4429	<p>To print a complete list of noises, use the <a href="#list">-list noise</a> option.</p>
				4430
cristy	8354396	2009-10-16 19:04:28 +0000	[diff] [blame]	4431	<p>Also see the <a href="#evaluate">-evaluate</a> noise functions that allos
				4432	the use of a controlling value to specify teh amount of noise that should be
				4433	added to an image. </p>
				4434
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4435
				4436	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4437	<h4><a id="normalize"></a>-normalize</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4438	</div>
				4439
				4440	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Increase the contrast in an image by <em>stretching</em> the range of intensity values.</td><td style='text-align:right;'></td></tr></table>
				4441
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4442	<p>The intensity values are stretched to cover the entire range of possible
				4443	values. While doing so, black-out at most <em>2%</em> of the pixels and
				4444	white-out at most <em>1%</em> of the pixels.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4445
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4446	<p>Note that as of ImageMagick 6.4.7-0, <a href="#normalize" >-normalize</a>
				4447	is equivalent to <a href="#contrast-stretch" >-contrast-stretch 2%x1%</a>.
				4448	(Before this version, it was equivalent to <a href="#contrast-stretch"
				4449	>-contrast-stretch 2%x99%</a>).</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4450
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4451	<p>All the channels are normalized in concert by the came amount so as to
				4452	preserve color integrity, when the default <a href="#channel" >+channel</a>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	4453	setting is in use. Specifying any other <a href="#channel" >-channel</a>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4454	setting will normalize the RGB channels independently.</p>
				4455
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4456	<p>See <a href="#contrast-stretch" >-contrast-stretch</a> for more details.
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4457	Also see <a href="#auto-level" >-auto-level</a> for a 'perfect' normalization
cristy	8354396	2009-10-16 19:04:28 +0000	[diff] [blame]	4458	that is better suited to mathematically generated images. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4459
				4460	<p>This operator is under review for re-development. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4461
				4462
				4463	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4464	<h4><a id="ordered-dither"></a>-ordered-dither <em class="arg">threshold_map</em>{,<em class="arg">level</em>...}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4465	</div>
				4466
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4467	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>dither the image using a pre-defined ordered dither <em
				4468	class="arg">threshold map</em> specified, and a uniform color map with the
				4469	given number of <em class="arg">levels</em> per color channel . </td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4470
				4471	<p>You can choose from these standard threshold maps:</p>
				4472
				4473	<pre class="text">
cristy	a6d7cf7	2010-11-07 15:58:34 +0000	[diff] [blame]	4474	threshold 1x1 Threshold 1x1 (non-dither)
				4475	checks 2x1 Checkerboard 2x1 (dither)
				4476	o2x2 2x2 Ordered 2x2 (dispersed)
				4477	o3x3 3x3 Ordered 3x3 (dispersed)
				4478	o4x4 4x4 Ordered 4x4 (dispersed)
				4479	o8x8 8x8 Ordered 8x8 (dispersed)
				4480	h4x4a 4x1 Halftone 4x4 (angled)
				4481	h6x6a 6x1 Halftone 6x6 (angled)
				4482	h8x8a 8x1 Halftone 8x8 (angled)
				4483	h4x4o Halftone 4x4 (orthogonal)
				4484	h6x6o Halftone 6x6 (orthogonal)
				4485	h8x8o Halftone 8x8 (orthogonal)
				4486	h16x16o Halftone 16x16 (orthogonal)
				4487	c5x5b c5x5 Circles 5x5 (black)
				4488	c5x5w Circles 5x5 (white)
				4489	c6x6b c6x6 Circles 6x6 (black)
				4490	c6x6w Circles 6x6 (white)
				4491	c7x7b c7x7 Circles 7x7 (black)
				4492	c7x7w Circles 7x7 (white)
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4493	</pre>
				4494
cristy	de36899	2010-11-05 14:32:14 +0000	[diff] [blame]	4495	<p> The <kbd>checks</kbd> pattern produces a 3 level checkerbord dither
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4496	pattern. Or you can define your own <em class="arg" >threshold map</em> in a
cristy	de36899	2010-11-05 14:32:14 +0000	[diff] [blame]	4497	personal or system <kbd>thresholds.xml</kbd> XML file. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4498
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4499	<p>To print a complete list of threshold, use the <a href="#list" >-list
				4500	threshold</a> option.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4501
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4502	<p>It is recommended that the <a href="#map" >+map</a> operator be used after
				4503	applying <a href="#ordered-dither" >-ordered-dither</a> to reduce the number of
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4504	colors an animated image sequence, to less that 256 colors. This ensures that
				4505	a common or global color table is used when saving the result to a color
				4506	limited file format such as GIF. </p>
				4507
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4508	<p>Note that at this time the exact same threshold dithering map is used for
				4509	all color channels, no attempt is made to offset or rotate the map for
				4510	different channels is made, to create an offset printing effect. (possible
				4511	future expansion) </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4512
				4513
				4514	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4515	<h4><a id="opaque"></a>-opaque <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4516	</div>
				4517
				4518	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>change this color to the fill color within the image.</td><td style='text-align:right;'></td></tr></table>
				4519
cristy	c54f5d4	2009-11-27 21:36:31 +0000	[diff] [blame]	4520	<p>The <em class="arg">color</em> argument is defined using the format
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4521	described under the <a href="#fill" >-fill</a> option. The <a href="#fuzz"
				4522	>-fuzz</a> setting can be used to match and replace colors similar to the one
				4523	given.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4524
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4525	<p>Use <a href="#opaque">+opaque</a> to paint any pixel that does not match
				4526	the target color. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4527
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4528	<p>The <a href="#transparent">-transparent</a> operator is exactly the same
				4529	as <a href="#opaque" >-opaque</a> but replaces the matching color with
				4530	transparency rather than the current <a href="#fill">-fill</a> color setting.
				4531	To ensure that it can do this it also ensures that the image has an alpha
				4532	channel enabled, as per "<kbd><a href="#alpha" >-alpha</a> set</kbd>", for
				4533	the new transparent colors, and does not require you to modify the <a
				4534	href="#channel">-channel</a> to enable alpha channel handling. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4535
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4536
				4537	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4538	<h4><a id="orient"></a>-orient <em class="arg">image orientation</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4539	</div>
				4540
				4541	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>specify orientation of a digital camera image.</td><td style='text-align:right;'></td></tr></table>
				4542
				4543	<p>Choose from these orientations:</p>
				4544
				4545	<pre class="text">
				4546	bottom-left
				4547	bottom-right
				4548	left-bottom
				4549	left-top
				4550	right-bottom
				4551	right-top
				4552	top-left
				4553	top-right
				4554	undefined
				4555	</pre>
				4556
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4557	<p>To print a complete list of orientations, use the <a href="#list" >-list
				4558	orientation</a> option.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4559
				4560
				4561	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4562	<h4><a id="page"></a>-page <em class="arg">geometry</em><br/>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4563	-page <em class="arg">media</em>[<em class="arg">offset</em>][{<em class="arg">^!<></em>}]<br/>
				4564	+page
				4565	</h4>
				4566	</div>
				4567
				4568	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the size and location of an image on the larger virtual canvas.</td><td style='text-align:right;'></td></tr></table>
				4569
				4570	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				4571
				4572	<p>For convenience you can specify the page size using <em class="arg">media</em> (see below). Offsets can then be added as with other <em class="arg">geometry</em> arguments (e.g. <a href="#page">-page</a> <kbd>Letter+43+43</kbd>).</p>
				4573
				4574	<p>Use <em class="arg">media</em> as shorthand to specify the dimensions (<em class="arg">width</em>x<em class="arg">height</em>) of the <em class="arg">PostScript</em> page in dots per inch or a TEXT page in pixels. The choices for a PostScript page are:</p>
				4575	<table id="geometryTable" cellpadding="2" cellspacing="0" border="1" width="50%" style="margin-left: auto; margin-right: auto;">
				4576	<thead>
				4577	<tr valign="top">
				4578	<th align="center"><em class="arg">media</em></th>
				4579	<th align="center"><em class="arg">width</em></th>
				4580	<th align="center"><em class="arg">height</em></th>
				4581	</tr>
				4582	</thead>
				4583	<tbody>
				4584	<tr><td align="left"> 11x17 </td> <td align="right"> 792</td> <td align="right"> 1224</td> </tr>
				4585	<tr><td align="left"> Ledger </td> <td align="right"> 1224</td> <td align="right"> 792</td> </tr>
				4586	<tr><td align="left"> Legal </td> <td align="right"> 612</td> <td align="right"> 1008</td> </tr>
				4587	<tr><td align="left"> Letter </td> <td align="right"> 612</td> <td align="right"> 792</td> </tr>
				4588	<tr><td align="left"> LetterSmall</td> <td align="right"> 612</td> <td align="right"> 792</td> </tr>
				4589	<tr><td align="left"> ArchE </td> <td align="right"> 2592</td> <td align="right"> 3456</td> </tr>
				4590	<tr><td align="left"> ArchD </td> <td align="right"> 1728</td> <td align="right"> 2592</td> </tr>
				4591	<tr><td align="left"> ArchC </td> <td align="right"> 1296</td> <td align="right"> 1728</td> </tr>
				4592	<tr><td align="left"> ArchB </td> <td align="right"> 864</td> <td align="right"> 1296</td> </tr>
				4593	<tr><td align="left"> ArchA </td> <td align="right"> 648</td> <td align="right"> 864</td> </tr>
				4594	<tr><td align="left"> A0 </td> <td align="right"> 2380</td> <td align="right"> 3368</td> </tr>
				4595	<tr><td align="left"> A1 </td> <td align="right"> 1684</td> <td align="right"> 2380</td> </tr>
				4596	<tr><td align="left"> A2 </td> <td align="right"> 1190</td> <td align="right"> 1684</td> </tr>
				4597	<tr><td align="left"> A3 </td> <td align="right"> 842</td> <td align="right"> 1190</td> </tr>
				4598	<tr><td align="left"> A4 </td> <td align="right"> 595</td> <td align="right"> 842</td> </tr>
				4599	<tr><td align="left"> A4Small </td> <td align="right"> 595</td> <td align="right"> 842</td> </tr>
				4600	<tr><td align="left"> A5 </td> <td align="right"> 421</td> <td align="right"> 595</td> </tr>
				4601	<tr><td align="left"> A6 </td> <td align="right"> 297</td> <td align="right"> 421</td> </tr>
				4602	<tr><td align="left"> A7 </td> <td align="right"> 210</td> <td align="right"> 297</td> </tr>
				4603	<tr><td align="left"> A8 </td> <td align="right"> 148</td> <td align="right"> 210</td> </tr>
				4604	<tr><td align="left"> A9 </td> <td align="right"> 105</td> <td align="right"> 148</td> </tr>
				4605	<tr><td align="left"> A10 </td> <td align="right"> 74</td> <td align="right"> 105</td> </tr>
				4606	<tr><td align="left"> B0 </td> <td align="right"> 2836</td> <td align="right"> 4008</td> </tr>
				4607	<tr><td align="left"> B1 </td> <td align="right"> 2004</td> <td align="right"> 2836</td> </tr>
				4608	<tr><td align="left"> B2 </td> <td align="right"> 1418</td> <td align="right"> 2004</td> </tr>
				4609	<tr><td align="left"> B3 </td> <td align="right"> 1002</td> <td align="right"> 1418</td> </tr>
				4610	<tr><td align="left"> B4 </td> <td align="right"> 709</td> <td align="right"> 1002</td> </tr>
				4611	<tr><td align="left"> B5 </td> <td align="right"> 501</td> <td align="right"> 709</td> </tr>
				4612	<tr><td align="left"> C0 </td> <td align="right"> 2600</td> <td align="right"> 3677</td> </tr>
				4613	<tr><td align="left"> C1 </td> <td align="right"> 1837</td> <td align="right"> 2600</td> </tr>
				4614	<tr><td align="left"> C2 </td> <td align="right"> 1298</td> <td align="right"> 1837</td> </tr>
				4615	<tr><td align="left"> C3 </td> <td align="right"> 918</td> <td align="right"> 1298</td> </tr>
				4616	<tr><td align="left"> C4 </td> <td align="right"> 649</td> <td align="right"> 918</td> </tr>
				4617	<tr><td align="left"> C5 </td> <td align="right"> 459</td> <td align="right"> 649</td> </tr>
				4618	<tr><td align="left"> C6 </td> <td align="right"> 323</td> <td align="right"> 459</td> </tr>
				4619	<tr><td align="left"> Flsa </td> <td align="right"> 612</td> <td align="right"> 936</td> </tr>
				4620	<tr><td align="left"> Flse </td> <td align="right"> 612</td> <td align="right"> 936</td> </tr>
				4621	<tr><td align="left"> HalfLetter </td> <td align="right"> 396</td> <td align="right"> 612</td> </tr>
				4622	</tbody>
				4623	</table>
				4624
				4625
				4626
				4627
				4628	<p>This option is also used to place subimages when writing to a multi-image format that supports offsets, such as GIF89 and MNG. When used for this purpose the offsets are always measured from the top left corner of the canvas and are not affected by the <a href="#gravity">-gravity</a> option. To position a GIF or MNG image, use <a href="#page">-page</a><em class="arg">{+-}x{+-}y</em> (e.g. -page +100+200). When writing to a MNG file, a <a href="#page">-page</a> option appearing ahead of the first image in the sequence with nonzero width and height defines the width and height values that are written in the <kbd>MHDR</kbd> chunk. Otherwise, the MNG width and height are computed from the bounding box that contains all images in the sequence. When writing a GIF89 file, only the bounding box method is used to determine its dimensions.</p>
				4629
				4630	<p>For a PostScript page, the image is sized as in <a href="#geometry">-geometry</a> but positioned relative to the <em>lower left-hand corner</em> of the page by {+-}<kbd>x</kbd><em class="arg">offset</em>{+-}<kbd>y</kbd> <em class="arg">offset</em>. Use <a href="#page">-page 612x792</a>, for example, to center the image within the page. If the image size exceeds the PostScript page, it is reduced to fit the page. The default gravity for the <a href="#page">-page</a> option is <em class="arg">NorthWest</em>, i.e., positive <kbd>x</kbd> and <kbd>y</kbd> <em class="arg">offset</em> are measured rightward and downward from the top left corner of the page, unless the <a href="#gravity">-gravity</a> option is present with a value other than <em class="arg">NorthWest</em>.</p>
				4631
				4632	<p>The default page dimensions for a TEXT image is 612x792.</p>
				4633
				4634	<p>This option is used in concert with <a href="#density">-density</a>.</p>
				4635
				4636	<p>Use <a href="#page">+page</a> to remove the page settings for an image.</p>
				4637
				4638	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4639	<h4><a id="paint"></a>-paint <em class="arg">radius</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4640	</div>
				4641
				4642	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>simulate an oil painting.</td><td style='text-align:right;'></td></tr></table>
				4643
				4644	<p>Each pixel is replaced by the most frequent color in a circular neighborhood whose width is specified with <em class="arg">radius</em>.</p>
				4645
				4646	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4647	<h4><a id="path"></a>-path <em class="arg">path</em></h4></div>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4648
				4649	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>write images to this path on disk.</td><td style='text-align:right;'></td></tr></table>
				4650
				4651	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4652	<h4><a id="pause_animate_"></a>-pause <em class="arg">seconds</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4653	</div>
				4654
				4655	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Pause between animation loops.</td><td style='text-align:right;'>[<a href="../www/animate.html">animate</a>]</td></tr></table>
				4656
				4657	<p>Pause for the specified number of seconds before repeating the animation.</p>
				4658
				4659	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4660	<h4><a id="pause_import_"></a>-pause <em class="arg">seconds</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4661	</div>
				4662
				4663	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Pause between snapshots.</td><td style='text-align:right;'>[<a href="../www/import.html">import</a>]</td></tr></table>
				4664
				4665	<p>Pause for the specified number of seconds before taking the next snapshot.</p>
				4666
				4667	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4668	<h4><a id="ping"></a>-ping</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4669	</div>
				4670
				4671	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>efficiently determine image characteristics.</td><td style='text-align:right;'></td></tr></table>
				4672
				4673	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4674	<h4><a id="pointsize"></a>-pointsize <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4675	</div>
				4676
				4677	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>pointsize of the PostScript, OPTION1, or TrueType font.</td><td style='text-align:right;'></td></tr></table>
				4678
				4679	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4680	<h4><a id="polaroid"></a>-polaroid <em class="arg">angle</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4681	</div>
				4682
				4683	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>simulate a Polaroid picture.</td><td style='text-align:right;'></td></tr></table>
				4684
				4685	<p>Use <kbd>+polaroid</kbd> to rotate the image at a random angle between -15 and +15 degrees.</p>
				4686
				4687	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4688	<h4><a id="posterize"></a>-posterize <em class="arg">levels</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4689	</div>
				4690
				4691	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>reduce the image to a limited number of color levels.</td><td style='text-align:right;'></td></tr></table>
				4692
				4693	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4694	<h4><a id="precision"></a>-precision <em class="arg">value</em></h4>
cristy	d43a46b	2010-01-21 02:13:41 +0000	[diff] [blame]	4695	</div>
				4696
				4697	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>set the maximum number of significant digits to be printed.</td><td style='text-align:right;'></td></tr></table>
				4698
				4699	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4700	<h4><a id="preview"></a>-preview <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4701	</div>
				4702
				4703	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>image preview type.</td><td style='text-align:right;'></td></tr></table>
				4704
				4705	<p>Use this option to affect the preview operation of an image (e.g. <kbd>convert file.png -preview Gamma Preview:gamma.png</kbd>). Choose from these previews:</p>
				4706
				4707	<pre class="text">
				4708	Rotate
				4709	Shear
				4710	Roll
				4711	Hue
				4712	Saturation
				4713	Brightness
				4714	Gamma
				4715	Spiff
				4716	Dull
				4717	Grayscale
				4718	Quantize
				4719	Despeckle
				4720	ReduceNoise
				4721	Add Noise
				4722	Sharpen
				4723	Blur
				4724	Threshold
				4725	EdgeDetect
				4726	Spread
				4727	Shade
				4728	Raise
				4729	Segment
				4730	Solarize
				4731	Swirl
				4732	Implode
				4733	Wave
				4734	OilPaint
				4735	CharcoalDrawing
				4736	JPEG
				4737	</pre>
				4738
				4739	<p>To print a complete list of previews, use the <a href="#list">-list preview</a> option.</p>
				4740
				4741	<p>The default preview is <kbd>JPEG</kbd>.</p>
				4742
				4743	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4744	<h4><a id="print"></a>-print <em class="arg">string</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4745	</div>
				4746
				4747	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>interpret string and print to console.</td><td style='text-align:right;'></td></tr></table>
				4748
				4749	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4750	<h4><a id="process"></a>-process <em class="arg">command</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4751	</div>
				4752
				4753	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>process the image with a custom image filter.</td><td style='text-align:right;'></td></tr></table>
				4754
				4755	<p>The command arguments has the form <kbd>"module arg1 arg2 arg3 ... argN"</kbd> where <kbd>module</kbd> is the name of the module to invoke (e.g. "Analyze") and arg1 arg2 arg3 ... argN are an arbitrary number of arguments to pass to the process module.</p>
				4756
				4757	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4758	<h4><a id="profile"></a>-profile <em class="arg">filename</em><br/>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4759	+profile <em class="arg">profile_name</em></h4>
				4760	</div>
				4761
				4762	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Manage ICM, IPTC, or generic profiles in an image.</td><td style='text-align:right;'></td></tr></table>
				4763
				4764	<p>Using <a href="#profile">-profile</a> <em class="arg">filename</em> adds an ICM (ICC color management), IPTC (newswire information), or a generic profile to the image.</p>
				4765
				4766	<p>Use <a href="#profile">+profile <em class="arg">profile_name</em></a> to remove the indicated profile. ImageMagick uses standard filename globbing, so wildcard expressions may be used to remove more than one profile. Here we remove all profiles from the image except for the XMP profile: <kbd>+profile "!xmp,*"</kbd>. </p>
				4767
				4768	<p>Use <kbd>identify -verbose</kbd> to find out which profiles are in the image file. Use <a href="#strip">-strip</a> to remove all profiles (and comments).</p>
				4769
				4770	<p>To extract a profile, the <a href="#profile">-profile</a> option is not used. Instead, simply write the file to an image format such as <em class="arg">APP1, 8BImageMagick, ICM,</em> or <em class="arg">IPTC</em>.</p>
				4771
				4772	<p>For example, to extract the Exif data (which is stored in JPEG files in the <em class="arg">APP1</em> profile), use.</p>
				4773
				4774	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert cockatoo.jpg profile.exif</span></p>
				4775	<p>It is important to note that results may depend on whether or not the original image already has an included profile. Also, keep in mind that <a href="#profile">-profile</a> is an "operator" (as opposed to a "setting") and therefore a conversion is made each time it is encountered, in order, in the command-line. For instance, in the following example, if the original image is CMYK with profile, a CMYK-CMYK-RGB conversion results.</p>
				4776
				4777	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert CMYK.tif -profile "CMYK.icc" -profile "RGB.icc" RGB.tiff</span></p>
				4778	<p>Furthermore, since ICC profiles are not necessarily symmetric, extra conversion steps can yield unwanted results.
				4779	CMYK profiles are often very asymmetric since they involve 3−>4 and 4−>3 channel mapping.
				4780	</p>
				4781
cristy	f796427	2011-01-30 03:49:12 +0000	[diff] [blame]	4782	<p>The <a href="#profile">-profile</a> option can also be used to inject
				4783	previously-formatted ancillary chunks into the output PNG file, using
				4784	the commandline option as shown below or by setting the profile via a
				4785	programming interface:
				4786
				4787	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>-profile PNG-chunk-x:<filename></span></p>
				4788	where <em>x</em> is a location flag and
				4789	<em class="arg">filename</em> is a file containing the chunk
				4790	name in the first 4 bytes, then a colon (":"), followed by the chunk data.
				4791	This encoder will compute the chunk length and CRC, so those must not
				4792	be included in the file.
				4793
				4794	"x" can be "b" (before PLTE), "m" (middle, i.e., between PLTE and IDAT),
				4795	or "e" (end, i.e., after IDAT). If you want to write multiple chunks
				4796	of the same type, then add a short unique string after the "x" to prevent
				4797	subsequent profiles from overwriting the preceding ones, e.g.,
				4798
				4799
				4800	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>-profile PNG-chunk-b01:file01 -profile PNG-chunk-b02:file02</span></p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4801	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4802	<h4><a id="quality"></a>-quality <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4803	</div>
				4804
				4805	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>JPEG/MIFF/PNG compression level.</td><td style='text-align:right;'></td></tr></table>
				4806
cristy	851dbce	2010-08-06 21:40:00 +0000	[diff] [blame]	4807	<p>For the JPEG and MPEG image formats, quality is 1 (lowest image quality and highest compression) to 100 (best quality but least effective compression). The default is to use the estimate quality of your input image otherwise 92. Use the <a href="#sampling-factor">-sampling-factor</a> option to specify the factors for chroma downsampling.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4808
				4809	<p>For the MIFF image format, quality/10 is the zlib compression level, which is 0 (worst but fastest compression) to 9 (best but slowest). It has no effect on the image appearance, since the compression is always lossless.</p>
				4810
cristy	851dbce	2010-08-06 21:40:00 +0000	[diff] [blame]	4811	<p>For the JPEG-2000 image format, quality is mapped using a non-linear equation to the compression ratio required by the Jasper library. This non-linear equation is intended to loosely approximate the quality provided by the JPEG v1 format. The default quality value 100, a request for non-lossy compression. A quality of 75 results in a request for 16:1 compression.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4812
cristy	3c98a4f	2010-08-13 20:09:41 +0000	[diff] [blame]	4813	<p>For the MNG and PNG image formats, the quality value sets the zlib compression level (quality / 10) and filter-type (quality % 10). For compression level 0, the Huffman-only strategy is used, which is fastest but not necessarily the worst compression. The default PNG compression is 75.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4814
				4815	<p>If filter-type is 4 or less, the specified filter-type is used for all scanlines:</p>
				4816
				4817	<pre class="text">
				4818	0: none
				4819	1: sub
				4820	2: up
				4821	3: average
				4822	4: Paeth
				4823	</pre>
				4824
				4825	<p>If filter-type is 5, adaptive filtering is used when quality is greater than 50 and the image does not have a color map, otherwise no filtering is used.</p>
				4826
				4827	<p>If filter-type is 6, adaptive filtering with <em class="arg">minimum-sum-of-absolute-values</em> is used.</p>
				4828
				4829	<p>Only if the output is MNG, if filter-type is 7, the LOCO color transformation and adaptive filtering with <em class="arg">minimum-sum-of-absolute-values</em> are used.</p>
				4830
cristy	3c98a4f	2010-08-13 20:09:41 +0000	[diff] [blame]	4831	<p>The quality setting has no effect on the appearance of PNG and MNG images, since the compression is always lossless.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4832
				4833	<p>For further information, see the <a href="http://www.w3.org/pub/WWW/TR">PNG</a> specification.</p>
				4834
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4835	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4836	<h4><a id="quantize"></a>-quantize <em class="arg">colorspace</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4837	</div>
				4838
cristy	3c98a4f	2010-08-13 20:09:41 +0000	[diff] [blame]	4839	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>reduce colors using this colorspace.</td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4840
cristy	3c98a4f	2010-08-13 20:09:41 +0000	[diff] [blame]	4841	<p>This setting defines the colorspace used to sort out and reduce the number
				4842	of colors needed by an image (for later dithering) by operators such as <a
				4843	href="#colors" >-colors</a>, Note that color reducion also happens
				4844	automatically when saving images to color-limited image file formats, such as
				4845	GIF, and PNG8.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4846
				4847
				4848	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4849	<h4><a id="quiet"></a>-quiet</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4850	</div>
				4851
				4852	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>suppress all warning messages. Error messages are still reported.</td><td style='text-align:right;'></td></tr></table>
				4853
				4854	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4855	<h4><a id="radial-blur"></a>-radial-blur <em class="arg">angle</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4856	</div>
				4857
				4858	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Blur around the center of the image.</td><td style='text-align:right;'></td></tr></table>
				4859
				4860	<p>Note that this is actually a rotational blur rather than a radial and as
				4861	such actually mis-named. </p>
				4862
				4863	<p>The <a href="#virtual-pixel">-virtual-pixel</a> setting will determine how
				4864	pixels which are outside the image proper are blurred into the final result.
				4865	</p>
				4866
				4867
				4868	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4869	<h4><a id="raise"></a>-raise <em class="arg">thickness</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4870	</div>
				4871
				4872	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Lighten or darken image edges.</td><td style='text-align:right;'></td></tr></table>
				4873
				4874	<p>This will create a 3-D effect. Use <a href="#raise">-raise</a> to create a raised effect, otherwise use <a href="#raise">+raise</a>.
				4875	</p>
				4876
				4877	<p>Unlike the similar <a href="#frame">-frame</a> option, <a href="#raise">-raise</a> does not alter the dimensions of the image.</p>
				4878
				4879	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4880	<h4><a id="random-threshold"></a>-random-threshold <em class="arg">low</em>x<em class="arg">high</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4881	</div>
				4882
				4883	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Apply a random threshold to the image.</td><td style='text-align:right;'></td></tr></table>
				4884
				4885	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4886	<h4><a id="red-primary"></a>-red-primary <em class="arg">x,y</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4887	</div>
				4888
				4889	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the red chromaticity primary point.</td><td style='text-align:right;'></td></tr></table>
				4890
				4891	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4892	<h4><a id="regard-warnings"></a>-regard-warnings</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4893	</div>
				4894
				4895	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Pay attention to warning messages.</td><td style='text-align:right;'></td></tr></table>
				4896
				4897	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4898	<h4><a id="remap"></a>-remap <em class="arg">filename</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4899	</div>
				4900
				4901	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Reduce the number of colors in an image to the colors used by this image.</td><td style='text-align:right;'></td></tr></table>
				4902
				4903	<p>If the <a href="#dither">-dither</a> setting is enabled (the default) then
				4904	the given colors are dithered over the image as necessary, otherwise the closest
				4905	color (in RGB colorspace) is selected to replace that pixel in the image. </p>
				4906
				4907	<p>As a side effect of applying a <a href="#remap">-remap</a> of colors across all
				4908	images in the current image sequence, all the images will have the same color
				4909	table. That means that when saved to a file format such as GIF, it will use
				4910	that color table as a single common or global color table, for all the images,
				4911	without requiring extra local color tables. </p>
				4912
				4913	<p>Use <a href="#remap">+remap</a> to reduce all images in the current image
				4914	sequence to use a common color map over all the images. This equivalent to
				4915	appending all the images together (without extra background colors) and color
				4916	reducing those images using <a href="#colors">-colors</a> with a 256 color
				4917	limit, then <a href="#remap">-remap</a> those colors over the original list of
				4918	images. This ensures all the images follow a single color map. </p>
				4919
				4920	<p>If the number of colors over all the images is less than 256, then <a
				4921	href="#remap">+remap</a> should not perform any color reduction or dithering, as
				4922	no color changes are needed. In that case, its only effect is to force the use
				4923	of a global color table. This recommended after using either <a
				4924	href="#colors">-colors</a> or <a href="#ordered-dither">-ordered-dither</a> to
				4925	reduce the number of colors in an animated image sequence. </p>
				4926
				4927	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4928	<h4><a id="region"></a>-region <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4929	</div>
				4930
				4931	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set a region in which subsequent operations apply.</td><td style='text-align:right;'></td></tr></table>
				4932
				4933	<p>The <em class="arg">x</em> and <em class="arg">y</em> offsets are treated in the same manner as in <a href="#crop">-crop</a>.</p>
				4934
				4935	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				4936
				4937	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4938	<h4><a id="remote"></a>-remote</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4939	</div>
				4940
				4941	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>perform a remote operation.</td><td style='text-align:right;'></td></tr></table>
				4942
				4943	<p>The only command recognized is the name of an image file to load.</p>
				4944
				4945	<p>If you have more than one <a href="../www/display.html">display</a> application running simultaneously, use the <a href="#window"> window</a> option to specify which application to control.</p>
				4946
				4947	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4948	<h4><a id="render"></a>-render</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4949	</div>
				4950
				4951	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>render vector operations.</td><td style='text-align:right;'></td></tr></table>
				4952
				4953	<p>Use <a href="#render">+render</a> to turn off rendering vector operations. This useful when saving the result to vector formats such as MVG or SVG.</p>
				4954
				4955	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4956	<h4><a id="repage"></a>-repage <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4957	</div>
				4958
				4959	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Adjust the canvas and offset information of the image.</td><td style='text-align:right;'></td></tr></table>
				4960
				4961	<p>This option is like <a href="#page">-page</a> but acts as an image operator
				4962	rather than a setting. You can separately set the canvas size or the offset
				4963	of the image on that canvas by only providing those components. </p>
				4964
				4965	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				4966
				4967	<p>If a <kbd>!</kbd> flag is given the offset given is added to the existing
				4968	offset to move the image relative to its previous position. This useful for
				4969	animation sequences. </p>
				4970
				4971	<p>A given a canvas size of zero such as '<kbd>0x0</kbd>' forces it to
				4972	recalculate the canvas size so the image (at its current offset) will appear
				4973	completely on that canvas (unless it has a negative offset).</p>
				4974
				4975	<p>Use <a href="#repage">+repage</a> to completely remove/reset the virtual
				4976	canvas meta-data from the images. </p>
				4977
				4978	<p>The <a href="#set">-set</a> '<kbd>page</kbd>' option can be used to
				4979	directly assign virtual canvas meta-data. </p>
				4980
				4981
				4982	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4983	<h4><a id="resample"></a>-resample <em class="arg">horizontal</em>x<em class="arg">vertical</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4984	</div>
				4985
				4986	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Resample image to specified horizontal and vertical resolution.</td><td style='text-align:right;'></td></tr></table>
				4987
				4988	<p>Resize the image so that its rendered size remains the same as the original at the specified target resolution. For example, if a 300 DPI image renders at 3 inches by 2 inches on a 300 DPI device, when the image has been resampled to 72 DPI, it will render at 3 inches by 2 inches on a 72 DPI device. Note that only a small number of image formats (e.g. JPEG, PNG, and TIFF) are capable of storing the image resolution. For formats which do not support an image resolution, the original resolution of the image must be specified via <a href="#density">-density</a> on the command line prior to specifying the resample resolution.</p>
				4989
				4990	<p>Note that Photoshop stores and obtains image resolution from a proprietary embedded profile. If this profile exists in the image, then Photoshop will continue to treat the image using its former resolution, ignoring the image resolution specified in the standard file header.</p>
				4991
				4992	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4993	<h4><a id="resize"></a>-resize <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4994	</div>
				4995
				4996	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Resize an image.</td><td style='text-align:right;'></td></tr></table>
				4997
				4998	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument. Offsets, if present in the geometry string, are ignored, and the <a href="#gravity">-gravity</a> option has no effect.</p>
				4999
				5000	<p>If the <a href="#filter">-filter</a> option precedes the <a href="#resize">-resize</a> option, the image is resized with the specified filter.</p>
				5001
cristy	1353896	2010-02-26 17:53:04 +0000	[diff] [blame]	5002	<p>Many image processing algorithms assume your image is in a linear-light coding. If your image is gamma-corrected, you can remove the nonlinear gamma correction, apply the transform, then restore it like this:</p>
				5003
cristy	4949d52	2010-03-12 18:41:34 +0000	[diff] [blame]	5004	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert portrait.jpg -gamma .45455 -resize 25% -gamma 2.2 \ <br/> -quality 92 passport.jpg</span></p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5005	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5006	<h4><a id="respect-parentheses"></a>-respect-parentheses</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5007	</div>
				5008
				5009	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>settings remain in effect until parenthesis boundary.</td><td style='text-align:right;'></td></tr></table>
				5010
				5011	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5012	<h4><a id="reverse"></a>-reverse</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5013	</div>
				5014
				5015	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Reverse the order of images in the current image list.</td><td style='text-align:right;'></td></tr></table>
				5016
				5017
				5018	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5019	<h4><a id="roll"></a>-roll {<em class="arg">+-</em>}<em class="arg">x</em>{<em class="arg">+-</em>}<em class="arg">y</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5020	</div>
				5021
				5022	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>roll an image vertically or horizontally by the amount given.</td><td style='text-align:right;'></td></tr></table>
				5023
				5024	<p>A negative <em class="arg">x</em> offset rolls the image left-to-right. A negative <em class="arg">y</em> offset rolls the image top-to-bottom.</p>
				5025
				5026
				5027	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5028	<h4><a id="rotate"></a>-rotate <em class="arg">degrees</em>{<em class="arg"><</em>}{<em class="arg">></em>}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5029	</div>
				5030
				5031	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Apply Paeth image rotation (using shear operations) to the image.</td><td style='text-align:right;'></td></tr></table>
				5032
				5033	<p>Use <kbd>></kbd> to rotate the image only if its width exceeds the height. <kbd><</kbd> rotates the image <em>only</em> if its width is less than the height. For example, if you specify <kbd>-rotate "-90>"</kbd> and the image size is 480x640, the image is not rotated. However, if the image is 640x480, it is rotated by -90 degrees. If you use <kbd>></kbd> or <kbd><</kbd>, enclose it in quotation marks to prevent it from being misinterpreted as a file redirection.</p>
				5034
				5035	<p>Empty triangles in the corners, left over from rotating the image, are
				5036	filled with the <kbd>background</kbd> color. </p>
				5037
				5038	<p>See also the <a href="#distort">-distort</a> operator and specifically the
				5039	'<kbd>ScaleRotateTranslate</kbd>' distort method. </p>
				5040
				5041
				5042	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5043	<h4><a id="sample"></a>-sample <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5044	</div>
				5045
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5046	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>minify/magnify the image using pixel subsampling and pixel replication, respectively.</td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5047
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5048	<p>Change the image size simply by directly sampling the pixels original
				5049	image. When magnifying, pixels are replicated in blocks. When minifying,
				5050	pixels are sub-sampled (i.e., some rows and columns are skipped over). </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5051
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5052	<p>The results are thus equivalent to using <a href="#resize">-resize</a> with
				5053	a <a href="#filter">-filter</a> setting of <kbd>point</kbd> (nearest
				5054	neighbour), though <a href="#sample">-sample</a> is a lot faster, as it
				5055	avoids all the filter processing of the image. As such it completely ignores
				5056	the current <a href="#filter">-filter</a> setting. </p>
				5057
				5058	<p>The key feature of the <a href="#sample">-sample</a> is that no new colors
				5059	will be added to the resulting image, though some colors may disappear. </p>
				5060
				5061	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument. Offsets, if present in the geometry string, are
				5062	ignored, unlike <a href="#resize">-resize</a>. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5063
				5064
				5065	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5066	<h4><a id="sampling-factor"></a>-sampling-factor <em class="arg">horizontal-factor</em>x<em class="arg">vertical-factor</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5067	</div>
				5068
				5069	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>sampling factors used by JPEG or MPEG-2 encoder and YUV decoder/encoder.</td><td style='text-align:right;'></td></tr></table>
				5070
				5071	<p>This option specifies the sampling factors to be used by the JPEG encoder for chroma downsampling. If this option is omitted, the JPEG library will use its own default values. When reading or writing the YUV format and when writing the M2V (MPEG-2) format, use <a href="#sampling-factor">-sampling-factor 2x1</a> or <a href="#sampling-factor">-sampling-factor 4:2:2</a> to specify the 4:2:2 downsampling method.</p>
				5072
				5073	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5074	<h4><a id="scale"></a>-scale <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5075	</div>
				5076
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5077	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>minify/magnify the image using pixel block averaging and pixel replication, respectively.</td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5078
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5079	<p>Change the image size simply by replacing pixels by averaging pixels
				5080	together when minifying, or replacing pixels when magnifing. </p>
				5081
				5082	<p>The results are thus equivalent to using <a href="#resize">-resize</a> with
				5083	a <a href="#filter">-filter</a> setting of <kbd>box</kbd>. Though it is a lot
				5084	faster, as it avoids all the filter processing of the image. As such it
				5085	completely ignores the current <a href="#filter">-filter</a> setting. </p>
				5086
				5087	<p>If when shrinking (minifying) images the original image is some integer
				5088	multiple of the new image size, the number of pixels avergaed together to
				5089	produce the new pixel color is the same across the whole image. This is
				5090	a special case known as 'binning' and is often used as a method of reducing
				5091	noise in image such as those generated by digital cameras, especially in low
				5092	light conditions. </p>
				5093
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5094
				5095	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5096	<h4><a id="scene"></a>-scene <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5097	</div>
				5098
				5099	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>set scene number.</td><td style='text-align:right;'></td></tr></table>
				5100
				5101	<p>This option sets the scene number of an image or the first image in an image sequence.</p>
				5102
				5103	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5104	<h4><a id="screen"></a>-screen</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5105	</div>
				5106
				5107	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>specify the screen to capture.</td><td style='text-align:right;'></td></tr></table>
				5108
				5109	<p>This option indicates that the GetImage request used to obtain the image should be done on the root window, rather than directly on the specified window. In this way, you can obtain pieces of other windows that overlap the specified window, and more importantly, you can capture menus or other popups that are independent windows but appear over the specified window.</p>
				5110
				5111	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5112	<h4><a id="seed"></a>-seed</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5113	</div>
				5114
				5115	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>seed a new sequence of pseudo-random numbers</td><td style='text-align:right;'></td></tr></table>
				5116
				5117	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5118	<h4><a id="segment"></a>-segment <em class="arg">cluster-threshold</em>x<em class="arg">smoothing-threshold</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5119	</div>
				5120
				5121	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>segment the colors of an image.</td><td style='text-align:right;'></td></tr></table>
				5122
				5123	<p>Segment an image by analyzing the histograms of the color components and identifying units that are homogeneous with the fuzzy c-means technique. This is part of the ImageMagick color quantization routines. </p>
				5124
				5125	<p>Specify <em class="arg">cluster threshold</em> as the number of pixels in each cluster that must exceed the cluster threshold to be considered valid. <em class="arg">Smoothing threshold</em> eliminates noise in the second derivative of the histogram. As the value is increased, you can expect a smoother second derivative. The default is 1.5.</p>
				5126
				5127	<p>If the <a href="#verbose">-verbose</a> setting is defined, a detailed report
				5128	of the color clusters is returned.</p>
				5129
				5130
				5131	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5132	<h4><a id="selective-blur"></a>-selective-blur <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5133	</div>
				5134
cristy	2e2662a	2010-10-09 14:29:37 +0000	[diff] [blame]	5135	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5136	<h4>-selective-blur <em class="arg">radius</em><br />-unsharp <em class="arg">radius</em>x<em class="arg">sigma</em>{<em class="arg">+threshold</em>}</h4>
cristy	2e2662a	2010-10-09 14:29:37 +0000	[diff] [blame]	5137	</div>
				5138
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5139	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Selectively blur pixels within a contrast threshold.</td><td style='text-align:right;'></td></tr></table>
				5140
cristy	2e2662a	2010-10-09 14:29:37 +0000	[diff] [blame]	5141	<p>Blurs those pixels that are less than or equal to the threshold in contrast. The threshold may be expressed as a fraction of <em class="QR">QuantumRange</em> or as a percentage.</p>
				5142
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5143	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5144	<h4><a id="separate"></a>-separate</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5145	</div>
				5146
				5147	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>separate an image channel into a grayscale image. Specify the channel with <a href="#channel">-channel</a>.</td><td style='text-align:right;'></td></tr></table>
				5148
				5149	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5150	<h4><a id="sepia-tone"></a>-sepia-tone <em class="arg">threshold</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5151	</div>
				5152
				5153	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>simulate a sepia-toned photo.</td><td style='text-align:right;'></td></tr></table>
				5154
				5155	<p>Specify <em class="arg">threshold</em> as the percent threshold of the intensity (0 - 99.9%).</p>
				5156
				5157	<p>This option applies a special effect to the image, similar to the effect achieved in a photo darkroom by sepia toning. Threshold ranges from 0 to <em class="QR">QuantumRange</em> and is a measure of the extent of the sepia toning. A threshold of 80% is a good starting point for a reasonable tone.</p>
				5158
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5159
				5160
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5161	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5162	<h4><a id="set"></a>-set <em class="arg">key value</em></h4>
				5163	<h4>+set <em class="arg">key</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5164	</div>
				5165
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5166	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>sets image attributes and properties for images in the current
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5167	image sequence.</td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5168
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5169	<p>This will assign (or modify) specific settings attached to all the images
				5170	in the current image sequence. Using the <a href="#set">+set</a> form of the
				5171	option will either remove, or reset that setting to a default state, as
				5172	appropriate. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5173
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5174	<p>For example, it will modify specific well known image meta-data
				5175	'attributes' such as those normally overridden by: the options <a
				5176	href="#delay" >-delay</a>, <a href="#dispose" >-dispose</a>, and <a
				5177	href="#page" >-page</a>, <a href="#colorspace" >-colorspace</a>; generally
				5178	assigned before the image is read in, by using a <em class="arg">key</em> of
				5179	the same name. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5180
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5181	<p>If the given <em class="arg">key</em> does not match a specific known
				5182	'attribute ', such as shown above, the setting is stored as a a free form
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5183	'properity' string. Such settings are listed in <a href="#verbose"
				5184	>-verbose</a> information ("<kbd>info:</kbd>" output format) as "Properties".
				5185	</p>
				5186
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5187	<p>This includes string 'properities' that are set by and assigned to images
				5188	using the options <a href="#comment" >-comment</a>, <a href="#label"
				5189	>-label</a>, <a href="#caption" >-caption</a>. These options actually assign
				5190	a global 'artifact' which are automatically assigned (and any <a href="../www/escape.html" >Format Percent
				5191	Escapes</a> expanded) to images as they are read in. For example:</p>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5192
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5193	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert rose: -set comment 'Rose is a rose is a rose is a rose' rose.png</span><span class='crtout'>identify -format %c rose.png</span><span class="crtprompt"> $magick> </span><span class='crtin'>Rose is a rose is a rose is a rose</span></p>
				5194	<p>The set value can also make use of <a href="../www/escape.html" >Format and Print Image
				5195	Properties</a> in the defined value. For example:</p>
				5196
				5197	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert rose: -set origsize '%wx%h' -resize 50% \</span><span class='crtout'> -format 'Old size = %[origsize] New size = %wx%h' info:</span><span class="crtprompt"> $magick> </span><span class='crtin'>Old size = 70x46 New size = 35x23</span></p>
				5198	<p>Other well known 'properities' that can be include:
				5199	'<kbd>date:create</kbd>' and '<kbd>date:modify</kbd>' and
				5200	'<kbd>signature</kbd>'. </p>
				5201
				5202	<p>The <a href="#repage">-repage</a> operator will also allow you to modify
				5203	the '<kbd>page</kbd>' attribute of an image for images already in memory (also
				5204	see <a href="#repage">-page</a>). However it is designed to provide a finer
				5205	control of the sub-parts of this 'attribute'. The <a href="#set">-set page</a>
				5206	option will only provide a direct, unmodified assignment of '<kbd>page</kbd>'
				5207	attribute. </p>
				5208
				5209	<p>This option can also associate a colorspace or profile with your image.
				5210	For example,</p>
				5211
				5212	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert image.psd -set profile ISOcoated_v2_eci.icc image-icc.psd</span></p>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5213	<p>Some 'properties' must be defined in a specific way to be used. For
				5214	example only 'properties' prefixed with "<kbd>filename:</kbd>" can be used to
				5215	modify the output filename of an image. For example</p>
				5216
				5217	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert rose: -set filename:mysize '%wx%h' 'rose_%[filename:mysize].png'</span></p>
				5218	<p>If the setting value is prefixed with "<kbd>option:</kbd>" the setting will
				5219	be saved as a global "Artifact" exactly as if it was set using the <a
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5220	href="#define" >-define</a> option. As such settings are globel in scope, they
				5221	can be used to pass 'attributes' and 'properities' of one specific image,
				5222	in a way that allows you to use them in a completely different image, even if
				5223	the original image has long since been modified or destroyed. For example: </p>
				5224
				5225	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert rose: -set option:rosesize '%wx%h' -delete 0 \</span><span class='crtout'> label:'%[rosesize]' label_size_of_rose.gif</span></p>
				5226	<p>Note that <a href="../www/escape.html" >Format Percent Escapes</a> will only match
				5227	a 'artifact' if the given <em class="arg">key</em> does not match an existing
				5228	'attribute' or 'properity'. </p>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5229
				5230	<p>You can set the attributes of the image registry by prefixing the value
				5231	with <kbd>registry:</kbd>.</p>
				5232
				5233
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5234
				5235	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5236	<h4><a id="shade"></a>-shade <em class="arg">azimuth</em>x<em class="arg">elevation</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5237	</div>
				5238
				5239	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>shade the image using a distant light source.</td><td style='text-align:right;'></td></tr></table>
				5240
				5241	<p>Specify <em class="arg">azimuth</em> and <em class="arg">elevation</em> as the position of the light source. Use <a href="#shade">+shade</a> to return the shading results as a grayscale image.</p>
				5242
				5243	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5244	<h4><a id="shadow"></a>-shadow <em class="arg">percent-opacity</em>{x<em class="arg">sigma</em>}{<em class="arg">+-</em>}<em class="arg">x</em>{<em class="arg">+-</em>}<em class="arg">y</em>{<em class="arg">%</em>}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5245	</div>
				5246
				5247	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>simulate an image shadow.</td><td style='text-align:right;'></td></tr></table>
				5248
				5249	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5250	<h4><a
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5251	id="shared-memory"></a>-shared-memory</h4>
				5252	</div>
				5253
				5254	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>use shared memory.</td><td style='text-align:right;'></td></tr></table>
				5255
				5256	<p>This option specifies whether the utility should attempt to use shared memory for pixmaps. ImageMagick must be compiled with shared memory support, and the display must support the <em class="arg">MIT-SHM</em> extension. Otherwise, this option is ignored. The default is <kbd>True</kbd>.</p>
				5257
				5258	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5259	<h4><a id="sharpen"></a>-sharpen <em class="arg">radius</em>{x<em class="arg">sigma</em>}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5260	</div>
				5261
				5262	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>sharpen the image.</td><td style='text-align:right;'></td></tr></table>
				5263
				5264	<p>Use a Gaussian operator of the given radius and standard deviation (sigma).</p>
				5265
				5266	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5267	<h4><a id="shave"></a>-shave <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5268	</div>
				5269
				5270	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Shave pixels from the image edges.</td><td style='text-align:right;'></td></tr></table>
				5271
				5272	<p>The <em class="arg">size</em> portion of the <em class="arg">geometry</em> argument specifies the width of the region to be removed from both sides of the image and the height of the regions to be removed from top and bottom. Offsets are ignored.</p>
				5273
				5274	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				5275
				5276	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5277	<h4><a id="shear"></a>-shear <em class="arg">Xdegrees</em>[x<em class="arg">Ydegrees</em>]</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5278	</div>
				5279
				5280	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Shear the image along the x-axis and/or y-axis.</td><td style='text-align:right;'></td></tr></table>
				5281
				5282	<p>The shear angles may be positive, negative, or zero. When <em class="arg">Ydegrees</em> is omitted it defaults to 0. When both angles are given, the horizontal component of the shear is performed before the vertical component.</p>
				5283
				5284	<p>Shearing slides one edge of an image along the x-axis or y-axis (i.e., horizontally or vertically, respectively),creating a parallelogram. The amount of each is controlled by the respective shear angle. For horizontal shears, <em class="arg">Xdegrees</em> is measured clockwise relative to "up" (the negative y-axis), sliding the top edge to the right when 0°<<em class="arg">Xdegrees</em><90° and to the left when 90°<<em class="arg">Xdegrees</em><180°. For vertical shears <em class="arg">Ydegrees</em> is measured clockwise relative to "right" (the positive x-axis), sliding the right edge down when 0°<<em class="arg">Ydegrees</em><90° and up when 90°<<em class="arg">Ydegrees</em><180°.</p>
				5285
				5286	<p>Empty triangles left over from shearing the image are filled with the color defined by the <a href="#fill">-background</a> option. The color is specified using the format described under the <a href="#fill">-fill</a> option.</p>
				5287
				5288	<p>The horizontal shear is performed before the vertical part. This is important to note, since horizontal and vertical shears do not <em>commute</em>, i.e., the order matters in a sequence of shears. For example, the following two commands are not equivalent.</p>
				5289
				5290	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert logo: -shear 20x0 -shear 0x60 logo-sheared.png</span><span class='crtout'></span><span class="crtprompt"> $magick> </span><span class='crtin'>convert logo: -shear 0x60 -shear 20x0 logo-sheared.png</span></p>
				5291	<p>The first of the two commands above is equivalent to the following, except for the amount of empty space created; the command that follows generates a smaller image, and so is a better choice in terms of time and space.</p>
				5292
				5293	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert logo: -shear 20x60 logo-sheared.png</span></p>
				5294	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5295	<h4><a id="sigmoidal-contrast"></a>-sigmoidal-contrast <em class="arg">contrast</em>x<em class="arg">mid-point</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5296	</div>
				5297
				5298	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>increase the contrast without saturating highlights or shadows.</td><td style='text-align:right;'></td></tr></table>
				5299
				5300	<p>Increase the contrast of the image using a sigmoidal transfer function without saturating highlights or shadows. <em class="arg">Contrast</em> indicates how much to increase the contrast (0 is none; 3 is typical; 20 is a lot); <em class="arg">mid-point</em> indicates where midtones fall in the resultant image (0 is white; 50% is middle-gray; 100% is black). By default the image contrast is increased, use <em class="arg">+sigmoidal-contrast</em> to decrease the contrast.</p>
				5301
				5302	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5303	<h4><a id="silent"></a>-silent</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5304	</div>
				5305
				5306	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>operate silently.</td><td style='text-align:right;'></td></tr></table>
				5307
				5308	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5309	<h4><a id="size"></a>-size <em class="arg">width</em>[x<em class="arg">height</em>][<em class="arg">+offset</em>]</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5310	</div>
				5311
				5312	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>set the width and height of the image.</td><td style='text-align:right;'></td></tr></table>
				5313
				5314	<p>Use this option to specify the width and height of raw images whose dimensions are unknown such as <kbd>GRAY</kbd>, <kbd>RGB</kbd>, or <kbd>CMYK</kbd>. In addition to width and height, use <a href="#size">-size</a> with an offset to skip any header information in the image or tell the number of colors in a <kbd>MAP</kbd> image file, (e.g. -size 640x512+256).</p>
				5315
				5316	<p>For Photo CD images, choose from these sizes:</p>
				5317
				5318	<pre class="text">
				5319	192x128
				5320	384x256
				5321	768x512
				5322	1536x1024
				5323	3072x2048
				5324	</pre>
				5325
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5326	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5327	<h4><a id="sketch"></a>-sketch <em class="arg">radius</em><br />-sketch <em class="arg">radius</em>x<em class="arg">sigma</em>+<em class="arg">angle</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5328	</div>
				5329
				5330	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>simulate a pencil sketch.</td><td style='text-align:right;'></td></tr></table>
				5331
				5332	<p>Sketch with the given radius, standard deviation (sigma), and angle. The angle given is the angle toward which the image is sketched. That is the direction people would consider the object is coming from. </p>
				5333
				5334	<div style="margin: auto;">
cristy	2d67ddd	2011-02-13 15:38:23 +0000	[diff] [blame^]	5335	<h4><a id="smush"></a>-smush <em class="arg">offset</em></h4>
				5336	</div>
				5337
				5338	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>smush an image sequence together.</td><td style='text-align:right;'></td></tr></table>
				5339
				5340	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5341	<h4><a id="snaps"></a>-snaps <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5342	</div>
				5343
				5344	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the number of screen snapshots.</td><td style='text-align:right;'>[<a href="../www/import.html">import</a>]</td></tr></table>
				5345
				5346	<p>Use this option to grab more than one image from the X server screen, to create an animation sequence.</p>
				5347
				5348	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5349	<h4><a id="solarize"></a>-solarize <em class="arg">threshold</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5350	</div>
				5351
				5352	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>negate all pixels above the threshold level.</td><td style='text-align:right;'></td></tr></table>
				5353
				5354	<p>Specify <em class="arg">factor</em> as the percent threshold of the intensity (0 - 99.9%).</p>
				5355
				5356	<p>This option produces a <em class="arg">solarization</em> effect seen when exposing a photographic film to light during the development process.</p>
				5357
				5358	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5359	<h4><a id="sparse-color"></a>-sparse-color <em
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5360	class="arg">method</em> '<em class="arg">x</em>,<em class="arg">y</em> <em class="arg">color</em> ...'</h4>
				5361	</div>
				5362
				5363	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'> color the given image using the specified points of color, and filling the other intervening colors using the given methods. </td><td style='text-align:right;'></td></tr></table>
				5364
				5365
				5366	<table class="doc">
				5367	<tbody>
				5368	<tr valign="top">
				5369	<th align="left" style="width: 8%">Method</th>
				5370	<th align="left">Description</th>
				5371	</tr>
				5372
				5373	<tr valign="top">
				5374	<td valign="top">voronoi</td>
				5375	<td valign="top">Simply map each pixel to the to nearest color point
				5376	given. The result are polygonal 'cells' of solid color. </td>
				5377	</tr>
				5378
				5379	<tr valign="top">
				5380	<td valign="top">shepards</td>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5381	<td valign="top">Colors points biased on the ratio of inverse distance
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5382	squared. Generating spots of color in a sea of the average of
				5383	colors. </td>
				5384	</tr>
				5385
				5386	<tr valign="top">
				5387	<td valign="top">barycentric</td>
				5388	<td valign="top">three point triangle of color given 3 points.
				5389	Giving only 2 points will form a linear gradient between those points.
				5390	Gradient is however not restricted to just the triangle or line. </td>
				5391	</tr>
				5392
				5393	<tr valign="top">
				5394	<td valign="top">bilinear</td>
				5395	<td valign="top">Like barycentric but for 4 points. Less than 4 points
				5396	fall back to barycentric. </td>
				5397	</tr>
				5398
				5399	</tbody>
				5400	</table>
				5401
				5402	<p>The points are placed according to the images location on the virtual
				5403	canvas (<a href="#page" >-page</a> or <a href="#repage" >-repage</a>
				5404	offset), and do not actually have to exist on the given image, but may be
				5405	some point beyond the edge of the image. All points are floating point values.
				5406	</p>
				5407
				5408	<p>Only the color channels defined by the <a href="#channel" >-channel</a> are
				5409	modified, whcih means the matte/alpha transparency channel is not effected by
				5410	default. If enabled, the image also needs a the matte/alpha channel to be
				5411	enabled for this operator to effect an images transparency. This is typical
				5412	transparency handling for images. </p>
				5413
				5414	<p>All the above methods when given a single point of color will replace all
				5415	the colors in the image with the color given, regardless of the point. This is
				5416	logical, and provides an alternative technique to recolor a image to some
				5417	default value. </p>
				5418
				5419
				5420	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5421	<h4><a id="splice"></a>-splice <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5422	</div>
				5423
				5424	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Splice the current background color into the image.</td><td style='text-align:right;'></td></tr></table>
				5425
				5426	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument. See <a href="#background">-background</a> to reset the background color.</p>
				5427
				5428	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5429	<h4><a id="spread"></a>-spread <em class="arg">amount</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5430	</div>
				5431
				5432	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>displace image pixels by a random amount.</td><td style='text-align:right;'></td></tr></table>
				5433
				5434	<p>The argument <em class="arg">amount</em> defines the size of the neighborhood around each pixel from which to choose a candidate pixel to swap.</p>
				5435
				5436	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5437	<h4><a id="stegano"></a>-stegano <em class="arg">offset</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5438	</div>
				5439
				5440	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>hide watermark within an image.</td><td style='text-align:right;'></td></tr></table>
				5441
				5442	<p>Use an offset to start the image hiding some number of pixels from the beginning of the image. Note this offset and the image size. You will need this information to recover the steganographic image (e.g. display -size 320x256+35 stegano:image.png).</p>
				5443
				5444	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5445	<h4><a id="stereo"></a>-stereo <em class="arg">+x</em>{<em class="arg">+y</em>}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5446	</div>
				5447
				5448	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>composite two images to create a stereo anaglyph.</td><td style='text-align:right;'>[<a href="../www/composite.html">composite</a>]</td></tr></table>
				5449
				5450	<p>The left side of the stereo pair is saved as the red channel of the output image. The right side is saved as the green channel. Red-green stereo glasses are required to properly view the stereo image.</p>
				5451
				5452	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5453	<h4><a id="storage-type"></a>-storage-type <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5454	</div>
				5455
				5456	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>pixel storage type. Here are the valid types:</td><td style='text-align:right;'></td></tr></table>
				5457
				5458	<pre class="text">
				5459	char store pixels as unsigned characters
				5460	double store pixels as doubles
				5461	float store pixels as floats
				5462	integer store pixels as integers
				5463	long store pixels as longs
				5464	quantum store pixels in the native depth of your ImageMagick distribution
				5465	short store pixels as unsigned shorts
				5466	</pre>
				5467
				5468	<p>Float and double types are normalized from 0.0 to 1.0 otherwise the pixels
				5469	values range from 0 to the maximum value the storage type can support.</p>
				5470
				5471	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5472	<h4><a id="stretch"></a>-stretch <em class="arg">fontStretch</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5473	</div>
				5474
				5475	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set a type of stretch style for fonts.</td><td style='text-align:right;'></td></tr></table>
				5476
				5477	<p>This setting suggests a type of stretch that ImageMagick should try to apply to the currently selected font family. Select <em class="arg">fontStretch</em> from the following.</p>
				5478
				5479	<pre class="text">
				5480	Any
				5481	Condensed
				5482	Expanded
				5483	ExtraCondensed
				5484	ExtraExpanded
				5485	Normal
				5486	SemiCondensed
				5487	SemiExpanded
				5488	UltraCondensed
				5489	UltraExpanded
				5490	</pre>
				5491
				5492	<p>To print a complete list of stretch types, use <a href="#list">-list stretch</a>.</p>
				5493
				5494	<p>For other settings that affect fonts, see the options <a href="#font">-font</a>, <a href="#family">-family</a>, <a href="#style">-style</a>, and <a href="#weight">-weight</a>. </p>
				5495
				5496	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5497	<h4><a id="strip"></a>-strip</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5498	</div>
				5499
				5500	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>strip the image of any profiles or comments.</td><td style='text-align:right;'></td></tr></table>
				5501
				5502	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5503	<h4><a id="stroke"></a>-stroke <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5504	</div>
				5505
				5506	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>color to use when stroking a graphic primitive.</td><td style='text-align:right;'></td></tr></table>
				5507
				5508	<p>The color is specified using the format described under the <a href="#fill">-fill</a> option.</p>
				5509
				5510	<p>See <a href="#draw">-draw</a> for further details.</p>
				5511
				5512	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5513	<h4><a id="strokewidth"></a>-strokewidth <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5514	</div>
				5515
				5516	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>set the stroke width.</td><td style='text-align:right;'></td></tr></table>
				5517
				5518	<p>See <a href="#draw">-draw</a> for further details.</p>
				5519
				5520	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5521	<h4><a id="style"></a>-style <em class="arg">fontStyle</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5522	</div>
				5523
				5524	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set a font style for text.</td><td style='text-align:right;'></td></tr></table>
				5525
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	5526	<p>This setting suggests a font style that ImageMagick should try to apply to
				5527	the currently selected font family. Select <em class="arg">fontStyle</em> from
				5528	the following.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5529
				5530	<pre class="text">
				5531	Any
				5532	Italic
				5533	Normal
				5534	Oblique
				5535	</pre>
				5536
				5537	<p>For other settings that affect fonts, see the options <a href="#font">-font</a>, <a href="#family">-family</a>, <a href="#stretch">-stretch</a>, and <a href="#weight">-weight</a>. </p>
				5538
				5539	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5540	<h4><a id="subimage-search"></a>-subimage-search</h4>
cristy	ae6203d	2010-08-09 01:12:14 +0000	[diff] [blame]	5541	</div>
				5542
cristy	d4d64ed	2010-08-22 22:19:33 +0000	[diff] [blame]	5543	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>search for subimage.</td><td style='text-align:right;'>[<a href="../www/compare.html">compare</a>]</td></tr></table>
				5544
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	5545	<p>This option is required to have compare search for the best match location
				5546	of a small image within a larger image. This search will produce two images
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5547	(or two frames). The first is the "difference" image and the second will
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	5548	be the "match score" image.</p>
				5549
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5550	<p>The "match-score" image is smaller containing a pixel for ever possible
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	5551	position of the top-left corner of the given sub-image. that is its size will
				5552	be the size of the larger_image - sub_image + 1. The brightest location in
				5553	this image is the location s the locate on the best match that is also
				5554	reported. Note that this may or may nor be a perfect match, and the actual
				5555	brightness will reflect this. Other bright 'peaks' can be used to locate other
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5556	possible matching loctions. </p>
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	5557
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5558	<p>Note that the search will try to compare teh sub-image at every possible
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	5559	location in the larger image, as such it can be very slow. The smaller the
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5560	sub-image the faster this search is. </p>
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	5561
cristy	ae6203d	2010-08-09 01:12:14 +0000	[diff] [blame]	5562
				5563	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5564	<h4><a id="swap"></a>-swap <em class="arg">index,index</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5565	</div>
				5566
				5567	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Swap the positions of two images in the image sequence.</td><td style='text-align:right;'></td></tr></table>
				5568
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	5569	<p>For example, <a href="#swap">-swap 0,2</a> swaps the first and the third
				5570	images in the current image sequence. Use <a href="#swap">+swap</a> to switch
				5571	the last two images in the sequence.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5572
				5573	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5574	<h4><a id="swirl"></a>-swirl <em class="arg">degrees</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5575	</div>
				5576
				5577	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>swirl image pixels about the center.</td><td style='text-align:right;'></td></tr></table>
				5578
				5579	<p><em class="arg">Degrees</em> defines the tightness of the swirl.</p>
				5580
				5581	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5582	<h4><a id="synchronize"></a>-synchronize</h4>
cristy	5063d81	2010-10-19 16:28:10 +0000	[diff] [blame]	5583	</div>
				5584
				5585	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>synchronize image to storage device.</td><td style='text-align:right;'></td></tr></table>
				5586
				5587	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5588	<h4><a id="taint"></a>-taint</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5589	</div>
				5590
cristy	5063d81	2010-10-19 16:28:10 +0000	[diff] [blame]	5591	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Mark the image as modified.</td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5592
				5593	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5594	<h4><a id="text-font"></a>-text-font <em class="arg">name</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5595	</div>
				5596
				5597	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>font for writing fixed-width text.</td><td style='text-align:right;'></td></tr></table>
				5598
				5599	<p>Specifies the name of the preferred font to use in fixed (typewriter style) formatted text. The default is 14 point <em class="arg">Courier</em>.</p>
				5600
				5601	<p>You can tag a font to specify whether it is a PostScript, TrueType, or OPTION1 font. For example, <kbd>Courier.ttf</kbd> is a TrueType font and <kbd>x:fixed</kbd> is OPTION1.</p>
				5602
				5603	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5604	<h4><a id="texture"></a>-texture <em class="arg">filename</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5605	</div>
				5606
				5607	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>name of texture to tile onto the image background.</td><td style='text-align:right;'></td></tr></table>
				5608
				5609	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5610	<h4><a id="threshold"></a>-threshold <em class="arg">value</em>{<em class="arg">%</em>}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5611	</div>
				5612
				5613	<!-- {<em class="arg">green,blue,opacity</em>}
				5614	<p>If the green or blue value is omitted, these channels use the same value as the first one provided. If all three color values are the same, the result is a bi-level image. If the opacity threshold is omitted, OpaqueOpacity is used and any partially transparent pixel becomes fully transparent.</p>
				5615	-->
				5616
				5617	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Apply simultaneous black/white threshold to the image.</td><td style='text-align:right;'></td></tr></table>
				5618
				5619	<p>Any pixel values (more specifically, those channels set using <a href="../www/command-line-options.html#channel">‑channel</a>) that exceed the specified threshold are reassigned the maximum channel value, while all other values are assigned the minimum.</p>
				5620
				5621	<p> The threshold value can be given as a percentage or as an absolute integer value corresponding to the desired channel value. When given as an integer, the minimum attainable value is 0 (corresponding to black when all channels are affected), but the maximum value (corresponding to white) is that of the <kbd>quantum depth</kbd> of the particular build of ImageMagick, and is therefore dependent on the installation. For that reason, a reasonable recommendation for most applications is to specify the threshold values as a percentage.
				5622	</p>
				5623
				5624	<p> The following would force pixels with red values above 50% to have 100% red values, while those at or below 50% red would be set to 0 in the red channel. The green, blue, and alpha channels (if present) would be unchanged. </p>
				5625
				5626	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert in.png -channel red -threshold 50% out.png</span></p>
				5627	<p>As (possibly) impractical but instructive examples, the following would generate an all-black and an all-white image with the same dimensions as the input image.</p>
				5628
				5629
				5630	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert in.png -threshold 100% black.png</span><span class='crtout'></span><span class="crtprompt"> $magick> </span><span class='crtin'>convert in.png -threshold -1 white.png</span></p>
				5631	<p>Note that the values of the transparency channel is treated as 'matte'
				5632	values (0 is opaque) and not as 'alpha' values (0 is transparent).</p>
				5633
				5634	<p> See also <a href="../www/command-line-options.html#black-threshold">‑black‑threshold</a> and <a href="../www/command-line-options.html#white-threshold">‑white‑threshold</a>.
				5635	</p>
				5636
				5637	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5638	<h4><a id="thumbnail"></a>-thumbnail <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5639	</div>
				5640
				5641	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Create a thumbnail of the image.</td><td style='text-align:right;'></td></tr></table>
				5642
				5643	<p>This is similar to <a href="#resize">-resize</a>, except it is optimized for speed and any image profile, other than a color profile, is removed to reduce the thumbnail size. To strip the color profiles as well, add <a href="#strip">-strip</a> just before of after this option.</p>
				5644
				5645	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				5646
				5647	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5648	<h4><a id="tile"></a>-tile <em class="arg">filename</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5649	</div>
				5650
				5651	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the tile image used for filling a subsequent graphic primitive.</td><td style='text-align:right;'></td></tr></table>
				5652
				5653	<div style="margin: auto;">
				5654	<h4>-tile <em class="arg">geometry</em></h4>
				5655	</div>
				5656
				5657	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Specify the layout of images .</td><td style='text-align:right;'>[<a href="../www/montage.html">montage</a>]</td></tr></table>
				5658
				5659	<p>See <a href="../www/command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				5660
				5661	<div style="margin: auto;">
				5662	<h4>-tile</h4>
				5663	</div>
				5664
				5665	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Specifies that a subsequent composite operation is repeated across and down image.</td><td style='text-align:right;'>[<a href="../www/composite.html">composite</a>]</td></tr></table>
				5666
				5667	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5668	<h4><a id="tile-offset"></a>-tile-offset {<em class="arg">+-</em>}<em class="arg">x</em>{<em class="arg">+-</em>}<em class="arg">y</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5669	</div>
				5670
				5671	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Specify the offset for tile images, relative to the background image it is tiled on.</td><td style='text-align:right;'></td></tr></table>
				5672
				5673	<p>This should be set before the tiling image is set by <a href="#tile" >-tile</a> or <a href="#texture" >-texture</a>, or directly applied for creating a tiled canvas using <kbd>TILE:</kbd> or <kbd>PATTERN:</kbd> input formats. </p>
				5674
				5675	<p>Internally ImageMagick does a <a href="#roll" >-roll</a> of the tile image by the arguments given when the tile image is set. </p>
				5676
				5677	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5678	<h4><a id="tint"></a>-tint <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5679	</div>
				5680
				5681	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Tint the image with the fill color.</td><td style='text-align:right;'></td></tr></table>
				5682
				5683	<p>Tint the image with the fill color.</p>
				5684
				5685	<p>Specify the amount of tinting as a percentage. Pure colors like black, white red, yellow, will not be affected by -tint. Only mid-range colors such as the various shades of grey.</p>
				5686
				5687	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5688	<h4><a id="title"></a>-title <em class="arg">string</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5689	</div>
				5690
				5691	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Assign a title to displayed image.</td><td style='text-align:right;'>[<a href="../www/animate.html">animate</a>, <a href="../www/display.html">display</a>, <a href="../www/montage.html">montage</a>]</td></tr></table>
				5692
				5693	<p>Use this option to assign a specific title to the image. This assigned to the image window and is typically displayed in the window title bar. Optionally you can include the image filename, type, width, height, Exif data, or other image attribute by embedding special format characters described under the <a href="#format">-format</a> option.</p>
				5694
				5695	<p>For example,</p>
				5696
				5697	<p class="crtsnip">
				5698	-title "%m:%f %wx%h"
				5699	</p>
				5700
				5701	<p>produces an image title of <kbd>MIFF:bird.miff 512x480</kbd> for an image titled <kbd>bird.miff</kbd> and whose width is 512 and height is 480.</p>
				5702
				5703
				5704	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5705	<h4><a id="transform"></a>-transform</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5706	</div>
				5707
				5708	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>transform the image.</td><td style='text-align:right;'></td></tr></table>
				5709
				5710	<p>This option applies the transformation matrix from a previous <a href="#affine">-affine</a> option.</p>
				5711
				5712	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert -affine 2,2,-2,2,0,0 -transform bird.ppm bird.jpg</span></p>
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	5713
				5714	<p>This operator has been now been superseded by the <a
				5715	href="#distort">-distort</a> '<kbd>AffineProjection</kbd>' method. </p>
				5716
				5717
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5718	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5719	<h4><a id="transparent"></a>-transparent <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5720	</div>
				5721
				5722	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Make this color transparent within the image.</td><td style='text-align:right;'></td></tr></table>
				5723
				5724	<p>The <em class="arg">color</em> argument is defined using the format
				5725	described under the <a href="#fill">-fill</a> option. The <a href="#fuzz"
				5726	>-fuzz</a> setting can be used to match and replace colors similar to the one
				5727	given. </p>
				5728
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	5729	<p>Use <a href="#transparent" >+transparent</a> to invert the pixels matched.
				5730	that is make all non-matching colors transparent. </p>
				5731
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5732	<p>The <a href="#opaque">-opaque</a> operator is exactly the same as <a
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	5733	href="#transparent" >-transparent</a> but replaces the matching color with the
				5734	current <a href="#fill">-fill</a> color setting, rather than transparent.
				5735	However the <a href="#transparent" >-transparent</a> operator also ensures
				5736	that the image has an alpha channel enabled, as per "<kbd><a href="#alpha"
				5737	>-alpha</a> set</kbd>", and does not require you to modify the <a
				5738	href="#channel">-channel</a> to enable alpha channel handling. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5739
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	5740	<p>Note that this does not define the color as being the 'transparency color'
				5741	used for color-mapped image formats, such as GIF. For that use <a
				5742	href="#transparent-color" >-transparent-color</a> </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5743
				5744
				5745	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5746	<h4><a id="transparent-color"></a>-transparent-color <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5747	</div>
				5748
				5749	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set the transparent color.</td><td style='text-align:right;'></td></tr></table>
				5750
				5751	<p>Sometimes this is used for saving to image formats such as
				5752	GIF and PNG8 which uses this color to represent boolean transparency. This
				5753	does not make a color transparent, it only defines what color the transparent
				5754	color is in the color palette of the saved image. Use <a
				5755	href="#transparent">-transparent</a> to make an opaque color transparent.</p>
				5756
				5757	<p>This option allows you to have both an opaque visible color, as well as a
				5758	transparent color of the same color value without conflict. That is, you can
				5759	use the same color for both the transparent and opaque color areas within an
				5760	image. This, in turn, frees to you to select a transparent color that is
				5761	appropriate when an image is displayed by an application that does not handle a
				5762	transparent color index, while allowing ImageMagick to correctly handle images of this
				5763	type. </p>
				5764
				5765	<p>The default transparent color is <kbd>#00000000</kbd>, which is fully transparent black.</p>
				5766
				5767	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5768	<h4><a id="transpose"></a>-transpose</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5769	</div>
				5770
				5771	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Mirror the image along the top-left to bottom-right diagonal.</td><td style='text-align:right;'></td></tr></table>
				5772
				5773	<p> This option mathematically transposes the pixel array. It is equivalent to the sequence <kbd>-flip -rotate 90</kbd>.
				5774	</p>
				5775
				5776	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5777	<h4><a id="transverse"></a>-transverse</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5778	</div>
				5779
				5780	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Mirror the image along the images bottom-left top-right diagonal. Equivalent to the operations <kbd>-flop -rotate 90</kbd>.</td><td style='text-align:right;'></td></tr></table>
				5781
				5782
				5783	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5784	<h4><a id="treedepth"></a>-treedepth <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5785	</div>
				5786
				5787	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>tree depth for the color reduction algorithm.</td><td style='text-align:right;'></td></tr></table>
				5788
				5789	<p>Normally, this integer value is zero or one. A value of zero or one causes the use of an optimal tree depth for the color reduction algorithm.</p>
				5790
				5791	<p>An optimal depth generally allows the best representation of the source image with the fastest computational speed and the least amount of memory. However, the default depth is inappropriate for some images. To assure the best representation, try values between 2 and 8 for this parameter. Refer to the <a href="../www/quantize.html">color reduction algorithm</a> for more details.</p>
				5792
				5793	<p>The <a href="#colors">-colors</a> or <a href="#monochrome">-monochrome</a> option, or writing to an image format which requires color reduction, is required for this option to take effect.</p>
				5794
				5795	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5796	<h4><a id="trim"></a>-trim</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5797	</div>
				5798
				5799	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>trim an image.</td><td style='text-align:right;'></td></tr></table>
				5800
				5801	<p>This option removes any edges that are exactly the same color as the corner pixels. Use <a href="#fuzz">-fuzz</a> to make <a href="#trim">-trim</a> remove edges that are nearly the same color as the corner pixels.</p>
				5802
				5803	<p>The page or virtual canvas information of the image is preserved allowing
				5804	you to extract the result of the <a href="#trim">-trim</a> operation from the
				5805	image. Use a <a href="#repage">+repage</a> to remove the virtual canvas page
				5806	information if it is unwanted.</p>
				5807
				5808	<p>If the trimmed image 'disappears' an warning is produced, and a special
				5809	single pixel transparent 'missed' image is returned, in the same way as when a
				5810	<a href="#crop">-crop</a> operation 'misses' the image proper. </p>
				5811
				5812
				5813	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5814	<h4><a id="type"></a>-type <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5815	</div>
				5816
				5817	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>the image type.</td><td style='text-align:right;'></td></tr></table>
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	5818	<p>Choose from: <kbd>Bilevel</kbd>, <kbd>Grayscale</kbd>, <kbd>GrayscaleMatte</kbd>, <kbd>Palette</kbd>, <kbd>PaletteMatte</kbd>, <kbd>TrueColor</kbd>, <kbd>TrueColorMatte</kbd>, <kbd>ColorSeparation</kbd>, or <kbd>ColorSeparationMatte</kbd>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5819
				5820	<p>Normally, when a format supports different subformats such as grayscale and truecolor, the encoder will try to choose an efficient subformat. The <a href="#type">-type</a> option can be used to overrride this behavior. For example, to prevent a JPEG from being written in grayscale format even though only gray pixels are present, use.</p>
				5821
				5822	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert bird.png -type TrueColor bird.jpg</span></p>
				5823	<p>Similarly, use <a href="#type">-type TrueColorMatte</a> to force the encoder to write an alpha channel even though the image is opaque, if the output format supports transparency.</p>
				5824
				5825	<p>Use <a href="#type">-type optimize</a> to ensure the image is written in the smallest possible file size.</p>
				5826
				5827	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5828	<h4><a id="undercolor"></a>-undercolor <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5829	</div>
				5830
				5831	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>set the color of the annotation bounding box.</td><td style='text-align:right;'></td></tr></table>
				5832
				5833	<p>The color is specified using the format described under the <a href="#fill">-fill</a> option.</p>
				5834
				5835	<p>See <a href="#draw">-draw</a> for further details.</p>
				5836
				5837
				5838	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5839	<h4><a id="update"></a>-update <em class="arg">seconds</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5840	</div>
				5841
				5842	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>detect when image file is modified and redisplay.</td><td style='text-align:right;'></td></tr></table>
				5843
				5844	<p>Suppose that while you are displaying an image the file that is currently displayed is over-written. <kbd>display</kbd> will automagically detect that the input file has been changed and update the displayed image accordingly.</p>
				5845
				5846
				5847	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5848	<h4><a id="unique-colors"></a>-unique-colors</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5849	</div>
				5850
				5851	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>discard all but one of any pixel color.</td><td style='text-align:right;'></td></tr></table>
				5852
				5853
				5854	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5855	<h4><a id="units"></a>-units <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5856	</div>
				5857
				5858	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>the units of image resolution.</td><td style='text-align:right;'></td></tr></table>
				5859
				5860	<p>Choose from: <kbd>Undefined</kbd>, <kbd>PixelsPerInch</kbd>, or <kbd>PixelsPerCentimeter</kbd>. This option is normally used in conjunction with the <a href="#density">-density</a> option.</p>
				5861
				5862
				5863	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5864	<h4><a id="unsharp"></a>-unsharp <em class="arg">radius</em><br />-unsharp <em class="arg">radius</em>x<em class="arg">sigma</em>{<em class="arg">+amount</em>}{<em class="arg">+threshold</em>}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5865	</div>
				5866
				5867	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>sharpen the image with an unsharp mask operator.</td><td style='text-align:right;'></td></tr></table>
				5868
				5869	<p>The <a href="#unsharp">-unsharp</a> option sharpens an image. The image is convolved with a Gaussian operator of the given radius and standard deviation (sigma). For reasonable results, radius should be larger than sigma. Use a radius of 0 to have the method select a suitable radius.</p>
				5870
				5871	<p>The parameters are:</p>
				5872
				5873	<pre class="text">
				5874	radius: The radius of the Gaussian, in pixels, not counting the center
				5875	pixel (default 0).
				5876	sigma: The standard deviation of the Gaussian, in pixels (default 1.0).
				5877	amount: The fraction of the difference between the original and the blur
				5878	image that is added back into the original (default 1.0).
				5879	threshold: The threshold, as a fraction of <em class="QR">QuantumRange</em>, needed to apply the
				5880	difference amount (default 0.05).
				5881	</pre>
				5882
				5883
				5884	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5885	<h4><a id="verbose"></a>-verbose</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5886	</div>
				5887
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5888	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>print detailed information about the image when this option precedes the <a href="#identify">-identify</a> option or <kbd>info:</kbd>.</td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5889
				5890
				5891	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5892	<h4><a id="version"></a>-version</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5893	</div>
				5894
				5895	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>print ImageMagick version string and exit.</td><td style='text-align:right;'></td></tr></table>
				5896
				5897
				5898	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5899	<h4><a id="view"></a>-view <em class="arg">string</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5900	</div>
				5901
				5902	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>FlashPix viewing parameters.</td><td style='text-align:right;'></td></tr></table>
				5903
				5904
				5905	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5906	<h4><a id="vignette"></a>-vignette <em class="arg">radius</em>{x<em class="arg">sigma</em>}{<em class="arg">+-</em>}<em class="arg">x</em>{<em class="arg">+-</em>}<em class="arg">y</em>{<em class="arg">%</em>}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5907	</div>
				5908
				5909	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>soften the edges of the image in vignette style.</td><td style='text-align:right;'></td></tr></table>
				5910
				5911
				5912	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5913	<h4><a id="virtual-pixel"></a>-virtual-pixel <em class="arg">method</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5914	</div>
				5915
				5916	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Specify contents of <em>virtual pixels</em>.</td><td style='text-align:right;'></td></tr></table>
				5917
				5918	<p>This option defines what color source should be used if and when a color
				5919	lookup completely 'misses' the source image. The color(s) that appear to
				5920	surround the source image. Generally this color is derived from the source
				5921	image, but could also be set to a specify background color. </p>
				5922
				5923	<p>Choose from these methods:</p>
				5924
				5925	<pre class="text">
				5926	background: the area surrounding the image is the background color
				5927	black: the area surrounding the image is black
				5928	checker-tile: alternate squares with image and background color
				5929	dither: non-random 32x32 dithered pattern
				5930	edge: extend the edge pixel toward infinity
				5931	gray: the area surrounding the image is gray
				5932	horizontal-tile: horizontally tile the image, background color above/below
				5933	horizontal-tile-edge: horizontally tile the image and replicate the side edge pixels
				5934	mirror: mirror tile the image
				5935	random: choose a random pixel from the image
				5936	tile: tile the image (default)
				5937	transparent: the area surrounding the image is transparent blackness
				5938	vertical-tile: vertically tile the image, sides are background color
				5939	vertical-tile-edge: vertically tile the image and replicate the side edge pixels
				5940	white: the area surrounding the image is white
				5941	</pre>
				5942
				5943	<p>The default value is "edge".</p>
				5944
				5945	<p>This most important for distortion operators such as <a href="#distort"
				5946	>-distort</a>, <a href="#implode" >-implode</a>, and <a href="#fx" >-fx</a>.
				5947	However it also effects operations that may access pixels just outside the
				5948	image proper, such as <a href="#convolve">-convolve</a>, <a
				5949	href="#blur">-blur</a>, and <a href="#sharpen">-sharpen</a>. </p>
				5950
				5951	<p>To print a complete list of virtual pixel types, use the <a href="#list">-list virtual-pixel</a> option.</p>
				5952
				5953
				5954	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5955	<h4><a id="visual"></a>-visual <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5956	</div>
				5957
				5958	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Animate images using this X visual type.</td><td style='text-align:right;'>[<a href="../www/animate.html">animate</a>, <a href="../www/display.html">display</a>]</td></tr></table>
				5959
				5960	<p>Choose from these visual classes:</p>
				5961
				5962	<pre class="text">
				5963	StaticGray
				5964	GrayScale
				5965	StaticColor
				5966	PseudoColor
				5967	TrueColor
				5968	DirectColor
				5969	default
				5970	visual id
				5971	</pre>
				5972
				5973	<p>The X server must support the visual you choose, otherwise an error occurs. If a visual is not specified, the visual class that can display the most simultaneous colors on the default screen is chosen.</p>
				5974
				5975
				5976	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5977	<h4><a id="watermark"></a>-watermark <em
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5978	class="arg">brightness</em>x<em class="arg">saturation</em></h4>
				5979	</div>
				5980
				5981	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Watermark an image using the given percentages of brightness and
				5982	saturation.</td><td style='text-align:right;'>[<a href="../www/composite.html">composite</a>]</td></tr></table>
				5983
				5984	<p>Take a grayscale image (with alpha mask) and modify the destination image's
				5985	brightness according to watermark image's grayscale value and the <em
				5986	class="arg">brightness</em> percentage. The destinations color saturation
				5987	attribute is just direct modified by the <em class="arg">saturation</em>
				5988	percentage, which defaults to 100 percent (no color change). </p>
				5989
				5990
				5991	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5992	<h4><a id="wave"></a>-wave <em class="arg">amplitude</em><br />-wave <em class="arg">amplitude</em>x<em class="arg">wavelength</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5993	</div>
				5994
				5995	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Shear the columns of an image into a sine wave.</td><td style='text-align:right;'></td></tr></table>
				5996
				5997	<p>Specify <em class="arg">amplitude</em> and <em class="arg">wavelength</em> of the wave.</p>
				5998
				5999	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	6000	<h4><a id="weight"></a>-weight <em class="arg">fontWeight</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	6001	</div>
				6002
				6003	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Set a font weight for text.</td><td style='text-align:right;'></td></tr></table>
				6004
				6005	<p>This setting suggests a font weight that ImageMagick should try to apply to the currently selected font family. Use a positive integer for <em class="arg">fontWeight</em> or select from the following.</p>
				6006
				6007	<table class="doc">
				6008	<col width="25%" />
				6009	<col width="75%" />
				6010	<thead>
				6011	<tr>
				6012	<th><em class="arg">fontWeight</em></th>
				6013	<th>Description</th>
				6014	</tr>
				6015	</thead>
				6016	<tbody>
				6017	<tr><td>All </td> <td>No effect. </td></tr>
				6018	<tr><td>Bold </td> <td>Same as <em class="arg">fontWeight</em> = 700.</td></tr>
				6019	<tr><td>Bolder </td> <td>Add 100 to font weight if currently ≤ 800.</td></tr>
				6020	<tr><td>Lighter </td> <td>Subtract 100 to font weight if currently ≤ 100.</td></tr>
				6021	<tr><td>Normal </td> <td>Same as <em class="arg">fontWeight</em> = 400.</td></tr>
				6022	</tbody>
				6023	</table>
				6024
				6025	<p>To print a complete list of weight types, use <a href="#list">-list weight</a>.</p>
				6026
				6027	<p>For other settings that affect fonts, see the options <a href="#font">-font</a>, <a href="#family">-family</a>, <a href="#stretch">-stretch</a>, and <a href="#style">-style</a>. </p>
				6028
				6029	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	6030	<h4><a id="white-point"></a>-white-point <em class="arg">x,y</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	6031	</div>
				6032
				6033	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>chromaticity white point.</td><td style='text-align:right;'></td></tr></table>
				6034
				6035	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	6036	<h4><a id="white-threshold"></a>-white-threshold <em class="arg">value</em>{<em class="arg">%</em>}</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	6037	</div>
				6038
cristy	5cadd61	2009-09-21 19:33:41 +0000	[diff] [blame]	6039	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Force to white all pixels above the threshold while leaving all pixels at or below the threshold unchanged.</td><td style='text-align:right;'></td></tr></table>
				6040
				6041	<p> The threshold value can be given as a percentage or as an absolute integer value within [0, <em class="QR">QuantumRange</em>] corresponding to the desired <a href="../www/command-line-options.html#channel">‑channel</a> value. See <a href="../www/command-line-options.html#threshold">‑threshold</a> for more details on thresholds and resulting values.
				6042	</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	6043
				6044	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	6045	<h4><a id="window"></a>-window <em class="arg">id</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	6046	</div>
				6047
				6048	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>Make the image the background of a window.</td><td style='text-align:right;'>[<a href="../www/animate.html">animate</a>, <a href="../www/display.html">display</a>]</td></tr></table>
				6049
				6050	<p><em class="arg">id</em> can be a window id or name. Specify <kbd>root</kbd> to select X's root window as the target window.</p>
				6051
				6052	<p>By default the image is tiled onto the background of the target window. If <kbd>backdrop</kbd> or <a href="#geometry">-resize</a> are specified, the image is surrounded by the background color. Refer to <kbd>X RESOURCES</kbd> for details.</p>
				6053
				6054	<p>The image will not display on the root window if the image has more unique colors than the target window colormap allows. Use <a href="#colors">-colors</a> to reduce the number of colors.</p>
				6055
				6056	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	6057	<h4><a id="window-group"></a>-window-group</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	6058	</div>
				6059
				6060	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>specify the window group.</td><td style='text-align:right;'></td></tr></table>
				6061
				6062	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	6063	<h4><a id="write"></a>-write <em class="arg">filename</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	6064	</div>
				6065
				6066	<table style='background-color:#FFFFE0; margin-left:40px; margin-right:40px; width:88%'><tr><td style='width:75%'>write an image sequence.</td><td style='text-align:right;'></td></tr></table>
				6067	<p>The image sequence preceding the <a href="#write">-write</a> <em class="arg">filename</em> option is written out, and processing continues with the same image in its current state if there are additional options. To restore the image to its original state after writing it, use the <a href="#write">+write</a> <em class="arg">filename</em> option.</p>
				6068
				6069	<p>Use <a href="#compress">-compress</a> to specify the type of image compression.</p>
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	6070	</div>
				6071	</div>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	6072
				6073	</div>
				6074
				6075	<div id="linkbar">
cristy	ce69bb0	2010-07-27 19:49:46 +0000	[diff] [blame]	6076	<span id="linkbar-west"> </span>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	6077	<span id="linkbar-center">
				6078	<a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> •
cristy	a890294	2010-07-30 00:49:52 +0000	[diff] [blame]	6079	<a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	6080	</span>
				6081	<span id="linkbar-east"> </span>
				6082	</div>
				6083	<div class="footer">
cristy	7e41fe8	2010-12-04 23:12:08 +0000	[diff] [blame]	6084	<span id="footer-west">© 1999-2011 ImageMagick Studio LLC</span>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	6085	<span id="footer-east"> <a href="http://www.imagemagick.org/script/contact.php">Contact the Wizards</a></span>
				6086	</div>
				6087	<div style="clear: both; margin: 0; width: 100%; "></div>
cristy	a890294	2010-07-30 00:49:52 +0000	[diff] [blame]	6088	<script type="text/javascript">
				6089	var _gaq = _gaq \|\| [];
				6090	_gaq.push(['_setAccount', 'UA-17690367-1']);
				6091	_gaq.push(['_trackPageview']);
				6092
				6093	(function() {
				6094	var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
				6095	ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
				6096	var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
				6097	})();
				6098	</script>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	6099	</body>
				6100	</html>