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

blob: 0871e16ee6023d2dd2de9d1277e9e9ed2ba49817 [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	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	16	<meta name="Description" content="ImageMagick is a software suite to create, edit, compose, or convert bitmap images in a variety of formats. Use ImageMagick to scale, 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/">
				59	<img src="../images/logo.jpg" alt=""
				60	style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
				61	<a href="../index.html">
				62	<img src="../images/sprite.jpg" alt=""
				63	style="width: 114px; height: 118px; border: 0px; float: right;" /></a>
				64	</div>
				65
cristy	ce69bb0	2010-07-27 19:49:46 +0000	[diff] [blame]	66	<div class="westbar">
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	67
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	68	<div class="menu">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	69	<a title="About ImageMagick" href="../index.html">About ImageMagick</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	70	</div>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	71	<div class="sep"></div>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	72	<div class="menu">
cristy	bb50337	2010-05-27 20:51:26 +0000	[diff] [blame]	73	<a title="Binary Releases" href="../www/binary-releases.html">Binary Releases</a>
				74	</div>
				75	<div class="sub">
				76	<a title="Binary Release: Unix" href="../www/binary-releases.html#unix">Unix</a>
				77	</div>
				78	<div class="sub">
				79	<a title="Binary Release: MacOS X" href="../www/binary-releases.html#macosx">Mac OS X</a>
				80	</div>
				81	<div class="sub">
				82	<a title="Binary Release: Windows" href="../www/binary-releases.html#windows">Windows</a>
				83	</div>
				84	<div class="sep"></div>
				85	<div class="menu">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	86	<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]	87	</div>
				88	<div class="sub">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	89	<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]	90	</div>
				91	<div class="sub">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	92	<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]	93	</div>
				94	<div class="sub">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	95	<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]	96	</div>
				97	<div class="menu">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	98	<a title="Program Interfaces" href="../www/api.html">Program Interfaces</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	99	</div>
				100	<div class="sub">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	101	<a title="Program Interface: MagickWand" href="../www/magick-wand.html">MagickWand</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	102	</div>
				103	<div class="sub">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	104	<a title="Program Interface: MagickCore" href="../www/magick-core.html">MagickCore</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	105	</div>
				106	<div class="sub">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	107	<a title="Program Interface: PerlMagick" href="../www/perl-magick.html">PerlMagick</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	108	</div>
				109	<div class="sub">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	110	<a title="Program Interface: Magick++" href="../www/magick++.html">Magick++</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	111	</div>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	112	<div class="sep"></div>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	113	<div class="menu">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	114	<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]	115	</div>
				116	<div class="sub">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	117	<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]	118	</div>
				119	<div class="sub">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	120	<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]	121	</div>
				122	<div class="menu">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	123	<a title="Resources" href="../www/resources.html">Resources</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	124	</div>
cristy	bb50337	2010-05-27 20:51:26 +0000	[diff] [blame]	125	<div class="menu">
				126	<a title="Architecture" href="../www/architecture.html">Architecture</a>
				127	</div>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	128	<div class="menu">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	129	<a title="Download" href="../www/download.html">Download</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	130	</div>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	131	<div class="sep"></div>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	132	<div class="menu">
cristy	5292344	2011-01-15 22:54:31 +0000	[diff] [blame^]	133	<a title="Search" href="../www/search.html">Search</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	134	</div>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	135	<div class="sep"></div>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	136	<div class="menu">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	137	<a title="Site Map" href="../www/sitemap.html">Site Map</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	138	</div>
				139	<div class="sub">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	140	<a title="Site Map: Links" href="../www/links.html">Links</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	141	</div>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	142	<div class="sep"></div>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	143	<div class="menu">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	144	<a title="Sponsors" href="../www/sponsors.html">Sponsors:</a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	145
				146	<div class="sponsbox">
cristy	ec6b475	2011-01-08 03:16:23 +0000	[diff] [blame]	147	<div class="sponsor">
cristy	5292344	2011-01-15 22:54:31 +0000	[diff] [blame^]	148	<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]	149	</div>
				150	<div class="sponsor">
				151	<a title="Sponsor: Druckerei" href="http://print24.com/de/">Druckerei</a><!-- 201110010720 -->
cristy	73fd1cd	2010-09-12 19:14:25 +0000	[diff] [blame]	152	</div>
				153	<div class="sponsor">
cristy	c5baf4f	2010-08-31 15:05:33 +0000	[diff] [blame]	154	<a title="Sponsor: Image Converter" href="http://www.batchphoto.com">Image Converter</a><!-- 201103010900 Bits Coffee-->
				155	</div>
				156	<div class="sponsor">
cristy	851dbce	2010-08-06 21:40:00 +0000	[diff] [blame]	157	<a title="Sponsor: Flyer drucken" href="http://www.online-druck.biz">Flyer drucken</a><!-- 201109010900 Floeter-->
				158	</div>
cristy	ec6b475	2011-01-08 03:16:23 +0000	[diff] [blame]	159	<div class="sponsor">
cristy	7a40ba8	2011-01-08 20:31:18 +0000	[diff] [blame]	160	<a title="Sponsor: Free Catalogs" href="http://www.who-sells-it.com/">Free Catalogs</a><!-- 20120801000600 -->
cristy	ec6b475	2011-01-08 03:16:23 +0000	[diff] [blame]	161	</div>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	162	</div>
				163	</div>
cristy	ce69bb0	2010-07-27 19:49:46 +0000	[diff] [blame]	164	</div>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	165
cristy	ce69bb0	2010-07-27 19:49:46 +0000	[diff] [blame]	166	<div class="eastbar">
				167	<script type="text/javascript">
				168	<!--
				169	google_ad_client = "pub-3129977114552745";
cristy	ce69bb0	2010-07-27 19:49:46 +0000	[diff] [blame]	170	google_ad_slot = "0574824969";
				171	google_ad_width = 160;
				172	google_ad_height = 600;
				173	//-->
				174	</script>
				175	<script type="text/javascript"
				176	src="http://pagead2.googlesyndication.com/pagead/show_ads.js">
				177	</script>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	178	</div>
				179
				180	<div class="main">
				181
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	182	<h1>Create, Edit, or Compose Bitmap Images With These Command-line Options</h1>
cristy	5cadd61	2009-09-21 19:33:41 +0000	[diff] [blame]	183	<p class="navigation-index">
cristy	5063d81	2010-10-19 16:28:10 +0000	[diff] [blame]	184	[ <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#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]	185
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	186	<div class="doc-section">
				187
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	188	<p>Below is list of command-line options recognized by the ImageMagick <a
				189	href="../www/command-line-tools.html">command-line
				190	tools</a>. If you want a description of a particular option, click on the
				191	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]	192	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]	193
				194	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	195	<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]	196	</div>
				197
				198	<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]	199	<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>
				200
				201	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	202	<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]	203	</div>
				204
				205	<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>
				206
				207	<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>
				208
				209	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	210	<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]	211	</div>
				212
				213	<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>
				214
				215	<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>
				216
				217	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	218	<h4><a id="adjoin"></a>-adjoin</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	219	</div>
				220
				221	<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>
				222
				223	<p>This option is enabled by default. An attempt is made to save all
				224	images of an image sequence into the given output file.
				225	However, some formats, such as JPEG and PNG, do not support more than one
				226	image per file, and in that case ImageMagick is forced to write each image as a separate file. As
				227	such, if more than one image needs to be written, the filename given is
				228	modified by adding a <a href="#scene">-scene</a> number before the
				229	suffix, in order to make distinct names for each image. </p>
				230
				231	<p>Use <a href="#adjoin">+adjoin</a> to force each image to be written
				232	to separate files, whether or not the file format allows multiple images
				233	per file (for example, GIF, MIFF, and TIFF). </p>
				234
				235	<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>
				236
				237	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert logo: rose: -morph 15 my%02dmorph.jpg</span></p>
				238	<p>will create a sequence of 17 images named my00morph.jpg, my01morph.jpg, my02morph.jpg, ..., my16morph.jpg.
				239	</p>
				240
				241	<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]	242	multiple files if either<br />
				243	(1) the output image's file format does not allow multi-image files,<br />
				244	(2) the <a href="#adjoin">+adjoin</a> option is given, or<br />
				245	(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]	246
				247
				248	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	249	<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]	250	-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>
				251	</div>
				252
				253	<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>
				254
				255	<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>
				256
				257	<p>The matrix entries are entered as comma-separated numeric values <i>with no spaces</i>. </p>
				258
				259	<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>
				260
				261	<div class="eqn">
				262	<img alt="affine transformation" src="../images/affine.png"/>
				263	</div>
				264
				265	<p>
				266	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>
				267
				268	<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>
				269
				270	<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>
				271
				272	<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>
				273
				274	<p class="crtsnip">
				275	-affine <em class="arg">s<sub>x</sub></em>,0,0,<em class="arg">s<sub>y</sub></em>
				276	</p>
				277
				278	<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>
				279
				280	<p class="crtsnip">
				281	-affine 1,0,0,1,<em class="arg">t<sub>x</sub></em>,<em class="arg">t<sub>y</sub></em>
				282	</p>
				283
				284	<p>Rotate clockwise about the origin (the upper left-hand corner) by an angle <em>a</em> by letting
				285	<em>c</em> = cos(<em>a</em>), <em>s</em> = sin(<em>a</em>), and using the following.</p>
				286
				287	<p class="crtsnip">
				288	-affine <em>c</em>,<em>s</em>,-<em>s</em>,<em>c</em>
				289	</p>
				290
				291	<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>
				292
				293	<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>
				294
				295	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	296	<h4><a id="alpha"></a>-alpha <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	297	</div>
				298
				299	<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>
				300
				301	<p>Used to set a flag on an image indicating whether or not to use existing alpha
				302	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>
				303
				304
				305	<table class="doc">
				306	<tbody>
				307	<tr valign="top">
				308	<th align="left" style="width: 8%">type</th>
				309	<th align="left">Description</th>
				310	</tr>
				311
				312	<tr valign="top">
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	313	<td valign="top"><kbd>Activate</kbd> or <kbd>On</kbd></td>
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	314	<td valign="top">
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	315	Enable the image's transparency channel. Note normally <kbd>Set</kbd>
				316	should be used instead of this, unless you specifically need to
				317	preserve existing (but specifically turned <kbd>Off</kbd>) transparency
				318	channel. </td></tr>
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	319
				320	<tr valign="top">
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	321	<td valign="top"><kbd>Deactivate</kbd> or <kbd>Off</kbd></td>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	322	<td valign="top">
				323	Disables the image's transparency channel. Does not delete or change the
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	324	existing data, just turns off the use of that data.</td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	325
				326	<tr valign="top">
				327	<td valign="top"><kbd>Set</kbd></td>
				328	<td valign="top">
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	329	Activates the alpha/matte channel. If it was previously turned off
				330	then it also resets the channel to opaque. If the image already had
				331	the alpha channel turned on, it will have no effect.</td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	332
				333	<tr valign="top">
				334	<td valign="top"><kbd>Opaque</kbd></td>
				335	<td valign="top">
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	336	Enables the alpha/matte channel and forces it to be fully opaque.
				337	</td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	338
				339	<tr valign="top">
				340	<td valign="top"><kbd>Transparent</kbd></td>
				341	<td valign="top">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	342	Activates the alpha/matte channel and forces it to be fully
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	343	transparent. This effectively creates a fully transparent image the
				344	same size as the original and with all its original RGB data still
				345	intact, but fully transparent. </td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	346
				347	<tr valign="top">
				348	<td valign="top"><kbd>Extract</kbd></td>
				349	<td valign="top">
				350	Copies the alpha channel values into all the color channels and turns
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	351	'<kbd>Off</kbd>' the the image's transparency, so as to generate
				352	a gray-scale mask of the image's shape. The alpha channel data is left
				353	intact just deactivated. This is the inverse of '<kbd>Copy</kbd>'.
				354	</td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	355
				356	<tr valign="top">
				357	<td valign="top"><kbd>Copy</kbd></td>
				358	<td valign="top">
				359	Turns '<kbd>On</kbd>' the alpha/matte channel, then copies the
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	360	gray-scale intensity of the image, into the alpha channel, converting
				361	a gray-scale mask into a transparent shaped mask ready to be colored
				362	appropriately. The color channels are not modified. </td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	363
				364	<tr valign="top">
				365	<td valign="top"><kbd>Shape</kbd></td>
				366	<td valign="top">
				367	As per '<kbd>Copy</kbd>' but also colors the resulting shape mask with
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	368	the current background color. That is the RGB color channels is
				369	replaced, with appropriate alpha shape.
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	370	</td></tr>
				371
				372	<tr valign="top">
				373	<td valign="top"><kbd>Background</kbd></td>
				374	<td valign="top">
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	375	Set any fully-transparent pixel to the background color, while leaving
				376	it fully-transparent. This can make some image file formats, such as
				377	PNG, smaller as the RGB values of transparent pixels are more uniform,
				378	and thus can compress better.
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	379	</td></tr>
				380	</tbody>
				381	</table>
				382
				383	<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]	384	"<kbd><a href="#alpha" >-alpha</a> Off</kbd>", the <a href="#matte"
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	385	>-matte</a> operation is the same as "<kbd><a href="#alpha" >-alpha</a>
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	386	Set</kbd>" and not "<kbd><a href="#alpha" >-alpha</a> On</kbd>". </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	387
				388
				389	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	390	<h4><a id="annotate"></a>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	391	-annotate <em class="arg">degrees</em> <em class="arg">text</em><br />
				392	-annotate <em class="arg">Xdegrees</em>x<em class="arg">Ydegrees</em> <em class="arg">text</em><br />
				393	-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>
				394	</div>
				395
				396	<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>
				397
				398	<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>
				399
				400
				401	<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>
				402
				403	<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>
				404
				405	<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>
				406	<div class="eqn"><img alt="annotate transformation" src="../images/annotate.png"/></div>
				407
				408	<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>
				409
				410	<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>
				411
				412	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	413	<h4><a id="antialias"></a>-antialias</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	414	</div>
				415
				416	<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
				417	drawing fonts and lines.</td><td style='text-align:right;'></td></tr></table>
				418
				419	<p>By default, objects (e.g. text, lines, polygons, etc.) are antialiased when
				420	drawn. Use <a href="#antialias">+antialias</a> to disable the addition of
				421	antialiasing edge pixels. This will then reduce the number of colors added to
				422	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]	423	are added when drawing such objects. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	424
				425	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	426	<h4><a id="append"></a>-append</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	427	</div>
				428
				429	<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>
				430
				431	<p>This option creates a single longer image image, by joining all the current
				432	images in sequence top-to-bottom. Use <a href="#append">+append</a> to
				433	stack images left-to-right. </p>
				434
				435	<p>If they are not of the same width, narrower images are padded with the
				436	current <a href="#background">-background</a> color setting, and their
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	437	position relative to each other can be controlled by the current <a
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	438	href="#gravity">-gravity</a> setting. </p>
				439
				440
				441	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	442	<h4><a id="attenuate"></a>-attenuate <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	443	</div>
				444
				445	<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>
				446
				447
				448	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	449	<h4><a id="authenticate"></a>-authenticate <em class="arg">password</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	450	</div>
				451
				452	<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>
				453
				454	<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>
				455
				456	<p>For a different encryption method, see <a href="#encipher">-encipher</a> and <a href="#decipher">-decipher</a>. </p>
				457
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	458
				459
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	460	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	461	<h4><a id="auto-gamma"></a>-auto-gamma</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	462	</div>
				463
				464	<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>
				465
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	466	<p>This calculates the mean values of an image, then applies a calculated <a
				467	href="#gamma" >-gamma</a> adjustment so that is the mean color exists in the
				468	image it will get a have a value of 50%. </p>
				469
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	470	<p>This means that any solid 'gray' image becomes 50% gray. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	471
				472	<p>This works well for real-life images with little or no extreme dark and
				473	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]	474	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]	475	</p>
				476
				477	<p>It uses the <a href="#channel" >-channel</a> setting, (including the
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	478	'<em>sync</em>' flag for channel syncronization), to determine which color
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	479	values is used and modified. As the default <a href="#channel"
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	480	>-channel</a> setting is '<em>RGB,sync</em>', channels are modified
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	481	together by the same gamma value, preserving colors. </p>
				482
				483
				484
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	485	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	486	<h4><a id="auto-level"></a>-auto-level</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	487	</div>
				488
				489	<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>
				490
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	491	<p>This is a 'perfect' image normalization operator. It finds the exact
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	492	minimum and maximum color values in the image and then applies a <a
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	493	href="#level" >-level</a> operator to stretch the values to the full range of
				494	values. </p>
				495
cristy	8354396	2009-10-16 19:04:28 +0000	[diff] [blame]	496	<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]	497	JPEG format images, as a single 'out-rider' pixel can set a bad min/max values
				498	for the <a href="#level" >-level</a> operation. On the other hand it is the
				499	right operator to use for color stretching gradient images being used to
				500	generate Color lookup tables, distortion maps, or other 'mathematically'
				501	defined images. </p>
				502
				503	<p>The operator is very similar to the <a href="#normalize">-normalize</a>, <a
				504	href="#contrast-stretch" >-contrast-stretch</a>, and <a href="#linear-stretch"
				505	>-linear-stretch</a> operators, but without 'histogram binning' or 'clipping'
				506	problems that these operators may have. That is <a href="#auto-level"
cristy	8354396	2009-10-16 19:04:28 +0000	[diff] [blame]	507	>-auto-level</a> is the perfect or ideal version these operators. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	508
				509	<p>It uses the <a href="#channel" >-channel</a> setting, (including the
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	510	special '<em>sync</em>' flag for channel syncronization), to determine
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	511	which color values are used and modified. As the default <a
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	512	href="#channel" >+channel</a> setting is '<em>RGB,sync</em>', the
				513	'<em>sync</em>' ensures that the color channels will are modified
cristy	8354396	2009-10-16 19:04:28 +0000	[diff] [blame]	514	together by the same gamma value, preserving colors, and ignoring
				515	transparency. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	516
				517
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	518	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	519	<h4><a id="auto-orient"></a>-auto-orient</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	520	</div>
				521
				522	<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>
				523
cristy	8354396	2009-10-16 19:04:28 +0000	[diff] [blame]	524	<p>This operator reads and resets the EXIF image profile setting 'Orientation'
				525	and then performs the appropriate 90 degree rotation on the image to orient
				526	the image, for correct viewing. </p>
				527
				528	<p>This EXIF profile setting is usually set using a gravity sensor in digital
				529	camara, however photos taken directly downward or upward may not have an
				530	appropriate value. Also images that have been orientation 'corrected' without
				531	reseting this setting, may be 'corrected' again resulting in a incorrect
				532	result. If the he EXIF profile was previously stripped, the <a
				533	href="#auto-orient" >-auto-orient</a> operator will do nothing. </p>
				534
				535
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	536	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	537	<h4><a id="average"></a>-average</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	538	</div>
				539
				540	<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>
				541
				542	<p>An error results if the images are not identically sized.</p>
				543
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	544
				545	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	546	<h4><a id="backdrop"></a>-backdrop</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	547	</div>
				548
				549	<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>
				550
				551	<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>
				552
				553	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	554	<h4><a id="background"></a>-background <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	555	</div>
				556
				557	<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>
				558
				559	<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>
				560
				561	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	562	<h4><a id="bench"></a>-bench <em class="arg">iterations</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	563	</div>
				564
				565	<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>
				566
cristy	e637813	2009-10-26 20:05:17 +0000	[diff] [blame]	567	<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]	568
cristy	e637813	2009-10-26 20:05:17 +0000	[diff] [blame]	569	<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>
				570	<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]	571
				572	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	573	<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]	574	</div>
				575
				576	<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>
				577
				578	<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>
				579
				580	<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>
				581
				582	<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
				583	negative results without clipping to the color value range
				584	(0..QuantumRange).</p>
				585
				586	<p>See the discussion on HDRI implementations of ImageMagick on the page
				587	<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.
				588	</p>
				589
				590	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	591	<h4><a id="black-point-compensation"></a>-black-point-compensation</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	592	</div>
				593
				594	<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>
				595
				596	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	597	<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]	598	</div>
				599
cristy	5cadd61	2009-09-21 19:33:41 +0000	[diff] [blame]	600	<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>
				601
				602	<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.
				603	</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	604
				605
				606	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	607	<h4><a id="blend"></a>-blend <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	608	</div>
				609
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	610	<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]	611
				612	<p>Blend will average the images together ('plus') according to the
				613	percentages given and each pixels transparency. If only a single percentage
				614	value is given it sets the weight of the composite or 'source' image, while
				615	the background image is weighted by the exact opposite amount. That is a
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	616	<kbd>-blend 30%</kbd> merges 30% of the 'source' image with 70% of the
				617	'destination' image. Thus it is equivalent to <kbd>-blend 30x70%</kbd>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	618
				619
				620	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	621	<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]	622	</div>
				623
				624	<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>
				625
				626	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	627	<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]	628	</div>
				629
				630	<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>
				631
				632	<div style="margin: auto;">
				633
				634	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	635	<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]	636	</div>
				637
				638	<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>
				639
cristy	b15553d	2010-07-03 22:53:14 +0000	[diff] [blame]	640	<p>Convolve the image with a Gaussian or normal distribution using the given
				641	<em class="arg" >Sigma</em> value. The formula is:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	642
				643	<div class="eqn"><img alt="gaussian distribution" width="243px" height="42px" src="../images/gaussian-blur.png"/>
				644	</div>
				645
cristy	b15553d	2010-07-03 22:53:14 +0000	[diff] [blame]	646	<p>The <em class="arg" >Sigma</em> value is the important argument, and
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	647	determines the actual amount of blurring that will take place. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	648
cristy	b15553d	2010-07-03 22:53:14 +0000	[diff] [blame]	649	<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]	650	array which will hold the calculated Gaussian distribution. It should be an
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	651	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]	652	radius that will provide meaningful results for the Gaussian distribution.
				653	</p>
				654
				655	<p>The larger the <em class="arg" >Radius</em> the radius the slower the
				656	operation is. However too small a <em class="arg" >Radius</em>, and sever
				657	aliasing effects may result. As a guideline, <em class="arg" >Radius</em>
				658	should be at least twice the <em class="arg" >Sigma</em> value, though three
				659	times will produce a more accurite result. </p>
				660
				661	<p>This option differs from <a href="#gaussian-blur">-gaussian-blur</a> simply
				662	by taking advantage of the separability properties of the distribution. Here
				663	we apply a single-dimensional Gaussian matrix in the horizontal direction,
				664	then repeat the process in the vertical direction.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	665
				666	<p>The <a href="#virtual-pixel">-virtual-pixel</a> setting will determine how
				667	pixels which are outside the image proper are blurred into the final result.
				668	</p>
				669
				670
				671	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	672	<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]	673	</div>
				674
				675	<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>
				676
				677	<p>Each pixel in the overlaid region is replaced with an Elliptical Weighted
				678	Average (EWA) of the source image, scaled according to the grayscale
				679	mapping. </p>
				680
				681	<p>The ellipse is weighted with sigma set to the given <em class="arg"
				682	>Width</em> and <em class="arg" >Height</em>. The <em class="arg" >Height</em>
				683	defaults to the <em class="arg" >Width</em> for a normal circular Guassian
				684	weighting. The <em class="arg" >Angle</em> will rotate the ellipse from
				685	horizontal clock-wise. </p>
				686
				687	<p>The <a href="#virtual-pixel">-virtual-pixel</a> setting will determine how
				688	pixels which are outside the image proper are blurred into the final result.
				689	</p>
				690
				691
				692	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	693	<h4><a id="border"></a>-border <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	694	</div>
				695
				696	<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>
				697
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	698	<p>Set the width and height using the <em class="arg">size</em> portion of the
				699	<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
				700	ignored. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	701
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	702	<p>Set the border color by preceding with the <a
				703	href="#bordercolor">-bordercolor</a> setting.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	704
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	705	<p>The <a href="#border">-border</a> operation is affected by the current <a
				706	href="#compose">-compose</a> setting and assumes that this is using the default
				707	'<kbd>Over</kbd>' composition method. It generates a image of the appropriate
				708	size colors by the current <a href="#bordercolor">-bordercolor</a> before
				709	overlaying the original image in the center of this net image. This means that
				710	with the default compose method of '<kbd>Over</kbd>' any transparent parts may
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	711	be replaced by the current <a href="#bordercolor">-bordercolor</a> setting.</p>
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	712	<p>See also the <a href="#frame">-frame</a> option, which has more
				713	functionality.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	714
				715	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	716	<h4><a id="bordercolor"></a>-bordercolor <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	717	</div>
				718
				719	<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>
				720
				721	<p>The color is specified using the format described under the <a href="#fill">-fill</a> option.</p>
				722
				723	<p>The default border color is <kbd>#DFDFDF</kbd>, <span style="background-color: #dfdfdf;">this shade of gray</span>.</p>
				724
				725	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	726	<h4><a id="borderwidth"></a>-borderwidth <em class="arg">geometry</em> </h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	727	</div>
				728
				729	<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>
				730
				731	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	732	<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]	733	</div>
				734
				735	<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>
				736
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	737	<p>Brightness and Contrast values apply changes to the input image. They are
				738	not absolute settings. A brightness or contrast value of zero means no change.
				739	The range of values is -100 to +100 on each. Positive values increase the
				740	brightness or contrast and negative values decrease the brightness or contrast.
				741	To control only contrast, set the brightness=0. To control only brightness,
				742	set contrast=0 or just leave it off.</p>
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	743
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	744	<p>You may also use <a href="#fill">-channel</a> to control which channels to
				745	apply the brightness and/or contrast change. The default is to apply the same
				746	transformation to all channels.</p>
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	747
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	748	<p>Brightness and Contrast arguments are converted to offset and slope of a
				749	linear transform and applied
				750	using <a href="#fill">-function polynomial "slope,offset"</a>.</p>
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	751
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	752	<p>The slope varies from 0 at contrast=-100 to almost vertical at
				753	contrast=+100. For brightness=0 and contrast=-100, the result are totally
				754	midgray. For brightness=0 and contrast=+100, the result will approach but
				755	not quite reach a threshold at midgray; that is the linear transformation
				756	is a very steep vertical line at mid gray.</p>
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	757
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	758	<p>Negative slopes, i.e. negating the image, are not possible with this
				759	function. All achievable slopes are zero or positive.</p>
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	760
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	761	<p>The offset varies from -0.5 at brightness=-100 to 0 at brightness=0 to +0.5
				762	at brightness=+100. Thus, when contrast=0 and brightness=100, the result is
				763	totally white. Similarly, when contrast=0 and brightness=-100, the result is
				764	totally black.</p>
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	765
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	766	<p>As the range of values for the arguments are -100 to +100, adding the '%'
				767	symbol is no different than leaving it off.</p>
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	768
				769	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	770	<h4><a id="cache"></a>-cache <em class="arg">threshold</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	771	</div>
				772
				773	<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>
				774
				775	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	776	<h4><a id="caption"></a>-caption <em class="arg">string</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	777	</div>
				778
				779	<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>
				780
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	781	<p>This option sets the caption meta-data of an image read in after this
				782	option has been given. To modify a caption of images already in memory use
				783	"<kbd><a href="#set">-set</a> caption</kbd>". </p>
				784
				785	<p>The caption can contain special format characters listed in the <a
				786	href="../www/escape.html">Format and
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	787	Print Image Properties</a>. These attributes are expanded when the caption
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	788	is finally assigned to the individual images. </p>
				789
				790	<p>If the first character of <em class="arg">string</em> is <em
				791	class="arg">@</em>, the image caption is read from a file titled by the
				792	remaining characters in the string. Comments read in from a file are literal;
				793	no embedded formatting characters are recognized.</p>
				794
				795	<p>Caption meta-data ais not visible on the image itself. To do that use the
				796	<a href="#annotate">-annotate</a> or <a href="#draw">-draw</a> options
				797	instead.</p>
				798
				799	<p>For example,</p>
				800
				801	<p class="crtsnip">
				802	-caption "%m:%f %wx%h" bird.miff
				803	</p>
				804
				805	<p>produces an image caption of <kbd>MIFF:bird.miff 512x480</kbd> (assuming
				806	that the image <kbd>bird.miff</kbd> has a width of 512 and a height of
				807	480.</p>
				808
				809
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	810	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	811	<h4><a id="cdl"></a>-cdl <em class="arg">filename</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	812	</div>
				813
				814	<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>
				815
				816	<p>Here is an example color correction collection:</p>
				817
				818	<pre class="text">
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	819	<?xml version="1.0" encoding="UTF-8"?>
				820	<ColorCorrectionCollection xmlns="urn:ASC:CDL:v1.2">
				821	<ColorCorrection id="cc06668">
				822	<SOPNode>
				823	<Slope> 0.9 1.2 0.5 </Slope>
				824	<Offset> 0.4 -0.5 0.6 </Offset>
				825	<Power> 1.0 0.8 1.5 </Power>
				826	</SOPNode>
				827	<SATNode>
				828	<Saturation> 0.85 </Saturation>
				829	</SATNode>
				830	</ColorCorrection>
				831	</ColorCorrectionCollection>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	832	</pre>
				833
				834	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	835	<h4><a id="channel"></a>-channel <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	836	</div>
				837
				838	<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>
				839
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	840	<p>Choose from: <kbd>Red</kbd>, <kbd>Green</kbd>, <kbd>Blue</kbd>,
				841	<kbd>Alpha</kbd>, <kbd>Cyan</kbd>, <kbd>Magenta</kbd>, <kbd>Yellow</kbd>,
				842	<kbd>Black</kbd>, <kbd>Opacity</kbd>, <kbd>Index</kbd>, <kbd>RGB</kbd>,
				843	<kbd>RGBA</kbd>, <kbd>CMYK</kbd>, or <kbd>CMYKA</kbd>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	844
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	845	<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]	846	abbreviated as a concatenation of the letters '<kbd>R</kbd>', '<kbd>G</kbd>',
				847	'<kbd>B</kbd>', '<kbd>A</kbd>', '<kbd>O</kbd>', '<kbd>C</kbd>',
				848	'<kbd>M</kbd>', '<kbd>Y</kbd>', '<kbd>K</kbd>'.
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	849
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	850	For example, to only select the <kbd>Red</kbd> and <kbd>Blue</kbd> channels
				851	you can either use </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	852	<p class="crtsnip">
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	853	-channel Red,Blue
				854	</p>
				855	<p>or you can use the short hand form</p>
				856	<p class="crtsnip">
				857	-channel RB
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	858	</p>
				859
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	860	<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]	861	special channel type <kbd>All</kbd>. Not all operators are 'channel capable',
				862	but generally any operators that are generally 'grey-scale' image operators,
				863	will understand this setting. See individual operator documentation. </p>
				864
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	865	<br />
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	866
				867	<p>On top of the normal channel selection a extra flag can be specified,
				868	'<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]	869	operators that understand this flag should perform: cross-channel
				870	syncronization of the channels. If not specified, then most grey-scale
				871	operators will apply their image processing operations to each individual
				872	channel (as specified by the rest of the <a href="#channel">-channel</a>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	873	setting) completely independently from each other. </p>
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	874
				875	<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]	876	<a href="#auto-gamma">-auto-gamma</a> the color channels are modified
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	877	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]	878	it being set, then each channel is modified separately and
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	879	independently, which may produce color distortion. </p>
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	880
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	881	<p>The <a href="#morphology">-morphology</a> '<kbd>Convolve</kbd>' method
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	882	and the <a href="#compose">-compose</a> mathematical methods, also understands
				883	the '<kbd>Sync</kbd>' flag to modify the behaviour of pixel colors according
				884	to the alpha channel (if present). That is to say it will modify the image
				885	processing with the understanding that fully-transparent colors should not
				886	contribute to the final result. </p>
				887
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	888	<p>Basically, by default, operators work with color channels in syncronous, and
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	889	treats transparency as special, unless the <a href="#channel">-channel</a>
				890	setting is modified so as to remove the effect of the '<kbd>Sync</kbd>' flag.
				891	How each operator does this depends on that operators current implementation.
				892	Not all operators understands this flag at this time, but that is changing.
				893	</p>
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	894
				895	<p>To print a complete list of channel types, use <a href="#list">-list
				896	channel</a>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	897
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	898	<br />
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	899
				900	<p>By default, ImageMagick sets <a href="#channel">-channel</a> to the value
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	901	'<kbd>RGBK,sync</kbd>', which specifies that operators act on all color
				902	channels except the transparency channel, and that all the color channels are
				903	to be modified in exactly the same way, with a understanding of transprancy
				904	(depending on the operation being applied). The 'plus' form <a
				905	href="#channel" >+channel</a> will reset the value back to this default. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	906
				907	<p>Options that are affected by the <a href="#channel" >-channel</a> setting
				908	include the following.
				909
				910	<a href="#auto-gamma">-auto-gamma</a>,
				911	<a href="#auto-level">-auto-level</a>,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	912	<a href="#black-threshold">-black-threshold</a>,
				913	<a href="#blur">-blur</a>,
cristy	b4c03bb	2009-09-27 13:55:46 +0000	[diff] [blame]	914	<a href="#clamp">-clamp</a>,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	915	<a href="#clut">-clut</a>,
				916	<a href="#combine">-combine</a>,
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	917	<a href="#composite">-composite</a> (Mathematical compose methods only),
				918	<a href="#convolve">-convolve</a>,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	919	<a href="#contrast-stretch">-contrast-stretch</a>,
				920	<a href="#evaluate">-evaluate</a>,
				921	<a href="#function">-function</a>,
				922	<a href="#fx">-fx</a>,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	923	<a href="#gaussian-blur">-gaussian-blur</a>,
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	924	<a href="#hald-clut">-hald-clut</a>,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	925	<a href="#motion-blur">-motion-blur</a>,
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	926	<a href="#morphology">-morphology</a>,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	927	<a href="#negate">-negate</a>,
				928	<a href="#normalize">-normalize</a>,
				929	<a href="#ordered-dither">-ordered-dither</a>,
				930	<a href="#radial-blur">-radial-blur</a>,
				931	<a href="#random-threshold">-random-threshold</a>,
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	932	<a href="#separate">-separate</a>,
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	933	<a href="#threshold">-threshold</a>, and
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	934	<a href="#white-threshold">-white-threshold</a>.
				935	</p>
				936
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	937	<p>Warning, some operators behave differently when the <a href="#channel"
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	938	>+channel</a> default setting is in effect, verses ANY user defined <a
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	939	href="#channel" >-channel</a> setting (including the equivalent of the
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	940	default). These operators have yet to be made to understand the newer 'Sync'
				941	flag. </p>
				942
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	943	<p>For example <a href="#threshold">-threshold</a> will by default gray-scale
				944	the image before thresholding, if no <a href="#channel" >-channel</a> setting
				945	has been defined. This is not 'Sync flag controlled, yet. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	946
				947	<p>Also some operators such as <a href="#blur">-blur</a>, <a
				948	href="#gaussian-blur">-gaussian-blur</a>, will modify their handling of the
				949	color channels if the '<kbd>alpha</kbd>' channel is also enabled by <a
				950	href="#channel" >-channel</a>. Generally this done to ensure that
				951	fully-transparent colors are treated as being fully-transparent, and thus any
				952	underlying 'hidden' color has no effect on the final results. Typically
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	953	resulting in 'halo' effects. The newer <a href="#morphology">-morphology</a>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	954	convolution equivalents however does have a understanding of the 'Sync' flag
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	955	and will thus handle transparency correctly by default. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	956
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	957	<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]	958	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]	959	alpha channel present, and the <a href="#channel" >-channel</a> setting tells
				960	the operator to apply the operation using alpha channels. The <a
				961	href="#clut">-clut</a> operator is a good example of this. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	962
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	963
				964	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	965	<h4><a id="clamp"></a>-clamp</h4>
cristy	b4c03bb	2009-09-27 13:55:46 +0000	[diff] [blame]	966	</div>
				967
				968	<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>
				969
				970	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	971	<h4><a id="charcoal"></a>-charcoal <em class="arg">factor</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	972	</div>
				973
				974	<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>
				975
				976	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	977	<h4><a id="chop"></a>-chop <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	978	</div>
				979
				980	<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>
				981
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	982	<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>
				983	and <em class="arg">height</em> given in the of the <em class="arg">size</em>
				984	portion of the <em class="arg">geometry</em> argument give the number of
				985	columns and rows to remove. The <em class="arg">offset</em> portion of
				986	the <em class="arg">geometry</em> argument is influenced by
				987	a <a href="#gravity">-gravity</a> setting, if present.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	988
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	989	<p>The <a href="#chop">-chop</a> option removes entire rows and columns,
				990	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]	991
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	992	<p>While it can remove internal rows and columns of pixels, it is more typically
				993	used with as <a href="#gravity">-gravity</a> setting and a '<kbd>+0+0</kbd>' offset
				994	so as to remove a single edge from an image. Compare this to <a href="#shave"
				995	>-shave</a> whcih removes equal numbers of pixels from oppisite sides of the image.
				996	</p>
				997
				998	<p>Using <a href="#chop">-chop</a> will effectivally undo the results of a
				999	<a href="#splice">-splice</a> that was given the same <em class="arg">geometry</em>
				1000	and <a href="#gravity">-gravity</a> settings. </p>
				1001
				1002
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1003	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1004	<h4><a id="clip"></a>-clip</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1005	</div>
				1006
				1007	<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>
				1008
				1009	<p>If a clipping path is present, it is applied to subsequent operations.</p>
				1010
				1011	<p>For example, in the command</p>
				1012
				1013	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert -clip -negate cockatoo.tif negated.tif</span></p>
				1014	<p>only the pixels within the clipping path are negated.</p>
				1015
				1016	<p>The <a href="#clip">-clip</a> feature requires the XML library. If the XML library is not present, the option is ignored.</p>
				1017
				1018	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1019	<h4><a id="clip-mask"></a>-clip-mask</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1020	</div>
				1021
				1022	<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>
				1023
				1024	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1025	<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]	1026	</div>
				1027
				1028	<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>
				1029
				1030	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1031	<h4><a id="clone"></a>-clone <em class="arg">index(s)</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1032	</div>
				1033
				1034	<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>
				1035
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1036	<p>Inside parenthesis (where the operator is normally used) it will make a
				1037	clone of the images from the last 'pushed' image sequence, and adds them to
				1038	the end of the current image sequence. Outside parenthesis
				1039	(not recommended) it clones the images from the current image sequence. </p>
				1040
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1041	<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]	1042	0. Negative indexes are relative to the end of the sequence; for
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1043	example, <kbd>−1</kbd>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1044	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]	1045	dash (e.g. <kbd>0−4</kbd>). Separate multiple indexes with commas but no
				1046	spaces (e.g. <kbd>0,2,5</kbd>). A value of '<kbd>0−−1</kbd> will
				1047	effectivally clone all the images. </p>
				1048
				1049	<p>The <a href="#clone">+clone</a> will simply make a copy of the last image
				1050	in the image sequence, and is thus equivelent to using a argument of
				1051	'<kbd>−1</kbd>'. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1052
				1053	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1054	<h4><a id="clut"></a>-clut</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1055	</div>
				1056
				1057	<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
				1058	corresponding channel in the second image as a <b>c</b>olor
				1059	<b>l</b>ook<b>u</b>p <b>t</b>able.</td><td style='text-align:right;'></td></tr></table>
				1060
				1061	<p>The second (LUT) image is ordinarily a gradient image containing the
				1062	histogram mapping of how each channel should be modified. Typically it is a
				1063	either a single row or column image of replacement color values. If larger
				1064	than a single row or column, values are taken from a diagonal line from
				1065	top-left to bottom-right corners.</p>
				1066
				1067	<p>The lookup is further controlled by the <a
				1068	href="#interpolate">-interpolate</a> setting, which is especially handy for an
				1069	LUT which is not the full length needed by the ImageMagick installed Quality
				1070	(Q) level. Good settings for this are the '<kbd>bilinear</kbd>' and
				1071	'<kbd>bicubic</kbd>' interpolation settings, which give smooth color
				1072	gradients, and the '<kbd>integer</kbd>' setting for a direct, unsmoothed
				1073	lookup of color values. </p>
				1074
				1075	<p>This operator is especially suited to replacing a grayscale image with a
				1076	specific color gradient from the CLUT image. </p>
				1077
				1078	<p>Only the channel values defined by the <a href="#channel">-channel</a>
				1079	setting will have their values replaced. In particular, since the default <a
				1080	href="#channel">-channel</a> setting is <kbd>RGB</kbd>, this means that
				1081	transparency (alpha/matte channel) is not affected, unless the <a
				1082	href="#channel">-channel</a> setting is modified. When the alpha channel is
				1083	set, it is treated by the <a href="#clut" >-clut</a> operator in the same way
				1084	as the other channels, implying that alpha/matte values are replaced using the
				1085	alpha/matte values of the original image. </p>
				1086
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1087	<p>If either the image being modified, or the lookup image, contains no
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1088	transparency (i.e. <a href="#alpha" >-alpha</a> is turned 'off') but the <a
				1089	href="#channel">-channel</a> setting includes alpha replacement, then it is
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1090	assumed that image represents a gray-scale gradient which is used for the
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1091	replacement alpha values. That is you can use a gray-scale CLUT image to
				1092	adjust a existing images alpha channel, or you can color a gray-scale image
				1093	using colors form CLUT containing the desired colors, including transparency.
				1094	</p>
				1095
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1096	<p>See also <a href="#hald-clut" >-hald-clut</a> which replaces colors
				1097	according to the lookup of the full color RGB value from a 2D representation
				1098	of a 3D color cube. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1099
				1100
				1101	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1102	<h4><a id="coalesce"></a>-coalesce</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1103	</div>
				1104
				1105	<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>
				1106
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1107	<p>Overlay each image in an image sequence according to
				1108	its <a href="#dispose">-dispose</a> meta-data, to reproduce the look of
				1109	an animation at each point in the animation sequence. All images should be
				1110	the same size, and are assigned appropriate GIF disposal settings for the
				1111	animation to continue working as expected as a GIF animation. Such frames
				1112	are more easily viewed and processed than the highly optimized GIF overlay
				1113	images. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1114
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1115	<p>The animation can be re-optimized after processing using
				1116	the <a href="#layers">-layers</a> method '<kbd>optimize</kbd>', although
				1117	there is no guarantee that the restored GIF animation optimization is
				1118	better than the original. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1119
				1120
				1121	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1122	<h4><a id="colorize"></a>-colorize <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1123	</div>
				1124
				1125	<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>
				1126
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1127	<p>Specify the amount of colorization as a percentage. Separate colorization
				1128	values can be applied to the red, green, and blue channels of the image with
				1129	a comma-delimited list of colorization
				1130	values (e.g., <kbd>-colorize 0,0,50</kbd>).</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1131
				1132	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1133	<h4><a id="colormap"></a>-colormap <em class="arg">type</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%'>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>
				1137
				1138	<p>The <em class="arg">type</em> can be <kbd>shared</kbd> or <kbd>private</kbd>.</p>
				1139
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1140	<p>This option only applies when the default X server visual
				1141	is <kbd>PseudoColor</kbd> or <kbd>GrayScale</kbd>. Refer
				1142	to <a href="#visual">-visual</a> for more details. By default,
				1143	a shared colormap is allocated. The image shares colors with
				1144	other X clients. Some image colors could be approximated,
				1145	therefore your image may look very different than intended.
				1146	If <kbd>private</kbd> is chosen, the image colors appear exactly
				1147	as they are defined. However, other clients may go <em>technicolor</em>
				1148	when the image colormap is installed.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1149
				1150	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1151	<h4><a id="colors"></a>-colors <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1152	</div>
				1153
				1154	<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>
				1155
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1156	<p>The actual number of colors in the image may be less than your request,
				1157	but never more. Note that this a color reduction option. Images with fewer
				1158	unique colors than specified by <em class="arg">value</em> will have any
				1159	duplicate or unused colors removed. The ordering of an existing color
				1160	palette may be altered. When converting an image from color to grayscale,
				1161	it is more efficient to convert the image to the gray colorspace before
				1162	reducing the number of colors. Refer to
				1163	the <a href="../www/quantize.html">
				1164	color reduction algorithm</a> for more details.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1165
				1166	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1167	<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]	1168	</div>
				1169
				1170	<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>
				1171
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1172	<p>This option permits saturation changes, hue rotation, luminance to alpha,
				1173	and various other effects. Although variable-sized transformation matrices
				1174	can be used, typically one uses a 5x5 matrix for an RGBA image and a 6x6
				1175	for CMYKA (or RGBA with offsets). The matrix is similar to those used by
				1176	Adobe Flash except offsets are in column 6 rather than 5 (in support of
				1177	CMYKA images) and offsets are normalized (divide Flash offset by 255).</p>
cristy	2c83960	2010-04-03 02:32:08 +0000	[diff] [blame]	1178
				1179	<p>As an example, to add contrast to an image with offsets, try this command:</p>
				1180
				1181	<pre class="text">
				1182	convert kittens.jpg -color-matrix \
				1183	" 1.5 0.0 0.0 0.0, 0.0, -0.157 \
				1184	0.0 1.5 0.0 0.0, 0.0, -0.157 \
				1185	0.0 0.0 1.5 0.0, 0.0, -0.157 \
				1186	0.0 0.0 0.0 1.0, 0.0, 0.0 \
				1187	0.0 0.0 0.0 0.0, 1.0, 0.0 \
				1188	0.0 0.0 0.0 0.0, 0.0, 1.0" kittens.png
				1189	</pre>
				1190	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1191	<h4><a id="colorspace"></a>-colorspace <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1192	</div>
				1193
				1194	<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>
				1195
				1196	<p>Choices are:</p>
				1197
				1198	<pre class="text">
				1199	CMY
				1200	CMYK
				1201	Gray
				1202	HSB
				1203	HSL
				1204	HWB
				1205	Lab
				1206	Log
				1207	OHTA
				1208	Rec601Luma
				1209	Rec601YCbCr
				1210	Rec709Luma
				1211	Rec709YCbCr
				1212	RGB
				1213	sRGB
				1214	Transparent
				1215	XYZ
				1216	YCbCr
				1217	YCC
				1218	YIQ
				1219	YPbPr
				1220	YUV
				1221	</pre>
				1222
				1223	<p>To print a complete list of colorspaces, use <a href="#list">-list colorspace</a>.</p>
				1224
				1225	<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>
				1226
				1227	<table class="doc">
				1228	<caption>Conversion Of RGB To Other Color Spaces</caption>
				1229	<tr><th align="left" valign="middle">CMY</th></tr>
				1230	<tr><td align="left" valign="middle">C=<em class="QR">QuantumRange</em>−R</td></tr>
				1231	<tr><td align="left" valign="middle">M=<em class="QR">QuantumRange</em>−G</td></tr>
				1232	<tr><td align="left" valign="middle">Y=<em class="QR">QuantumRange</em>−B</td></tr>
				1233	<tr><th align="left" valign="middle">CMYK — starts with CMY from above</th></tr>
				1234	<tr><td align="left" valign="middle">K=min(C,Y,M)</td></tr>
				1235	<tr><td align="left" valign="middle">C=<em class="QR">QuantumRange</em>*(C−K)/(<em class="QR">QuantumRange</em>−K)</td></tr>
				1236	<tr><td align="left" valign="middle">M=<em class="QR">QuantumRange</em>*(M−K)/(<em class="QR">QuantumRange</em>−K)</td></tr>
				1237	<tr><td align="left" valign="middle">Y=<em class="QR">QuantumRange</em>*(Y−K)/(<em class="QR">QuantumRange</em>−K)</td></tr>
				1238
				1239	<tr><th align="left" valign="middle">Gray</th></tr>
				1240	<tr><td align="left" valign="middle">Gray = 0.29900R+0.58700G+0.11400*B</td></tr>
				1241
				1242	<tr><th align="left" valign="middle">HSB — Hue, Saturation, Brightness; like a cone peak downward</th></tr>
				1243	<tr><td align="left" valign="middle">H=angle around perimeter (0 to 360 deg); H=0 is red; increasing angles toward green</td></tr>
				1244	<tr><td align="left" valign="middle">S=distance from axis outward</td></tr>
				1245	<tr><td align="left" valign="middle">B=distance along axis from bottom upward; B=max(R,G,B); <em>intensity-like</em></td></tr>
				1246
				1247	<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>
				1248	<tr><td align="left" valign="middle">H=angle around perimeter (0 to 360 deg); H=0 is red; increasing angles toward green</td></tr>
				1249	<tr><td align="left" valign="middle">S=distance from axis outward</td></tr>
				1250	<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>
				1251
				1252	<tr><th align="left" valign="middle">HWB — Hue, Whiteness, Blackness</th></tr>
				1253	<tr><td align="left" valign="middle">Hue (complicated equation)</td></tr>
				1254	<tr><td align="left" valign="middle">Whiteness (complicated equation)</td></tr>
				1255	<tr><td align="left" valign="middle">Blackness (complicated equation)</td></tr>
				1256
				1257	<tr><th align="left" valign="middle">LAB</th></tr>
				1258	<tr><td align="left" valign="middle">L (complicated equation relating X,Y,Z)</td></tr>
				1259	<tr><td align="left" valign="middle">A (complicated equation relating X,Y,Z)</td></tr>
				1260	<tr><td align="left" valign="middle">B (complicated equation relating X,Y,Z)</td></tr>
				1261
				1262	<tr><th align="left" valign="middle">LOG</th></tr>
				1263	<tr><td align="left" valign="middle">I1 (complicated equation involving logarithm of R)</td></tr>
				1264	<tr><td align="left" valign="middle">I2 (complicated equation involving logarithm of G)</td></tr>
				1265	<tr><td align="left" valign="middle">I3 (complicated equation involving logarithm of B)</td></tr>
				1266
				1267	<tr><th align="left" valign="middle">OHTA — approximates principal components transformation</th></tr>
				1268	<tr><td align="left" valign="middle">I1=0.33333R+0.33334G+0.33333*B; <em>intensity-like</em></td></tr>
				1269	<tr><td align="left" valign="middle">I2=(0.50000R+0.00000G−0.50000B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1270	<tr><td align="left" valign="middle">I3=(−0.25000R+0.50000G−0.25000B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1271
				1272	<tr><th align="left" valign="middle">Rec601Luma</th></tr>
				1273	<tr><td align="left" valign="middle">Gray = 0.29900R+0.58700G+0.11400*B</td></tr>
				1274
				1275	<tr><th align="left" valign="middle">Rec601YCbCr</th></tr>
				1276	<tr><td align="left" valign="middle">Y=0.299000R+0.587000G+0.114000*B; <em>intensity-like</em></td></tr>
				1277	<tr><td align="left" valign="middle">Cb=(−0.168736R-0.331264G+0.500000B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1278	<tr><td align="left" valign="middle">Cr=(0.500000R−0.418688G−0.081312B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1279
				1280	<tr><th align="left" valign="middle">Rec709Luma</th></tr>
				1281	<tr><td align="left" valign="middle">Gray=0.21260R+0.71520G+0.07220*B</td></tr>
				1282
				1283	<tr><th align="left" valign="middle">Rec709YCbCr</th></tr>
				1284	<tr><td align="left" valign="middle">Y=0.212600R+0.715200G+0.072200*B; <em>intensity-like</em></td></tr>
				1285	<tr><td align="left" valign="middle">Cb=(−0.114572R−0.385428G+0.500000B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1286	<tr><td align="left" valign="middle">Cr=(0.500000R−0.454153G−0.045847B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1287
				1288	<tr><th align="left" valign="middle">sRGB</th></tr>
				1289	<tr><td align="left" valign="middle">if Rs ≤ .03928 then Rs=R/12.92 else Rs=((R+.055)/1.055)^2.4</td></tr>
				1290	<tr><td align="left" valign="middle">if Gs ≤ .03928 then Gs=B/12.92 else Gs=((G+.055)/1.055)^2.4</td></tr>
				1291	<tr><td align="left" valign="middle">if Bs ≤ .03928 then Bs=B/12.92 else Bs=((B+.055)/1.055)^2.4</td></tr>
				1292
				1293	<tr><th align="left" valign="middle">XYZ</th></tr>
				1294	<tr><td align="left" valign="middle">X=0.4124240R+0.3575790G+0.1804640*B</td></tr>
				1295	<tr><td align="left" valign="middle">Y=0.2126560R+0.7151580G+0.0721856*B</td></tr>
				1296	<tr><td align="left" valign="middle">Z=0.0193324R+0.1191930G+0.9504440*B</td></tr>
				1297
				1298	<tr><th align="left" valign="middle">YCC</th></tr>
				1299	<tr><td align="left" valign="middle">Y=(0.29900R+0.58700G+0.11400*B) (with complicated scaling); <em>intensity-like</em></td></tr>
				1300	<tr><td align="left" valign="middle">C1=(−0.29900R−0.58700G+0.88600*B) (with complicated scaling)</td></tr>
				1301	<tr><td align="left" valign="middle">C2=(0.70100R−0.58700G−0.11400*B) (with complicated scaling)</td></tr>
				1302
				1303	<tr><th align="left" valign="middle">YCbCr</th></tr>
				1304	<tr><td align="left" valign="middle">Y=0.299000R+0.587000G+0.114000*B; <em>intensity-like</em></td></tr>
				1305	<tr><td align="left" valign="middle">Cb=(−0.168736R−0.331264G+0.500000B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1306	<tr><td align="left" valign="middle">Cr=(0.500000R−0.418688G−0.081312B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1307
				1308	<tr><th align="left" valign="middle">YIQ</th></tr>
				1309	<tr><td align="left" valign="middle">Y=0.29900R+0.58700G+0.11400*B; <em>intensity-like</em></td></tr>
				1310	<tr><td align="left" valign="middle">I=(0.59600R−0.27400G−0.32200B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1311	<tr><td align="left" valign="middle">Q=(0.21100R−0.52300G+0.31200B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1312
				1313	<tr><th align="left" valign="middle">YPbPr</th></tr>
				1314	<tr><td align="left" valign="middle">Y=0.299000R+0.587000G+0.114000*B; <em>intensity-like</em></td></tr>
				1315	<tr><td align="left" valign="middle">Pb=(−0.168736R−0.331264G+0.500000B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1316	<tr><td align="left" valign="middle">Pr=(0.500000R−0.418688G−0.081312B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1317
				1318	<tr><th align="left" valign="middle">YUV</th></tr>
				1319	<tr><td align="left" valign="middle">Y=0.29900R+0.58700G+0.11400*B; <em>intensity-like</em></td></tr>
				1320	<tr><td align="left" valign="middle">U=(−0.14740R−0.28950G+0.43690B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1321	<tr><td align="left" valign="middle">V=(0.61500R−0.51500G−0.10000B)(<em class="QR">QuantumRange</em>+1)/2</td></tr>
				1322	</table>
				1323
				1324	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1325	<h4><a id="combine"></a>-combine</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1326	</div>
				1327
				1328	<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>
				1329
				1330	<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>
				1331
				1332	<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.
				1333	</p>
				1334
cristy	4949d52	2010-03-12 18:41:34 +0000	[diff] [blame]	1335	<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]	1336	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1337	<h4><a id="comment"></a>-comment <em class="arg">string</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1338	</div>
				1339
				1340	<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>
				1341
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1342	<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]	1343	option has been given. To modify a comment of images already in memory use
				1344	"<kbd><a href="#set">-set</a> comment</kbd>". </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1345
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	1346	<p>The comment can contain special format characters listed in the <a
				1347	href="../www/escape.html">Format and
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1348	Print Image Properties</a>. These attributes are expanded when the comment
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	1349	is finally assigned to the individual images. </p>
				1350
				1351	<p>If the first character of <em class="arg">string</em> is <em
				1352	class="arg">@</em>, the image comment is read from a file titled by the
				1353	remaining characters in the string. Comments read in from a file are literal;
				1354	no embedded formatting characters are recognized.</p>
				1355
				1356	<p>Comment meta-data are not visible on the image itself. To do that use the
				1357	<a href="#annotate">-annotate</a> or <a href="#draw">-draw</a> options
				1358	instead.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1359
				1360	<p>For example,</p>
				1361
				1362	<p class="crtsnip">
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	1363	-comment "%m:%f %wx%h" bird.miff
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1364	</p>
				1365
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	1366	<p>produces an image comment of <kbd>MIFF:bird.miff 512x480</kbd> (assuming
				1367	that the image <kbd>bird.miff</kbd> has a width of 512 and a height of
				1368	480.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1369
				1370	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1371	<h4><a id="compose"></a>-compose <em class="arg">operator</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1372	</div>
				1373
				1374	<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>
				1375
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	1376	<p>See <a href="../www/compose.html">Alpha Compositing</a> for
				1377	a detailed discussion of alpha compositing.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1378
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	1379	<p>This setting effects image processing operators that merge two (or more)
				1380	images together in some way. This includes the operators,
				1381	<a href="#composite">-composite</a>,
				1382	<a href="#layers">-layers</a> composite,
				1383	<a href="#flatten">-flatten</a>,
				1384	<a href="#mosaic">-mosaic</a>,
				1385	<a href="#layers">-layers</a> merge,
				1386	<a href="#border">-border</a>,
				1387	<a href="#frame">-frame</a>,
				1388	and <a href="#extent">-extent</a>. </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>It is also one of the primary options for the "<kbd>composite</kbd>"
				1391	command. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1392
				1393
				1394	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1395	<h4><a id="composite"></a>-composite</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1396	</div>
				1397
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	1398	<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]	1399
				1400	<p>Take the first image 'destination' and overlay the second 'source' image
				1401	according to the current <a href="#compose">-compose</a> setting. The location
				1402	of the 'source' or 'overlay' image is controlled according to <a
				1403	href="#geometry" >-geometry</a>, and <a href="#geometry" >-geometry</a>
				1404	settings. </p>
				1405
				1406	<p>If a third image is given this is treated as a gray-scale 'mask' image
				1407	relative to the first 'destination' image. This mask will limit what parts of
				1408	the destination can be modified by the image composition. However for the
				1409	'<kbd>displace</kbd>' compose method, the mask is used to provide a separate
				1410	Y-displacement image instead. </p>
				1411
				1412	<p>If a <a href="#compose">-compose</a> method requires extra numerical
				1413	arguments or flags these can be provided by setting the <a
				1414	href="#set">-set</a> '<kbd class="arg">option:compose:args</kbd>'
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1415	appropriately for the compose method. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1416
				1417	<p>Some <a href="#compose">-compose</a> methods can modify the 'destination'
				1418	image outside the overlay area. You can disable this by setting the special <a
				1419	href="#set">-set</a> '<kbd class="arg">option:compose:outside-overlay</kbd>'
				1420	to '<kbd>false</kbd>'. </p>
				1421
				1422
				1423	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1424	<h4><a id="compress"></a>-compress <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1425	</div>
				1426
				1427	<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>
				1428
				1429	<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>
				1430
				1431	<p>To print a complete list of compression types, use <a href="#list">-list compress</a>.</p>
				1432
				1433	<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>
				1434
				1435	<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>
				1436
				1437	<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>
				1438
				1439	<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>
				1440
				1441	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1442	<h4><a id="contrast"></a>-contrast</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1443	</div>
				1444
				1445	<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>
				1446
				1447	<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>
				1448
				1449	<p>For a more pronounced effect you can repeat the option:</p>
				1450
				1451	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert rose: -contrast -contrast rose_c2.png</span></p>
				1452	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1453	<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]	1454	</div>
				1455
				1456	<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>
				1457
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1458	<p>While performing the stretch, black-out at most <em
				1459	class="arg" >black-point</em> pixels and white-out at most <em
				1460	class="arg" >white-point</em> pixels. Or, if percent is used, black-out at most
				1461	<em class="arg" >black-point %</em> pixels and white-out at most <em
				1462	class="arg" >white-point %</em> pixels.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1463
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1464	<p>Prior to ImageMagick 6.4.7-0, <a href="#contrast-stretch"
				1465	>-contrast-stretch</a> will black-out at most <em class="arg"
				1466	>black-point</em> pixels and white-out at most <em class="arg" >total pixels
				1467	minus white-point</em> pixels. Or, if percent is used, black-out at most <em
				1468	class="arg">black-point %</em> pixels and white-out at most <em class="arg"
				1469	>100% minus white-point %</em> pixels.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1470
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1471	<p>Note that <kbd>-contrast-stretch 0</kbd> will modify the image such that
				1472	the image's min and max values are stretched to 0 and <em class="QR"
				1473	>QuantumRange</em>, respectively, without any loss of data due to burn-out or
				1474	clipping at either end. This is not the same as <a href="#normalize"
cristy	d4d64ed	2010-08-22 22:19:33 +0000	[diff] [blame]	1475	>-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]	1476	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]	1477
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1478	<p>Internally operator works by creating a histogram bin, and then uses that
				1479	bin to modify the image. As such some colors may be merged together when they
				1480	originally fell into the same 'bin'. </p>
				1481
				1482	<p>All the channels are normalized in concert by the came amount so as to
				1483	preserve color integrity, when the default <a href="#channel" >+channel</a>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1484	setting is in use. Specifying any other <a href="#channel" >-channel</a>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1485	setting will normalize the RGB channels independently.</p>
				1486
				1487	<p>See also <a href="#auto-level" >-auto-level</a> for a 'perfect'
				1488	normalization of mathematical images. </p>
				1489
				1490	<p>This operator is under review for re-development. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1491
				1492
				1493	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1494	<h4><a id="convolve"></a>-convolve <em class="arg">kernel</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1495	</div>
				1496
				1497	<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>
				1498
cristy	16ff93c	2010-01-13 23:18:07 +0000	[diff] [blame]	1499	<p>The <em class="arg">kernel</em> is a matrix specified as
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1500	a comma-separated list of integers (with no spaces), ordered left-to right,
				1501	starting with the top row. Presently, only odd-dimensioned kernels are
				1502	supported, and therefore the number of entries in the specified <em
				1503	class="arg">kernel</em> must be 3<sup>2</sup>=9, 5<sup>2</sup>=25,
				1504	7<sup>2</sup>=49, etc. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1505
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1506	<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
				1507	positive and negative results are relative to a user-specified bias value.
				1508	This is important for non-HDRI compilations of ImageMagick when dealing with
				1509	convolutions that contain negative as well as positive values. This is
				1510	especially the case with convolutions involving high pass filters or edge
				1511	detection. Without an output bias, the negative values is clipped at zero.
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1512	</p>
				1513
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	1514	<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
				1515	negative results without clipping to the color value range (0..QuantumRange).
				1516	See the discussion on HDRI implementations of ImageMagick on the page <a
				1517	href="/www/high-dynamic-range.html">High
				1518	Dynamic-Range Images</a>. For more about HDRI go the ImageMagick <a
				1519	href="http://www.imagemagick.org/Usage/basics/#hdri">Usage</a> pages or this
				1520	<a href="http://en.wikipedia.org/wiki/High_dynamic_range_imaging">Wikipedia</a>
				1521	entry. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1522
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1523
				1524	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1525	<h4><a id="crop"></a>-crop <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1526	</div>
				1527
				1528	<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>
				1529
				1530	<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>
				1531
				1532	<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>
				1533
				1534	<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>
				1535
				1536	<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>
				1537
				1538	<p>By adding a exclamation character flag to the geometry argument, the
				1539	cropped images virtual canvas page size and offset is set as if the
				1540	geometry argument was a viewport or window. This means the canvas page size
				1541	is set to exactly the same size you specified, the image offset set
				1542	relative top left corner of the region cropped. </p>
				1543
				1544	<p>If the cropped image 'missed' the actual image on its virtual canvas, a
				1545	special single pixel transparent 'missed' image is returned, and a 'crop
				1546	missed' warning given. </p>
				1547
cristy	739df91	2009-10-24 16:10:18 +0000	[diff] [blame]	1548	<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]	1549
				1550	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1551	<h4><a id="cycle"></a>-cycle <em class="arg">amount</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1552	</div>
				1553
				1554	<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>
				1555
				1556	<p><em class="arg">Amount</em> defines the number of positions each
				1557	colormap entry is shifted.</p>
				1558
				1559
				1560	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1561	<h4><a id="debug"></a>-debug <em class="arg">events</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1562	</div>
				1563
				1564	<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>
				1565
				1566	<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>
				1567
				1568
				1569	<p>For example, to log cache and blob events, use.</p>
				1570
				1571	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert -debug "Cache,Blob" rose: rose.png</span></p>
				1572	<p>The <kbd>User</kbd> domain is normally empty, but developers can log user events in their private copy of ImageMagick.</p>
				1573
				1574	<p>To print the complete list of debug methods, use <a href="#list">-list debug</a>.</p>
				1575
				1576	<p>Use the <a href="#log">-log</a> option to specify the format for debugging output.</p>
				1577
				1578	<p>Use <a href="#debug">+debug</a> to turn off all logging.</p>
				1579
				1580	<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>
				1581
				1582
				1583	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1584	<h4><a id="decipher"></a>-decipher <em class="arg">filename</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1585	</div>
				1586
				1587	<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>
				1588
				1589	<p>Get the passphrase from the file specified by <em class="arg">filename</em>.</p>
				1590
				1591	<p>For more information, see the webpage, <a href="http://www.imagemagick.org/www/cipher.html">ImageMagick: Encipher or Decipher an Image</a>.</p>
				1592
				1593
				1594	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1595	<h4><a id="deconstruct"></a>-deconstruct</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%'>find areas that has changed between images </td><td style='text-align:right;'></td></tr></table>
				1599
				1600	<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>
				1601
				1602	<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>
				1603
				1604	<p>This option is actually equivalent to the <a href="#layers">-layers</a> method '<kbd>compare-any</kbd>'. </p>
				1605
				1606
				1607	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1608	<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]	1609	</div>
				1610
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1611	<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]	1612	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]	1613
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1614	<p>This option creates one or more definitions for coders and decoders to use
				1615	while reading and writing image data. Definitions are generally used to
				1616	control image file format coder modules, and image processing operations,
				1617	beyond what is provided by normal means. Defined settings are listed in <a
				1618	href="#verbose" >-verbose</a> information ("<kbd>info:</kbd>" output format)
				1619	as "Artifacts". </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1620
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1621	<p>If <em class="arg">value</em> is missing for a definition, an empty-valued
				1622	definition of a flag is created with that name. This used to control on/off
				1623	options. Use <a href="#define">+define key</a> to remove definitions
				1624	previously created. Use <a href="#define">+define "*"</a> to remove all
				1625	existing definitions.</p>
				1626
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1627	<p>The same 'artifact' settings can also be defined using the <a
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1628	href="#set" >-set "option:<em class="arg">key</em>" "<em class="arg"
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1629	>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]	1630	Properties</a> in the defined value. </p>
				1631
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1632	<p>The <em>option</em> and <em>key</em> are case-independent (they are
				1633	converted to lowercase for use within the decoders) while the <em>value</em>
				1634	is case-dependent.</p>
				1635
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1636	<p>Such settings are global in scope, and effect all images and operations. </p>
				1637
				1638	<p>The following definitions are just some of the artifacts that are
				1639	available:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1640
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1641	<dl>
cristy	045bd90	2010-01-30 18:56:24 +0000	[diff] [blame]	1642	<dt>dcm:display-range=reset</dt>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1643	<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]	1644	DCM image format.</dd>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1645
cristy	045bd90	2010-01-30 18:56:24 +0000	[diff] [blame]	1646	<dt>dot:layout-engine=<em class="arg">value</em></dt>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1647	<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]	1648	<kbd>neato</kbd>).</dd>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1649
cristy	045bd90	2010-01-30 18:56:24 +0000	[diff] [blame]	1650	<dt>jpeg:extent=<em class="arg">value</em></dt>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1651	<dd>Restrict the maximum JPEG file size, for example <kbd>-define
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1652	jpeg:extent=400kb</kbd>.</dd>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1653
cristy	045bd90	2010-01-30 18:56:24 +0000	[diff] [blame]	1654	<dt>jpeg:size=<em class="arg">geometry</em></dt>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1655	<dd>Set the size hint of a JPEG image, for example, -define jpeg:size=128x128.
				1656	It is most useful for increasing performance and reducing the memory
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1657	requirements when reducing the size of a large JPEG image.</dd>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1658
cristy	045bd90	2010-01-30 18:56:24 +0000	[diff] [blame]	1659	<dt>jp2:rate=<em class="arg">value</em></dt>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1660	<dd>Specify the compression factor to use while writing JPEG-2000 files. The
				1661	compression factor is the reciprocal of the compression ratio. The valid
				1662	range is 0.0 to 1.0, with 1.0 indicating lossless compression. If defined,
				1663	this value overrides the -quality setting. A quality setting of 75
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1664	results in a rate value of 0.06641.</dd>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1665
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1666	<dt>mng:need-cacheoff</dt>
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1667	<dd>turn playback caching off for streaming MNG.</dd>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1668
cristy	045bd90	2010-01-30 18:56:24 +0000	[diff] [blame]	1669	<dt>png:bit-depth=<em class="arg">value</em></dt>
				1670	<dt>png:color-type=<em class="arg">value</em></dt>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1671	<dd>desired bit-depth and color-type for PNG output. You can force the PNG
				1672	encoder to use a different bit-depth and color-type than it would have
				1673	normally selected, but only if this does not cause any loss of image
				1674	quality. Any attempt to reduce image quality is treated as an error and no
				1675	PNG file is written. E.g., if you have a 1-bit black-and-white image, you
				1676	can use these "defines" to cause it to be written as an 8-bit grayscale,
				1677	indexed, or even a 64-bit RGBA. But if you have a 16-million color image,
				1678	you cannot force it to be written as a grayscale or indexed PNG. If you
				1679	wish to do this, you must use the appropriate <a href="#depth">-depth</a>,
				1680	<a href="#colors">-colors</a>, or <a href="#type">-type</a> directives to
				1681	reduce the image quality prior to using the PNG encoder. Note that in
				1682	indexed PNG files, "bit-depth" refers to the number of bits per index,
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	1683	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]	1684	8-bit depth.</dd>
				1685
				1686	<dt>png:exclude-chunk=<em class="arg">value</em></dt>
				1687	<dt>png:include-chunk=<em class="arg">value</em></dt>
				1688	<dd>ancillary chunks to be excluded from or included in PNG output.
				1689
				1690	<p>The<em class="arg">value</em> can be the name of a PNG chunk-type such
				1691	as <em class="arg">bKGD</em>, a comma-separated list of chunk-types,
				1692	or the word <em class="arg">all</em> or
				1693	the word <em class="arg">none</em>. There must be no spaces in the
				1694	list. Although PNG chunk-names are case-dependent, you can use
				1695	all lowercase names if you prefer.</p>
				1696
				1697	<p>As a special case, if the <kbd>sRGB</kbd> chunk is excluded and
				1698	the <kbd>gAMA</kbd> chunk is included, the <kbd>gAMA</kbd> chunk will
				1699	only be written if gamma is not 1/2.2, since most decoders assume
				1700	sRGB and gamma=1/2.2 when no colorspace information is included in
				1701	the PNG file. Because the list is processed from left to right, you
				1702	can achieve this with a single define:</p>
				1703
				1704	<pre class="text">
				1705	-define png:include-chunk=none,gAMA
				1706	</pre>
				1707
				1708	<p>The critical PNG chunks <kbd>IHDR</kbd>, <kbd>PLTE</kbd>,
				1709	<kbd>IDAT</kbd>, and <kbd>IEND</kbd> cannot be excluded. Any of
				1710	these entries appearing in the list will be ignored.</p>
				1711
				1712	<p>If the ancillary PNG <kbd>tRNS</kbd> chunk is excluded and the
				1713	image has transparency, the PNG colortype is forced to be 4 or 6
				1714	(GRAY_ALPHA or RGBA). If the image is not transparent, then the
				1715	<kbd>tRNS</kbd> chunk isn't written anyhow, and there is no effect
				1716	on the PNG colortype of the output image.</p>
				1717
				1718	<p>The <a href="#strip">-strip</a> option does the equivalent of the
				1719	following for PNG output:</p>
				1720
				1721	<pre class="text">
				1722	-define png:include-chunk=none,gama
				1723	</pre>
				1724
				1725	<p>The default behavior is to include all known PNG ancillary chunks
				1726	plus ImageMagick's private <kbd>vpAg</kbd> ("virtual page") chunk.</p>
				1727	</dd>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1728
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1729	<dt>ps:imagemask</dt>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1730	<dd>If the ps:imagemask flag is defined, the PS3 and EPS3 coders will create
				1731	Postscript files that render bilevel images with the Postscript imagemask
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1732	operator instead of the image operator.</dd>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1733
cristy	045bd90	2010-01-30 18:56:24 +0000	[diff] [blame]	1734	<dt>quantum:format=<em class="arg">type</em></dt>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1735	<dd>Set the type to <kbd>floating-point</kbd> to specify a floating-point
				1736	format for raw files (e.g. GRAY:) or for MIFF and TIFF images in HDRI mode
				1737	to preserve negative values. If <a href="#depth">-depth</a> 16 is
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1738	included, the result is a single precision floating point format.
				1739	If <a href="#depth">-depth</a> 32 is included, the result is
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1740	double precision floating point format.</dd>
				1741
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1742	</dl>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1743
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1744	<p>For example, to create a postscript file that will render only the black
				1745	pixels of a bilevel image, use:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1746
				1747	<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]	1748	<p>Set attributes of the image registry by prefixing the value with
				1749	<kbd>registry:</kbd>. For example, to set a temporary path to put work files,
				1750	use:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1751
				1752	<p class="crtsnip">
				1753	-define registry:temporary-path=/data/tmp
				1754	</p>
				1755
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1756
				1757
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1758	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1759	<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]	1760	</div>
				1761
				1762	<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>
				1763
				1764	<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>
				1765
				1766	<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>
				1767
				1768
				1769	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1770	<h4><a id="delete"></a>-delete <em class="arg">index</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1771	</div>
				1772
				1773	<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>
				1774
				1775	<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>
				1776
				1777
				1778	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1779	<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]	1780	</div>
				1781
				1782	<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>
				1783
				1784	<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>
				1785
				1786	<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>
				1787
				1788	<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>
				1789
				1790	<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>
				1791
				1792	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1793	<h4><a id="depth"></a>-depth <em class="arg">value</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%'>depth of the image.</td><td style='text-align:right;'></td></tr></table>
				1797
				1798	<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>
				1799
				1800	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1801	<h4><a id="descend"></a>-descend</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1802	</div>
				1803
				1804	<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>
				1805
				1806	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1807	<h4><a id="deskew"></a>-deskew <em class="arg">threshold</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%'>straighten an image. A threshold of 40% works for most images.</td><td style='text-align:right;'></td></tr></table>
				1811
				1812	<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>
				1813
				1814	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1815	<h4><a id="despeckle"></a>-despeckle</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%'>reduce the speckles within an image.</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="direction"></a>-direction <em class="arg">type</em></h4>
cristy	2c83960	2010-04-03 02:32:08 +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%'>render text right-to-left or left-to-right.</td><td style='text-align:right;'></td></tr></table>
				1825
				1826	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1827	<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]	1828	</div>
				1829
				1830	<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>
				1831
				1832	<p>With this option, the 'overlay' image, and optionally the 'mask' image,
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1833	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]	1834	what part of the 'background' image is seen at each point of the overlaid
				1835	area. Much like the displacement map is a 'lens' that redirects light shining
				1836	through it so as to present a distorted view the original 'background' image
				1837	behind it. </p>
				1838
				1839	<p>Any perfect grey areas of the displacement map produce a zero
				1840	displacement of the image. Black areas produce the given maximum negative
				1841	displacement of the lookup point, while white produce a maximum positive
				1842	displacement of the lookup. </p>
				1843
				1844	<p>Note that it is the lookup of the 'background' that is displaced, not a
				1845	displacement of the image itself. As such an area of the displacement map
				1846	containing 'white' will have the lookup point 'shifted' by a positive amount,
				1847	and thus generating a copy of the destination image to the right/downward from
				1848	the correct position. That is the image will look like it may have been
				1849	'shifted' in a negative left/upward direction. Understanding this is a very
				1850	important in understanding how displacement maps work. </p>
				1851
				1852	<p>The given arguments define the maximum amount of displacement in pixels
				1853	that a particular map can produce. If the displacement scale is large enough
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1854	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]	1855	outside the bounds of the displacement map itself. That is you could very
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1856	easily copy a section of the original image from outside the overlay area
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1857	into the overlay area. </p>
				1858
				1859	<p>The '%' flag makes the displacement scale relative to the size of the
				1860	overlay image (100% = half width/height of image). Using '!' switches
				1861	percentage arguments to refer to the destination image size instead.
				1862	these flags were added as of IM v6.5.3-5.</p>
				1863
				1864	<p>Normally a single grayscale displacement map is provided, which with the
				1865	given scaling values will determine a single direction (vector) in which
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1866	displacements can occur (positively or negatively). However, if you also
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1867	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]	1868	the <em class="arg">composite image</em> is used for horizontal X
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1869	displacement, while the <em class="arg">mask image</em> is used for vertical Y
				1870	displacement. This allows you to define completely different displacement
				1871	values for the X and Y directions, and allowing you to lookup any point within
				1872	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]	1873	any other nearby pixel, producing complex 2 dimensional displacements, rather
				1874	than a simple 1 dimensional vector displacements. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1875
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1876	<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]	1877	you can use the 'red' channel of the overlay image to specify the horizontal
				1878	or X displacement, and the 'green' channel for the vertical or Y displacement.
				1879	</p>
				1880
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	1881	<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]	1882	mask the transparency of the destination image. However areas outside the
				1883	overlaid areas will not be effected. </p>
				1884
				1885
				1886	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1887	<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]	1888	</div>
				1889
				1890	<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>
				1891
				1892	<p>This option is used with convert for obtaining image or font from this X server. See <em class="arg">X(1)</em>.</p>
				1893
				1894	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1895	<h4><a id="dispose"></a>-dispose <em class="arg">method</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1896	</div>
				1897
				1898	<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>
				1899
				1900	<p>The layer disposal method defines the way each the displayed image is to be
				1901	modified after the current 'frame' of an animation has finished being
				1902	displayed (after its 'delay' period), but before the next frame on an
				1903	animation is to be overlaid onto the display. </p>
				1904
				1905	<p>Here are the valid methods:</p>
				1906
				1907	<pre class="text">
				1908	Undefined 0 No disposal specified (equivalent to '<kbd>none</kbd>').
				1909	None 1 Do not dispose, just overlay next frame image.
				1910	Background 2 Clear the frame area with the background color.
				1911	Previous 3 Clear to the image prior to this frames overlay.
				1912	</pre>
				1913
				1914	<p>You can also use the numbers given above, which is what the GIF format
				1915	uses internally to represent the above settings. </p>
				1916
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1917	<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]	1918
				1919	<p>Use <a href="#dispose" >+dispose</a>, turn off the setting and prevent
				1920	resetting the layer disposal methods of images being read in. </p>
				1921
				1922	<p>Use <a href="#set">-set</a> '<kbd>dispose</kbd>' method to set the image
				1923	disposal method for images already in memory.</p>
				1924
				1925	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1926	<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]	1927	</div>
				1928
				1929	<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>
				1930
				1931
				1932	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1933	<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]	1934	</div>
				1935
				1936	<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>
				1937
				1938	<p>The opacity of the composite image is multiplied by the given percent, then
				1939	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]	1940	is greater than 100, start dissolving the main image so it becomes
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1941	transparent at a value of '<kbd class="arg">200</kbd>'. If both percentages
				1942	are given, each image are dissolved to the percentages given. </p>
				1943
				1944	<p>Note that dissolve percentages do not add, two opaque images dissolved
				1945	'50,50', produce a 75% transparency. For a 50% + 50% blending of the two
				1946	images, you would need to use dissolve values of '50,100'. </p>
				1947
				1948	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1949	<h4><a id="distort"></a>-distort <em class="arg">method arguments</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1950	</div>
				1951
				1952	<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>
				1953
				1954	<p>The <em class="arg">arguments</em> is a single string containing a list
				1955	of floating point numbers separated by commas or spaces. The number of
				1956	and meaning of the floating point values depends on the distortion <em
				1957	class="arg">method</em> being used. </p>
				1958
				1959	<p>Choose from these distortion types:</p>
				1960
				1961	<table class="doc">
				1962	<tr valign="top">
				1963	<th align="left" style="width: 8%">Method</th>
				1964	<th align="left">Description</th>
				1965	</tr>
				1966
				1967	<tr valign="top">
				1968	<td valign="top"><kbd>ScaleRotateTranslate</kbd>
				1969	<br/>or   <kbd>SRT</kbd></td>
				1970	<td valign="top">
				1971	Distort image by first scaling and rotating about a given 'center',
				1972	before translating that 'center' to the new location, in that order. It
				1973	is an alternative method of specifying a '<kbd>Affine</kbd>' type of
				1974	distortion, but without shearing effects. It also provides a good way
				1975	of rotating and displacing a smaller image for tiling onto a larger
				1976	background (IE 2-dimensional animations). <br/>
				1977
				1978	The number of arguments determine the specific meaning of each
				1979	argument for the scales, rotation, and translation operations. <br/>
				1980
				1981	<table style="margin-left:auto; margin-right:auto;">
				1982	<tr><td>#  </td><td>arguments meaning</td></tr>
				1983	<tr><td>1:</td><td><em>Angle_of_Rotation</em></td></tr>
				1984	<tr><td>2:</td><td><em>Scale   Angle</em></td></tr>
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	1985	<tr><td>3:</td><td><em>X,Y     Angle</em></td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1986	<tr><td>4:</td><td><em>X,Y   Scale   Angle</em></td></tr>
				1987	<tr><td>5:</td>
				1988	<td><em>X,Y   ScaleX,ScaleY   Angle</em></td></tr>
				1989	<tr><td>6:</td>
				1990	<td><em>X,Y   Scale   Angle   NewX,NewY</em></td></tr>
				1991	<tr><td>7:</td>
				1992	<td><em>X,Y   ScaleX,ScaleY   Angle
				1993	NewX,NewY</em></td></tr>
				1994	</table>
				1995
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	1996	This is actually an alternative way of specifying a 2 dimensional linear
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	1997	'<kbd>Affine</kbd>' or '<kbd>AffineProjection</kbd>' distortion. </td> </tr>
				1998
				1999	<tr valign="top">
				2000	<td valign="top"><kbd>Affine</kbd></td>
				2001	<td valign="top">
				2002	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]	2003	of control points (as defined below). Ideally 3 sets or 12 floating
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2004	point values are given allowing the image to be linearly scaled,
				2005	rotated, sheared, and translated, according to those three points. See
				2006	also the related '<kbd>AffineProjection</kbd>' and '<kbd>SRT</kbd>'
				2007	distortions. <br/>
				2008
				2009	More than 3 sets given control point pairs (12 numbers) is least
				2010	squares fitted to best match a lineary affine distortion. If only 2
				2011	control point pairs (8 numbers) are given a two point image translation
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2012	rotation and scaling is performed, without any possible shearing,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2013	flipping or changes in aspect ratio to the resulting image. If only one
				2014	control point pair is provides the image is only translated, (which may
				2015	be a floating point non-integer translation). <br/>
				2016
				2017	This distortion does not include any form of perspective distortion.
				2018	</td>
				2019
				2020	</tr>
				2021
				2022	<tr valign="top">
				2023	<td valign="top"><kbd>AffineProjection</kbd></td>
				2024	<td valign="top">
				2025	Linearly distort an image using the given Affine Matrix of 6
				2026	pre-calculated coefficients forming a set of Affine Equations to map
				2027	the source image to the destination image.
				2028
				2029	<div style="text-align: center"><em>
				2030	s<sub>x</sub>, r<sub>x</sub>,
				2031	r<sub>y</sub>, s<sub>y</sub>,
				2032	t<sub>x</sub>, t<sub>y</sub>
				2033	</em></div>
				2034
				2035	See <a href="#affine" >-affine</a> setting for more detail, and
				2036	meanings of these coefficients. <br/>
				2037
				2038	The distortions '<kbd>Affine</kbd>' and '<kbd>SRT</kbd>' provide
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2039	alternative methods of defining this distortion, with ImageMagick doing
				2040	the calculations needed to generate the required coefficients. You can
				2041	see the internally generated coefficients, by using a <a
				2042	href="#verbose" >-verbose</a> setting with those other varients. </td>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2043
				2044	</tr>
				2045
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2046	<tr valign="top">
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2047	<td valign="top"><kbd>BilinearForward</kbd><br/>
				2048	<kbd>BilinearReverse</kbd></td>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2049	<td valign="top">
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2050	Bilinear Distortion, given a minimum of 4 sets of coordinate pairs, or
				2051	16 values (see below). Not that lines may not appear straight after
				2052	distortion, though the distance between coordinates will remain
				2053	consistent. <br/>
				2054
				2055	The '<kbd>BilinearForward</kbd>' is used to map rectangles to any
				2056	quadrilateral, while the '<kbd>BilinearReverse</kbd>' form maps any
				2057	quadrilateral to a rectangle, while preserving the straigth line edges
				2058	in each case. <br/>
				2059
				2060	Note that '<kbd>BilinearForward</kbd>' can generate invalid pixels
				2061	which will be colored using the <a href="#mattecolor" >-mattecolor</a>
				2062	color setting. Also if the quadraterial becomes 'flipped' the image
				2063	may dissappear. <br/>
				2064
				2065	There are future plans to produce a true Bilinear distortion that will
				2066	attempt to map any quadrilateral to any other quadrilateral, while
				2067	preserving edges (and edge distance ratios).
				2068
				2069	</td>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2070	</tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2071
				2072	<tr valign="top">
				2073	<td valign="top"><kbd>Perspective</kbd></td>
				2074	<td valign="top">
				2075	Perspective distort the images, using a list of 4 or more sets of
				2076	control points (as defined below). More that 4 sets (16 numbers) of
				2077	control points provide least squares fitting for more accurate
				2078	distortions (for the purposes of image registration and panarama
				2079	effects). Less than 4 sets will fall back to a '<kbd>Affine</kbd>'
				2080	linear distortion. <br/>
				2081
				2082	Perspective Distorted images ensures that straight lines remain
				2083	straight, but the scale of the distorted image will vary. The horizon
				2084	is anti-aliased, and the 'sky' color may be set using the
				2085	<a href="#mattecolor" >-mattecolor</a> setting. </td>
				2086	</tr>
				2087
				2088	<tr valign="top">
				2089	<td valign="top"><kbd>PerspectiveProjection</kbd>  </td>
				2090	<td valign="top">
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2091	Do a '<kbd>Perspective</kbd>' distortion biased on a set of 8
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2092	pre-calculated coefficients. You can get these coefficients by looking
				2093	at the <a href="#verbose" >-verbose</a> output of a
				2094	'<kbd>Prespective</kbd>' distortion, or by calculating them yourself.
				2095	If the last two perspective scaling coefficients are zero, the
				2096	remaining 6 represents a transposed 'Affine Matrix'. </td>
				2097
				2098	</tr>
				2099
				2100	<tr valign="top">
				2101	<td valign="top"><kbd>Arc</kbd></td>
				2102	<td valign="top">
				2103	Arc the image (variation of polar mapping) over the angle given around
				2104	a circle. <br/>
				2105	<table width="90%" style = "margin-left: auto; margin-right: auto;">
				2106	<tr valign="top"><td>Argument</td>
				2107	<td>Meaning</td></tr>
				2108	<tr valign="top"><td><em>arc_angle</em></td>
				2109	<td>The angle over which to arc the image side-to-side</td></tr>
				2110	<tr valign="top"><td><em>rotate_angle</em></td>
				2111	<td>Angle to rotate resulting image from vertical center</td></tr>
				2112	<tr valign="top"><td><em>top_radius</em></td>
				2113	<td>Set top edge of source image at this radius</td></tr>
				2114	<tr valign="top"><td><em>bottom_radius</em> </td>
				2115	<td>Set bottom edge to this radius (radial scaling)</td></tr>
				2116	</table>
				2117
				2118	The resulting image is always resized to best fit the resulting image,
				2119	(as if using <a href="#distort" >+distort</a>) while attempting to
				2120	preserve scale and aspect ratio of the original image as much as
				2121	possible with the arguments given by the user. All four arguments will
				2122	be needed to change the overall aspect ratio of an 'Arc'ed image. <br/>
				2123
				2124	This a variation of a polar distortion designed to try to preserve the
				2125	aspect ratio of the image rather than direct Cartesian to Polar
				2126	conversion. </td>
				2127	</tr>
				2128
				2129	<tr valign="top">
				2130	<td valign="top"><kbd>Polar</kbd></td>
				2131	<td valign="top">
				2132	Like '<kbd>Arc</kbd>' but do a complete Cartesian to Polar mapping of
				2133	the image. that is the height of the input image is mapped to the
				2134	radius limits, while the width is wrapped around between the
				2135	angle limits. <br/>
				2136
				2137	Arguments: <em>Rmax,Rmin CenterX,CenterY, start,end_angle</em> <br/>
				2138
				2139	All arguments are optional. With <em>Rmin</em> defaulting to zero, the
				2140	center to the center of the image, and the angles going from -180 (top)
				2141	to +180 (top). If <em>Rmax</em> is given the special value of
				2142	'<code>0</code>', the the distance from the center to the nearest edge
				2143	is used for the radius of the output image, which will ensure the whole
				2144	image is visible (though scaled smaller). However a special value of
				2145	'<code>-1</code>' will use the distance from the center to the furthest
				2146	corner, This may 'clip' the corners from the input rectangular image,
				2147	but will generate the exact reverse of a '<kbd>DePolar</kbd>' with
				2148	the same arguments. <br/>
				2149
				2150	If the plus form of distort (<a href="#distort" >+distort</a>) is used
				2151	output image center will default to <code>0,0</code> of the virtual
				2152	canvas, and the image size adjusted to ensure the whole input image is
				2153	made visible in the output image on the virtual canvas. </td>
				2154
				2155	</tr>
				2156
				2157	<tr valign="top">
				2158	<td valign="top"><kbd>DePolar</kbd></td>
				2159	<td valign="top">
				2160	Uses the same arguments and meanings as a '<kbd>Polar</kbd>' distortion
				2161	but generates the reverse Polar to Cartesian distortion. <br/>
				2162
				2163	The special <em>Rmax</em> setting of '<code>0</code>' may however clip
				2164	the corners of the input image. However using the special
				2165	<em>Rmax</em> setting of '<code>-1</code>' (maximum center to corner
				2166	distance) will ensure the whole distorted image is preserved in the
				2167	generated result, so that the same argument to '<kbd>Polar</kbd>' will
				2168	reverse the distortion re-producing the original.
				2169
				2170	Note that as this distortion requires the area resampling of a circular
				2171	arc, which can not be handled by the builtin EWA resampling function.
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2172	As such the normal EWA filters are turned off. It is recommended some
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2173	form of 'super-sampling' image processing technique be used to produce
				2174	a high quality result. </td>
				2175
				2176	</tr>
				2177
				2178	<tr valign="top">
				2179	<td valign="top"><kbd>Barrel</kbd></td>
				2180	<td valign="top">
				2181	Given the four coefficients (A,B,C,D) as defined by <a
				2182	href="http://www.all-in-one.ee/~dersch/barrel/barrel.html" >Helmut
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2183	Dersch</a>, perform a barrell or pin-cushion distortion appropriate to
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2184	correct radial lens distortions. That is in photographs, make straight
				2185	lines straight again. <br/>
				2186
				2187	Arguments: <em>A   B   C</em>   [ <em>D</em>   [
				2188	<em>X</em> , <em>Y</em> ] ] <br/>
				2189	or <em>A<sub>x</sub> B<sub>x</sub> C<sub>x</sub> D<sub>x</sub>
				2190	A<sub>y</sub> B<sub>y</sub> C<sub>y</sub> D<sub>y</sub></em>
				2191	[ <em>X</em> , <em>Y</em> ] <br/>
				2192	So that it forms the function <br/>
				2193	Rsrc = r * ( <em>A</em>r<sup>3</sup> + <em>B</em>r<sup>2</sup> +
				2194	<em>C</em>*r + <em>D</em> )<br/>
				2195
				2196	Where <em>X</em>,<em>Y</em> is the optional center of the distortion
				2197	(defaulting to the center of the image). <br/>
				2198	The second form is typically used to distort images, rather than
				2199	correct lens distortions. <br/>
				2200	</td>
				2201
				2202	</tr>
				2203
				2204	<tr valign="top">
				2205	<td valign="top"><kbd>BarrelInverse</kbd></td>
				2206	<td valign="top">
				2207	This is very simular to '<kbd>Barrel</kbd>' with the same set of
				2208	arguments, and argument handling. However it uses the inverse
				2209	of the radial polynomial,
				2210	so that it forms the function <br/>
				2211	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]	2212	<em>C</em>*r + <em>D</em> )<br/>
				2213	Note that this is not the reverse of the '<kbd>Barrel</kbd>'
				2214	distortion, just a different barrel-like radial distortion method.
				2215
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2216	</td>
				2217	</tr>
				2218
				2219	<tr valign="top">
				2220	<td valign="top"><kbd>Shepards</kbd></td>
				2221	<td valign="top">
				2222	Distort the given list control points (any number) using an Inverse
				2223	Squared Distance Interpolation Method (<a
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2224	href="http://en.wikipedia.org/wiki/Shepard%27s_method" >Shepards
				2225	Method</a>). The control points in effect do 'localized' displacement
				2226	of the image around the given control point (preserving the look and
				2227	the rotation of the area near the control points. For best results
				2228	extra control points should be added to 'lock' the positions of the
				2229	corners, edges and other unchanging parts of the image, to prevent
				2230	their movement. <br/>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2231
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2232	The distortion has been likened to 'taffy pulling' using nails, or
				2233	pins' stuck in a block of 'jelly' which is then moved to the new
				2234	position, distorting te surface of the jelly. <br/>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2235
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2236	Internally it is equivelent to generating a displacement map (see <a
				2237	href="#displace" >-displace</a>) for source image color look-up using
				2238	the <a href="#sparse-color" >-sparse-color</a> method of the same name.
				2239
				2240	</td>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2241	</tr>
				2242
				2243	</table>
				2244
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2245	<p>To print a complete list of distortion methods, use <a href="#list">-list
				2246	distort</a>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2247
				2248	<p>Many of the above distortion methods such as '<kbd>Affine</kbd>',
				2249	'<kbd>Perspective</kbd>', and '<kbd>Shepards</kbd>' use a list control points
				2250	defining how these points in the given image should be distorted in the
				2251	destination image. Each set of four floating point values represent a source
				2252	image coordinate, followed immediately by the destination image coordinate.
				2253	This produces a list of values such as...</p>
				2254	<div style="text-align: center"><em>
				2255	U<sub>1</sub>,V<sub>1</sub> X<sub>1</sub>,Y<sub>1</sub>
				2256	U<sub>2</sub>,V<sub>2</sub> X<sub>2</sub>,Y<sub>2</sub>
				2257	U<sub>3</sub>,V<sub>3</sub> X<sub>3</sub>,Y<sub>3</sub>
				2258	...
				2259	U<sub>n</sub>,V<sub>n</sub> X<sub>n</sub>,Y<sub>n</sub>
				2260	</em></div>
				2261	<p>where <em>U,V</em> on the source image is mapped to <em>X,Y</em> on the
				2262	destination image. </p>
				2263
				2264	<p>For example, to warp an image using '<kbd>perspective</kbd>' distortion,
				2265	needs a list of at least 4 sets of coordinates, or 16 numbers. Here is the
				2266	perspective distortion of the built-in "rose:" image. Note how spaces were
				2267	used to group the 4 sets of coordinate pairs, to make it easier to read and
				2268	understand.</p>
				2269
				2270	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2271	convert rose: -virtual-pixel black \<br/>
				2272	-distort Perspective '0,0,0,0 0,45,0,45 69,0,60,10 69,45,60,35' \<br/>
				2273	rose_3d_rotated.gif</span></p>
				2274	<p>If more that the required number of coordinate pairs are given for
				2275	a distortion, the distortion method is 'least squares' fitted to produce the
				2276	best result for all the coordinate pairs given. If less than the ideal number
				2277	of points are given, the distort will generally fall back to a simpler form of
				2278	distortion that can handles the smaller number of coordinates (usally a linear
				2279	'<kbd>Affine</kbd>' distortion). </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2280
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2281	<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]	2282	find matching coordinate pairs in overlapping images, so as to improve the
				2283	'fit' of the distortion. Of course a bad coordinate pair can also make the
				2284	'fit' worse. Caution is always advised. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2285
				2286	<p>Colors are acquired from the source image according to the <a
				2287	href="#interpolate" >-interpolate</a> color lookup setting, when the image is
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2288	magnified. However if the viewed image is minified (image becomes smaller),
				2289	a special area resampling function (added ImageMagick v6.3.5-9), is used to
				2290	produce a higher quality image. For example you can use
				2291	a '<kbd>perspective</kbd>' distortion to view a infinitely tiled 'plane' all
				2292	the way to the horizon. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2293
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2294	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>
				2295	convert -size 90x90 pattern:checkerboard -normalize -virtual-pixel tile \<br/>
				2296	-distort perspective '0,0,5,45 89,0,45,46 0,89,0,89 89,89,89,89' \<br/>
				2297	checks_tiled.jpg</span></p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2298	<p>Note that a infinitely tiled perspective images involving the horizon can
				2299	be very slow to generate due to the use of the high quality 'area resampling'
				2300	function (added ImageMagick v6.3.5-9). You can turn off 'area resampling'
				2301	using a <a href="#filter" >-filter</a> setting of '<kbd>point</kbd>'
				2302	(recommended if you plan to use super-sampling instead). </p>
				2303
				2304	<p>If an image generates <i>invalid pixels</i>, such as the 'sky' in the last
				2305	'<kbd>perspective</kbd>' distortion example, <a href="#distort" >-distort</a>
				2306	will use the current <a href="#mattecolor" >-mattecolor</a> setting for these
				2307	pixels. If you do not what these pixels to be visible, set the color to match
				2308	the rest of the ground. </p>
				2309
				2310	<p>The output image size will by default be the same as the input image. This
				2311	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]	2312	the 'distorted space', those parts is clipped and lost. However if you use
				2313	the plus form of the operator (<a href="#distort" >+distort</a>) the operator
				2314	will attempt (if possible) to show the whole of the distorted image, while
				2315	retaining a correct 'virtual canvas' offset, for image layering. This offset
				2316	may need to be removed using <a href="#repage" >+repage</a>, to remove if it
				2317	is unwanted. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2318
				2319	<p>You can alternatively specify a special "<kbd><a href="#set" >-set</a>
				2320	option:distort:viewport {geometry_string}</kbd>" setting which will specify
				2321	the size and the offset of the generated 'viewport' image of the distorted
				2322	image space.</p>
				2323
				2324	<p>Adding a "<kbd><a href="#set" >-set</a> option:distort:scale
				2325	{scale_factor}</kbd>" will scale the output image (viewport or otherwise) by
				2326	that factor without changing the viewed contents of the distorted image. This
				2327	can be used either for 'super-sampling' the image for a higher quality result,
				2328	or for panning and zooming around the image (with appropriate viewport
				2329	changes, or post-distort cropping and resizing). </p>
				2330
				2331	<p>Setting <a href="#verbose" >-verbose</a> setting, will cause <a
				2332	href="#distort" >-distort</a> to attempt to output the internal coefficients,
				2333	and the <a href="#fx" >-fx</a> equivalent to the distortion, for expert study,
				2334	and debugging purposes. This many not be available for all distorts. </p>
				2335
				2336	<p>Affine rotations and shears (such as '<kbd>SRT</kbd>' distortion), tend to
				2337	produce a cleaner result that the equivalent <a href="#rotate" >-rotate</a>
				2338	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]	2339	above settings. It is algorithmically slower however, though that may not be
				2340	the case in ImageMagick's implementation. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2341
				2342
				2343	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2344	<h4><a id="dither"></a>-dither <em class="arg">method</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2345	</div>
				2346
				2347	<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>
				2348
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2349	<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]	2350
				2351	<p>Dithering is turned on by default, to turn it off use the plus form of the
				2352	setting, <a href="#dither">+dither</a>. This will also also render PostScript
				2353	without text or graphic aliasing. Disabling dithering often (but not always)
				2354	leads to faster process, a smaller number of colors, but more cartoon like
				2355	image coloring. Generally resulting in 'color banding' effects in areas with
				2356	color gradients. </p>
				2357
				2358	<p>The color reduction operators <a href="#colors">-colors</a>, <a
				2359	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>
				2360
				2361	<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>
				2362
				2363
				2364	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2365	<h4><a id="draw"></a>-draw <em class="arg">string</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2366	</div>
				2367
				2368	<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>
				2369
				2370	<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>
				2371
				2372	<p>The shape primitives:</p>
				2373
				2374	<pre class="text">
				2375	point x,y
				2376	line x0,y0 x1,y1
				2377	rectangle x0,y0 x1,y1
				2378	roundRectangle x0,y0 x1,y1 wc,hc
				2379	arc x0,y0 x1,y1 a0,a1
				2380	ellipse x0,y0 rx,ry a0,a1
				2381	circle x0,y0 x1,y1
				2382	polyline x0,y0 ... xn,yn
				2383	polygon x0,y0 ... xn,yn
				2384	bezier x0,y0 ... xn,yn
				2385	path path specification
				2386	image operator x0,y0 w,h filename
				2387	</pre>
				2388
				2389	<p>The text primitive:</p>
				2390
				2391	<pre class="text">
				2392	text x0,y0 string
				2393	</pre>
				2394	<p>The text gravity primitive:</p>
				2395
				2396	<pre class="text">
				2397	gravity NorthWest, North, NorthEast, West, Center,
				2398	East, SouthWest, South, or SouthEast
				2399	</pre>
				2400
				2401	<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>
				2402
				2403	<p>The transformation primitives:</p>
				2404
				2405	<pre class="text">
				2406	rotate degrees
				2407	translate dx,dy
				2408	scale sx,sy
				2409	skewX degrees
				2410	skewY degrees
				2411	</pre>
				2412
				2413	<p>The pixel operation primitives:</p>
				2414
				2415	<pre class="text">
				2416	color x0,y0 method
				2417	matte x0,y0 method
				2418	</pre>
				2419
				2420	<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>
				2421
				2422	<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>
				2423
				2424	<p>A <kbd>line</kbd> primitive requires a start point and end point.</p>
				2425
				2426	<p>A <kbd>rectangle</kbd> primitive is specified by the pair of points at the upper left and lower right corners.</p>
				2427
				2428	<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>
				2429
				2430	<p>The <kbd>circle</kbd> primitive makes a disk (filled) or circle (unfilled). Give the center and any point on the perimeter (boundary).</p>
				2431
				2432	<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>
				2433
				2434	<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>
				2435
				2436	<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>.
				2437	</p>
				2438
				2439	<p>A <em>coordinate</em> is a pair of integers separated by a space or optional comma. </p>
				2440
				2441	<p>As an example, to define a circle centered at 100,100 that extends to 150,150 use:</p>
				2442
				2443	<p class="crtsnip">
				2444	-draw 'circle 100,100 150,150'
				2445	</p>
				2446
				2447	<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
				2448	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>
				2449
				2450	<p class="crtsnip">
				2451	-draw 'bezier 20,50 45,100 45,0 70,50'
				2452	</p>
				2453	<p class="crtsnip">
				2454	-draw 'bezier 70,50 95,100 95,0 120,50'
				2455	</p>
				2456
				2457
				2458	<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>
				2459
				2460	<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>
				2461
				2462	<p class="crtsnip">
				2463	-draw 'image SrcOver 100,100 225,225 image.jpg'
				2464	</p>
				2465
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	2466	<p>You can use 0,0 for the image size, which means to use the actual
				2467	dimensions found in the image header. Otherwise, it is scaled to the given
				2468	dimensions. See <a href="../www/compose.html">Alpha Compositing</a> for
				2469	a detailed discussion of alpha composition methods that are available. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2470
				2471	<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>
				2472
				2473	<p>For example, the following annotates the image with <kbd>Works like magick!</kbd> for an image titled <kbd>bird.miff</kbd>. </p>
				2474
				2475	<p class="crtsnip">
				2476	-draw 'text 100,100 "Works like magick!"'
				2477	</p>
				2478
				2479	<p>See the <a href="#annotate">-annotate</a> option for another convenient way to annotate an image with text.</p>
				2480
				2481	<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>
				2482
				2483	<p>The <kbd>translate</kbd> primitive translates subsequent shape and text primitives.</p>
				2484
				2485	<p>The <kbd>scale</kbd> primitive scales them.</p>
				2486
				2487	<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>
				2488
				2489	<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
				2490	matrix.</p>
				2491
				2492	<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>
				2493
				2494	<pre class="text">
				2495	point
				2496	replace
				2497	floodfill
				2498	filltoborder
				2499	reset
				2500	</pre>
				2501
				2502	<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>
				2503
				2504	<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>
				2505
				2506	<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>
				2507
				2508	<p>Strings that begin with a number must be quoted (e.g. use '1.png' rather than 1.png).</p>
				2509
				2510	<p>Drawing primitives conform to the <a href="../www/magick-vector-graphics.html">Magick Vector Graphics</a> format.</p>
				2511
				2512
				2513	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2514	<h4><a id="edge"></a>-edge <em class="arg">radius</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2515	</div>
				2516
				2517	<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>
				2518
				2519	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2520	<h4><a id="emboss"></a>-emboss <em class="arg">radius</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2521	</div>
				2522
				2523	<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>
				2524
				2525	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2526	<h4><a id="encipher"></a>-encipher <em class="arg">filename</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2527	</div>
				2528
				2529	<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>
				2530
				2531	<p>Get the passphrase from the file specified by <em class="arg">filename</em>.</p>
				2532
				2533	<p>For more information, see the webpage, <a href="http://www.imagemagick.org/www/cipher.html">ImageMagick: Encipher or Decipher an Image</a>.</p>
				2534
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2535
				2536
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2537	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2538	<h4><a id="encoding"></a>-encoding <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2539	</div>
				2540
				2541	<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>
				2542
				2543	<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>
				2544
				2545	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2546	<h4><a id="endian"></a>-endian <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2547	</div>
				2548
				2549	<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>
				2550
				2551	<p>To print a complete list of endian types, use the <a href="#list">-list endian</a> option.</p>
				2552
				2553	<p>Use <a href="#endian">+endian</a> to revert to unspecified endianness.</p>
				2554
				2555
				2556	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2557	<h4><a id="enhance"></a>-enhance</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2558	</div>
				2559
				2560	<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>
				2561
				2562
				2563	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2564	<h4><a id="equalize"></a>-equalize</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2565	</div>
				2566
				2567	<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>
				2568
				2569	<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>
				2570
				2571	<p>For example using HSL, we have: ... <kbd>-colorspace HSL -channel lightness -equalize -colorspace RGB</kbd> ...</p>
				2572
				2573	<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>
				2574
				2575	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2576	<h4><a id="evaluate"></a>-evaluate <em class="arg">operator value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2577	</div>
				2578
				2579	<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>
				2580
				2581	<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>
				2582
				2583	<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>
				2584
				2585	<table class="doc">
				2586	<col width="25%" />
				2587	<col width="75%" />
				2588	<thead>
				2589	<tr>
				2590	<th><em class="arg">operator</em></th>
				2591	<th>Summary (see further below for details)</th>
				2592	</tr>
				2593	</thead>
				2594	<tbody>
				2595
cristy	3c98a4f	2010-08-13 20:09:41 +0000	[diff] [blame]	2596	<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]	2597	<tr><td>Add </td> <td>Add <em class="arg">value</em> to pixels. </td></tr>
				2598	<tr><td>AddModulus </td> <td>Add <em class="arg">value</em> to pixels modulo <em class="QR">QuantumRange</em>.</td></tr>
				2599	<tr><td>And </td> <td>Binary AND of pixels with <em class="arg">value</em>.</td></tr>
				2600	<tr><td>Cos, Cosine </td> <td>Apply cosine to pixels with frequency <em class="arg">value</em> with 50% bias added.</td></tr>
				2601	<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]	2602	<tr><td>Exp </td> <td>base-e exponential function</td></tr>
				2603	<tr><td>Exponential </td> <td>base-e exponential function</td></tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2604	<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>
				2605	<tr><td>Log </td> <td>Apply scaled logarithm to normalized pixels.</td></tr>
				2606	<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]	2607	<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]	2608	<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]	2609	<tr><td>Min </td> <td>Clip pixels at upper bound <em class="arg">value</em>.</td></tr>
				2610	<tr><td>Multiply </td> <td>Multiply pixels by <em class="arg">value</em>.</td></tr>
				2611	<tr><td>Or </td> <td>Binary OR of pixels with <em class="arg">value</em>.</td></tr>
				2612	<tr><td>Pow </td> <td>Raise normalized pixels to the power <em class="arg">value</em>.</td></tr>
				2613	<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>
				2614	<tr><td>Set </td> <td>Set pixel equal to <em class="arg">value</em>.</td></tr>
				2615	<tr><td>Sin, Sine </td> <td>Apply sine to pixels with frequency <em class="arg">value</em> with 50% bias added.</td></tr>
				2616	<tr><td>Subtract </td> <td>Subtract <em class="arg">value</em> from pixels.</td></tr>
				2617	<tr><td>Xor </td> <td>Binary XOR of pixels with <em class="arg">value.</em></td></tr>
				2618
				2619	<tr><td> </td></tr>
				2620
				2621	<tr><td>Gaussian-noise</td></tr>
				2622	<tr><td>Impulse-noise</td></tr>
				2623	<tr><td>Laplacian-noise</td></tr>
				2624	<tr><td>Multiplicative-noise</td> <td>(These are equivalent to the corresponding <a href="#noise" >-noise</a> operators.)</td></tr>
				2625	<tr><td>PoissonNoise</td></tr>
				2626	<tr><td>Uniform-noise</td></tr>
				2627
				2628	<tr><td> </td></tr>
				2629
				2630	<tr><td>Threshold </td> <td>Threshold pixels larger than <em class="arg">value</em>.</td></tr>
				2631	<tr><td>ThresholdBlack </td> <td>Threshold pixels to zero values equal to or below <em class="arg">value</em>.</td></tr>
				2632	<tr><td>ThresholdWhite </td> <td>Threshold pixels to maximum values above <em class="arg">value</em>. </td></tr>
				2633	</tbody>
				2634	</table>
				2635
				2636	<p>The specified functions are applied only to each previously set <a
				2637	href="#channel" >-channel</a> in the image. If necessary, the results of the
				2638	calculations are truncated (clipped) to fit in the interval [0, <em
				2639	class="QR">QuantumRange</em>]. The transparency channel of the image is
				2640	represented as a 'alpha' values (0 = fully transparent), so, for example, a
				2641	<kbd>Divide</kbd> by 2 of the alpha channel will make the image
				2642	semi-transparent. Append the percent symbol '<kbd>%</kbd>' to specify a value
				2643	as a percentage of the <em class="QR">QuantumRange</em>.</p>
				2644
				2645	<p>To print a complete list of <a href="#evaluate">-evaluate</a> operators, use
				2646	<a href="#list">-list evaluate</a>.</p>
				2647
				2648	<p>The results of the <kbd>Add</kbd>, <kbd>Subtract</kbd> and
				2649	<kbd>Multiply</kbd> methods can also be achieved using either the <a
				2650	href="#level" >-level</a> or the <a href="#level" >+level</a> operator, with
				2651	appropriate argument, to linearly modify the overall range of color values.
				2652	Please note, however, that <a href="#level" >-level</a> treats transparency as
				2653	'matte' values (0 = opaque), while <a href="#level" >-evaluate</a> works with
				2654	'alpha' values.</p>
				2655
				2656	<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>
				2657
cristy	ce66ab1	2010-10-21 23:36:32 +0000	[diff] [blame]	2658	<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>
				2659
				2660	<div style="text-align:center;">
				2661	exp(<em class="arg">value</em> × <b><em>u</em></b>)
				2662	</div>
				2663
				2664	<p> If the input image is squared, for example, using <a
				2665	href="#-function" >-function polynomial "2 0 0"</a>, then a decaying Gaussian function will be the result.</p>
				2666
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2667	<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>
				2668
				2669	<div style="text-align:center;">
				2670	log(<em class="arg">value</em> × <b><em>u</em></b> + 1) / log(<em class="arg">value</em> + 1)
				2671	</div>
				2672
				2673	<p><kbd>Pow</kbd> has been added as of ImageMagick 6.4.1-9, and works on
				2674	normalized pixel values. Note that <kbd>Pow</kbd> is related to the <a
				2675	href="#gamma" >-gamma</a> operator. For example, <b>-gamma 2</b> is equivalent
				2676	to <b>-evaluate pow 0.5</b>, i.e., a 'square root' function. The value used
				2677	with <a href="#gamma" >-gamma</a> is simply the reciprocal of the value used
				2678	with <kbd>Pow</kbd>.</p>
				2679
				2680	<p><kbd>Cosine</kbd> and <kbd>Sine</kbd> was added as of IM v6.4.8-8 and
				2681	converts the image values into a value according to a (co)sine wave function.
				2682	The synonyms <kbd>Cos</kbd> and <kbd>Sin</kbd> may also be used. The output
				2683	is biased 50% and normalized by 50% so as to fit in the respective color value
				2684	range. The <em class="arg">value</em> scaling of the <em>period</em> of the
				2685	function (its frequency), and thus determines the number of 'waves' that will
				2686	be generated over the input color range. For example, if the <em
				2687	class="arg">value</em> is 1, the effective period is simply the <em
				2688	class="QR">QuantumRange</em>; but if the <em class="arg">value</em> is 2,
				2689	then the effective period is the <em>half</em> the <em
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2690	class="QR">QuantumRange</em>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2691
				2692	<div style="text-align:center;">
				2693	0.5 + 0.5 × cos(2 π <b><em>u</em></b> × <em class="arg">value</em>).
				2694	</div>
				2695
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2696	<p>See also the <a href="#function" >-function</a> operator, which is a
				2697	multi-value version of evaluate. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2698
cristy	63fed27	2010-03-07 19:08:45 +0000	[diff] [blame]	2699	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2700	<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]	2701	</div>
				2702
				2703	<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]	2704
				2705	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2706	<h4><a id="extent"></a>-extent <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2707	</div>
				2708
				2709	<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>
				2710
cristy	3e2860c	2010-01-24 01:36:30 +0000	[diff] [blame]	2711	<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]	2712	<p>This command reduces or expands a JPEG image to fit on an 800x600
				2713	display. If the aspect ratio of the input image isn't exactly 4:3, then the
				2714	image is centered on an 800x600 black canvas: </p>
				2715
				2716	<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>
				2717
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2718
				2719	<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>
				2720
				2721	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2722	<h4><a id="extract"></a>-extract <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2723	</div>
				2724
				2725	<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>
				2726
				2727	<p>This option is most useful for extracting a subregion of a very large raw image. Note that these two commands are equivalent:</p>
				2728
cristy	4949d52	2010-03-12 18:41:34 +0000	[diff] [blame]	2729	<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]	2730
cristy	4949d52	2010-03-12 18:41:34 +0000	[diff] [blame]	2731	<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]	2732	<p>the image is <em>resized</em> to the specified dimensions instead,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2733	equivalent to:</p>
				2734
				2735	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert -size 16000x16000 -depth 8 -resize 640x480 image.rgb image.png</span></p>
				2736	<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>
				2737
				2738	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2739	<h4><a id="family"></a>-family <em class="arg">fontFamily</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2740	</div>
				2741
				2742	<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>
				2743
				2744	<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).
				2745	</p>
				2746
				2747	<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>.
				2748	</p>
				2749
				2750	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2751	<h4><a id="features"></a>-features <em class="arg">distance</em></h4>
cristy	7396d88	2010-01-27 02:37:56 +0000	[diff] [blame]	2752	</div>
				2753
				2754	<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>
				2755
				2756	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2757	<h4><a id="fft"></a>-fft</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2758	</div>
				2759
				2760	<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>
				2761
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2762	<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]	2763
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2764	<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]	2765
				2766	<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>
				2767
				2768	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert image.png -fft fft_image.miff</span></p>
				2769	<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>
				2770
				2771	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert image.png -fft fft_image.png</span></p>
				2772	<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>
				2773
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	2774	<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]	2775
				2776	<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>
				2777
				2778	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert fft_image.miff[0] -contrast-stretch 0 \ <br />
				2779	-evaluate log 1000 fft_image_spectrum.png</span></p>
				2780	<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>
				2781
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2782	<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]	2783
				2784	<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>
				2785
				2786	<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>
				2787
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2788	<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]	2789
				2790	<p>See the discussion on HDRI implementations of ImageMagick on the page
				2791	<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.
				2792	</p>
				2793
				2794
				2795	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2796	<h4><a id="fill"></a>-fill <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2797	</div>
				2798
				2799	<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>
				2800
				2801	<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>
				2802
				2803	<p>Enclose the color specification in quotation marks to prevent the "#" or the parentheses from being interpreted by your shell.</p>
				2804
				2805	<p>For example,</p>
				2806
				2807	<p class="crtsnip">
				2808	-fill blue
				2809	</p>
				2810	<p class="crtsnip">
				2811	-fill "#ddddff"
				2812	</p>
				2813	<p class="crtsnip">
				2814	-fill "rgb(255,255,255)"
				2815	</p>
				2816
				2817	<p>See <a href="#draw">-draw</a> for further details.</p>
				2818
				2819	<p>To print a complete list of color names, use the <a href="#list">-list color</a> option.</p>
				2820
				2821	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2822	<h4><a id="filter"></a>-filter <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2823	</div>
				2824
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2825	<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
				2826	distorting an image.</td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2827
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2828	<p>Use this option to affect the resizing operation of an image during
				2829	operations such as <a href="#resize">-resize</a> and <a href="#distort"
				2830	>-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]	2831
				2832	<pre class="text">
				2833	Point Hermite Cubic
				2834	Box Gaussian Catrom
				2835	Triangle Quadratic Mitchell
				2836	</pre>
				2837
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2838	<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]	2839	as a faster <kbd>SincFast</kbd> equivalent form). However these filters are
				2840	generally useless on their own as they are infinite filters that are being
				2841	clipped to the filters support size. Their direct use is not recommended
				2842	except via expert settings (see below). </p>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2843
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2844	<p>Instead these special filter functions are typically windowed by a windowing
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2845	function that the <a href="#filter" >-filter</a> setting defines. That is
				2846	using these functions will define a 'Windowed' filter, appropriate to the
				2847	operator involved. Windowed filters include: </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2848
				2849	<pre class="text">
				2850	Lanczos Hamming Parzen
				2851	Blackman Kaiser Welsh
				2852	Hanning Bartlett Bohman
				2853	</pre>
				2854
				2855	<p>Also one special self-windowing filter is also provided
				2856	<kbd>Lagrange</kbd>, which will automagically re-adjust its function depending
				2857	on the current 'support' or 'lobes' expert settings (see below).</p>
				2858
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2859	<p>If you do not select a filter with this option, the filter defaults to
				2860	<kbd>Mitchell</kbd> for a colormapped image, a image with a matte channel, or
				2861	if the image is enlarged. Otherwise the filter default to
				2862	<kbd>Lanczos</kbd>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2863
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2864	<p>To print a complete list of resize filters, use the <a href="#list">-list
				2865	filter</a> option.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2866
				2867	<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]	2868	use of these expert settings (see also <a href="#define" >-define</a> and <a
				2869	href="#set" >-set</a>):-</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2870
				2871	<dl class="doc">
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2872	<dt>-define filter:blur=<em>factor</em></dt>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2873	<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]	2874	blurry or < 1.0 for sharp. This should only be used with Gaussian and
				2875	Gaussian-like filters simple filters, or you may not get the expected
				2876	results. </dd>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2877
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2878	<dt>-define filter:support=<em>radius</em></dt>
				2879	<dd>Set the filter support radius. Defines how large the filter should be and
				2880	thus directly defines how slow the filtered resampling process is. All
				2881	filters have a default 'prefered' support size. Some filters like
				2882	<kbd>Lagrange</kbd> and windowed filters adjust themselves depending on
				2883	this value. With simple filters this value either does nothing (but slow
				2884	the resampling), or will clip the filter function in a detrimental way.
				2885	</dd>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2886
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2887	<dt>-define filter:lobes=<em>count</em></dt>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2888	<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]	2889	alternative way of specifying the 'support' range of the filter, that is
				2890	designed to be more suited to windowed filters, especially when used for
				2891	image distorts.</dd>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2892
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2893	<dt>-define filter:b=<em>b-spline_factor</em></dt>
				2894	<dt>-define filter:c=<em>keys_alpha_factor</em></dt>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2895	<dd>Redefine the values used for cubic filters such as <kbd>Cubic</kbd>,
				2896	<kbd>Catrom</kbd>, <kbd>Mitchel</kbd>, and <kbd>Hermite</kbd>, as well as
				2897	the <kbd>Parzen</kbd> Sinc windowing function. If only one of the values
				2898	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]	2899	filter. Values meaning was defined by a research paper by
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2900	Mitchell-Netravali.</dd>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2901
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2902	<dt>-define filter:filter=<em>filter_function</em></dt>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2903	<dd>Use this function directly as the scaling filter. This will allow
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2904	you to directly use a windowing filter such as <kbd>Blackman</kbd>,
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2905	rather than as its normal usage as a windowing function for 'Sinc' or
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2906	'Bessel' functions. If defined, no windowing function is used, unless the
				2907	following expert setting is also defined.</dd>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2908
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2909	<dt>-define filter:window=<em>filter_function</em></dt>
				2910	<dd>The IIR (infinite impulse response) filters <kbd>Bessel</kbd> and
				2911	<kbd>Sinc</kbd> are windowed (brought down to zero over the defined
				2912	support range) with the given filter. This allows you to specify a filter
				2913	function that is not normally used as a windowing function, such as
				2914	<kbd>Box</kbd>, (which effectively turns off the windowing function),
				2915	to window a <kbd>Sinc</kbd>, or the function the previous setting defined.
				2916	</dd>
				2917
				2918	<dt>-define filter:verbose=<em>1</em></dt>
				2919	<dd>This causes IM to print information on the final internal filter
				2920	selection to standard output. This includes a commented header on the
				2921	filter settings being used, and data allowing the filter weights to be
				2922	easily graphed. </dd>
				2923
				2924	<dd>Note however that some filters are internally defined in terms of other
				2925	filters. The <kbd>Lanczos</kbd> filter for example is defined in terms of
				2926	a <kbd>SincFast</kbd> windowed <kbd>SincFast</kbd> filter, while
				2927	<kbd>Mitchell</kbd> is defined as a <kbd>Cubic</kbd> filter with specific
				2928	'B' and 'C' settings. </dd>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2929
				2930	</dl>
				2931
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	2932	<p>For example, to get a 8 lobe Bessel windowed Bessel filter:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2933
				2934	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert image.png -filter bessel \ <br/>
				2935	-set filter:window=bessel -set filter:lobes=8 \ <br/>
				2936	-resize 150% image.jpg</span></p>
				2937	<p>Or a raw un-windowed Sinc filter with 4 lobes:</p>
				2938
				2939	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert image.png -set filter:filter=sinc -set filter:lobes=4 \ <br/>
				2940	-resize 150% image.jpg</span></p>
				2941	<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]	2942	filters, and 'verbose' for viewing the internal filter selection), are
				2943	provided for image processing experts who have studied and understood how
				2944	resize filters work. Without this knowledge, and an understanding of the
				2945	definition of the actual filters involved, using expert settings are more
				2946	likely to be detrimental to your image resizing.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2947
				2948
				2949	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2950	<h4><a id="flatten"></a>-flatten</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2951	</div>
				2952
				2953	<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>
				2954
				2955
				2956	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2957	<h4><a id="flip"></a>-flip</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2958	</div>
				2959
				2960	<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>
				2961
				2962	<p>reflect the scanlines in the vertical direction.</p>
				2963
				2964	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2965	<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]	2966	</div>
				2967
				2968	<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>
				2969
				2970	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2971	<h4><a id="flop"></a>-flop</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 horizontal direction.</p>
				2977
				2978
				2979	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2980	<h4><a id="font"></a>-font <em class="arg">name</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2981	</div>
				2982
				2983	<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>
				2984
				2985	<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>
				2986
				2987	<p>In addition to the fonts specified by the above pre-defined list, you can
				2988	also specify a font from a specific source. For example <kbd>Arial.ttf</kbd>
				2989	is a TrueType font file, <kbd>ps:helvetica</kbd> is PostScript font, and
				2990	<kbd>x:fixed</kbd> is X11 font.</p>
				2991
				2992	<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>
				2993
				2994
				2995	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	2996	<h4><a id="foreground"></a>-foreground <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	2997	</div>
				2998
				2999	<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>
				3000
				3001	<p>The color is specified using the format described under the <a href="#fill">-fill</a> option.</p>
				3002
				3003	<p>The default foreground color is black.</p>
				3004
				3005	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3006	<h4><a id="format"></a>-format <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3007	</div>
				3008
				3009	<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>
				3010
				3011	<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>
				3012
				3013	<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>
				3014
				3015	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3016	<h4><a id="format_identify_"></a>-format <em class="arg">string</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3017	</div>
				3018
				3019	<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>
				3020
				3021	<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>
				3022
				3023	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3024	<h4><a id="frame"></a>-frame <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3025	</div>
				3026
				3027	<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>
				3028
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	3029	<p>The color of the border is specified with the <a href="#mattecolor"
				3030	>-mattecolor</a> command line option. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3031
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	3032	<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
				3033	class="arg">geometry</em> argument indicates the amount of extra width and
				3034	height that is added to the dimensions of the image. If no offsets are given
				3035	in the <em class="arg">geometry</em> argument, then the border added is
				3036	a solid color. Offsets <em>x</em> and <em>y</em>, if present, specify that
				3037	the width and height of the border is partitioned to form an outer bevel of
				3038	thickness <em>x</em> pixels and an inner bevel of thickness
				3039	<em>y</em> pixels. Negative offsets make no sense as frame arguments.
				3040	</p>
				3041
				3042	<p>The <a href="#frame">-frame</a> option is affected by the current <a
				3043	href="#compose">-compose</a> setting and assumes that this is using the default
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3044	'<kbd>Over</kbd>' composition method. It generates a image of the appropriate
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	3045	size with the current <a href="#bordercolor">-bordercolor</a> setting, and then
				3046	draws the frame of four distinct colors close to the current <a
				3047	href="#mattecolor">-mattecolor</a>. The original image is then overlaid onto
				3048	center of this image. This means that with the default compose method of
				3049	'<kbd>Over</kbd>' any transparent parts may be replaced by the current <a
				3050	href="#bordercolor">-bordercolor</a> setting.</p>
				3051
				3052	<p>The image composition is not
				3053	affected by the <a href="#gravity">-gravity</a> option.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3054
				3055
				3056	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3057	<h4><a id="frame_import_"></a>-frame</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3058	</div>
				3059
				3060	<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>
				3061
				3062	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3063	<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]	3064	</div>
				3065
				3066	<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>
				3067
				3068	<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>
				3069
				3070	<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>
				3071
				3072	<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>
				3073
				3074	<pre class="text">
				3075	Polynomial
				3076	Sinusoid
				3077	Arcsin
				3078	Arctan
				3079	</pre>
				3080
				3081	<p>To print a complete list of <a href="#function">-function</a> operators, use <a href="#list">-list function</a>. Descriptions follow.</p>
				3082
				3083	<dl class="doc">
				3084	<dt><kbd>Polynomial</kbd></dt>
				3085	<dd>
				3086	<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>
				3087
				3088	<div style="text-align: center">
				3089	-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>
				3090	</div>
				3091
				3092	<p>will invoke a polynomial function given by</p>
				3093
				3094	<div style="text-align: center">
				3095	<em>a</em><sub><em>n</em></sub> <b><em>u</em></b><sup><em>n</em></sup> +
				3096	<em>a</em><sub><em>n</em>-1</sub> <b><em>u</em></b><sup><em>n</em>-1</sup> +
				3097	··· <em>a</em><sub>1</sub> <b><em>u</em></b> + <em>a</em><sub>0</sub>,
				3098	</div>
				3099
				3100	<p>where <b><em>u</em></b> is pixel's original normalized channel value.</p>
				3101
				3102	<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>
				3103
				3104	<table class="doc">
				3105	<col width="35%" />
				3106	<col width="35%" />
				3107	<col width="30%" />
				3108	<tr>
				3109	<td>-evaluate Set <em class="arg">value</em> </td>
				3110	<td>-function Polynomial <em class="arg">value</em></td>
				3111	<td>(Constant functions; set <em class="arg">value</em>×100% gray when channels are RGB.)</td>
				3112	</tr>
				3113	<tr>
				3114	<td>-evaluate Add <em class="arg">value</em> </td>
				3115	<td>-function Polynomial 1,<em class="arg">value</em></td>
				3116	</tr>
				3117	<tr>
				3118	<td>-evaluate Subtract <em class="arg">value</em> </td>
				3119	<td>-function Polynomial 1,−<em class="arg">value</em></td>
				3120	</tr>
				3121	<tr>
				3122	<td>-evaluate Multiply <em class="arg">value</em> </td>
				3123	<td>-function Polynomial <em class="arg">value</em>,0</td>
				3124	</tr>
				3125	<tr>
				3126	<td>+level black% x white%</td>
				3127	<td>-function Polynomial A,B</td>
				3128	<td>(Reduce contrast. Here, A=(white-black)/100 and B=black/100.)</td>
				3129	</tr>
				3130	</table>
				3131
				3132	<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>
				3133	</dd>
				3134
				3135	<dt><kbd>Sinusoid</kbd></dt>
				3136	<dd>
				3137	<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>
				3138
				3139	<div style="text-align: center">
				3140	-function <kbd>Sinusoid</kbd> <em class="arg">freq</em>,[<em class="arg">phase</em>,[<em class="arg">amp</em>,[<em class="arg">bias</em>]]]
				3141	</div>
				3142
				3143	<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>
				3144
				3145	<div style="text-align: center">
				3146	<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>
				3147	</div>
				3148
				3149	<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>
				3150
				3151	<p class="crtsnip">
				3152	-function Sinusoid 3,-90,.2,.7
				3153	</p>
				3154
				3155	<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>
				3156
				3157	<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>
				3158
				3159	<table class="doc">
				3160	<tr>
				3161	<td>-evaluate Sin <em class="arg">freq</em> </td>
				3162	<td>-function Sinusoid <em class="arg">freq</em>,0 </td>
				3163	</tr>
				3164	<tr>
				3165	<td>-evaluate Cos <em class="arg">freq</em> </td>
				3166	<td>-function Sinusoid <em class="arg">freq</em>,90 </td>
				3167	</tr>
				3168	</table>
				3169	</dd>
				3170
				3171	<dt><kbd>ArcSin</kbd></dt>
				3172	<dd>
				3173	<p>The <kbd>ArcSin</kbd> function generates the inverse curve of a Sinusoid,
				3174	and can be used to generate cylindrical distortion and displacement maps.
				3175	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]	3176	of values.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3177
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3178	<p style="text-align: center">
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3179	-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]	3180	</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3181
				3182	<p>with all values given in terms of noramlize color values (0.0 for black,
				3183	1.0 for white). Defaulting to values covering the full range from 0.0 to 1.0
				3184	for bout input (<em class="arg">width</em>), and output (<em
				3185	class="arg">width</em>) values. '<code>1.0,0.5,1.0,0.5</code>' </p>
				3186
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3187	<p style="text-align: center">
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3188	<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]	3189	</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3190
				3191	</dd>
				3192
				3193	<dt><kbd>ArcTan</kbd></dt>
				3194	<dd>
				3195	<p>The <kbd>ArcTan</kbd> function generates a curve that smooth crosses from
				3196	limit values at infinities, though a center using the given slope value.
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3197	All these values can be adjusted via the arguments.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3198
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3199	<p style="text-align: center">
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3200	-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]	3201	</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3202
				3203	<p>Defaulting to '<code>1.0,0.5,1.0,0.5</code>'.
				3204	</p>
				3205
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3206	<p style="text-align: center">
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3207	<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]	3208	</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3209
				3210	</dd>
				3211
				3212	</dl>
				3213
				3214
				3215	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3216	<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]	3217	</div>
				3218
				3219	<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>
				3220
				3221	<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>
				3222
				3223	<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>
				3224
				3225
				3226	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3227	<h4><a id="fx"></a>-fx <em class="arg">expression</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3228	</div>
				3229
				3230	<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>
				3231
				3232	<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>
				3233
				3234	<p>See <a href="../www/fx.html">FX, The Special Effects Image Operator</a> for a detailed discussion of this option.</p>
				3235
				3236
				3237	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3238	<h4><a id="gamma"></a>-gamma <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3239	</div>
				3240
				3241	<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>
				3242
				3243	<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>
				3244
				3245	<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>
				3246
				3247	<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>
				3248
				3249	<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>
				3250
				3251	<p>Note that gamma adjustments are also available via the <a href="#level">-level</a> operator.</p>
				3252
				3253	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3254	<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]	3255	</div>
				3256
				3257	<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>
				3258
cristy	b15553d	2010-07-03 22:53:14 +0000	[diff] [blame]	3259	<p>Convolve the image with a Gaussian or normal distribution using the given
				3260	<em class="arg" >Sigma</em> value. The formula is:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3261
				3262	<div class="eqn"><img alt="gaussian distribution" width="243px" height="42px" src="../images/gaussian-blur.png"/>
				3263	</div>
				3264
cristy	b15553d	2010-07-03 22:53:14 +0000	[diff] [blame]	3265	<p>The <em class="arg" >Sigma</em> value is the important argument, and
cristy	efb2bdb	2010-11-20 19:35:22 +0000	[diff] [blame]	3266	determines the actual amount of blurring that will take place. </p>
cristy	b15553d	2010-07-03 22:53:14 +0000	[diff] [blame]	3267
				3268	<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]	3269	array which will hold the calculated Gaussian distribution. It should be an
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3270	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]	3271	radius that will provide meaningful results for the Gaussian distribution.
				3272	</p>
				3273
				3274	<p>The larger the <em class="arg" >Radius</em> the radius the slower the
				3275	operation is. However too small a <em class="arg" >Radius</em>, and sever
				3276	aliasing effects may result. As a guideline, <em class="arg" >Radius</em>
				3277	should be at least twice the <em class="arg" >Sigma</em> value, though three
				3278	times will produce a more accurite result. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3279
				3280	<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]	3281	full 2-dimensional convolution is used to generate the weighted average of the
				3282	neighboring pixels. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3283
				3284	<p>The <a href="#virtual-pixel">-virtual-pixel</a> setting will determine how
				3285	pixels which are outside the image proper are blurred into the final result.
				3286	</p>
				3287
				3288
				3289	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3290	<h4><a id="geometry"></a>-geometry <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3291	</div>
				3292
				3293	<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>
				3294
				3295	<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>
				3296
				3297	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3298	<h4><a id="gravity"></a>-gravity <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3299	</div>
				3300
				3301	<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>
				3302
				3303	<p>Choices include: <kbd>NorthWest</kbd>, <kbd>North</kbd>, <kbd>NorthEast</kbd>,
				3304	<kbd>West</kbd>, <kbd>Center</kbd>, <kbd>East</kbd>, <kbd>SouthWest</kbd>,
				3305	<kbd>South</kbd>, <kbd>SouthEast</kbd>. Use <a href="#list">-list gravity</a> to get a complete
				3306	list of <a href="#gravity">-gravity</a> settings available in your ImageMagick
				3307	installation.</p>
				3308
				3309	<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>
				3310
				3311	<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>
				3312
				3313	<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>
				3314
cristy	4949d52	2010-03-12 18:41:34 +0000	[diff] [blame]	3315	<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]	3316	<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>
				3317
				3318	<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>
				3319
				3320
				3321	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3322	<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]	3323	</div>
				3324
				3325	<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>
				3326
				3327
				3328	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3329	<h4><a id="hald-clut"></a>-hald-clut</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3330	</div>
				3331
				3332	<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>
				3333
				3334	<p>A Hald color lookup table is a 3-dimensional color cube mapped to 2
				3335	dimensions. Create it with the <kbd>HALD:</kbd> prefix (e.g. HALD:8). You
				3336	can apply any color transformation to the Hald image and then use this option
				3337	to apply the transform to the image. </p>
				3338
				3339	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert image.png hald.png -hald-clut transform.png</span></p>
				3340	<p>This option provides a convenient method for you to use Gimp or Photoshop
				3341	to make color corrections to the Hald CLUT image and subsequently apply them
				3342	to multiple images using an ImageMagick script. </p>
				3343
				3344	<p>Note that the representation is only of the normal RGB color space and that
				3345	the whole color value triplet is used for the interpolated lookup of the
				3346	represented Hald color cube image. Because of this the operation is not <a
				3347	href="#channel" >-channel</a> setting effected, nor can it adjust or modify an
				3348	images transparency or alpha/matte channel.</p>
				3349
				3350	<p>See also <a href="#clut" >-clut</a> which provides color value replacement
				3351	of the individual color channels, usally involving a simplier gray-scale
				3352	image. E.g: gray-scale to color replacement, or modification by a histogram
				3353	mapping. </p>
				3354
				3355
				3356	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3357	<h4><a id="help"></a>-help</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3358	</div>
				3359
				3360	<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>
				3361
				3362	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3363	<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]	3364	</div>
				3365
				3366	<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>
				3367
				3368	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3369	<h4><a id="iconGeometry"></a>-iconGeometry <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3370	</div>
				3371
				3372	<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>
				3373
				3374	<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>
				3375
				3376	<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>
				3377
				3378	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3379	<h4><a id="iconic"></a>-iconic</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3380	</div>
				3381
				3382	<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>
				3383
				3384	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3385	<h4><a id="identify"></a>-identify</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3386	</div>
				3387
				3388	<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>
				3389
				3390	<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>
				3391
				3392	<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>
				3393
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3394	<p>If <a href="#verbose">-verbose</a> precedes this option, copious
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3395	amounts of image properties are displayed including image statistics, profiles,
				3396	image histogram, and others.</p>
				3397
				3398	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3399	<h4><a id="ift"></a>-ift</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%'>implements the inverse discrete Fourier transform (DFT).</td><td style='text-align:right;'></td></tr></table>
				3403
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3404	<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]	3405
				3406	<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>
				3407
				3408	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert fft_image.miff -ift fft_image_ift.png</span></p>
				3409	<p>or</p>
				3410
				3411	<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>
				3412
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3413	<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]	3414
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3415	<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]	3416
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3417	<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]	3418
				3419	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3420	<h4><a id="immutable"></a>-immutable</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3421	</div>
				3422
				3423	<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>
				3424
				3425	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3426	<h4><a id="implode"></a>-implode <em class="arg">factor</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3427	</div>
				3428
				3429	<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>
				3430
				3431	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3432	<h4><a id="insert"></a>-insert <em class="arg">index</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3433	</div>
				3434
				3435	<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>
				3436
				3437	<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>
				3438
				3439	<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>
				3440
				3441	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3442	<h4><a id="intent"></a>-intent <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3443	</div>
				3444
				3445	<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>
				3446
				3447	<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>
				3448
				3449	<p>The default intent is undefined.</p>
				3450
				3451	<p>To print a complete list of rendering intents, use <a href="#list">-list intent</a>.</p>
				3452
				3453	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3454	<h4><a id="interlace"></a>-interlace <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3455	</div>
				3456
				3457	<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>
				3458
				3459	<p>Choose from:</p>
				3460
				3461	<pre class="text">
				3462	none
				3463	line
				3464	plane
				3465	partition
				3466	JPEG
				3467	GIF
				3468	PNG
				3469	</pre>
				3470
				3471	<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>
				3472
				3473	<p><kbd>None</kbd> means do not interlace (RGBRGBRGBRGBRGBRGB...),</p>
				3474
				3475	<p><kbd>Line</kbd> uses scanline interlacing (RRR...GGG...BBB...RRR...GGG...BBB...), and.</p>
				3476
				3477	<p><kbd>Plane</kbd> uses plane interlacing (RRRRRR...GGGGGG...BBBBBB...).</p>
				3478
				3479	<p><kbd>Partition</kbd> is like plane except the different planes are saved to individual files (e.g. image.R,
				3480	image.G, and image.B).</p>
				3481
				3482	<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>
				3483	image.</p>
				3484
				3485	<p>To print a complete list of interlacing schemes, use <a href="#list">-list interlace</a>.</p>
				3486
				3487	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3488	<h4><a id="interpolate"></a>-interpolate <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3489	</div>
				3490
				3491	<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>
				3492
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3493	<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]	3494	value, you typically fall in between the pixel colors defined by the source
				3495	image. This setting determines how the color is determined from the colors of
				3496	the pixels surrounding that point. That is how to determine the color of a
				3497	point that falls between two, or even four different colored pixels. </p>
				3498
				3499	<pre class="text">
				3500	integer: The color of the top-left pixel (floor function)
				3501	nearest-neighbor: The nearest pixel to the lookup point (rounded function)
				3502	average: The average color of the surrounding four pixels
				3503	bilinear A double linear interpolation of pixels (the default)
				3504	mesh Divide area into two flat triangular interpolations
				3505	bicubic Fitted bicubic-spines of surrounding 16 pixels
				3506	spline Direct spline curves (colors are blurred)
				3507	filter Use resize <a href="#filter">-filter</a> settings
				3508	</pre>
				3509
				3510	<p>This most important for distortion operators such as <a href="#distort"
				3511	>-distort</a>, <a href="#implode" >-implode</a>, <a href="#transform"
				3512	>-transform</a> and <a href="#fx" >-fx</a>. </p>
				3513
				3514	<p>To print a complete list of interpolation methods, use <a href="#list">-list interpolate</a>.</p>
				3515
				3516	<p>See also <a href="#virtual-pixel" >-virtual-pixel</a>, for control of the
				3517	lookup for positions outside the boundaries of the image. </p>
				3518
				3519
				3520	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3521	<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]	3522	</div>
				3523
				3524	<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>
				3525
				3526	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3527	<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]	3528	</div>
				3529
				3530	<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>
				3531
				3532	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3533	<h4><a id="kerning"></a>-kerning <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3534	</div>
				3535
				3536	<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>
				3537
				3538	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3539	<h4><a id="label"></a>-label <em class="arg">name</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3540	</div>
				3541
				3542	<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>
				3543
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	3544	<p>Use this option to assign a specific label to the image, as it is read in
				3545	or created. You can use the <a href="#set" >-set</a> operation to re-assign
				3546	a the labels of images already read in. Image formats such as TIFF, PNG,
				3547	MIFF, supports saving the label information with the image.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3548
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	3549	<p>When saving an image to a <em class="arg">PostScript</em> file, any label
				3550	assigned to an image is used as a header string to print above the postscript
				3551	image. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3552
cristy	bc9539a	2010-08-16 18:06:20 +0000	[diff] [blame]	3553	<p>You can include the image filename, type, width, height, or other image
				3554	attribute by embedding special format character. See <a href="../www/escape.html">Format and Print Image
				3555	Properties</a> for details of the percent escape codes.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3556
				3557	<p>For example,</p>
				3558
				3559	<p class="crtsnip">
				3560	-label "%m:%f %wx%h" bird.miff
				3561	</p>
				3562
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	3563	<p>assigns an image label of <kbd>MIFF:bird.miff 512x480</kbd> to the
				3564	"<kbd>bird.miff</kbd>" image and whose width is 512 and height is 480, as it
				3565	is read in. If a <a href="#label">+label</a> option was used instead, any
				3566	existing label present in the image would be used. You can remove all labels
				3567	from an image by assigning the empty string. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3568
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	3569	<p>A label is not drawn on the image, but is embedded in the image datastream
				3570	via <em>Label</em> tag or similar mechanism. If you want the label to be
				3571	visible on the image itself, use the <a href="#draw">-draw</a> option, or
				3572	during the final processing in the creation of a image montage.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3573
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	3574	<p>If the first character of <em class="arg">string</em> is <em
				3575	class="arg">@</em>, the image label is read from a file titled by the
				3576	remaining characters in the string. Labels in a file are literal, no embedded
				3577	formatting characters are recognized.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3578
				3579
				3580	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3581	<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]	3582	</div>
				3583
				3584	<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>
				3585
				3586	<p>Adaptively threshold each pixel based on the value of pixels in a
				3587	surrounding window. If the current pixel is lighter than this average plus
				3588	the optional <kbd>offset</kbd>, then it is made white, otherwise it is made
				3589	black. Small variations in pixel values such as found in scanned documents
				3590	can be ignored if offset is positive. A negative offset will make it more
				3591	sensitive to those small variations. </p>
				3592
				3593	<p>This is commonly used to threshold images with an uneven background. It is
				3594	based on the assumption that average color of the small window is the
				3595	the local background color, from which to separate the forground color. </p>
				3596
				3597
				3598	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3599	<h4><a id="layers"></a>-layers <em class="arg">method</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3600	</div>
				3601
				3602	<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>
				3603
				3604	<p>Perform various image operation methods to a ordered sequence of images
				3605	which may represent either a set of overlaid 'image layers', a GIF disposal
				3606	animation, or a fully-'coalesced' animation sequence. </p>
				3607
				3608	<table class="doc">
				3609	<tbody>
				3610	<tr valign="top">
				3611	<th align="left" style="width: 8%">Method</th>
				3612	<th align="left">Description</th>
				3613	</tr>
				3614
				3615	<tr valign="top">
				3616	<td valign="top">compare-any</td>
				3617	<td valign="top">Crop the second and later frames to the smallest rectangle
				3618	that contains all the differences between the two images. No GIF <a
				3619	href="#dispose" >-dispose</a> methods are taken into account. </td>
				3620	</tr>
				3621
				3622	<tr><td></td><td>This exactly the same as the <a href="#deconstruct"
				3623	>-deconstruct</a> operator, and does not preserve animations normal
				3624	working, especially when animation used layer disposal methods such as
				3625	'<kbd>Previous</kbd>' or '<kbd>Background</kbd>'. </td>
				3626	</tr>
				3627
				3628	<tr valign="top">
				3629	<td valign="top">compare-clear</td>
				3630	<td valign="top">As '<kbd>compare-any</kbd>' but crop to the bounds of any
				3631	opaque pixels which become transparent in the second frame. That is the
				3632	smallest image needed to mask or erase pixels for the next frame. </td>
				3633	</tr>
				3634
				3635	<tr valign="top">
				3636	<td valign="top">compare-overlay</td>
				3637	<td valign="top">As '<kbd>compare-any</kbd>' but crop to pixels that add
				3638	extra color to the next image, as a result of overlaying color pixels.
				3639	That is the smallest single overlaid image to add or change colors. </td>
				3640	</tr>
				3641
				3642	<tr><td></td><td>This can be used with the <a href="#compose" >-compose</a> alpha
				3643	composition method '<kbd>change-mask</kbd>', to reduce the image to
				3644	just the pixels that need to be overlaid. </td>
				3645	</tr>
				3646
				3647	<tr valign="top">
				3648	<td valign="top">coalesce</td>
				3649	<td valign="top">Equivalent to a call to the <a href="#coalesce"
				3650	>-coalesce</a> operator. Apply the layer disposal methods set in the
				3651	current image sequence to form a fully defined animation sequence, as
				3652	it should be displayed. Effectively converting a GIF animation into a
				3653	'film strip'-like animation. </td>
				3654	</tr>
				3655
				3656	<tr valign="top">
				3657	<td valign="top">composite</td>
				3658	<td valign="top">Alpha Composition of two image lists, separated by a
				3659	"<kbd>null:</kbd>" image, with the destination image list first, and
				3660	the source images last. An image from each list are composited
				3661	together until one list is finished. The separator image and source
				3662	image lists are removed. </td>
				3663	</tr>
				3664
				3665
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	3666	<tr><td></td>
				3667	<td>The <a href="#geometry" >-geometry</a> offset is adjusted according
				3668	to <a href="#gravity" >-gravity</a> in accordance of the virtual
				3669	canvas size of the first image in each list. Unlike a normal <a
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3670	href="#composite" >-composite</a> operation, the canvas offset is also
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	3671	added to the final composite positioning of each image. </td> </tr>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3672
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	3673	<tr><td></td>
				3674	<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]	3675	applied to all the images in the other image list, regardless of which
				3676	list it is. In this case it is the image meta-data of the list which
				3677	preserved. </td>
				3678	</tr>
				3679
				3680
				3681	<tr valign="top">
				3682	<td valign="top">dispose</td>
				3683	<td valign="top">This like '<kbd>coalesce</kbd>' but shows the look of
				3684	the animation after the layer disposal method has been applied, before
				3685	the next sub-frame image is overlaid. That is the 'dispose' image that
				3686	results from the application of the GIF <a href="#dispose"
				3687	>-dispose</a> method. This allows you to check what
				3688	is going wrong with a particular animation you may be developing.
				3689	</td>
				3690	</tr>
				3691
				3692	<tr valign="top">
				3693	<td valign="top">flatten</td>
				3694	<td valign="top">Create a canvas the size of the first images virtual
				3695	canvas using the current <a href="#background" >-background</a> color,
				3696	and <a href="#compose" >-compose</a> each image in turn onto that
				3697	canvas. Images falling outside that canvas is clipped. Final
				3698	image will have a zero virtual canvas offset. </td>
				3699	</tr>
				3700
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	3701	<tr><td></td>
				3702	<td>This usally used as one of the final 'image layering' operations
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3703	overlaying all the prepared image layers into a final image. </td>
				3704	</tr>
				3705
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	3706	<tr><td></td>
				3707	<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]	3708	canvas with real pixels, or to underlay a opaque color to remove
				3709	transparency from an image.</td>
				3710	</tr>
				3711
				3712
				3713	<tr valign="top">
				3714	<td valign="top">merge</td>
				3715	<td valign="top">As 'flatten' method but merging all the given image
				3716	layers into a new layer image just large enough to hold all the image
				3717	without clipping or extra space. The new images virtual offset will
				3718	prevere the position of the new layer, even if this offset is
				3719	negative. the virtual canvas size of the first image is preserved.
				3720	</td>
				3721	</tr>
				3722
				3723	<tr><td></td><td>Caution is advised when handling image layers with negative offsets
				3724	as few image file formats handle them correctly. </td>
				3725	</tr>
				3726
				3727	<tr valign="top">
				3728	<td valign="top">mosaic</td>
				3729	<td valign="top">As 'flatten' method but expanding the initial canvas size
				3730	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]	3731	virtual canvas is 'locked' to the origin, by definition, image layers
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3732	with a negative offsets will still be clipped by the top and left
				3733	edges.</td>
				3734	</tr>
				3735
				3736	<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]	3737	offset but without knowing the final canvas size. The resulting image
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3738	will, like 'flatten' not have any virtual offset, so can be saved to
				3739	any image file format. </td>
				3740	</tr>
				3741
				3742
				3743	<tr valign="top">
				3744	<td valign="top">optimize</td>
				3745	<td valign="top">Optimize a coalesced animation, into GIF animation using
				3746	a number of general techniques. This currently a short cut to
				3747	apply both the '<kbd>optimize-frame</kbd>', and
				3748	'<kbd>optimize-transparency</kbd>' methods but may be expanded to
				3749	include other optimization methods as they are developed. </td>
				3750	</tr>
				3751
				3752	<tr valign="top">
				3753	<td valign="top">optimize-frame</td>
				3754	<td valign="top">Optimize a coalesced animation, into GIF animation by
				3755	reducing the number of pixels per frame as much as possible by
				3756	attempting to pick the best layer disposal method to use, while ensuring
				3757	the result will continue to animate properly. </td>
				3758	</tr>
				3759
				3760	<tr><td></td><td> There is no guarantee that the best optimization is found. But
				3761	then no reasonably fast GIF optimization algorithm can do this.
				3762	However this does seem to do better than most other GIF frame
				3763	optimizers seen. </td>
				3764	</tr>
				3765
				3766	<tr valign="top">
				3767	<td valign="top">optimize-plus</td>
				3768	<td valign="top">As '<kbd>optimize-frame</kbd>' but attempt to improve the
				3769	overall optimization by adding extra frames to the animation, without
				3770	changing the final look or timing of the animation. The frames are
				3771	added to attempt to separate the clearing of pixels from the
				3772	overlaying of new additional pixels from one animation frame to the
				3773	next. If this does not improve the optimization (for the next frame
				3774	only), it will fall back to the results of the previous normal
				3775	'<kbd>optimize-frame</kbd>' technique. </td>
				3776	</tr>
				3777
				3778	<tr><td></td><td>There is the possibility that the change in the disposal style will
				3779	result in a worsening in the optimization of later frames, though this
				3780	is unlikely. In other words there no guarantee that it is better than
				3781	the normal '<kbd>optimize-frame</kbd>' technique. For some animations
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3782	however you can get a vast improvement in the final animation size. </td>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3783	</tr>
				3784
				3785	<tr valign="top">
				3786	<td valign="top">optimize-transparency</td>
				3787	<td valign="top">Given a GIF animation, replace any pixel in the sub-frame
				3788	overlay images with transparency, if it does not change the resulting
				3789	animation by more than the current <a href="#fuzz" >-fuzz</a> factor.
				3790	</td>
				3791	</tr>
				3792
				3793	<tr><td></td><td>This should allow a existing frame optimized GIF animation to compress
				3794	into a smaller file size due to larger areas of one (transparent)
				3795	color rather than a pattern of multiple colors repeating the current
				3796	disposed image of the last frame. </td>
				3797	</tr>
				3798
				3799	<tr valign="top">
				3800	<td valign="top">remove-dups</td>
				3801	<td valign="top">Remove (and merge time delays) of duplicate consecutive
				3802	images, so as to simplify layer overlays of coalesced animations.
				3803	</td>
				3804	</tr>
				3805
				3806	<tr><td></td><td>Usually this a result of using a constant time delay across the
				3807	whole animation, or after a larger animation was split into smaller
				3808	sub-animations. The duplicate frames could also have been used as
				3809	part of some frame optimization methods. </td>
				3810	</tr>
				3811
				3812	<tr valign="top">
				3813	<td valign="top">remove-zero</td>
				3814	<td valign="top">Remove any image with a zero time delay, unless ALL the
				3815	images have a zero time delay (and is not a proper timed animation, a
				3816	warning is then issued). </td>
				3817	</tr>
				3818
				3819	<tr><td></td><td>In a GIF animation, such images are usually frames which provide
				3820	partial intermediary updates between the frames that are actually
				3821	displayed to users. These frames are usally added for improved frame
				3822	optimization in GIF animations. </td>
				3823	</tr>
				3824
				3825	<tr valign="top">
				3826	<td valign="top">trim-bounds</td>
				3827	<td valign="top">Find the bounds of all the images in the current
				3828	image sequence, then adjust the offsets so all images are contained on
				3829	a minimal positive canvas. None of the image data is modified, only
				3830	there virtual canvas size and offset. The all the image is given
				3831	the same canvas size, and and will have a positive offset, but will
				3832	remain in the same position relative to each other. As a result of the
				3833	minimal canvas size at least one image will touch every edge of that
				3834	canvas. The image data however may be transparent.
				3835	</td>
				3836	</tr>
				3837
				3838	</tbody>
				3839	</table>
				3840
				3841	<p>To print a complete list of layer types, use <a href="#list">-list layers</a>.</p>
				3842
				3843	<p>The operators <a href="#coalesce" >-coalesce</a>, <a href="#deconstruct"
				3844	>-deconstruct</a>, <a href="#flatten" >-flatten</a>, and <a href="#mosaic"
				3845	>-mosaic</a> are only aliases for the above methods. Also see <a
				3846	href="#page" >-page</a>, <a href="#repage" >-repage</a> operators, the <a
				3847	href="#compose" >-compose</a> setting, and the GIF <a href="#dispose"
				3848	>-dispose</a> and <a href="#delay" >-delay</a> settings. </p>
				3849
				3850
				3851	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3852	<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]	3853	</div>
				3854
				3855	<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>
				3856
				3857	<p>Given one, two or three values delimited with commas: black-point,
				3858	white-point, gamma (for example: 10,250,1.0 or 2%,98%,0.5). The black and
				3859	white points range from 0 to <em class="QR">QuantumRange</em>, or from 0 to 100%; if the white
				3860	point is omitted it is set to (<em class="QR">QuantumRange</em> - black_point), so as to center
				3861	contrast changes. If a <kbd>%</kbd> sign is present anywhere in the string,
				3862	both black and white points are percentages of the full color range. Gamma
				3863	will do a <a href="#gamma">-gamma</a> adjustment of the values. If it is
				3864	omitted, the default of 1.0 (no gamma correction) is assumed.</p>
				3865
				3866	<p>In normal usage (<kbd>-level</kbd>) the image values are stretched so that
				3867	the given '<kbd>black_point</kbd>' value in the original image is set to
				3868	zero (or black), while the given '<kbd>white_point</kbd>' value is set to
				3869	<em class="QR">QuantumRange</em> (or white). This provides you with direct contrast adjustments
				3870	to the image. The '<kbd>gamma</kbd>' of the resulting image will then be
				3871	adjusted. </p>
				3872
				3873	<p>From ImageMagick v6.4.1-9 using the plus form of the operator (<kbd>+level</kbd>) or
				3874	adding the special '!' flag anywhere in the argument list, will cause the
				3875	operator to do the reverse of the level adjustment. That is a zero, or
				3876	<em class="QR">QuantumRange</em> value (black, and white, resp.) in the original image, is
				3877	adjusted to the given level values, allowing you to de-contrast, or compress
				3878	the channel values within the image. The '<kbd>gamma</kbd>' is adjusted before the level adjustment to de-contrast the image is made. </p>
				3879
				3880	<p>Only the channels defined by the current <a href="#channel">-channel</a>
				3881	setting are adjusted (defaults to RGB color channels only), allowing you to
				3882	limit the effect of this operator. </p>
				3883
				3884	<p>Please note that the transparency channel is treated as 'matte'
				3885	values (0 is opaque) and not as 'alpha' values (0 is transparent).</p>
				3886
				3887
				3888	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3889	<h4><a id="level-colors"></a>-level-colors {<em
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3890	class="arg">black_color</em>}{,}{<em class="arg">white_color</em>}</h4>
				3891	</div>
				3892
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3893	<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]	3894
				3895	<p>This function is exactly like <a href="#level">-level</a>, except that the
				3896	value value for each color channel is determined by the
				3897	'<kbd>black_color</kbd>' and '<kbd>white_color</kbd>' colors given (as
				3898	described under the <a href="#fill">-fill</a> option). </p>
				3899
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3900	<p>This effectually means the colors provided to <kbd>-level-colors</kbd>
				3901	is mapped to become 'black' and 'white' respectively, with all the other
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3902	colors linearly adjusted (or clipped) to match that change. Each channel is
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3903	adjusted separately using the channel values of the colors specified. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3904
				3905	<p>On the other hand the plus form of the operator (<kbd>+level-colors</kbd>)
				3906	will map the image color 'black' and 'white' to the given colors
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3907	respectively, resulting in a gradient (de-contrasting) tint of the image to
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3908	those colors. This can also be used to convert a plain gray-scale image into a
				3909	one using the gradient of colors specified. </p>
				3910
				3911	<p>By supplying a single color with a comma separator either before or after
				3912	that color, will just replace the respective 'black' or 'white' point
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3913	respectively. But if no comma separator is provided, the given color is
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3914	used for both the black and white color points, making the operator either
				3915	threshold the images around that color (- form) or set all colors to that
				3916	color (+ form). </p>
				3917
				3918
				3919	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3920	<h4><a id="limit"></a>-limit <em class="arg">type value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3921	</div>
				3922
				3923	<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>
				3924
				3925	<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>
				3926
cristy	6b63665	2009-12-05 17:16:11 +0000	[diff] [blame]	3927	<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]	3928
				3929	<p class="crtsnip">
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	3930	-limit memory 32MiB -limit map 64MiB
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3931	</p>
				3932
				3933	<p>Use <a href="#list">-list resource</a> to list the current limits. For example, our system shows these limits:</p>
				3934
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3935	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>identify -list resource</span><span class='crtout'></span></p><pre class="text">
				3936	File Area Memory Map Disk Thread Time
cristy	6b63665	2009-12-05 17:16:11 +0000	[diff] [blame]	3937	------------------------------------------------------------------------------
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3938	768 12.404GB 8.6642GiB 23.104GiB 18.446744EB 8 unlimited
				3939	</pre>
				3940
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3941	<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>
				3942
				3943	<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>
				3944
				3945	<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>
				3946
				3947	<p class="crtsnip">
				3948	-limit area 10mb
				3949	</p>
				3950
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	3951	<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]	3952
				3953	<p class="crtsnip">
				3954	-limit area 10mb -limit disk 500mb
				3955	</p>
				3956
				3957	<p>Here ImageMagick stops processing if an image requires more than 500MB of disk storage.</p>
				3958
				3959	<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>
				3960
				3961	<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.
				3962	</p>
				3963
				3964	<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.
				3965	</p>
				3966
				3967	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3968	<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]	3969	</div>
				3970
				3971	<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>
				3972
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	3973	<p>This is very similar to <a href="#contrast-stretch" >-contrast-stretch</a>,
				3974	and uses a 'histogram bin' to determine the range of color values that needs to
				3975	be stretched. However it then stretchs those colors using the <a
				3976	href="#level" >-level</a> operator.</p>
				3977
				3978	<p>As such while the initial determination may have 'binning' round off
				3979	effects, the image colors are stretched mathematically, rather than using the
				3980	histogram bins. This makes the operator more accurate. </p>
				3981
				3982	<p>note however that a <a href="#linear-stretch" >-linear-stretch</a> of
				3983	'<kbd>0</kbd>' does nothing, while a value of '<kbd>1</kbd>' does a near
				3984	perfect stretch of the color range. </p>
				3985
				3986	<p>See also <a href="#auto-level" >-auto-level</a> for a 'perfect'
				3987	normalization of mathematical images. </p>
				3988
				3989	<p>This operator is under review for re-development. </p>
				3990
				3991
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3992	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3993	<h4><a id="linewidth"></a>-linewidth</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	3994	</div>
				3995
				3996	<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>
				3997
				3998	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	3999	<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]	4000	</div>
				4001
				4002	<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>
				4003
				4004	<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>
				4005
				4006	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4007	<h4><a id="list"></a>-list <em class="arg">type</em></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%'>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>
				4011
				4012	<pre class="text">
cristy	c1aee83	2010-05-08 00:36:47 +0000	[diff] [blame]	4013	Align
				4014	Alpha
				4015	Boolean
				4016	Channel
				4017	Class
				4018	ClipPath
				4019	Coder
				4020	Color
				4021	Colorspace
				4022	Command
				4023	Compose
				4024	Compress
				4025	Configure
				4026	DataType
				4027	Debug
				4028	Decoration
				4029	Delegate
				4030	Direction
				4031	Dispose
				4032	Distort
				4033	Dither
				4034	Endian
				4035	Evaluate
				4036	FillRule
				4037	Filter
				4038	Font
				4039	Format
				4040	Function
				4041	Gravity
				4042	ImageList
				4043	Intent
				4044	Interlace
				4045	Interpolate
				4046	Kernel
cristy	787d435	2010-03-06 13:55:58 +0000	[diff] [blame]	4047	Layers
				4048	LineCap
				4049	LineJoin
				4050	List
				4051	Locale
				4052	LogEvent
				4053	Log
				4054	Magic
				4055	Method
				4056	Metric
				4057	Mime
				4058	Mode
				4059	Morphology
				4060	Module
				4061	Noise
				4062	Orientation
				4063	Policy
				4064	PolicyDomain
				4065	PolicyRights
				4066	Preview
				4067	Primitive
				4068	QuantumFormat
				4069	Resource
				4070	SparseColor
				4071	Storage
				4072	Stretch
				4073	Style
				4074	Threshold
				4075	Type
				4076	Units
				4077	Validate
				4078	VirtualPixel
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4079	</pre>
				4080
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4081	<p>These lists vary depending on your version of ImageMagick. Use "<kbd>-list
				4082	list</kbd>" to get a complete listing of all the "<kbd>-list</kbd>" arguments
				4083	available:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4084
				4085	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>identify -list list</span></p>
				4086	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4087	<h4><a id="log"></a>-log <em class="arg">string</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4088	</div>
				4089
				4090	<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>
				4091
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4092	<p>This option specifies the format for the log printed when the <a
				4093	href="#debug">-debug</a> option is active.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4094
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4095	<p>You can display the following components by embedding special format
				4096	characters:</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4097
				4098	<pre class="text">
				4099	%d domain
				4100	%e event
				4101	%f function
				4102	%l line
				4103	%m module
				4104	%p process ID
				4105	%r real CPU time
				4106	%t wall clock time
				4107	%u user CPU time
				4108	%% percent sign
				4109	\n newline
				4110	\r carriage return
				4111	</pre>
				4112
				4113	<p>For example:</p>
				4114
				4115	<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>
				4116	<p>The default behavior is to print all of the components.</p>
				4117
				4118	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4119	<h4><a id="loop"></a>-loop <em class="arg">iterations</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4120	</div>
				4121
				4122	<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>
				4123
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4124	<p>Set iterations to zero to repeat the animation an infinite number of times,
				4125	otherwise the animation repeats itself up to <em class="arg">iterations</em>
				4126	times.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4127
				4128	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4129	<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]	4130	</div>
				4131
				4132	<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>
				4133
				4134	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4135	<h4><a id="magnify"></a>-magnify <em class="arg">factor</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4136	</div>
				4137
				4138	<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>
				4139
				4140
				4141	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4142	<h4><a id="map"></a>-map <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4143	</div>
				4144
				4145	<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>
				4146
				4147	<p>Choose from these <em class="arg">Standard Colormap</em> types:</p>
				4148
				4149	<pre class="text">
				4150	best
				4151	default
				4152	gray
				4153	red
				4154	green
				4155	blue
				4156	</pre>
				4157
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4158	<p>The <em class="arg">X server</em> must support the <em class="arg">Standard
				4159	Colormap</em> you choose, otherwise an error occurs. Use <kbd>list</kbd> as
				4160	the type and <kbd>display</kbd> searches the list of colormap types in
				4161	<kbd>top-to-bottom</kbd> order until one is located. See <em
				4162	class="arg">xstdcmap(1)</em> for one way of creating Standard Colormaps.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4163
				4164
				4165	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4166	<h4><a id="map_stream_"></a>-map <em class="arg">components</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4167	</div>
				4168
				4169	<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>
				4170
				4171	<p>Here are the valid components of a map:</p>
				4172
				4173	<pre class="text">
				4174	r red pixel component
				4175	g green pixel component
				4176	b blue pixel component
				4177	a alpha pixel component (0 is transparent)
				4178	o opacity pixel component (0 is opaque)
				4179	i grayscale intensity pixel component
				4180	c cyan pixel component
				4181	m magenta pixel component
				4182	y yellow pixel component
				4183	k black pixel component
				4184	p pad component (always 0)
				4185	</pre>
				4186
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4187	<p>You can specify as many of these components as needed in any order (e.g.
				4188	bgr). The components can repeat as well (e.g. rgbr).</p>
				4189
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4190
				4191	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4192	<h4><a id="mask"></a>-mask
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4193	<em class="arg">filename</em></h4>
				4194	</div>
				4195
				4196	<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>
				4197
				4198	<p>Use <a href="#mask">+mask</a> to remove the image mask.</p>
				4199
				4200	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4201	<h4><a id="mattecolor"></a>-mattecolor <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4202	</div>
				4203
				4204	<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>
				4205
				4206	<p>The color is specified using the format described under the <a href="#fill">-fill</a> option.</p>
				4207
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4208	<p>The default matte color is <kbd>#BDBDBD</kbd>, <span
				4209	style="background-color: #bdbdbd;">this shade of gray</span>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4210
				4211	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4212	<h4><a id="maximum"></a>-maximum</h4>
cristy	d2baf7d	2010-03-06 04:26:44 +0000	[diff] [blame]	4213	</div>
				4214
				4215	<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>
				4216
				4217	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4218	<h4><a id="median"></a>-median <em class="arg">radius</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4219	</div>
				4220
				4221	<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>
				4222
				4223	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4224	<h4><a id="metric"></a>-metric <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4225	</div>
				4226
				4227	<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>
				4228
				4229	<p>Choose from:</p>
				4230
				4231	<pre class="text">
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4232	AE absolute error count, number of different pixels (-fuzz effected)
cristy	a20e3f9	2010-12-13 01:52:32 +0000	[diff] [blame]	4233	FUZZ mean color distance
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4234	MAE mean absolute error (normalized), average channel error distance
				4235	MEPP mean error per pixel (normalized mean error, normalized peak error)
				4236	MSE mean error squared, average of the channel error squared
cristy	a20e3f9	2010-12-13 01:52:32 +0000	[diff] [blame]	4237	NCC normalized cross correlation
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4238	PAE peak absolute (normalize peak absolute)
				4239	PSNR peak signal to noise ratio
				4240	RMSE root mean squared (normalized root mean squared)
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4241	</pre>
				4242
cristy	771f7a7	2010-11-27 21:42:59 +0000	[diff] [blame]	4243	<p>Control the '<kbd>AE</kbd>', or absolute count of pixels that are different,
				4244	with the <a href="#fuzz" >-fuzz</a> factor (ignore pixels which
				4245	only changed by a small amount). Use '<kbd>PAE</kbd>' to find the
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4246	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]	4247	'similar', while '<kbd>MAE</kbd>' dtermines the factor needed
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4248	for about half the pixels to be similar. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4249
				4250	<p>The '<kbd>MEPP</kbd>' metric returns three different metrics
				4251	('<kbd>MAE</kbd>', '<kbd>MAE</kbd>' normalized, and '<kbd>PAE</kbd>'
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	4252	normalized) from a single comparison run. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4253
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4254	<p>To print a complete list of metrics, use the <a href="#list">-list
				4255	metrics</a> option.</p>
				4256
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4257
cristy	d2baf7d	2010-03-06 04:26:44 +0000	[diff] [blame]	4258	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4259	<h4><a id="minimum"></a>-minimum</h4>
cristy	d2baf7d	2010-03-06 04:26:44 +0000	[diff] [blame]	4260	</div>
				4261
				4262	<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>
				4263
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4264
				4265	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4266	<h4><a id="mode"></a>-mode <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4267	</div>
				4268
				4269	<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>
				4270
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4271	<p>Choose the <em class="arg">value</em> from these styles: <kbd>Frame,
				4272	Unframe, or Concatenate</kbd></p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4273
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4274	<p>Use the <a href="#list" >-list</a> option with a '<kbd>Mode</kbd>' argument
				4275	for a list of <a href="#mode" >-mode</a> arguments available in your
				4276	ImageMagick installation.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4277
				4278
				4279	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4280	<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]	4281	</div>
				4282
cristy	bac7a16	2010-06-15 19:57:29 +0000	[diff] [blame]	4283	<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
				4284	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]	4285
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4286	<p>The arguments are given as a percentages of variation. A value of 100 means
				4287	no change, and any missing values are taken to mean 100.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4288
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4289	<p>The <em class="arg">brightness</em> is a multiplier of the overall
				4290	brightness of the image, so 0 means pure black, 50 is half as bright, 200 is
				4291	twice as bright. To invert its meaning <a href="#negate">-negate</a> the image
				4292	before and after. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4293
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4294	<p>The <em class="arg">saturation</em> controls the amount of color in an
				4295	image. For example, 0 produce a grayscale image, while a large value such as
				4296	200 produce a very colorful, 'cartoonish' color.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4297
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4298	<p>The <em class="arg">hue</em> argument causes a "rotation" of the colors
				4299	within the image by the amount specified. For example, 50 results in
				4300	a counter-clockwise rotation of 90, mapping red shades to purple, and so on.
				4301	A value of either 0 or 200 results in a complete 180 degree rotation of the
				4302	image. Using a value of 300 is a 360 degree rotation resulting in no change to
				4303	the original image. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4304
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4305	<p>For example, to increase the color brightness by 20% and decrease the color
				4306	saturation by 10% and leave the hue unchanged, use <a
				4307	href="#modulate">-modulate 120,90</a>.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4308
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4309	<p>Use <a href="#set">-set</a> attribute of '<kbd
				4310	class="arg">option:modulate:colorspace</kbd>' to specify which colorspace to
				4311	modulate. Choose from <kbd>HSB</kbd>, <kbd>HSL</kbd> (the default), or
				4312	<kbd>HWB</kbd>. For example,</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4313
				4314	<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]	4315
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4316	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4317	<h4><a id="monitor"></a>-monitor</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4318	</div>
				4319
				4320	<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>
				4321
				4322
				4323	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4324	<h4><a id="monochrome"></a>-monochrome</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4325	</div>
				4326
				4327	<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>
				4328
				4329
				4330	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4331	<h4><a id="morph"></a>-morph <em class="arg">frames</em></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%'>morphs an image sequence.</td><td style='text-align:right;'></td></tr></table>
				4335
				4336	<p>Both the image pixels and size are linearly interpolated to give the
				4337	appearance of a meta-morphosis from one image to the next, over all the images
				4338	in the current image list. The added images are the equivalent of a <a
				4339	href="#blend">-blend</a> composition. The <em class="arg">frames</em>
				4340	argument determine how many images to interpolate between each image. </p>
				4341
				4342
				4343	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4344	<h4><a id="morphology"></a>-morphology</h4>
				4345	<h4>-morphology <em class="arg">method</em> <em class="arg">kernel</em></h4>
cristy	488844c	2010-01-22 14:02:05 +0000	[diff] [blame]	4346	</div>
				4347
cristy	2c83960	2010-04-03 02:32:08 +0000	[diff] [blame]	4348	<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]	4349
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4350	<p>Until I get around to writing a option summary for this, see <a
				4351	href="http://www.imagemagick.org/Usage/morphology/" >IM Usage Examples,
				4352	Morphology</a>. </p>
cristy	83a272e	2010-05-07 20:40:35 +0000	[diff] [blame]	4353
				4354
cristy	488844c	2010-01-22 14:02:05 +0000	[diff] [blame]	4355	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4356	<h4><a id="mosaic"></a>-mosaic</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4357	</div>
				4358
				4359	<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>
				4360
				4361
				4362	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4363	<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]	4364	</div>
				4365
				4366	<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>
				4367
				4368	<p>Blur with the given radius, standard deviation (sigma), and angle. The
				4369	angle given is the angle toward which the image is blurred. That is the
				4370	direction people would consider the object is coming from. </p>
				4371
				4372	<p>Note that the blur is not uniform distribution, giving the motion a
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	4373	definite sense of direction of movement. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4374
				4375	<p>The <a href="#virtual-pixel">-virtual-pixel</a> setting will determine how
				4376	pixels which are outside the image proper are blurred into the final result.
				4377	</p>
				4378
				4379	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4380	<h4><a id="name"></a>-name</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4381	</div>
				4382
				4383	<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>
				4384	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4385	<h4><a id="negate"></a>-negate</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4386	</div>
				4387
cristy	b29bc03	2010-02-01 20:29:43 +0000	[diff] [blame]	4388	<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]	4389
				4390	<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>
				4391
				4392	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4393	<h4><a id="noise"></a>-noise <em class="arg">radius</em><br/>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4394	+noise <em class="arg">type</em></h4>
				4395	</div>
				4396
				4397	<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>
				4398
				4399	<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>
				4400
				4401	<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>
				4402
				4403	<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>
				4404
				4405	<pre class="text">
				4406	Gaussian
				4407	Impulse
				4408	Laplacian
				4409	Multiplicative
				4410	Poisson
				4411	Random
				4412	Uniform
				4413	</pre>
				4414
				4415	<p>To print a complete list of noises, use the <a href="#list">-list noise</a> option.</p>
				4416
cristy	8354396	2009-10-16 19:04:28 +0000	[diff] [blame]	4417	<p>Also see the <a href="#evaluate">-evaluate</a> noise functions that allos
				4418	the use of a controlling value to specify teh amount of noise that should be
				4419	added to an image. </p>
				4420
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4421
				4422	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4423	<h4><a id="normalize"></a>-normalize</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4424	</div>
				4425
				4426	<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>
				4427
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4428	<p>The intensity values are stretched to cover the entire range of possible
				4429	values. While doing so, black-out at most <em>2%</em> of the pixels and
				4430	white-out at most <em>1%</em> of the pixels.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4431
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4432	<p>Note that as of ImageMagick 6.4.7-0, <a href="#normalize" >-normalize</a>
				4433	is equivalent to <a href="#contrast-stretch" >-contrast-stretch 2%x1%</a>.
				4434	(Before this version, it was equivalent to <a href="#contrast-stretch"
				4435	>-contrast-stretch 2%x99%</a>).</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4436
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4437	<p>All the channels are normalized in concert by the came amount so as to
				4438	preserve color integrity, when the default <a href="#channel" >+channel</a>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	4439	setting is in use. Specifying any other <a href="#channel" >-channel</a>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4440	setting will normalize the RGB channels independently.</p>
				4441
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4442	<p>See <a href="#contrast-stretch" >-contrast-stretch</a> for more details.
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4443	Also see <a href="#auto-level" >-auto-level</a> for a 'perfect' normalization
cristy	8354396	2009-10-16 19:04:28 +0000	[diff] [blame]	4444	that is better suited to mathematically generated images. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4445
				4446	<p>This operator is under review for re-development. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4447
				4448
				4449	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4450	<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]	4451	</div>
				4452
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4453	<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
				4454	class="arg">threshold map</em> specified, and a uniform color map with the
				4455	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]	4456
				4457	<p>You can choose from these standard threshold maps:</p>
				4458
				4459	<pre class="text">
cristy	a6d7cf7	2010-11-07 15:58:34 +0000	[diff] [blame]	4460	threshold 1x1 Threshold 1x1 (non-dither)
				4461	checks 2x1 Checkerboard 2x1 (dither)
				4462	o2x2 2x2 Ordered 2x2 (dispersed)
				4463	o3x3 3x3 Ordered 3x3 (dispersed)
				4464	o4x4 4x4 Ordered 4x4 (dispersed)
				4465	o8x8 8x8 Ordered 8x8 (dispersed)
				4466	h4x4a 4x1 Halftone 4x4 (angled)
				4467	h6x6a 6x1 Halftone 6x6 (angled)
				4468	h8x8a 8x1 Halftone 8x8 (angled)
				4469	h4x4o Halftone 4x4 (orthogonal)
				4470	h6x6o Halftone 6x6 (orthogonal)
				4471	h8x8o Halftone 8x8 (orthogonal)
				4472	h16x16o Halftone 16x16 (orthogonal)
				4473	c5x5b c5x5 Circles 5x5 (black)
				4474	c5x5w Circles 5x5 (white)
				4475	c6x6b c6x6 Circles 6x6 (black)
				4476	c6x6w Circles 6x6 (white)
				4477	c7x7b c7x7 Circles 7x7 (black)
				4478	c7x7w Circles 7x7 (white)
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4479	</pre>
				4480
cristy	de36899	2010-11-05 14:32:14 +0000	[diff] [blame]	4481	<p> The <kbd>checks</kbd> pattern produces a 3 level checkerbord dither
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4482	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]	4483	personal or system <kbd>thresholds.xml</kbd> XML file. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4484
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4485	<p>To print a complete list of threshold, use the <a href="#list" >-list
				4486	threshold</a> option.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4487
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4488	<p>It is recommended that the <a href="#map" >+map</a> operator be used after
				4489	applying <a href="#ordered-dither" >-ordered-dither</a> to reduce the number of
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4490	colors an animated image sequence, to less that 256 colors. This ensures that
				4491	a common or global color table is used when saving the result to a color
				4492	limited file format such as GIF. </p>
				4493
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4494	<p>Note that at this time the exact same threshold dithering map is used for
				4495	all color channels, no attempt is made to offset or rotate the map for
				4496	different channels is made, to create an offset printing effect. (possible
				4497	future expansion) </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4498
				4499
				4500	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4501	<h4><a id="opaque"></a>-opaque <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4502	</div>
				4503
				4504	<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>
				4505
cristy	c54f5d4	2009-11-27 21:36:31 +0000	[diff] [blame]	4506	<p>The <em class="arg">color</em> argument is defined using the format
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4507	described under the <a href="#fill" >-fill</a> option. The <a href="#fuzz"
				4508	>-fuzz</a> setting can be used to match and replace colors similar to the one
				4509	given.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4510
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4511	<p>Use <a href="#opaque">+opaque</a> to paint any pixel that does not match
				4512	the target color. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4513
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	4514	<p>The <a href="#transparent">-transparent</a> operator is exactly the same
				4515	as <a href="#opaque" >-opaque</a> but replaces the matching color with
				4516	transparency rather than the current <a href="#fill">-fill</a> color setting.
				4517	To ensure that it can do this it also ensures that the image has an alpha
				4518	channel enabled, as per "<kbd><a href="#alpha" >-alpha</a> set</kbd>", for
				4519	the new transparent colors, and does not require you to modify the <a
				4520	href="#channel">-channel</a> to enable alpha channel handling. </p>
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4521
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4522
				4523	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4524	<h4><a id="orient"></a>-orient <em class="arg">image orientation</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4525	</div>
				4526
				4527	<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>
				4528
				4529	<p>Choose from these orientations:</p>
				4530
				4531	<pre class="text">
				4532	bottom-left
				4533	bottom-right
				4534	left-bottom
				4535	left-top
				4536	right-bottom
				4537	right-top
				4538	top-left
				4539	top-right
				4540	undefined
				4541	</pre>
				4542
cristy	d934d10	2009-10-10 12:55:13 +0000	[diff] [blame]	4543	<p>To print a complete list of orientations, use the <a href="#list" >-list
				4544	orientation</a> option.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4545
				4546
				4547	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4548	<h4><a id="page"></a>-page <em class="arg">geometry</em><br/>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4549	-page <em class="arg">media</em>[<em class="arg">offset</em>][{<em class="arg">^!<></em>}]<br/>
				4550	+page
				4551	</h4>
				4552	</div>
				4553
				4554	<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>
				4555
				4556	<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>
				4557
				4558	<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>
				4559
				4560	<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>
				4561	<table id="geometryTable" cellpadding="2" cellspacing="0" border="1" width="50%" style="margin-left: auto; margin-right: auto;">
				4562	<thead>
				4563	<tr valign="top">
				4564	<th align="center"><em class="arg">media</em></th>
				4565	<th align="center"><em class="arg">width</em></th>
				4566	<th align="center"><em class="arg">height</em></th>
				4567	</tr>
				4568	</thead>
				4569	<tbody>
				4570	<tr><td align="left"> 11x17 </td> <td align="right"> 792</td> <td align="right"> 1224</td> </tr>
				4571	<tr><td align="left"> Ledger </td> <td align="right"> 1224</td> <td align="right"> 792</td> </tr>
				4572	<tr><td align="left"> Legal </td> <td align="right"> 612</td> <td align="right"> 1008</td> </tr>
				4573	<tr><td align="left"> Letter </td> <td align="right"> 612</td> <td align="right"> 792</td> </tr>
				4574	<tr><td align="left"> LetterSmall</td> <td align="right"> 612</td> <td align="right"> 792</td> </tr>
				4575	<tr><td align="left"> ArchE </td> <td align="right"> 2592</td> <td align="right"> 3456</td> </tr>
				4576	<tr><td align="left"> ArchD </td> <td align="right"> 1728</td> <td align="right"> 2592</td> </tr>
				4577	<tr><td align="left"> ArchC </td> <td align="right"> 1296</td> <td align="right"> 1728</td> </tr>
				4578	<tr><td align="left"> ArchB </td> <td align="right"> 864</td> <td align="right"> 1296</td> </tr>
				4579	<tr><td align="left"> ArchA </td> <td align="right"> 648</td> <td align="right"> 864</td> </tr>
				4580	<tr><td align="left"> A0 </td> <td align="right"> 2380</td> <td align="right"> 3368</td> </tr>
				4581	<tr><td align="left"> A1 </td> <td align="right"> 1684</td> <td align="right"> 2380</td> </tr>
				4582	<tr><td align="left"> A2 </td> <td align="right"> 1190</td> <td align="right"> 1684</td> </tr>
				4583	<tr><td align="left"> A3 </td> <td align="right"> 842</td> <td align="right"> 1190</td> </tr>
				4584	<tr><td align="left"> A4 </td> <td align="right"> 595</td> <td align="right"> 842</td> </tr>
				4585	<tr><td align="left"> A4Small </td> <td align="right"> 595</td> <td align="right"> 842</td> </tr>
				4586	<tr><td align="left"> A5 </td> <td align="right"> 421</td> <td align="right"> 595</td> </tr>
				4587	<tr><td align="left"> A6 </td> <td align="right"> 297</td> <td align="right"> 421</td> </tr>
				4588	<tr><td align="left"> A7 </td> <td align="right"> 210</td> <td align="right"> 297</td> </tr>
				4589	<tr><td align="left"> A8 </td> <td align="right"> 148</td> <td align="right"> 210</td> </tr>
				4590	<tr><td align="left"> A9 </td> <td align="right"> 105</td> <td align="right"> 148</td> </tr>
				4591	<tr><td align="left"> A10 </td> <td align="right"> 74</td> <td align="right"> 105</td> </tr>
				4592	<tr><td align="left"> B0 </td> <td align="right"> 2836</td> <td align="right"> 4008</td> </tr>
				4593	<tr><td align="left"> B1 </td> <td align="right"> 2004</td> <td align="right"> 2836</td> </tr>
				4594	<tr><td align="left"> B2 </td> <td align="right"> 1418</td> <td align="right"> 2004</td> </tr>
				4595	<tr><td align="left"> B3 </td> <td align="right"> 1002</td> <td align="right"> 1418</td> </tr>
				4596	<tr><td align="left"> B4 </td> <td align="right"> 709</td> <td align="right"> 1002</td> </tr>
				4597	<tr><td align="left"> B5 </td> <td align="right"> 501</td> <td align="right"> 709</td> </tr>
				4598	<tr><td align="left"> C0 </td> <td align="right"> 2600</td> <td align="right"> 3677</td> </tr>
				4599	<tr><td align="left"> C1 </td> <td align="right"> 1837</td> <td align="right"> 2600</td> </tr>
				4600	<tr><td align="left"> C2 </td> <td align="right"> 1298</td> <td align="right"> 1837</td> </tr>
				4601	<tr><td align="left"> C3 </td> <td align="right"> 918</td> <td align="right"> 1298</td> </tr>
				4602	<tr><td align="left"> C4 </td> <td align="right"> 649</td> <td align="right"> 918</td> </tr>
				4603	<tr><td align="left"> C5 </td> <td align="right"> 459</td> <td align="right"> 649</td> </tr>
				4604	<tr><td align="left"> C6 </td> <td align="right"> 323</td> <td align="right"> 459</td> </tr>
				4605	<tr><td align="left"> Flsa </td> <td align="right"> 612</td> <td align="right"> 936</td> </tr>
				4606	<tr><td align="left"> Flse </td> <td align="right"> 612</td> <td align="right"> 936</td> </tr>
				4607	<tr><td align="left"> HalfLetter </td> <td align="right"> 396</td> <td align="right"> 612</td> </tr>
				4608	</tbody>
				4609	</table>
				4610
				4611
				4612
				4613
				4614	<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>
				4615
				4616	<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>
				4617
				4618	<p>The default page dimensions for a TEXT image is 612x792.</p>
				4619
				4620	<p>This option is used in concert with <a href="#density">-density</a>.</p>
				4621
				4622	<p>Use <a href="#page">+page</a> to remove the page settings for an image.</p>
				4623
				4624	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4625	<h4><a id="paint"></a>-paint <em class="arg">radius</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4626	</div>
				4627
				4628	<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>
				4629
				4630	<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>
				4631
				4632	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4633	<h4><a id="path"></a>-path <em class="arg">path</em></h4></div>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4634
				4635	<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>
				4636
				4637	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4638	<h4><a id="pause_animate_"></a>-pause <em class="arg">seconds</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4639	</div>
				4640
				4641	<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>
				4642
				4643	<p>Pause for the specified number of seconds before repeating the animation.</p>
				4644
				4645	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4646	<h4><a id="pause_import_"></a>-pause <em class="arg">seconds</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4647	</div>
				4648
				4649	<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>
				4650
				4651	<p>Pause for the specified number of seconds before taking the next snapshot.</p>
				4652
				4653	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4654	<h4><a id="ping"></a>-ping</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4655	</div>
				4656
				4657	<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>
				4658
				4659	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4660	<h4><a id="pointsize"></a>-pointsize <em class="arg">value</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%'>pointsize of the PostScript, OPTION1, or TrueType font.</td><td style='text-align:right;'></td></tr></table>
				4664
				4665	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4666	<h4><a id="polaroid"></a>-polaroid <em class="arg">angle</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4667	</div>
				4668
				4669	<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>
				4670
				4671	<p>Use <kbd>+polaroid</kbd> to rotate the image at a random angle between -15 and +15 degrees.</p>
				4672
				4673	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4674	<h4><a id="posterize"></a>-posterize <em class="arg">levels</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%'>reduce the image to a limited number of color levels.</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="precision"></a>-precision <em class="arg">value</em></h4>
cristy	d43a46b	2010-01-21 02:13:41 +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%'>set the maximum number of significant digits to be printed.</td><td style='text-align:right;'></td></tr></table>
				4684
				4685	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4686	<h4><a id="preview"></a>-preview <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4687	</div>
				4688
				4689	<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>
				4690
				4691	<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>
				4692
				4693	<pre class="text">
				4694	Rotate
				4695	Shear
				4696	Roll
				4697	Hue
				4698	Saturation
				4699	Brightness
				4700	Gamma
				4701	Spiff
				4702	Dull
				4703	Grayscale
				4704	Quantize
				4705	Despeckle
				4706	ReduceNoise
				4707	Add Noise
				4708	Sharpen
				4709	Blur
				4710	Threshold
				4711	EdgeDetect
				4712	Spread
				4713	Shade
				4714	Raise
				4715	Segment
				4716	Solarize
				4717	Swirl
				4718	Implode
				4719	Wave
				4720	OilPaint
				4721	CharcoalDrawing
				4722	JPEG
				4723	</pre>
				4724
				4725	<p>To print a complete list of previews, use the <a href="#list">-list preview</a> option.</p>
				4726
				4727	<p>The default preview is <kbd>JPEG</kbd>.</p>
				4728
				4729	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4730	<h4><a id="print"></a>-print <em class="arg">string</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4731	</div>
				4732
				4733	<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>
				4734
				4735	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4736	<h4><a id="process"></a>-process <em class="arg">command</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4737	</div>
				4738
				4739	<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>
				4740
				4741	<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>
				4742
				4743	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4744	<h4><a id="profile"></a>-profile <em class="arg">filename</em><br/>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4745	+profile <em class="arg">profile_name</em></h4>
				4746	</div>
				4747
				4748	<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>
				4749
				4750	<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>
				4751
				4752	<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>
				4753
				4754	<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>
				4755
				4756	<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>
				4757
				4758	<p>For example, to extract the Exif data (which is stored in JPEG files in the <em class="arg">APP1</em> profile), use.</p>
				4759
				4760	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert cockatoo.jpg profile.exif</span></p>
				4761	<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>
				4762
				4763	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert CMYK.tif -profile "CMYK.icc" -profile "RGB.icc" RGB.tiff</span></p>
				4764	<p>Furthermore, since ICC profiles are not necessarily symmetric, extra conversion steps can yield unwanted results.
				4765	CMYK profiles are often very asymmetric since they involve 3−>4 and 4−>3 channel mapping.
				4766	</p>
				4767
				4768	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4769	<h4><a id="quality"></a>-quality <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4770	</div>
				4771
				4772	<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>
				4773
cristy	851dbce	2010-08-06 21:40:00 +0000	[diff] [blame]	4774	<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]	4775
				4776	<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>
				4777
cristy	851dbce	2010-08-06 21:40:00 +0000	[diff] [blame]	4778	<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]	4779
cristy	3c98a4f	2010-08-13 20:09:41 +0000	[diff] [blame]	4780	<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]	4781
				4782	<p>If filter-type is 4 or less, the specified filter-type is used for all scanlines:</p>
				4783
				4784	<pre class="text">
				4785	0: none
				4786	1: sub
				4787	2: up
				4788	3: average
				4789	4: Paeth
				4790	</pre>
				4791
				4792	<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>
				4793
				4794	<p>If filter-type is 6, adaptive filtering with <em class="arg">minimum-sum-of-absolute-values</em> is used.</p>
				4795
				4796	<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>
				4797
cristy	3c98a4f	2010-08-13 20:09:41 +0000	[diff] [blame]	4798	<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]	4799
				4800	<p>For further information, see the <a href="http://www.w3.org/pub/WWW/TR">PNG</a> specification.</p>
				4801
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4802	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4803	<h4><a id="quantize"></a>-quantize <em class="arg">colorspace</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4804	</div>
				4805
cristy	3c98a4f	2010-08-13 20:09:41 +0000	[diff] [blame]	4806	<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]	4807
cristy	3c98a4f	2010-08-13 20:09:41 +0000	[diff] [blame]	4808	<p>This setting defines the colorspace used to sort out and reduce the number
				4809	of colors needed by an image (for later dithering) by operators such as <a
				4810	href="#colors" >-colors</a>, Note that color reducion also happens
				4811	automatically when saving images to color-limited image file formats, such as
				4812	GIF, and PNG8.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4813
				4814
				4815	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4816	<h4><a id="quiet"></a>-quiet</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4817	</div>
				4818
				4819	<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>
				4820
				4821	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4822	<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]	4823	</div>
				4824
				4825	<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>
				4826
				4827	<p>Note that this is actually a rotational blur rather than a radial and as
				4828	such actually mis-named. </p>
				4829
				4830	<p>The <a href="#virtual-pixel">-virtual-pixel</a> setting will determine how
				4831	pixels which are outside the image proper are blurred into the final result.
				4832	</p>
				4833
				4834
				4835	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4836	<h4><a id="raise"></a>-raise <em class="arg">thickness</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4837	</div>
				4838
				4839	<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>
				4840
				4841	<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>.
				4842	</p>
				4843
				4844	<p>Unlike the similar <a href="#frame">-frame</a> option, <a href="#raise">-raise</a> does not alter the dimensions of the image.</p>
				4845
				4846	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4847	<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]	4848	</div>
				4849
				4850	<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>
				4851
				4852	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4853	<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]	4854	</div>
				4855
				4856	<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>
				4857
				4858	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4859	<h4><a id="regard-warnings"></a>-regard-warnings</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4860	</div>
				4861
				4862	<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>
				4863
				4864	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4865	<h4><a id="remap"></a>-remap <em class="arg">filename</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4866	</div>
				4867
				4868	<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>
				4869
				4870	<p>If the <a href="#dither">-dither</a> setting is enabled (the default) then
				4871	the given colors are dithered over the image as necessary, otherwise the closest
				4872	color (in RGB colorspace) is selected to replace that pixel in the image. </p>
				4873
				4874	<p>As a side effect of applying a <a href="#remap">-remap</a> of colors across all
				4875	images in the current image sequence, all the images will have the same color
				4876	table. That means that when saved to a file format such as GIF, it will use
				4877	that color table as a single common or global color table, for all the images,
				4878	without requiring extra local color tables. </p>
				4879
				4880	<p>Use <a href="#remap">+remap</a> to reduce all images in the current image
				4881	sequence to use a common color map over all the images. This equivalent to
				4882	appending all the images together (without extra background colors) and color
				4883	reducing those images using <a href="#colors">-colors</a> with a 256 color
				4884	limit, then <a href="#remap">-remap</a> those colors over the original list of
				4885	images. This ensures all the images follow a single color map. </p>
				4886
				4887	<p>If the number of colors over all the images is less than 256, then <a
				4888	href="#remap">+remap</a> should not perform any color reduction or dithering, as
				4889	no color changes are needed. In that case, its only effect is to force the use
				4890	of a global color table. This recommended after using either <a
				4891	href="#colors">-colors</a> or <a href="#ordered-dither">-ordered-dither</a> to
				4892	reduce the number of colors in an animated image sequence. </p>
				4893
				4894	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4895	<h4><a id="region"></a>-region <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4896	</div>
				4897
				4898	<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>
				4899
				4900	<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>
				4901
				4902	<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>
				4903
				4904	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4905	<h4><a id="remote"></a>-remote</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4906	</div>
				4907
				4908	<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>
				4909
				4910	<p>The only command recognized is the name of an image file to load.</p>
				4911
				4912	<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>
				4913
				4914	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4915	<h4><a id="render"></a>-render</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4916	</div>
				4917
				4918	<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>
				4919
				4920	<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>
				4921
				4922	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4923	<h4><a id="repage"></a>-repage <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4924	</div>
				4925
				4926	<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>
				4927
				4928	<p>This option is like <a href="#page">-page</a> but acts as an image operator
				4929	rather than a setting. You can separately set the canvas size or the offset
				4930	of the image on that canvas by only providing those components. </p>
				4931
				4932	<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>
				4933
				4934	<p>If a <kbd>!</kbd> flag is given the offset given is added to the existing
				4935	offset to move the image relative to its previous position. This useful for
				4936	animation sequences. </p>
				4937
				4938	<p>A given a canvas size of zero such as '<kbd>0x0</kbd>' forces it to
				4939	recalculate the canvas size so the image (at its current offset) will appear
				4940	completely on that canvas (unless it has a negative offset).</p>
				4941
				4942	<p>Use <a href="#repage">+repage</a> to completely remove/reset the virtual
				4943	canvas meta-data from the images. </p>
				4944
				4945	<p>The <a href="#set">-set</a> '<kbd>page</kbd>' option can be used to
				4946	directly assign virtual canvas meta-data. </p>
				4947
				4948
				4949	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4950	<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]	4951	</div>
				4952
				4953	<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>
				4954
				4955	<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>
				4956
				4957	<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>
				4958
				4959	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4960	<h4><a id="resize"></a>-resize <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4961	</div>
				4962
				4963	<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>
				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. Offsets, if present in the geometry string, are ignored, and the <a href="#gravity">-gravity</a> option has no effect.</p>
				4966
				4967	<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>
				4968
cristy	1353896	2010-02-26 17:53:04 +0000	[diff] [blame]	4969	<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>
				4970
cristy	4949d52	2010-03-12 18:41:34 +0000	[diff] [blame]	4971	<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]	4972	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4973	<h4><a id="respect-parentheses"></a>-respect-parentheses</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4974	</div>
				4975
				4976	<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>
				4977
				4978	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4979	<h4><a id="reverse"></a>-reverse</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	4980	</div>
				4981
				4982	<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>
				4983
				4984
				4985	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4986	<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]	4987	</div>
				4988
				4989	<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>
				4990
				4991	<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>
				4992
				4993
				4994	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	4995	<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]	4996	</div>
				4997
				4998	<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>
				4999
				5000	<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>
				5001
				5002	<p>Empty triangles in the corners, left over from rotating the image, are
				5003	filled with the <kbd>background</kbd> color. </p>
				5004
				5005	<p>See also the <a href="#distort">-distort</a> operator and specifically the
				5006	'<kbd>ScaleRotateTranslate</kbd>' distort method. </p>
				5007
				5008
				5009	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5010	<h4><a id="sample"></a>-sample <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5011	</div>
				5012
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5013	<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]	5014
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5015	<p>Change the image size simply by directly sampling the pixels original
				5016	image. When magnifying, pixels are replicated in blocks. When minifying,
				5017	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]	5018
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5019	<p>The results are thus equivalent to using <a href="#resize">-resize</a> with
				5020	a <a href="#filter">-filter</a> setting of <kbd>point</kbd> (nearest
				5021	neighbour), though <a href="#sample">-sample</a> is a lot faster, as it
				5022	avoids all the filter processing of the image. As such it completely ignores
				5023	the current <a href="#filter">-filter</a> setting. </p>
				5024
				5025	<p>The key feature of the <a href="#sample">-sample</a> is that no new colors
				5026	will be added to the resulting image, though some colors may disappear. </p>
				5027
				5028	<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
				5029	ignored, unlike <a href="#resize">-resize</a>. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5030
				5031
				5032	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5033	<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]	5034	</div>
				5035
				5036	<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>
				5037
				5038	<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>
				5039
				5040	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5041	<h4><a id="scale"></a>-scale <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5042	</div>
				5043
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5044	<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]	5045
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5046	<p>Change the image size simply by replacing pixels by averaging pixels
				5047	together when minifying, or replacing pixels when magnifing. </p>
				5048
				5049	<p>The results are thus equivalent to using <a href="#resize">-resize</a> with
				5050	a <a href="#filter">-filter</a> setting of <kbd>box</kbd>. Though it is a lot
				5051	faster, as it avoids all the filter processing of the image. As such it
				5052	completely ignores the current <a href="#filter">-filter</a> setting. </p>
				5053
				5054	<p>If when shrinking (minifying) images the original image is some integer
				5055	multiple of the new image size, the number of pixels avergaed together to
				5056	produce the new pixel color is the same across the whole image. This is
				5057	a special case known as 'binning' and is often used as a method of reducing
				5058	noise in image such as those generated by digital cameras, especially in low
				5059	light conditions. </p>
				5060
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5061
				5062	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5063	<h4><a id="scene"></a>-scene <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5064	</div>
				5065
				5066	<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>
				5067
				5068	<p>This option sets the scene number of an image or the first image in an image sequence.</p>
				5069
				5070	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5071	<h4><a id="screen"></a>-screen</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5072	</div>
				5073
				5074	<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>
				5075
				5076	<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>
				5077
				5078	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5079	<h4><a id="seed"></a>-seed</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5080	</div>
				5081
				5082	<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>
				5083
				5084	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5085	<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]	5086	</div>
				5087
				5088	<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>
				5089
				5090	<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>
				5091
				5092	<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>
				5093
				5094	<p>If the <a href="#verbose">-verbose</a> setting is defined, a detailed report
				5095	of the color clusters is returned.</p>
				5096
				5097
				5098	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5099	<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]	5100	</div>
				5101
cristy	2e2662a	2010-10-09 14:29:37 +0000	[diff] [blame]	5102	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5103	<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]	5104	</div>
				5105
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5106	<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>
				5107
cristy	2e2662a	2010-10-09 14:29:37 +0000	[diff] [blame]	5108	<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>
				5109
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5110	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5111	<h4><a id="separate"></a>-separate</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5112	</div>
				5113
				5114	<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>
				5115
				5116	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5117	<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]	5118	</div>
				5119
				5120	<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>
				5121
				5122	<p>Specify <em class="arg">threshold</em> as the percent threshold of the intensity (0 - 99.9%).</p>
				5123
				5124	<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>
				5125
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5126
				5127
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5128	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5129	<h4><a id="set"></a>-set <em class="arg">key value</em></h4>
				5130	<h4>+set <em class="arg">key</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5131	</div>
				5132
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5133	<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]	5134	image sequence.</td><td style='text-align:right;'></td></tr></table>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5135
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5136	<p>This will assign (or modify) specific settings attached to all the images
				5137	in the current image sequence. Using the <a href="#set">+set</a> form of the
				5138	option will either remove, or reset that setting to a default state, as
				5139	appropriate. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5140
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5141	<p>For example, it will modify specific well known image meta-data
				5142	'attributes' such as those normally overridden by: the options <a
				5143	href="#delay" >-delay</a>, <a href="#dispose" >-dispose</a>, and <a
				5144	href="#page" >-page</a>, <a href="#colorspace" >-colorspace</a>; generally
				5145	assigned before the image is read in, by using a <em class="arg">key</em> of
				5146	the same name. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5147
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5148	<p>If the given <em class="arg">key</em> does not match a specific known
				5149	'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]	5150	'properity' string. Such settings are listed in <a href="#verbose"
				5151	>-verbose</a> information ("<kbd>info:</kbd>" output format) as "Properties".
				5152	</p>
				5153
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5154	<p>This includes string 'properities' that are set by and assigned to images
				5155	using the options <a href="#comment" >-comment</a>, <a href="#label"
				5156	>-label</a>, <a href="#caption" >-caption</a>. These options actually assign
				5157	a global 'artifact' which are automatically assigned (and any <a href="../www/escape.html" >Format Percent
				5158	Escapes</a> expanded) to images as they are read in. For example:</p>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5159
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5160	<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>
				5161	<p>The set value can also make use of <a href="../www/escape.html" >Format and Print Image
				5162	Properties</a> in the defined value. For example:</p>
				5163
				5164	<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>
				5165	<p>Other well known 'properities' that can be include:
				5166	'<kbd>date:create</kbd>' and '<kbd>date:modify</kbd>' and
				5167	'<kbd>signature</kbd>'. </p>
				5168
				5169	<p>The <a href="#repage">-repage</a> operator will also allow you to modify
				5170	the '<kbd>page</kbd>' attribute of an image for images already in memory (also
				5171	see <a href="#repage">-page</a>). However it is designed to provide a finer
				5172	control of the sub-parts of this 'attribute'. The <a href="#set">-set page</a>
				5173	option will only provide a direct, unmodified assignment of '<kbd>page</kbd>'
				5174	attribute. </p>
				5175
				5176	<p>This option can also associate a colorspace or profile with your image.
				5177	For example,</p>
				5178
				5179	<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]	5180	<p>Some 'properties' must be defined in a specific way to be used. For
				5181	example only 'properties' prefixed with "<kbd>filename:</kbd>" can be used to
				5182	modify the output filename of an image. For example</p>
				5183
				5184	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert rose: -set filename:mysize '%wx%h' 'rose_%[filename:mysize].png'</span></p>
				5185	<p>If the setting value is prefixed with "<kbd>option:</kbd>" the setting will
				5186	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]	5187	href="#define" >-define</a> option. As such settings are globel in scope, they
				5188	can be used to pass 'attributes' and 'properities' of one specific image,
				5189	in a way that allows you to use them in a completely different image, even if
				5190	the original image has long since been modified or destroyed. For example: </p>
				5191
				5192	<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>
				5193	<p>Note that <a href="../www/escape.html" >Format Percent Escapes</a> will only match
				5194	a 'artifact' if the given <em class="arg">key</em> does not match an existing
				5195	'attribute' or 'properity'. </p>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5196
				5197	<p>You can set the attributes of the image registry by prefixing the value
				5198	with <kbd>registry:</kbd>.</p>
				5199
				5200
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5201
				5202	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5203	<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]	5204	</div>
				5205
				5206	<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>
				5207
				5208	<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>
				5209
				5210	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5211	<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]	5212	</div>
				5213
				5214	<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>
				5215
				5216	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5217	<h4><a
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5218	id="shared-memory"></a>-shared-memory</h4>
				5219	</div>
				5220
				5221	<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>
				5222
				5223	<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>
				5224
				5225	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5226	<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]	5227	</div>
				5228
				5229	<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>
				5230
				5231	<p>Use a Gaussian operator of the given radius and standard deviation (sigma).</p>
				5232
				5233	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5234	<h4><a id="shave"></a>-shave <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5235	</div>
				5236
				5237	<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>
				5238
				5239	<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>
				5240
				5241	<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>
				5242
				5243	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5244	<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]	5245	</div>
				5246
				5247	<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>
				5248
				5249	<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>
				5250
				5251	<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>
				5252
				5253	<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>
				5254
				5255	<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>
				5256
				5257	<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>
				5258	<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>
				5259
				5260	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert logo: -shear 20x60 logo-sheared.png</span></p>
				5261	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5262	<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]	5263	</div>
				5264
				5265	<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>
				5266
				5267	<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>
				5268
				5269	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5270	<h4><a id="silent"></a>-silent</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5271	</div>
				5272
				5273	<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>
				5274
				5275	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5276	<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]	5277	</div>
				5278
				5279	<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>
				5280
				5281	<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>
				5282
				5283	<p>For Photo CD images, choose from these sizes:</p>
				5284
				5285	<pre class="text">
				5286	192x128
				5287	384x256
				5288	768x512
				5289	1536x1024
				5290	3072x2048
				5291	</pre>
				5292
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5293	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5294	<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]	5295	</div>
				5296
				5297	<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>
				5298
				5299	<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>
				5300
				5301	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5302	<h4><a id="snaps"></a>-snaps <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5303	</div>
				5304
				5305	<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>
				5306
				5307	<p>Use this option to grab more than one image from the X server screen, to create an animation sequence.</p>
				5308
				5309	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5310	<h4><a id="solarize"></a>-solarize <em class="arg">threshold</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5311	</div>
				5312
				5313	<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>
				5314
				5315	<p>Specify <em class="arg">factor</em> as the percent threshold of the intensity (0 - 99.9%).</p>
				5316
				5317	<p>This option produces a <em class="arg">solarization</em> effect seen when exposing a photographic film to light during the development process.</p>
				5318
				5319	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5320	<h4><a id="sparse-color"></a>-sparse-color <em
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5321	class="arg">method</em> '<em class="arg">x</em>,<em class="arg">y</em> <em class="arg">color</em> ...'</h4>
				5322	</div>
				5323
				5324	<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>
				5325
				5326
				5327	<table class="doc">
				5328	<tbody>
				5329	<tr valign="top">
				5330	<th align="left" style="width: 8%">Method</th>
				5331	<th align="left">Description</th>
				5332	</tr>
				5333
				5334	<tr valign="top">
				5335	<td valign="top">voronoi</td>
				5336	<td valign="top">Simply map each pixel to the to nearest color point
				5337	given. The result are polygonal 'cells' of solid color. </td>
				5338	</tr>
				5339
				5340	<tr valign="top">
				5341	<td valign="top">shepards</td>
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5342	<td valign="top">Colors points biased on the ratio of inverse distance
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5343	squared. Generating spots of color in a sea of the average of
				5344	colors. </td>
				5345	</tr>
				5346
				5347	<tr valign="top">
				5348	<td valign="top">barycentric</td>
				5349	<td valign="top">three point triangle of color given 3 points.
				5350	Giving only 2 points will form a linear gradient between those points.
				5351	Gradient is however not restricted to just the triangle or line. </td>
				5352	</tr>
				5353
				5354	<tr valign="top">
				5355	<td valign="top">bilinear</td>
				5356	<td valign="top">Like barycentric but for 4 points. Less than 4 points
				5357	fall back to barycentric. </td>
				5358	</tr>
				5359
				5360	</tbody>
				5361	</table>
				5362
				5363	<p>The points are placed according to the images location on the virtual
				5364	canvas (<a href="#page" >-page</a> or <a href="#repage" >-repage</a>
				5365	offset), and do not actually have to exist on the given image, but may be
				5366	some point beyond the edge of the image. All points are floating point values.
				5367	</p>
				5368
				5369	<p>Only the color channels defined by the <a href="#channel" >-channel</a> are
				5370	modified, whcih means the matte/alpha transparency channel is not effected by
				5371	default. If enabled, the image also needs a the matte/alpha channel to be
				5372	enabled for this operator to effect an images transparency. This is typical
				5373	transparency handling for images. </p>
				5374
				5375	<p>All the above methods when given a single point of color will replace all
				5376	the colors in the image with the color given, regardless of the point. This is
				5377	logical, and provides an alternative technique to recolor a image to some
				5378	default value. </p>
				5379
				5380
				5381	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5382	<h4><a id="splice"></a>-splice <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5383	</div>
				5384
				5385	<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>
				5386
				5387	<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>
				5388
				5389	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5390	<h4><a id="spread"></a>-spread <em class="arg">amount</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5391	</div>
				5392
				5393	<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>
				5394
				5395	<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>
				5396
				5397	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5398	<h4><a id="stegano"></a>-stegano <em class="arg">offset</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5399	</div>
				5400
				5401	<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>
				5402
				5403	<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>
				5404
				5405	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5406	<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]	5407	</div>
				5408
				5409	<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>
				5410
				5411	<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>
				5412
				5413	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5414	<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]	5415	</div>
				5416
				5417	<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>
				5418
				5419	<pre class="text">
				5420	char store pixels as unsigned characters
				5421	double store pixels as doubles
				5422	float store pixels as floats
				5423	integer store pixels as integers
				5424	long store pixels as longs
				5425	quantum store pixels in the native depth of your ImageMagick distribution
				5426	short store pixels as unsigned shorts
				5427	</pre>
				5428
				5429	<p>Float and double types are normalized from 0.0 to 1.0 otherwise the pixels
				5430	values range from 0 to the maximum value the storage type can support.</p>
				5431
				5432	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5433	<h4><a id="stretch"></a>-stretch <em class="arg">fontStretch</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5434	</div>
				5435
				5436	<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>
				5437
				5438	<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>
				5439
				5440	<pre class="text">
				5441	Any
				5442	Condensed
				5443	Expanded
				5444	ExtraCondensed
				5445	ExtraExpanded
				5446	Normal
				5447	SemiCondensed
				5448	SemiExpanded
				5449	UltraCondensed
				5450	UltraExpanded
				5451	</pre>
				5452
				5453	<p>To print a complete list of stretch types, use <a href="#list">-list stretch</a>.</p>
				5454
				5455	<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>
				5456
				5457	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5458	<h4><a id="strip"></a>-strip</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5459	</div>
				5460
				5461	<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>
				5462
				5463	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5464	<h4><a id="stroke"></a>-stroke <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5465	</div>
				5466
				5467	<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>
				5468
				5469	<p>The color is specified using the format described under the <a href="#fill">-fill</a> option.</p>
				5470
				5471	<p>See <a href="#draw">-draw</a> for further details.</p>
				5472
				5473	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5474	<h4><a id="strokewidth"></a>-strokewidth <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5475	</div>
				5476
				5477	<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>
				5478
				5479	<p>See <a href="#draw">-draw</a> for further details.</p>
				5480
				5481	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5482	<h4><a id="style"></a>-style <em class="arg">fontStyle</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5483	</div>
				5484
				5485	<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>
				5486
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	5487	<p>This setting suggests a font style that ImageMagick should try to apply to
				5488	the currently selected font family. Select <em class="arg">fontStyle</em> from
				5489	the following.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5490
				5491	<pre class="text">
				5492	Any
				5493	Italic
				5494	Normal
				5495	Oblique
				5496	</pre>
				5497
				5498	<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>
				5499
				5500	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5501	<h4><a id="subimage-search"></a>-subimage-search</h4>
cristy	ae6203d	2010-08-09 01:12:14 +0000	[diff] [blame]	5502	</div>
				5503
cristy	d4d64ed	2010-08-22 22:19:33 +0000	[diff] [blame]	5504	<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>
				5505
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	5506	<p>This option is required to have compare search for the best match location
				5507	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]	5508	(or two frames). The first is the "difference" image and the second will
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	5509	be the "match score" image.</p>
				5510
cristy	d0bd44a	2010-09-24 12:38:11 +0000	[diff] [blame]	5511	<p>The "match-score" image is smaller containing a pixel for ever possible
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	5512	position of the top-left corner of the given sub-image. that is its size will
				5513	be the size of the larger_image - sub_image + 1. The brightest location in
				5514	this image is the location s the locate on the best match that is also
				5515	reported. Note that this may or may nor be a perfect match, and the actual
				5516	brightness will reflect this. Other bright 'peaks' can be used to locate other
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5517	possible matching loctions. </p>
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	5518
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5519	<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]	5520	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]	5521	sub-image the faster this search is. </p>
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	5522
cristy	ae6203d	2010-08-09 01:12:14 +0000	[diff] [blame]	5523
				5524	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5525	<h4><a id="swap"></a>-swap <em class="arg">index,index</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5526	</div>
				5527
				5528	<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>
				5529
cristy	71a3f60	2010-09-15 12:38:16 +0000	[diff] [blame]	5530	<p>For example, <a href="#swap">-swap 0,2</a> swaps the first and the third
				5531	images in the current image sequence. Use <a href="#swap">+swap</a> to switch
				5532	the last two images in the sequence.</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5533
				5534	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5535	<h4><a id="swirl"></a>-swirl <em class="arg">degrees</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5536	</div>
				5537
				5538	<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>
				5539
				5540	<p><em class="arg">Degrees</em> defines the tightness of the swirl.</p>
				5541
				5542	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5543	<h4><a id="synchronize"></a>-synchronize</h4>
cristy	5063d81	2010-10-19 16:28:10 +0000	[diff] [blame]	5544	</div>
				5545
				5546	<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>
				5547
				5548	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5549	<h4><a id="taint"></a>-taint</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5550	</div>
				5551
cristy	5063d81	2010-10-19 16:28:10 +0000	[diff] [blame]	5552	<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]	5553
				5554	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5555	<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]	5556	</div>
				5557
				5558	<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>
				5559
				5560	<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>
				5561
				5562	<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>
				5563
				5564	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5565	<h4><a id="texture"></a>-texture <em class="arg">filename</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5566	</div>
				5567
				5568	<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>
				5569
				5570	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5571	<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]	5572	</div>
				5573
				5574	<!-- {<em class="arg">green,blue,opacity</em>}
				5575	<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>
				5576	-->
				5577
				5578	<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>
				5579
				5580	<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>
				5581
				5582	<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.
				5583	</p>
				5584
				5585	<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>
				5586
				5587	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert in.png -channel red -threshold 50% out.png</span></p>
				5588	<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>
				5589
				5590
				5591	<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>
				5592	<p>Note that the values of the transparency channel is treated as 'matte'
				5593	values (0 is opaque) and not as 'alpha' values (0 is transparent).</p>
				5594
				5595	<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>.
				5596	</p>
				5597
				5598	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5599	<h4><a id="thumbnail"></a>-thumbnail <em class="arg">geometry</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5600	</div>
				5601
				5602	<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>
				5603
				5604	<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>
				5605
				5606	<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>
				5607
				5608	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5609	<h4><a id="tile"></a>-tile <em class="arg">filename</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5610	</div>
				5611
				5612	<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>
				5613
				5614	<div style="margin: auto;">
				5615	<h4>-tile <em class="arg">geometry</em></h4>
				5616	</div>
				5617
				5618	<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>
				5619
				5620	<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>
				5621
				5622	<div style="margin: auto;">
				5623	<h4>-tile</h4>
				5624	</div>
				5625
				5626	<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>
				5627
				5628	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5629	<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]	5630	</div>
				5631
				5632	<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>
				5633
				5634	<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>
				5635
				5636	<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>
				5637
				5638	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5639	<h4><a id="tint"></a>-tint <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5640	</div>
				5641
				5642	<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>
				5643
				5644	<p>Tint the image with the fill color.</p>
				5645
				5646	<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>
				5647
				5648	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5649	<h4><a id="title"></a>-title <em class="arg">string</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5650	</div>
				5651
				5652	<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>
				5653
				5654	<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>
				5655
				5656	<p>For example,</p>
				5657
				5658	<p class="crtsnip">
				5659	-title "%m:%f %wx%h"
				5660	</p>
				5661
				5662	<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>
				5663
				5664
				5665	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5666	<h4><a id="transform"></a>-transform</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5667	</div>
				5668
				5669	<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>
				5670
				5671	<p>This option applies the transformation matrix from a previous <a href="#affine">-affine</a> option.</p>
				5672
				5673	<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]	5674
				5675	<p>This operator has been now been superseded by the <a
				5676	href="#distort">-distort</a> '<kbd>AffineProjection</kbd>' method. </p>
				5677
				5678
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5679	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5680	<h4><a id="transparent"></a>-transparent <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5681	</div>
				5682
				5683	<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>
				5684
				5685	<p>The <em class="arg">color</em> argument is defined using the format
				5686	described under the <a href="#fill">-fill</a> option. The <a href="#fuzz"
				5687	>-fuzz</a> setting can be used to match and replace colors similar to the one
				5688	given. </p>
				5689
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	5690	<p>Use <a href="#transparent" >+transparent</a> to invert the pixels matched.
				5691	that is make all non-matching colors transparent. </p>
				5692
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5693	<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]	5694	href="#transparent" >-transparent</a> but replaces the matching color with the
				5695	current <a href="#fill">-fill</a> color setting, rather than transparent.
				5696	However the <a href="#transparent" >-transparent</a> operator also ensures
				5697	that the image has an alpha channel enabled, as per "<kbd><a href="#alpha"
				5698	>-alpha</a> set</kbd>", and does not require you to modify the <a
				5699	href="#channel">-channel</a> to enable alpha channel handling. </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5700
cristy	b36feb2	2010-03-26 16:54:37 +0000	[diff] [blame]	5701	<p>Note that this does not define the color as being the 'transparency color'
				5702	used for color-mapped image formats, such as GIF. For that use <a
				5703	href="#transparent-color" >-transparent-color</a> </p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5704
				5705
				5706	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5707	<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]	5708	</div>
				5709
				5710	<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>
				5711
				5712	<p>Sometimes this is used for saving to image formats such as
				5713	GIF and PNG8 which uses this color to represent boolean transparency. This
				5714	does not make a color transparent, it only defines what color the transparent
				5715	color is in the color palette of the saved image. Use <a
				5716	href="#transparent">-transparent</a> to make an opaque color transparent.</p>
				5717
				5718	<p>This option allows you to have both an opaque visible color, as well as a
				5719	transparent color of the same color value without conflict. That is, you can
				5720	use the same color for both the transparent and opaque color areas within an
				5721	image. This, in turn, frees to you to select a transparent color that is
				5722	appropriate when an image is displayed by an application that does not handle a
				5723	transparent color index, while allowing ImageMagick to correctly handle images of this
				5724	type. </p>
				5725
				5726	<p>The default transparent color is <kbd>#00000000</kbd>, which is fully transparent black.</p>
				5727
				5728	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5729	<h4><a id="transpose"></a>-transpose</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5730	</div>
				5731
				5732	<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>
				5733
				5734	<p> This option mathematically transposes the pixel array. It is equivalent to the sequence <kbd>-flip -rotate 90</kbd>.
				5735	</p>
				5736
				5737	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5738	<h4><a id="transverse"></a>-transverse</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5739	</div>
				5740
				5741	<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>
				5742
				5743
				5744	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5745	<h4><a id="treedepth"></a>-treedepth <em class="arg">value</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5746	</div>
				5747
				5748	<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>
				5749
				5750	<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>
				5751
				5752	<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>
				5753
				5754	<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>
				5755
				5756	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5757	<h4><a id="trim"></a>-trim</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5758	</div>
				5759
				5760	<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>
				5761
				5762	<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>
				5763
				5764	<p>The page or virtual canvas information of the image is preserved allowing
				5765	you to extract the result of the <a href="#trim">-trim</a> operation from the
				5766	image. Use a <a href="#repage">+repage</a> to remove the virtual canvas page
				5767	information if it is unwanted.</p>
				5768
				5769	<p>If the trimmed image 'disappears' an warning is produced, and a special
				5770	single pixel transparent 'missed' image is returned, in the same way as when a
				5771	<a href="#crop">-crop</a> operation 'misses' the image proper. </p>
				5772
				5773
				5774	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5775	<h4><a id="type"></a>-type <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5776	</div>
				5777
				5778	<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]	5779	<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]	5780
				5781	<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>
				5782
				5783	<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert bird.png -type TrueColor bird.jpg</span></p>
				5784	<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>
				5785
				5786	<p>Use <a href="#type">-type optimize</a> to ensure the image is written in the smallest possible file size.</p>
				5787
				5788	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5789	<h4><a id="undercolor"></a>-undercolor <em class="arg">color</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5790	</div>
				5791
				5792	<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>
				5793
				5794	<p>The color is specified using the format described under the <a href="#fill">-fill</a> option.</p>
				5795
				5796	<p>See <a href="#draw">-draw</a> for further details.</p>
				5797
				5798
				5799	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5800	<h4><a id="update"></a>-update <em class="arg">seconds</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5801	</div>
				5802
				5803	<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>
				5804
				5805	<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>
				5806
				5807
				5808	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5809	<h4><a id="unique-colors"></a>-unique-colors</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5810	</div>
				5811
				5812	<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>
				5813
				5814
				5815	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5816	<h4><a id="units"></a>-units <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5817	</div>
				5818
				5819	<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>
				5820
				5821	<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>
				5822
				5823
				5824	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5825	<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]	5826	</div>
				5827
				5828	<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>
				5829
				5830	<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>
				5831
				5832	<p>The parameters are:</p>
				5833
				5834	<pre class="text">
				5835	radius: The radius of the Gaussian, in pixels, not counting the center
				5836	pixel (default 0).
				5837	sigma: The standard deviation of the Gaussian, in pixels (default 1.0).
				5838	amount: The fraction of the difference between the original and the blur
				5839	image that is added back into the original (default 1.0).
				5840	threshold: The threshold, as a fraction of <em class="QR">QuantumRange</em>, needed to apply the
				5841	difference amount (default 0.05).
				5842	</pre>
				5843
				5844
				5845	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5846	<h4><a id="verbose"></a>-verbose</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5847	</div>
				5848
cristy	d0bda5e	2010-09-21 16:22:45 +0000	[diff] [blame]	5849	<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]	5850
				5851
				5852	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5853	<h4><a id="version"></a>-version</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5854	</div>
				5855
				5856	<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>
				5857
				5858
				5859	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5860	<h4><a id="view"></a>-view <em class="arg">string</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5861	</div>
				5862
				5863	<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>
				5864
				5865
				5866	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5867	<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]	5868	</div>
				5869
				5870	<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>
				5871
				5872
				5873	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5874	<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]	5875	</div>
				5876
				5877	<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>
				5878
				5879	<p>This option defines what color source should be used if and when a color
				5880	lookup completely 'misses' the source image. The color(s) that appear to
				5881	surround the source image. Generally this color is derived from the source
				5882	image, but could also be set to a specify background color. </p>
				5883
				5884	<p>Choose from these methods:</p>
				5885
				5886	<pre class="text">
				5887	background: the area surrounding the image is the background color
				5888	black: the area surrounding the image is black
				5889	checker-tile: alternate squares with image and background color
				5890	dither: non-random 32x32 dithered pattern
				5891	edge: extend the edge pixel toward infinity
				5892	gray: the area surrounding the image is gray
				5893	horizontal-tile: horizontally tile the image, background color above/below
				5894	horizontal-tile-edge: horizontally tile the image and replicate the side edge pixels
				5895	mirror: mirror tile the image
				5896	random: choose a random pixel from the image
				5897	tile: tile the image (default)
				5898	transparent: the area surrounding the image is transparent blackness
				5899	vertical-tile: vertically tile the image, sides are background color
				5900	vertical-tile-edge: vertically tile the image and replicate the side edge pixels
				5901	white: the area surrounding the image is white
				5902	</pre>
				5903
				5904	<p>The default value is "edge".</p>
				5905
				5906	<p>This most important for distortion operators such as <a href="#distort"
				5907	>-distort</a>, <a href="#implode" >-implode</a>, and <a href="#fx" >-fx</a>.
				5908	However it also effects operations that may access pixels just outside the
				5909	image proper, such as <a href="#convolve">-convolve</a>, <a
				5910	href="#blur">-blur</a>, and <a href="#sharpen">-sharpen</a>. </p>
				5911
				5912	<p>To print a complete list of virtual pixel types, use the <a href="#list">-list virtual-pixel</a> option.</p>
				5913
				5914
				5915	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5916	<h4><a id="visual"></a>-visual <em class="arg">type</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5917	</div>
				5918
				5919	<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>
				5920
				5921	<p>Choose from these visual classes:</p>
				5922
				5923	<pre class="text">
				5924	StaticGray
				5925	GrayScale
				5926	StaticColor
				5927	PseudoColor
				5928	TrueColor
				5929	DirectColor
				5930	default
				5931	visual id
				5932	</pre>
				5933
				5934	<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>
				5935
				5936
				5937	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5938	<h4><a id="watermark"></a>-watermark <em
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5939	class="arg">brightness</em>x<em class="arg">saturation</em></h4>
				5940	</div>
				5941
				5942	<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
				5943	saturation.</td><td style='text-align:right;'>[<a href="../www/composite.html">composite</a>]</td></tr></table>
				5944
				5945	<p>Take a grayscale image (with alpha mask) and modify the destination image's
				5946	brightness according to watermark image's grayscale value and the <em
				5947	class="arg">brightness</em> percentage. The destinations color saturation
				5948	attribute is just direct modified by the <em class="arg">saturation</em>
				5949	percentage, which defaults to 100 percent (no color change). </p>
				5950
				5951
				5952	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5953	<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]	5954	</div>
				5955
				5956	<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>
				5957
				5958	<p>Specify <em class="arg">amplitude</em> and <em class="arg">wavelength</em> of the wave.</p>
				5959
				5960	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5961	<h4><a id="weight"></a>-weight <em class="arg">fontWeight</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	5962	</div>
				5963
				5964	<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>
				5965
				5966	<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>
				5967
				5968	<table class="doc">
				5969	<col width="25%" />
				5970	<col width="75%" />
				5971	<thead>
				5972	<tr>
				5973	<th><em class="arg">fontWeight</em></th>
				5974	<th>Description</th>
				5975	</tr>
				5976	</thead>
				5977	<tbody>
				5978	<tr><td>All </td> <td>No effect. </td></tr>
				5979	<tr><td>Bold </td> <td>Same as <em class="arg">fontWeight</em> = 700.</td></tr>
				5980	<tr><td>Bolder </td> <td>Add 100 to font weight if currently ≤ 800.</td></tr>
				5981	<tr><td>Lighter </td> <td>Subtract 100 to font weight if currently ≤ 100.</td></tr>
				5982	<tr><td>Normal </td> <td>Same as <em class="arg">fontWeight</em> = 400.</td></tr>
				5983	</tbody>
				5984	</table>
				5985
				5986	<p>To print a complete list of weight types, use <a href="#list">-list weight</a>.</p>
				5987
				5988	<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>
				5989
				5990	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5991	<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]	5992	</div>
				5993
				5994	<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>
				5995
				5996	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	5997	<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]	5998	</div>
				5999
cristy	5cadd61	2009-09-21 19:33:41 +0000	[diff] [blame]	6000	<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>
				6001
				6002	<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.
				6003	</p>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	6004
				6005	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	6006	<h4><a id="window"></a>-window <em class="arg">id</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	6007	</div>
				6008
				6009	<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>
				6010
				6011	<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>
				6012
				6013	<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>
				6014
				6015	<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>
				6016
				6017	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	6018	<h4><a id="window-group"></a>-window-group</h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	6019	</div>
				6020
				6021	<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>
				6022
				6023	<div style="margin: auto;">
cristy	dcca3fa	2010-12-29 21:50:07 +0000	[diff] [blame]	6024	<h4><a id="write"></a>-write <em class="arg">filename</em></h4>
cristy	3ed852e	2009-09-05 21:47:34 +0000	[diff] [blame]	6025	</div>
				6026
				6027	<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>
				6028	<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>
				6029
				6030	<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]	6031	</div>
				6032	</div>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	6033
				6034	</div>
				6035
				6036	<div id="linkbar">
cristy	ce69bb0	2010-07-27 19:49:46 +0000	[diff] [blame]	6037	<span id="linkbar-west"> </span>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	6038	<span id="linkbar-center">
				6039	<a href="http://www.imagemagick.org/discourse-server/">Discourse Server</a> •
cristy	a890294	2010-07-30 00:49:52 +0000	[diff] [blame]	6040	<a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	6041	</span>
				6042	<span id="linkbar-east"> </span>
				6043	</div>
				6044	<div class="footer">
cristy	7e41fe8	2010-12-04 23:12:08 +0000	[diff] [blame]	6045	<span id="footer-west">© 1999-2011 ImageMagick Studio LLC</span>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	6046	<span id="footer-east"> <a href="http://www.imagemagick.org/script/contact.php">Contact the Wizards</a></span>
				6047	</div>
				6048	<div style="clear: both; margin: 0; width: 100%; "></div>
cristy	a890294	2010-07-30 00:49:52 +0000	[diff] [blame]	6049	<script type="text/javascript">
				6050	var _gaq = _gaq \|\| [];
				6051	_gaq.push(['_setAccount', 'UA-17690367-1']);
				6052	_gaq.push(['_trackPageview']);
				6053
				6054	(function() {
				6055	var ga = document.createElement('script'); ga.type = 'text/javascript'; ga.async = true;
				6056	ga.src = ('https:' == document.location.protocol ? 'https://ssl' : 'http://www') + '.google-analytics.com/ga.js';
				6057	var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(ga, s);
				6058	})();
				6059	</script>
cristy	3eaa0ef	2010-03-06 20:35:26 +0000	[diff] [blame]	6060	</body>
				6061	</html>