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

blob: edaa1b1e03d4fa625dbbfcf4c085830dc8aed2b7 [file] [log] [blame]

Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1
				2
				3
				4
cristy	29dc865	2015-05-12 16:26:21 +0000	[diff] [blame]	5	<!DOCTYPE html>
cristy	d243201	2015-05-04 23:15:15 +0000	[diff] [blame]	6	<html lang="en">
cristy	ad41c0c	2012-10-31 00:49:28 +0000	[diff] [blame]	7	<head>
Cristy	912a922	2016-06-17 15:37:28 -0400	[diff] [blame]	8	<meta charset="utf-8" />
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame^]	9	<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
				10	<meta http-equiv="x-ua-compatible" content="ie=edge" />
				11	<title>ImageMagick: Command-line Options</title>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	12	<meta http-equiv="content-type" content="text/html; charset=utf-8"/>
				13	<meta name="application-name" content="ImageMagick"/>
				14	<meta name="description" content="ImageMagick® is a software suite to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats (over 200) including PNG, JPEG, JPEG-2000, GIF, WebP, Postscript, PDF, and SVG. Use ImageMagick to resize, flip, mirror, rotate, distort, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves."/>
Cristy	364a72f	2016-11-04 22:38:41 -0400	[diff] [blame]	15	<meta name="application-url" content="https://www.imagemagick.org"/>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	16	<meta name="generator" content="PHP"/>
				17	<meta name="keywords" content="command-line, options, ImageMagick, PerlMagick, image processing, image, photo, software, Magick++, OpenMP, convert"/>
				18	<meta name="rating" content="GENERAL"/>
				19	<meta name="robots" content="INDEX, FOLLOW"/>
				20	<meta name="generator" content="ImageMagick Studio LLC"/>
				21	<meta name="author" content="ImageMagick Studio LLC"/>
				22	<meta name="revisit-after" content="2 DAYS"/>
				23	<meta name="resource-type" content="document"/>
Cristy	912a922	2016-06-17 15:37:28 -0400	[diff] [blame]	24	<meta name="copyright" content="Copyright (c) 1999-2016 ImageMagick Studio LLC"/>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	25	<meta name="distribution" content="Global"/>
				26	<meta name="magick-serial" content="P131-S030410-R485315270133-P82224-A6668-G1245-1"/>
Cristy	912a922	2016-06-17 15:37:28 -0400	[diff] [blame]	27	<meta name="google-site-verification" content="_bMOCDpkx9ZAzBwb2kF3PRHbfUUdFj2uO8Jd1AXArz4" />
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame^]	28	<link rel="canonical" href="command-line-options.html?"/>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	29	<link rel="icon" href="../images/wand.png"/>
				30	<link rel="shortcut icon" href="../images/wand.ico"/>
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame^]	31	<link rel="stylesheet" type="text/css" href="https://fonts.googleapis.com/css?family=Roboto:900,400,400italic,700,700italic,300,300italic\|Open+Sans:300italic,400italic,700italic,300,400,600,700">
Cristy	ce4a355	2015-12-14 13:53:35 -0500	[diff] [blame]	32	<link rel="stylesheet" href="css/magick.css"/>
cristy	ad41c0c	2012-10-31 00:49:28 +0000	[diff] [blame]	33	</head>
cristy	d243201	2015-05-04 23:15:15 +0000	[diff] [blame]	34	<body>
cristy	ad41c0c	2012-10-31 00:49:28 +0000	[diff] [blame]	35	<div class="main">
cristy	d243201	2015-05-04 23:15:15 +0000	[diff] [blame]	36	<div class="magick-masthead">
				37	<div class="container">
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame^]	38	<script async="async" src="https://localhost/pagead/js/adsbygoogle.js"></script> <ins class="adsbygoogle"
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	39	style="display:block"
				40	data-ad-client="ca-pub-3129977114552745"
				41	data-ad-slot="6345125851"
				42	data-ad-format="auto"></ins>
cristy	29f2c97	2015-07-28 13:37:46 +0000	[diff] [blame]	43	<script>
Cristy	542697a	2015-10-12 20:10:32 -0400	[diff] [blame]	44	(adsbygoogle = window.adsbygoogle \|\| []).push({});
cristy	d243201	2015-05-04 23:15:15 +0000	[diff] [blame]	45	</script>
cristy	d243201	2015-05-04 23:15:15 +0000	[diff] [blame]	46	<nav class="magick-nav">
cristy	44443b9	2015-05-05 00:06:07 +0000	[diff] [blame]	47	<a class="magick-nav-item " href="../index.html">Home</a>
cristy	ea2793e	2015-05-31 16:52:26 +0000	[diff] [blame]	48	<a class="magick-nav-item " href="binary-releases.html">Download</a>
cristy	d243201	2015-05-04 23:15:15 +0000	[diff] [blame]	49	<a class="magick-nav-item " href="command-line-tools.html">Tools</a>
Cristy	e93be68	2015-11-26 09:07:51 -0500	[diff] [blame]	50	<a class="magick-nav-item " href="command-line-processing.html">Command-line</a>
cristy	ea2793e	2015-05-31 16:52:26 +0000	[diff] [blame]	51	<a class="magick-nav-item " href="resources.html">Resources</a>
				52	<a class="magick-nav-item " href="api.html">Develop</a>
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame^]	53	<a class="magick-nav-item " href="http://www.imagemagick.org/script/search.php">Search</a>
				54	<a class="magick-nav-item pull-right" href="http://www.imagemagick.org/discourse-server/">Community</a>
cristy	d243201	2015-05-04 23:15:15 +0000	[diff] [blame]	55	</nav>
				56	</div>
				57	</div>
				58	<div class="container">
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	59	<div class="magick-header">
Cristy	e077971	2016-07-30 17:25:22 -0400	[diff] [blame]	60	<p class="text-center"><a href="command-line-options.html#adaptive-blur">‑adaptive‑blur</a> • <a href="command-line-options.html#adaptive-resize">‑adaptive‑resize</a> • <a href="command-line-options.html#adaptive-sharpen">‑adaptive‑sharpen</a> • <a href="command-line-options.html#adjoin">‑adjoin</a> • <a href="command-line-options.html#affine">‑affine</a> • <a href="command-line-options.html#alpha">‑alpha</a> • <a href="command-line-options.html#alpha-color">‑alpha‑color</a> • <a href="command-line-options.html#annotate">‑annotate</a> • <a href="command-line-options.html#antialias">‑antialias</a> • <a href="command-line-options.html#append">‑append</a> • <a href="command-line-options.html#attenuate">‑attenuate</a> • <a href="command-line-options.html#authenticate">‑authenticate</a> • <a href="command-line-options.html#auto-gamma">‑auto‑gamma</a> • <a href="command-line-options.html#auto-level">‑auto‑level</a> • <a href="command-line-options.html#auto-orient">‑auto‑orient</a> • <a href="command-line-options.html#backdrop">‑backdrop</a> • <a href="command-line-options.html#background">‑background</a> • <a href="command-line-options.html#bench">‑bench</a> • <a href="command-line-options.html#bias">‑bias</a> • <a href="command-line-options.html#black-point-compensation">‑black‑point‑compensation</a> • <a href="command-line-options.html#black-threshold">‑black‑threshold</a> • <a href="command-line-options.html#blend">‑blend</a> • <a href="command-line-options.html#blue-primary">‑blue‑primary</a> • <a href="command-line-options.html#blue-shift">‑blue‑shift</a> • <a href="command-line-options.html#blur">‑blur</a> • <a href="command-line-options.html#border">‑border</a> • <a href="command-line-options.html#bordercolor">‑bordercolor</a> • <a href="command-line-options.html#borderwidth">‑borderwidth</a> • <a href="command-line-options.html#brightness-contrast">‑brightness‑contrast</a> • <a href="command-line-options.html#cache">‑cache</a> • <a href="command-line-options.html#canny">‑canny</a> • <a href="command-line-options.html#caption">‑caption</a> • <a href="command-line-options.html#cdl">‑cdl</a> • <a href="command-line-options.html#channel">‑channel</a> • <a href="command-line-options.html#charcoal">‑charcoal</a> • <a href="command-line-options.html#chop">‑chop</a> • <a href="command-line-options.html#clamp">‑clamp</a> • <a href="command-line-options.html#clip">‑clip</a> • <a href="command-line-options.html#clip-mask">‑clip‑mask</a> • <a href="command-line-options.html#clip-path">‑clip‑path</a> • <a href="command-line-options.html#clone">‑clone</a> • <a href="command-line-options.html#clut">‑clut</a> • <a href="command-line-options.html#coalesce">‑coalesce</a> • <a href="command-line-options.html#colorize">‑colorize</a> • <a href="command-line-options.html#colormap">‑colormap</a> • <a href="command-line-options.html#color-matrix">‑color‑matrix</a> • <a href="command-line-options.html#colors">‑colors</a> • <a href="command-line-options.html#colorspace">‑colorspace</a> • <a href="command-line-options.html#combine">‑combine</a> • <a href="command-line-options.html#comment">‑comment</a> • <a href="command-line-options.html#compare">‑compare</a> • <a href="command-line-options.html#complex">‑complex</a> • <a href="command-line-options.html#compose">‑compose</a> • <a href="command-line-options.html#composite">‑composite</a> • <a href="command-line-options.html#compress">‑compress</a> • <a href="command-line-options.html#connected-components">‑connected‑components</a> • <a href="command-line-options.html#contrast">‑contrast</a> • <a href="command-line-options.html#contrast-stretch">‑contrast‑stretch</a> • <a href="command-line-options.html#convolve">‑convolve</a> • <a href="command-line-options.html#copy">‑copy</a> • <a href="command-line-options.html#crop">‑crop</a> • <a href="command-line-options.html#cycle">‑cycle</a> • <a href="command-line-options.html#debug">‑debug</a> • <a href="command-line-options.html#decipher">‑decipher</a> • <a href="command-line-options.html#deconstruct">‑deconstruct</a> • <a href="command-line-options.html#define">‑define</a> • <a href="command-line-options.html#delay">‑delay</a> • <a href="command-line-options.html#delete">‑delete</a> • <a href="command-line-options.html#density">‑density</a> • <a href="command-line-options.html#depth">‑depth</a> • <a href="command-line-options.html#descend">‑descend</a> • <a href="command-line-options.html#deskew">‑deskew</a> • <a href="command-line-options.html#despeckle">‑despeckle</a> • <a href="command-line-options.html#direction">‑direction</a> • <a href="command-line-options.html#displace">‑displace</a> • <a href="command-line-options.html#display">‑display</a> • <a href="command-line-options.html#dispose">‑dispose</a> • <a href="command-line-options.html#dissimilarity-threshold">‑dissimilarity‑threshold</a> • <a href="command-line-options.html#dissolve">‑dissolve</a> • <a href="command-line-options.html#distort">‑distort</a> • <a href="command-line-options.html#distribute-cache">‑distribute‑cache</a> • <a href="command-line-options.html#dither">‑dither</a> • <a href="command-line-options.html#draw">‑draw</a> • <a href="command-line-options.html#duplicate">‑duplicate</a> • <a href="command-line-options.html#edge">‑edge</a> • <a href="command-line-options.html#emboss">‑emboss</a> • <a href="command-line-options.html#encipher">‑encipher</a> • <a href="command-line-options.html#encoding">‑encoding</a> • <a href="command-line-options.html#endian">‑endian</a> • <a href="command-line-options.html#enhance">‑enhance</a> • <a href="command-line-options.html#equalize">‑equalize</a> • <a href="command-line-options.html#evaluate">‑evaluate</a> • <a href="command-line-options.html#evaluate-sequence">‑evaluate‑sequence</a> • <a href="command-line-options.html#extent">‑extent</a> • <a href="command-line-options.html#extract">‑extract</a> • <a href="command-line-options.html#family">‑family</a> • <a href="command-line-options.html#features">‑features</a> • <a href="command-line-options.html#fft">‑fft</a> • <a href="command-line-options.html#fill">‑fill</a> • <a href="command-line-options.html#filter">‑filter</a> • <a href="command-line-options.html#flatten">‑flatten</a> • <a href="command-line-options.html#flip">‑flip</a> • <a href="command-line-options.html#floodfill">‑floodfill</a> • <a href="command-line-options.html#flop">‑flop</a> • <a href="command-line-options.html#font">‑font</a> • <a href="command-line-options.html#foreground">‑foreground</a> • <a href="command-line-options.html#format">‑format</a> • <a href="command-line-options.html#format_identify_">‑format[identify]</a> • <a href="command-line-options.html#frame">‑frame</a> • <a href="command-line-options.html#frame_import_">‑frame[import]</a> • <a href="command-line-options.html#function">‑function</a> • <a href="command-line-options.html#fuzz">‑fuzz</a> • <a href="command-line-options.html#fx">‑fx</a> • <a href="command-line-options.html#gamma">‑gamma</a> • <a href="command-line-options.html#gaussian-blur">‑gaussian‑blur</a> • <a href="command-line-options.html#geometry">‑geometry</a> • <a href="command-line-options.html#gravity">‑gravity</a> • <a href="command-line-options.html#grayscale">‑grayscale</a> • <a href="command-line-options.html#green-primary">‑green‑primary</a> • <a href="command-line-options.html#hald-clut">‑hald‑clut</a> • <a href="command-line-options.html#help">‑help</a> • <a href="command-line-options.html#highlight-color">‑highlight‑color</a> • <a href="command-line-options.html#hough-lines">‑hough‑lines</a> • <a href="command-line-options.html#iconGeometry">‑iconGeometry</a> • <a href="command-line-options.html#iconic">‑iconic</a> • <a href="command-line-options.html#identify">‑identify</a> • <a href="command-line-options.html#ift">‑ift</a> • <a href="command-line-options.html#immutable">‑immutable</a> • <a href="command-line-options.html#implode">‑implode</a> • <a href="command-line-options.html#insert">‑insert</a> • <a href="command-line-options.html#intensity">‑intensity</a> • <a href="command-line-options.html#intent">‑intent</a> • <a href="command-line-options.html#interlace">‑interlace</a> • <a href="command-line-options.html#interpolate">‑interpolate</a> • <a href="command-line-options.html#interline-spacing">‑interline‑spacing</a> • <a href="command-line-options.html#interword-spacing">‑interword‑spacing</a> • <a href="command-line-options.html#kerning">‑kerning</a> • <a href="command-line-options.html#kuwahara">‑kuwahara</a> • <a href="command-line-options.html#label">‑label</a> • <a href="command-line-options.html#lat">‑lat</a> • <a href="command-line-options.html#layers">‑layers</a> • <a href="command-line-options.html#level">‑level</a> • <a href="command-line-options.html#level-colors">‑level‑colors</a> • <a href="command-line-options.html#limit">‑limit</a> • <a href="command-line-options.html#linear-stretch">‑linear‑stretch</a> • <a href="command-line-options.html#linewidth">‑linewidth</a> • <a href="command-line-options.html#liquid-rescale">‑liquid‑rescale</a> • <a href="command-line-options.html#list">‑list</a> • <a href="command-line-options.html#log">‑log</a> • <a href="command-line-options.html#loop">‑loop</a> • <a href="command-line-options.html#lowlight-color">‑lowlight‑color</a> • <a href="command-line-options.html#magnify">‑magnify</a> • <a href="command-line-options.html#map">‑map</a> • <a href="command-line-options.html#map_stream_">‑map[stream]</a> • <a href="command-line-options.html#mattecolor">‑mattecolor</a> • <a href="command-line-options.html#median">‑median</a> • <a href="command-line-options.html#mean-shift">‑mean‑shift</a> • <a href="command-line-options.html#metric">‑metric</a> • <a href="command-line-options.html#mode">‑mode</a> • <a href="command-line-options.html#modulate">‑modulate</a> • <a href="command-line-options.html#moments">‑moments</a> • <a href="command-line-options.html#monitor">‑monitor</a> • <a href="command-line-options.html#monochrome">‑monochrome</a> • <a href="command-line-options.html#morph">‑morph</a> • <a href="command-line-options.html#morphology">‑morphology</a> • <a href="command-line-options.html#mosaic">‑mosaic</a> • <a href="command-line-options.html#motion-blur">‑motion‑blur</a> • <a href="command-line-options.html#name">‑name</a> • <a href="command-line-options.html#negate">‑negate</a> • <a href="command-line-options.html#noise">‑noise</a> • <a href="command-line-options.html#normalize">‑normalize</a> • <a href="command-line-options.html#opaque">‑opaque</a> • <a href="command-line-options.html#ordered-dither">‑ordered‑dither</a> • <a href="command-line-options.html#orient">‑orient</a> • <a href="command-line-options.html#page">‑page</a> • <a href="command-line-options.html#paint">‑paint</a> • <a href="command-line-options.html#path">‑path</a> • <a href="command-line-options.html#pause_animate_">‑pause[animate]</a> • <a href="command-line-options.html#pause_import_">‑pause[import]</a> • <a href="command-line-options.html#perceptible">‑perceptible</a> • <a href="command-line-options.html#ping">‑ping</a> • <a href="command-line-options.html#pointsize">‑pointsize</a> • <a href="command-line-options.html#polaroid">‑polaroid</a> • <a href="command-line-options.html#poly">‑poly</a> • <a href="command-line-options.html#posterize">‑posterize</a> • <a href="command-line-options.html#precision">‑precision</a> • <a href="command-line-options.html#preview">‑preview</a> • <a href="command-line-options.html#print">‑print</a> • <a href="command-line-options.html#process">‑process</a> • <a href="command-line-options.html#profile">‑profile</a> • <a href="command-line-options.html#quality">‑quality</a> • <a href="command-line-options.html#quantize">‑quantize</a> • <a href="command-line-options.html#quiet">‑quiet</a> • <a href="command-line-options.html#radial-blur">‑radial‑blur</a> • <a href="command-line-options.html#raise">‑raise</a> • <a href="command-line-options.html#random-threshold">‑random‑threshold</a> • <a href="command-line-options.html#read-mask">‑read‑mask</a> • <a href="command-line-options.html#red-primary">‑red‑primary</a> • <a href="command-line-options.html#regard-warnings">‑regard‑warnings</a> • <a href="command-line-options.html#region">‑region</a> • <a href="command-line-options.html#remap">‑remap</a> • <a href="command-line-options.html#remote">‑remote</a> • <a href="command-line-options.html#render">‑render</a> • <a href="command-line-options.html#repage">‑repage</a> • <a href="command-line-options.html#resample">‑resample</a> • <a href="command-line-options.html#resize">‑resize</a> • <a href="command-line-options.html#respect-parentheses">‑respect‑parentheses</a> • <a href="command-line-options.html#reverse">‑reverse</a> • <a href="command-line-options.html#roll">‑roll</a> • <a href="command-line-options.html#rotate">‑rotate</a> • <a href="command-line-options.html#sample">‑sample</a> • <a href="command-line-options.html#sampling-factor">‑sampling‑factor</a> • <a href="command-line-options.html#scale">‑scale</a> • <a href="command-line-options.html#scene">‑scene</a> • <a href="command-line-options.html#screen">‑screen</a> • <a href="command-line-options.html#seed">‑seed</a> • <a href="command-line-options.html#segment">‑segment</a> • <a href="command-line-options.html#selective-blur">‑selective‑blur</a> • <a href="command-line-options.html#separate">‑separate</a> • <a href="command-line-options.html#sepia-tone">‑sepia‑tone</a> • <a href="command-line-options.html#set">‑set</a> • <a href="command-line-options.html#shade">‑shade</a> • <a href="command-line-options.html#shadow">‑shadow</a> • <a href="command-line-options.html#shared-memory">‑shared‑memory</a> • <a href="command-line-options.html#sharpen">‑sharpen</a> • <a href="command-line-options.html#shave">‑shave</a> • <a href="command-line-options.html#shear">‑shear</a> • <a href="command-line-options.html#sigmoidal-contrast">‑sigmoidal‑contrast</a> • <a href="command-line-options.html#silent">‑silent</a> • <a href="command-line-options.html#similarity-threshold">‑similarity‑threshold</a> • <a href="command-line-options.html#size">‑size</a> • <a href="command-line-options.html#sketch">‑sketch</a> • <a href="command-line-options.html#smush">‑smush</a> • <a href="command-line-options.html#snaps">‑snaps</a> • <a href="command-line-options.html#solarize">‑solarize</a> • <a href="command-line-options.html#sparse-color">‑sparse‑color</a> • <a href="command-line-options.html#splice">‑splice</a> • <a href="command-line-options.html#spread">‑spread</a> • <a href="command-line-options.html#statistic">‑statistic</a> • <a href="command-line-options.html#stegano">‑stegano</a> • <a href="command-line-options.html#stereo">‑stereo</a> • <a href="command-line-options.html#storage-type">‑storage‑type</a> • <a href="command-line-options.html#stretch">‑stretch</a> • <a href="command-line-options.html#strip">‑strip</a> • <a href="command-line-options.html#stroke">‑stroke</a> • <a href="command-line-options.html#strokewidth">‑strokewidth</a> • <a href="command-line-options.html#style">‑style</a> • <a href="command-line-options.html#subimage-search">‑subimage‑search</a> • <a href="command-line-options.html#swap">‑swap</a> • <a href="command-line-options.html#swirl">‑swirl</a> • <a href="command-line-options.html#synchronize">‑synchronize</a> • <a href="command-line-options.html#taint">‑taint</a> • <a href="command-line-options.html#text-font">‑text‑font</a> • <a href="command-line-options.html#texture">‑texture</a> • <a href="command-line-options.html#threshold">‑threshold</a> • <a href="command-line-options.html#thumbnail">‑thumbnail</a> • <a href="command-line-options.html#tile">‑tile</a> • <a href="command-line-options.html#tile-offset">‑tile‑offset</a> • <a href="command-line-options.html#tint">‑tint</a> • <a href="command-line-options.html#title">‑title</a> • <a href="command-line-options.html#transform">‑transform</a> • <a href="command-line-options.html#transparent">‑transparent</a> • <a href="command-line-options.html#transparent-color">‑transparent‑color</a> • <a href="command-line-options.html#transpose">‑transpose</a> • <a href="command-line-options.html#transverse">‑transverse</a> • <a href="command-line-options.html#treedepth">‑treedepth</a> • <a href="command-line-options.html#trim">‑trim</a> • <a href="command-line-options.html#type">‑type</a> • <a href="command-line-options.html#undercolor">‑undercolor</a> • <a href="command-line-options.html#unique-colors">‑unique‑colors</a> • <a href="command-line-options.html#units">‑units</a> • <a href="command-line-options.html#unsharp">‑unsharp</a> • <a href="command-line-options.html#update">‑update</a> • <a href="command-line-options.html#verbose">‑verbose</a> • <a href="command-line-options.html#version">‑version</a> • <a href="command-line-options.html#view">‑view</a> • <a href="command-line-options.html#vignette">‑vignette</a> • <a href="command-line-options.html#virtual-pixel">‑virtual‑pixel</a> • <a href="command-line-options.html#visual">‑visual</a> • <a href="command-line-options.html#watermark">‑watermark</a> • <a href="command-line-options.html#wave">‑wave</a> • <a href="command-line-options.html#wavelet-denoise">‑wavelet‑denoise</a> • <a href="command-line-options.html#weight">‑weight</a> • <a href="command-line-options.html#white-point">‑white‑point</a> • <a href="command-line-options.html#white-threshold">‑white‑threshold</a> • <a href="command-line-options.html#window">‑window</a> • <a href="command-line-options.html#window-group">‑window‑group</a> • <a href="command-line-options.html#write">‑write</a> • <a href="command-line-options.html#write-mask">‑write‑mask</a> </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	61
				62	<p class="lead magick-description">Below is list of command-line options recognized by the ImageMagick <a href="command-line-tools.html">command-line tools</a>. If you want a description of a particular option, click on the option name in the navigation bar above and you will go right to it. Unless otherwise noted, each option is recognized by the commands: <a href="convert.html">convert</a> and <a href="mogrify.html">mogrify</a>.</p>
				63
				64	<div style="margin: auto;">
				65	<h3 class="magick-header"><a id="adaptive-blur"></a>-adaptive-blur <var>radius</var>[x<var>sigma</var>]</h3>
				66	</div>
				67
				68	<p class="magick-description">Adaptively blur pixels, with decreasing effect near edges.</p>
				69
				70	<p>A Gaussian operator of the given radius and standard deviation (<var>sigma</var>) is used. If <var>sigma</var> is not given it
				71	defaults to 1.</p>
				72
				73	<div style="margin: auto;">
				74	<h3 class="magick-header"><a id="adaptive-resize"></a>-adaptive-resize <var>geometry</var></h3>
				75	</div>
				76
				77	<p class="magick-description">Resize the image using data-dependent triangulation.</p>
				78
				79	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument. The <a href="command-line-options.html#adaptive-resize">-adaptive-resize</a>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	80	option defaults to data-dependent triangulation. Use the <a
				81	href="command-line-options.html#filter">-filter</a> to choose a different resampling algorithm.
				82	Offsets, if present in the geometry string, are ignored, and the <a
				83	href="command-line-options.html#gravity">-gravity</a> option has no effect.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	84
				85	<div style="margin: auto;">
				86	<h3 class="magick-header"><a id="adaptive-sharpen"></a>-adaptive-sharpen <var>radius</var>[x<var>sigma</var>]</h3>
				87	</div>
				88
				89	<p class="magick-description">Adaptively sharpen pixels, with increasing effect near edges.</p>
				90
				91	<p>A Gaussian operator of the given radius and standard deviation
				92	(<var>sigma</var>) is used. If <var>sigma</var> is not given it
				93	defaults to 1.</p>
				94
				95	<div style="margin: auto;">
				96	<h3 class="magick-header"><a id="adjoin"></a>-adjoin</h3>
				97	</div>
				98
				99	<p class="magick-description">Join images into a single multi-image file.</p>
				100
				101	<p>This option is enabled by default. An attempt is made to save all images of
				102	an image sequence into the given output file. However, some formats, such as
				103	JPEG and PNG, do not support more than one image per file, and in that case
				104	ImageMagick is forced to write each image as a separate file. As such, if
				105	more than one image needs to be written, the filename given is modified by
				106	adding a <a href="command-line-options.html#scene">-scene</a> number before the suffix, in order to
				107	make distinct names for each image. </p>
				108
				109	<p>Use <a href="command-line-options.html#adjoin">+adjoin</a> to force each image to be written to
				110	separate files, whether or not the file format allows multiple images per file
				111	(for example, GIF, MIFF, and TIFF). </p>
				112
				113	<p>Including a C-style integer format string in the output filename will
				114	automagically enable <a href="command-line-options.html#adjoin">+adjoin</a> and are used to specify
				115	where the <a href="command-line-options.html#scene">-scene</a> number is placed in the filenames. These
				116	strings, such as '<code>%d</code>' or '<code>%03d</code>', are familiar to those
				117	who have used the standard <code>printf()</code>' C-library function. As an
				118	example, the command</p>
				119
				120	<pre>
				121	convert logo: rose: -morph 15 my%02dmorph.jpg
				122	</pre>
				123
				124	<p>will create a sequence of 17 images (the two given plus 15 more created by
				125	<a href="command-line-options.html#morph">-morph</a>), named: my00morph.jpg, my01morph.jpg,
				126	my02morph.jpg, ..., my16morph.jpg. </p>
				127
				128	<p>In summary, ImageMagick tries to write all images to one file, but will
				129	save to multiple files, if any of the following conditions exist...</p>
				130	<ol>
				131	<li>the output image's file format does not allow multi-image files,</li>
				132	<li>the <a href="command-line-options.html#adjoin">+adjoin</a> option is given, or</li>
				133	<li>a printf() integer format string (eg: "%d") is present in the output
				134	filename.</li>
				135	</ol>
				136
				137
				138	<div style="margin: auto;">
				139	<h3 class="magick-header"><a id="affine"></a>-affine
				140	<var>s<sub>x</sub></var>,<var>r<sub>x</sub></var>,<var>r<sub>y</sub></var>,<var>s<sub>y</sub></var>[,<var>t<sub>x</sub></var>,<var>t<sub>y</sub></var>]</h3>
				141	</div>
				142
				143	<p class="magick-description">Set the drawing transformation matrix for combined rotating and scaling.</p>
				144
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	145	<p>This option sets a transformation matrix, for use by subsequent <a
				146	href="command-line-options.html#draw">-draw</a> or <a href="command-line-options.html#transform">-transform</a> options. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	147
				148	<p>The matrix entries are entered as comma-separated numeric values either in
				149	quotes or without spaces. </p>
				150
				151	<p>Internally, the transformation matrix has 3x3 elements, but three of them
				152	are omitted from the input because they are constant. The new (transformed)
				153	coordinates (<var>x'</var>, <var>y'</var>) of a pixel at
				154	position (<var>x</var>, <var>y</var>) in the original
				155	image are calculated using the following matrix equation.</p>
				156
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	157	<p class="text-center"><img class="img-thumbnail" alt="affine transformation" src="../images/affine.png"/> </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	158
				159	<p> The size of the resulting image is that of the smallest rectangle that
				160	contains the transformed source image. The parameters
				161	<var>t<sub>x</sub></var> and <var>t<sub>y</sub></var>
				162	subsequently shift the image pixels so that those that are moved out of the
				163	image area are cut off.</p>
				164
				165	<p>The transformation matrix complies with the left-handed pixel coordinate
				166	system: positive <var>x</var> and <var>y</var> directions
				167	are rightward and downward, resp.; positive rotation is clockwise.</p>
				168
				169	<p> If the translation coefficients <var>t<sub>x</sub></var> and
				170	<var>t<sub>y</sub></var> are omitted they default to 0,0. Therefore,
				171	four parameters suffice for rotation and scaling without translation.</p>
				172
				173	<p>Scaling by the factors <var>s<sub>x</sub></var> and
				174	<var>s<sub>y</sub></var> in the <var>x</var> and <var>y</var> directions,
				175	respectively, is accomplished with the following.</p>
				176
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	177	<p>See <a href="command-line-options.html#transform">-transform</a>, and the <a
				178	href="command-line-options.html#distort">-distort</a> method '<code>Affineprojection</code> for more
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	179	information </p>
				180
				181
				182	<pre>
				183	-affine <var>s<sub>x</sub></var>,0,0,<var>s<sub>y</sub></var>
				184	</pre>
				185
				186	<p>Translation by a displacement (<var>t<sub>x</sub></var>, <var>t<sub>y</sub></var>) is accomplished like so:</p>
				187
				188	<pre>
				189	-affine 1,0,0,1,<var>t<sub>x</sub></var>,<var>t<sub>y</sub></var>
				190	</pre>
				191
				192	<p>Rotate clockwise about the origin (the upper left-hand corner) by an angle
				193	<var>a</var> by letting <var>c</var> = cos(<var>a</var>), <var>s</var>
				194	= sin(<var>a</var>), and using the following.</p>
				195
				196	<pre>
				197	-affine <var>c</var>,<var>s</var>,-<var>s</var>,<var>c</var>
				198	</pre>
				199
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	200	<p>The cumulative effect of a sequence of <a href="command-line-options.html#affine" >-affine</a>
				201	transformations can be accomplished by instead by a single <a href="command-line-options.html#affine"
				202	>-affine</a> operation using the matrix equal to the product of the matrices
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	203	of the individual transformations.</p>
				204
				205	<p>An attempt is made to detect near-singular transformation matrices. If the
				206	matrix determinant has a sufficiently small absolute value it is rejected.</p>
				207
				208	<div style="margin: auto;">
				209	<h3 class="magick-header"><a id="alpha"></a>-alpha <var>type</var></h3>
				210	</div>
				211
				212	<p class="magick-description">Gives control of the alpha/matte channel of an image.</p>
				213
				214	<p>Used to set a flag on an image indicating whether or not to use existing alpha
				215	channel data, to create an alpha channel, or to perform other operations on the alpha channel. Choose the argument <var>type</var> from the list below.</p>
				216
				217	<dl class="dl-horizontal">
				218	<dt>Activate</dt>
				219	<dd>
				220	Enable the image's transparency channel. Note normally Set
				221	should be used instead of this, unless you specifically need to
				222	preserve existing (but specifically turned Off) transparency
				223	channel. </dd>
				224
				225	<dt>Associate</dt>
				226	<dd>
				227	associate the alpha channel with the image.</dd>
				228
				229	<dt>Deactivate</dt>
				230	<dd>
				231	Disables the image's transparency channel. Does not delete or change the
				232	existing data, just turns off the use of that data.</dd>
				233
				234	<dt>Disassociate</dt>
				235	<dd>
				236	disassociate the alpha channel from the image.</dd>
				237
				238	<dt>Set</dt>
				239	<dd>
				240	Activates the alpha/matte channel. If it was previously turned off
				241	then it also resets the channel to opaque. If the image already had
				242	the alpha channel turned on, it will have no effect.</dd>
				243
				244	<dt>Opaque</dt>
				245	<dd>
				246	Enables the alpha/matte channel and forces it to be fully opaque.
				247	</dd>
				248
				249	<dt>Transparent</dt>
				250	<dd>
				251	Activates the alpha/matte channel and forces it to be fully
				252	transparent. This effectively creates a fully transparent image the
				253	same size as the original and with all its original RGB data still
				254	intact, but fully transparent. </dd>
				255
				256	<dt>Extract</dt>
				257	<dd>
				258	Copies the alpha channel values into all the color channels and turns
				259	'Off' the the image's transparency, so as to generate
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	260	a grayscale mask of the image's shape. The alpha channel data is left
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	261	intact just deactivated. This is the inverse of 'Copy'.
				262	</dd>
				263
				264	<dt>Copy</dt>
				265	<dd>
				266	Turns 'On' the alpha/matte channel, then copies the
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	267	grayscale intensity of the image, into the alpha channel, converting
				268	a grayscale mask into a transparent shaped mask ready to be colored
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	269	appropriately. The color channels are not modified. </dd>
				270
				271	<dt>Shape</dt>
				272	<dd>
				273	As per 'Copy' but also colors the resulting shape mask with
				274	the current background color. That is the RGB color channels is
				275	replaced, with appropriate alpha shape.
				276	</dd>
				277
				278	<dt>Remove</dt>
				279	<dd>
				280	Composite the image over the background color.
				281	</dd>
				282
				283	<dt>Background</dt>
				284	<dd>
				285	Set any fully-transparent pixel to the background color, while leaving
				286	it fully-transparent. This can make some image file formats, such as
				287	PNG, smaller as the RGB values of transparent pixels are more uniform,
				288	and thus can compress better.
				289	</dd>
				290	</dl>
				291
				292	<p>Note that while the obsolete <code>+matte</code> operation was the
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	293	same as "<code><a href="command-line-options.html#alpha" >-alpha</a> Off</code>", the <code>
				294	>-matte</code> operation was the same as "<code><a href="command-line-options.html#alpha" >-alpha</a>
				295	Set</code>" and not "<code><a href="command-line-options.html#alpha" >-alpha</a> On</code>". </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	296
Cristy	f650f4f	2016-04-01 10:53:07 -0400	[diff] [blame]	297	<div style="margin: auto;">
				298	<h3 class="magick-header"><a id="alpha-color"></a>-alpha-color <var>color</var></h3>
				299	</div>
				300
				301	<p class="magick-description">Specify the color to be used with the <a href="command-line-options.html#frame">-frame</a> option.</p>
				302
				303	<p>The color is specified using the format described under the <a href="command-line-options.html#fill">-fill</a> option.</p>
				304
				305	<p>The default matte color is <code>#BDBDBD</code>, <span
				306	style="background-color: #bdbdbd;">this shade of gray</span>.</p>
				307
				308	<p>This is an IMv7 option, use <a href="command-line-options.html#mattecolor">mattecolor</a> with IMv6.</p>
				309
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	310
				311	<div style="margin: auto;">
				312	<h3 class="magick-header"><a id="annotate"></a>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	313	-annotate <var>degrees</var> <var>text</var><br />
				314	-annotate <var>Xdegrees</var>x<var>Ydegrees</var> <var>text</var><br /> -annotate <var>Xdegrees</var>x<var>Ydegrees</var> {+-}<var>t<sub>x</sub></var>{+-}<var>t<sub>y</sub></var> <var>text</var><br /> -annotate {+-}<var>t<sub>x</sub></var>{+-}<var>t<sub>y</sub></var> <var>text</var></h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	315	</div>
				316
				317	<p class="magick-description">Annotate an image with text</p>
				318
				319	<p>This is a convenience for annotating an image with text. For more precise
				320	control over text annotations, use <a href="command-line-options.html#draw">-draw</a>.</p>
				321
				322
				323	<p>The values <var>Xdegrees</var> and <var>Ydegrees</var>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	324	control the shears applied to the text, while <var>t<sub>x</sub></var> and <var>t<sub>y</sub></var> are offsets that give the location of the text relative any <a href="command-line-options.html#gravity" >-gravity</a> setting and defaults to the upper left corner of the image.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	325
				326	<p>Using <a href="command-line-options.html#annotate">-annotate</a> <var>degrees</var>
				327	or <a href="command-line-options.html#annotate">-annotate</a> <var>degrees</var>x<var>degrees</var> produces an unsheared rotation of the text. The
				328	direction of the rotation is positive, which means a clockwise rotation if <var>degrees</var> is positive. (This conforms to the usual mathematical
				329	convention once it is realized that the positive <var>y</var>–direction is
				330	conventionally considered to be <var>downward</var> for images.)</p>
				331
				332	<p>The new (transformed) coordinates (<var>x'</var>, <var>y'</var>) of a pixel at position (<var>x</var>, <var>y</var>) in the image are calculated using the following matrix
				333	equation.</p>
				334
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	335	<p class="text-center"><img class="img-thumbnail" alt="annotate transformation" src="../images/annotate.png"/></p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	336
				337	<p>If <var>t<sub>x</sub></var> and <var>t<sub>y</sub></var> are omitted, they default to 0. This makes the
				338	bottom-left of the text becomes the upper-left corner of the image, which is
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	339	probably undesirable. Adding a <a href="command-line-options.html#gravity" >-gravity</a> option in this
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	340	case leads to nice results.</p>
				341
				342	<p>Text is any UTF-8 encoded character sequence. If <var>text</var>
				343	is of the form '@mytext.txt', the text is read from the file
				344	<code>mytext.txt</code>. Text in a file is taken literally; no embedded
				345	formatting characters are recognized.</p>
				346
				347	<div style="margin: auto;">
				348	<h3 class="magick-header"><a id="antialias"></a>-antialias</h3>
				349	</div>
				350
				351	<p class="magick-description">Enable/Disable of the rendering of anti-aliasing pixels when drawing fonts and lines.</p>
				352
				353	<p>By default, objects (e.g. text, lines, polygons, etc.) are antialiased when
				354	drawn. Use <a href="command-line-options.html#antialias">+antialias</a> to disable the addition of
				355	antialiasing edge pixels. This will then reduce the number of colors added to
				356	an image to just the colors being directly drawn. That is, no mixed colors
				357	are added when drawing such objects. </p>
				358
				359	<div style="margin: auto;">
				360	<h3 class="magick-header"><a id="append"></a>-append</h3>
				361	</div>
				362
				363	<p class="magick-description">Join current images vertically or horizontally.</p>
				364
				365	<p>This option creates a single longer image, by joining all the current
				366	images in sequence top-to-bottom. Use <a href="command-line-options.html#append">+append</a> to
				367	stack images left-to-right. </p>
				368
				369	<p>If they are not of the same width, narrower images are padded with the
				370	current <a href="command-line-options.html#background">-background</a> color setting, and their
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	371	position relative to each other can be controlled by the current <a
				372	href="command-line-options.html#gravity">-gravity</a> setting. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	373
				374
				375	<div style="margin: auto;">
				376	<h3 class="magick-header"><a id="attenuate"></a>-attenuate <var>value</var></h3>
				377	</div>
				378
				379	<p class="magick-description">Lessen (or intensify) when adding noise to an image.</p>
				380
				381	<p>If unset the value is equivalent to 1.0, or a maximum noise addition</p>
				382
				383	<div style="margin: auto;">
				384	<h3 class="magick-header"><a id="authenticate"></a>-authenticate <var>password</var></h3>
				385	</div>
				386
				387	<p class="magick-description">Decrypt a PDF with a password.</p>
				388
				389	<p>Use this option to supply a <var>password</var> for decrypting
				390	a PDF that has been encrypted using Microsoft Crypto API (MSC API). The
				391	encrypting using the MSC API is not supported.</p>
				392
				393	<p>For a different encryption method, see <a href="command-line-options.html#encipher">-encipher</a>
				394	and <a href="command-line-options.html#decipher">-decipher</a>. </p>
				395
				396
				397	<div style="margin: auto;">
				398	<h3 class="magick-header"><a id="auto-gamma"></a>-auto-gamma</h3>
				399	</div>
				400
				401	<p class="magick-description">Automagically adjust gamma level of image.</p>
				402
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	403	<p>This calculates the mean values of an image, then applies a calculated <a
				404	href="command-line-options.html#gamma" >-gamma</a> adjustment so that is the mean color exists in the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	405	image it will get a have a value of 50%. </p>
				406
				407	<p>This means that any solid 'gray' image becomes 50% gray. </p>
				408
				409	<p>This works well for real-life images with little or no extreme dark and
				410	light areas, but tend to fail for images with large amounts of bright sky or
				411	dark shadows. It also does not work well for diagrams or cartoon like images.
				412	</p>
				413
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	414	<p>It uses the <a href="command-line-options.html#channel" >-channel</a> setting, (including the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	415	'<var>sync</var>' flag for channel synchronization), to determine which color
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	416	values is used and modified. As the default <a href="command-line-options.html#channel"
				417	>-channel</a> setting is '<var>RGB,sync</var>', channels are modified
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	418	together by the same gamma value, preserving colors. </p>
				419
				420
				421
				422	<div style="margin: auto;">
				423	<h3 class="magick-header"><a id="auto-level"></a>-auto-level</h3>
				424	</div>
				425
				426	<p class="magick-description">Automagically adjust color levels of image.</p>
				427
				428	<p>This is a 'perfect' image normalization operator. It finds the exact
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	429	minimum and maximum color values in the image and then applies a <a
				430	href="command-line-options.html#level" >-level</a> operator to stretch the values to the full range of
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	431	values. </p>
				432
				433	<p>The operator is not typically used for real-life images, image scans, or
				434	JPEG format images, as a single 'out-rider' pixel can set a bad min/max values
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	435	for the <a href="command-line-options.html#level" >-level</a> operation. On the other hand it is the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	436	right operator to use for color stretching gradient images being used to
				437	generate Color lookup tables, distortion maps, or other 'mathematically'
				438	defined images. </p>
				439
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	440	<p>The operator is very similar to the <a href="command-line-options.html#normalize">-normalize</a>, <a
				441	href="command-line-options.html#contrast-stretch" >-contrast-stretch</a>, and <a href="command-line-options.html#linear-stretch"
				442	>-linear-stretch</a> operators, but without 'histogram binning' or 'clipping'
				443	problems that these operators may have. That is <a href="command-line-options.html#auto-level"
				444	>-auto-level</a> is the perfect or ideal version these operators. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	445
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	446	<p>It uses the <a href="command-line-options.html#channel" >-channel</a> setting, (including the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	447	special '<var>sync</var>' flag for channel synchronization), to determine
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	448	which color values are used and modified. As the default <a
				449	href="command-line-options.html#channel" >+channel</a> setting is '<var>RGB,sync</var>', the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	450	'<var>sync</var>' ensures that the color channels will are modified
				451	together by the same gamma value, preserving colors, and ignoring
				452	transparency. </p>
				453
				454
				455	<div style="margin: auto;">
				456	<h3 class="magick-header"><a id="auto-orient"></a>-auto-orient</h3>
				457	</div>
				458
				459	<p class="magick-description">adjusts an image so that its orientation is suitable for viewing (i.e. top-left orientation).</p>
				460
				461	<p>This operator reads and resets the EXIF image profile setting 'Orientation'
				462	and then performs the appropriate 90 degree rotation on the image to orient
				463	the image, for correct viewing. </p>
				464
				465	<p>This EXIF profile setting is usually set using a gravity sensor in digital
				466	camera, however photos taken directly downward or upward may not have an
				467	appropriate value. Also images that have been orientation 'corrected' without
				468	reseting this setting, may be 'corrected' again resulting in a incorrect
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	469	result. If the EXIF profile was previously stripped, the <a
				470	href="command-line-options.html#auto-orient" >-auto-orient</a> operator will do nothing. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	471
				472
				473	<div style="margin: auto;">
				474	<h3 class="magick-header"><a id="average"></a>-average</h3>
				475	</div>
				476
				477	<p class="magick-description">Average a set of images.</p>
				478
				479	<p>An error results if the images are not identically sized.</p>
				480
				481
				482	<div style="margin: auto;">
				483	<h3 class="magick-header"><a id="backdrop"></a>-backdrop</h3>
				484	</div>
				485
				486	<p class="magick-description">Display the image centered on a backdrop.</p>
				487
				488	<p>This backdrop covers the entire workstation screen and is useful for hiding
				489	other X window activity while viewing the image. The color of the backdrop is
				490	specified as the background color. The color is specified using the format
				491	described under the <a href="command-line-options.html#fill">-fill</a> option.</p>
				492
				493	<div style="margin: auto;">
				494	<h3 class="magick-header"><a id="background"></a>-background <var>color</var></h3>
				495	</div>
				496
				497	<p class="magick-description">Set the background color.</p>
				498
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	499	<p>The color is specified using the format described under the <a
				500	href="command-line-options.html#fill">-fill</a> option. The default background color (if none is
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	501	specified or found in the image) is white.</p>
				502
				503	<div style="margin: auto;">
				504	<h3 class="magick-header"><a id="bench"></a>-bench <var>iterations</var></h3>
				505	</div>
				506
				507	<p class="magick-description">Measure performance.</p>
				508
				509	<p>Repeat the entire command for the given number of <var>iterations</var> and report the user-time and elapsed time. For instance,
				510	consider the following command and its output. Modify the benchmark with the
				511	-duration to run the benchmark for a fixed number of seconds and -concurrent
				512	to run the benchmark in parallel (requires the OpenMP feature).</p>
				513
				514	<pre>
Cristy	e09ed31	2016-03-06 08:07:39 -0500	[diff] [blame]	515	-> convert logo: -resize 200% -bench 5 logo.png
				516	Performance[1]: 5i 1.344ips 1.000e 3.710u 0:03.720
				517	Performance[2]: 5i 1.634ips 0.549e 3.890u 0:03.060
				518	Performance[3]: 5i 2.174ips 0.618e 3.190u 0:02.300
				519	Performance[4]: 5i 1.678ips 0.555e 3.810u 0:02.980
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	520	Performance[4]: 5i 0.875657ips 6.880u 0:05.710
				521	</pre>
				522
Cristy	e09ed31	2016-03-06 08:07:39 -0500	[diff] [blame]	523	<p>In this example, 5 iterations were completed at 2.174 iterations per
				524	second, using 3 threads and 3.190 seconds of the user allotted time, for
				525	a total elapsed time of 2.300 seconds.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	526
				527	<div style="margin: auto;">
				528	<h3 class="magick-header"><a id="bias"></a>-bias <var>value</var>{<var>%</var>}</h3>
				529	</div>
				530
				531	<p class="magick-description">Add bias when convolving an image.</p>
				532
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	533	<p>This option shifts the output of <a href="command-line-options.html#convolve">‑convolve</a> so that
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	534	positive and negative results are relative to the specified bias value. </p>
				535
				536	<p>This is important for non-HDRI compilations of ImageMagick when dealing
				537	with convolutions that contain negative as well as positive values. This is
				538	especially the case with convolutions involving high pass filters or edge
				539	detection. Without an output bias, the negative values are clipped at
				540	zero.</p>
				541
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	542	<p>When using an ImageMagick with the HDRI compile-time setting, <a href="command-line-options.html#bias">‑bias</a> is not needed, as ImageMagick is able to store/handle any
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	543	negative results without clipping to the color value range
				544	(0..QuantumRange).</p>
				545
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	546	<p>See the discussion on HDRI implementations of ImageMagick on the page <a
				547	href="high-dynamic-range.html" >High Dynamic-Range Images</a>. For more
				548	about HDRI go the ImageMagick <a
Cristy	364a72f	2016-11-04 22:38:41 -0400	[diff] [blame]	549	href="https://www.imagemagick.org/Usage/basics/#hdri" >Usage</a> pages or this
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	550	<a
				551	href="http://en.wikipedia.org/wiki/High_dynamic_range_imaging">Wikipedia</a>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	552	entry. </p>
				553
				554	<div style="margin: auto;">
				555	<h3 class="magick-header"><a id="black-point-compensation"></a>-black-point-compensation</h3>
				556	</div>
				557
				558	<p class="magick-description">Use black point compensation.</p>
				559
				560	<div style="margin: auto;">
				561	<h3 class="magick-header"><a id="black-threshold"></a>-black-threshold <var>value</var>{<var>%</var>}</h3>
				562	</div>
				563
				564	<p class="magick-description">Force to black all pixels below the threshold while leaving all pixels at or above the threshold unchanged.</p>
				565
				566	<p> The threshold value can be given as a percentage or as an absolute integer
				567	value within [0, <var>QuantumRange</var>] corresponding to the
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	568	desired <a href="command-line-options.html#channel">‑channel</a> value. See <a href="command-line-options.html#threshold">‑threshold</a>for more details on thresholds and resulting values. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	569
				570
				571	<div style="margin: auto;">
				572	<h3 class="magick-header"><a id="blend"></a>-blend <var>geometry</var></h3>
				573	</div>
				574
				575	<p class="magick-description">blend an image into another by the given absolute value or percent.</p>
				576
				577	<p>Blend will average the images together ('plus') according to the
				578	percentages given and each pixels transparency. If only a single percentage
				579	value is given it sets the weight of the composite or 'source' image, while
				580	the background image is weighted by the exact opposite amount. That is a
				581	<code>-blend 30%</code> merges 30% of the 'source' image with 70% of the
				582	'destination' image. Thus it is equivalent to <code>-blend 30x70%</code>.</p>
				583
				584
				585	<div style="margin: auto;">
				586	<h3 class="magick-header"><a id="blue-primary"></a>-blue-primary <var>x</var>,<var>y</var></h3>
				587	</div>
				588
				589	<p class="magick-description">Set the blue chromaticity primary point.</p>
				590
				591	<div style="margin: auto;">
				592	<h3 class="magick-header"><a id="blue-shift"></a>-blue-shift <var>factor</var></h3>
				593	</div>
				594
				595	<p class="magick-description">simulate a scene at nighttime in the moonlight. Start with a factor of 1.5</p>
				596
				597	<div style="margin: auto;">
				598
				599	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	600	<h3 class="magick-header"><a id="blur"></a>-blur <var>radius</var><br />-blur <var>radius</var>x<var>sigma</var></h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	601	</div>
				602
				603	<p class="magick-description">Reduce image noise and reduce detail levels.</p>
				604
				605	<p>Convolve the image with a Gaussian or normal distribution using the given
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	606	<var >Sigma</var> value. The formula is:</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	607
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	608	<p class="text-center"><img class="img-thumbnail" alt="gaussian distribution" width="243px" height="42px" src="../images/gaussian-blur.png"/></p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	609
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	610	<p>The <var >Sigma</var> value is the important argument, and
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	611	determines the actual amount of blurring that will take place. </p>
				612
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	613	<p>The <var >Radius</var> is only used to determine the size of the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	614	array which will hold the calculated Gaussian distribution. It should be an
				615	integer. If not given, or set to zero, IM will calculate the largest possible
				616	radius that will provide meaningful results for the Gaussian distribution.
				617	</p>
				618
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	619	<p>The larger the <var >Radius</var> the slower the
				620	operation is. However too small a <var >Radius</var>, and sever
				621	aliasing effects may result. As a guideline, <var >Radius</var>
				622	should be at least twice the <var >Sigma</var> value, though three
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	623	times will produce a more accurate result. </p>
				624
				625	<p>This option differs from <a href="command-line-options.html#gaussian-blur">-gaussian-blur</a> simply
				626	by taking advantage of the separability properties of the distribution. Here
				627	we apply a single-dimensional Gaussian matrix in the horizontal direction,
				628	then repeat the process in the vertical direction.</p>
				629
				630	<p>The <a href="command-line-options.html#virtual-pixel">-virtual-pixel</a> setting will determine how
				631	pixels which are outside the image proper are blurred into the final result.
				632	</p>
				633
				634
				635	<div style="margin: auto;">
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	636	<h3 class="magick-header"><a id="border"></a>-border <var>geometry</var></h3>
				637	</div>
				638
				639	<p class="magick-description">Surround the image with a border of color. </p>
				640
				641	<p>Set the width and height using the <var>size</var> portion of the
				642	<var>geometry</var> argument. See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument. Offsets are
				643	ignored. </p>
				644
				645	<p>As of IM 6.7.8-8, the <var>geometry</var> arguments behave as follows:</p>
				646
				647	<dl class="dl-horizontal">
				648	<dt><var>value</var></dt>
				649	<dd>value is added to both left/right and top/bottom</dd>
				650	<dt><var>value-x</var><kbd>x</kbd></dt>
				651	<dd>value-x is added only to left/right and top/bottom are unchanged</dd>
				652	<dt><kbd>x</kbd><var>value-y</var></dt>
				653	<dd>value-y is added only to top/bottom and left/right are unchanged</dd>
				654	<dt><var>value-x</var><kbd>x</kbd><var>value-y</var></dt>
				655	<dd>value-x is added to left/right and value-y added to top/bottom</dd>
				656	<dt><var>value-x</var><kbd>x</kbd>0</dt>
				657	<dd>value-x is added only to left/right and top/bottom are unchanged</dd>
				658	<dt>0<kbd>x</kbd><var>value-y</var></dt>
				659	<dd>value-y is added only to top/bottom and left/right are unchanged</dd>
				660	<dt><var>value</var>%</dt>
				661	<dd>value % of width is added to left/right and value % of height is added to top/bottom</dd>
				662	<dt><var>value-x</var><kbd>x</kbd>%</dt>
				663	<dd>value-x % of width is added to left/right and to top/bottom</dd>
				664	<dt>x<var>value-y</var>%</dt>
				665	<dd>value-y % of height is added to top/bottom and to left/right</dd>
				666	<dt><var>value-x</var>%<kbd>x</kbd><var>value-y</var>%</dt>
				667	<dd>value-x % of width is added to left/right and value-y % of height is added to top/bottom</dd>
				668	<dt><var>value-x</var>%<kbd>x</kbd>0%</dt>
				669	<dd>value-x % of width is added to left/right and top/bottom are unchanged</dd>
				670	<dt>0%<kbd>x</kbd><var>value-y</var>%</dt>
				671	<dd>value-y % of height is added to top/bottom and left/right are unchanged</dd>
				672	</dl>
				673
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	674	<p>Set the border color by preceding with the <a
				675	href="command-line-options.html#bordercolor">-bordercolor</a> setting.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	676
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	677	<p>The <a href="command-line-options.html#border">-border</a> operation is affected by the current <a
				678	href="command-line-options.html#compose">-compose</a> setting and assumes that this is using the default
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	679	'<code>Over</code>' composition method. It generates an image of the appropriate
				680	size colors by the current <a href="command-line-options.html#bordercolor">-bordercolor</a> before
				681	overlaying the original image in the center of this net image. This means that
				682	with the default compose method of '<code>Over</code>' any transparent parts may
				683	be replaced by the current <a href="command-line-options.html#bordercolor">-bordercolor</a> setting.</p>
				684	<p>See also the <a href="command-line-options.html#frame">-frame</a> option, which has more
				685	functionality.</p>
				686
				687	<div style="margin: auto;">
				688	<h3 class="magick-header"><a id="bordercolor"></a>-bordercolor <var>color</var></h3>
				689	</div>
				690
				691	<p class="magick-description">Set the border color.</p>
				692
				693	<p>The color is specified using the format described under the <a href="command-line-options.html#fill">-fill</a> option.</p>
				694
				695	<p>The default border color is <code>#DFDFDF</code>, <span style="background-color: #dfdfdf;">this shade of gray</span>.</p>
				696
				697	<div style="margin: auto;">
				698	<h3 class="magick-header"><a id="borderwidth"></a>-borderwidth <var>geometry</var> </h3>
				699	</div>
				700
				701	<p class="magick-description">Set the border width.</p>
				702
				703	<div style="margin: auto;">
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	704	<h3 class="magick-header"><a id="brightness-contrast"></a>-brightness-contrast <var>brightness</var><br />-brightness-contrast <var>brightness</var>{x<var>contrast</var>}{<var>%</var>}</h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	705	</div>
				706
				707	<p class="magick-description">Adjust the brightness and/or contrast of the image.</p>
				708
				709	<p>Brightness and Contrast values apply changes to the input image. They are
				710	not absolute settings. A brightness or contrast value of zero means no change.
				711	The range of values is -100 to +100 on each. Positive values increase the
				712	brightness or contrast and negative values decrease the brightness or contrast.
				713	To control only contrast, set the brightness=0. To control only brightness,
				714	set contrast=0 or just leave it off.</p>
				715
				716	<p>You may also use <a href="command-line-options.html#fill">-channel</a> to control which channels to
				717	apply the brightness and/or contrast change. The default is to apply the same
				718	transformation to all channels.</p>
				719
				720	<p>Brightness and Contrast arguments are converted to offset and slope of a
				721	linear transform and applied
				722	using <a href="command-line-options.html#fill">-function polynomial "slope,offset"</a>.</p>
				723
				724	<p>The slope varies from 0 at contrast=-100 to almost vertical at
				725	contrast=+100. For brightness=0 and contrast=-100, the result are totally
				726	midgray. For brightness=0 and contrast=+100, the result will approach but
				727	not quite reach a threshold at midgray; that is the linear transformation
				728	is a very steep vertical line at mid gray.</p>
				729
				730	<p>Negative slopes, i.e. negating the image, are not possible with this
				731	function. All achievable slopes are zero or positive.</p>
				732
				733	<p>The offset varies from -0.5 at brightness=-100 to 0 at brightness=0 to +0.5
				734	at brightness=+100. Thus, when contrast=0 and brightness=100, the result is
				735	totally white. Similarly, when contrast=0 and brightness=-100, the result is
				736	totally black.</p>
				737
				738	<p>As the range of values for the arguments are -100 to +100, adding the '%'
				739	symbol is no different than leaving it off.</p>
				740
				741	<div style="margin: auto;">
				742	<h3 class="magick-header"><a id="cache"></a>-cache <var>threshold</var></h3>
				743	</div>
				744
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	745	<p class="magick-description">(This option has been replaced by the <a href='command-line-options.html#limit'>-limit</a> option).</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	746
				747	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	748	<h3 class="magick-header"><a id="canny"></a>-canny <var>radius</var><br/>-canny <var>radius</var>x<var>sigma</var>{<var>+lower-percent</var>}{<var>+upper-percent</var>}</h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	749	</div>
				750
				751	<p class="magick-description">Canny edge detector uses a multi-stage algorithm to detect a wide range of edges in the image.</p>
				752
				753	<p>The thresholds range from 0 to 100% (e.g. -canny 0x1+10%+30%) with {<var>+lower-percent</var>} < {<var>+upper-percent</var>}. If {<var>+upper-percent</var>} is increased but {<var>+lower-percent</var>} remains the same, lesser edge components will be detected, but their lengths will be the same. If {<var>+lower-percent</var>} is increased but {<var>+upper-percent</var>} is the same, the same number of edge components will be detected but their lengths will be shorter. The default thresholds are shown. The <var>radius</var>x<var>sigma</var> controls a gaussian blur applied to the input image to reduce noise and smooth the edges.</p>
				754
				755	<div style="margin: auto;">
				756	<h3 class="magick-header"><a id="caption"></a>-caption <var>string</var></h3>
				757	</div>
				758
				759	<p class="magick-description">Assign a caption to an image.</p>
				760
				761	<p>This option sets the caption meta-data of an image read in after this
				762	option has been given. To modify a caption of images already in memory use
				763	"<code><a href="command-line-options.html#set">-set</a> caption</code>". </p>
				764
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	765	<p>The caption can contain special format characters listed in the <a
				766	href="escape.html">Format and
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	767	Print Image Properties</a>. These attributes are expanded when the caption
				768	is finally assigned to the individual images. </p>
				769
				770	<p>If the first character of <var>string</var> is <var>@</var>, the image caption is read from a file titled by the
				771	remaining characters in the string. Comments read in from a file are literal;
				772	no embedded formatting characters are recognized.</p>
				773
				774	<p>Caption meta-data is not visible on the image itself. To do that use the
				775	<a href="command-line-options.html#annotate">-annotate</a> or <a href="command-line-options.html#draw">-draw</a> options
				776	instead.</p>
				777
				778	<p>For example,</p>
				779
				780	<pre>
				781	-caption "%m:%f %wx%h" bird.miff
				782	</pre>
				783
				784	<p>produces an image caption of <code>MIFF:bird.miff 512x480</code> (assuming
				785	that the image <code>bird.miff</code> has a width of 512 and a height of
				786	480.</p>
				787
				788
				789	<div style="margin: auto;">
				790	<h3 class="magick-header"><a id="cdl"></a>-cdl <var>filename</var></h3>
				791	</div>
				792
				793	<p class="magick-description">color correct with a color decision list.</p>
				794
				795	<p>Here is an example color correction collection:</p>
				796
				797	<pre>
				798	<?xml version="1.0" encoding="UTF-8"?>
				799	<ColorCorrectionCollection xmlns="urn:ASC:CDL:v1.2">
				800	<ColorCorrection id="cc06668">
				801	<SOPNode>
				802	<Slope> 0.9 1.2 0.5 </Slope>
				803	<Offset> 0.4 -0.5 0.6 </Offset>
				804	<Power> 1.0 0.8 1.5 </Power>
				805	</SOPNode>
				806	<SATNode>
				807	<Saturation> 0.85 </Saturation>
				808	</SATNode>
				809	</ColorCorrection>
				810	</ColorCorrectionCollection>
				811	</pre>
				812
				813	<div style="margin: auto;">
				814	<h3 class="magick-header"><a id="channel"></a>-channel <var>type</var></h3>
				815	</div>
				816
				817	<p class="magick-description">Specify those image color channels to which subsequent operators are limited.</p>
				818
				819	<p>Choose from: <code>Red</code>, <code>Green</code>, <code>Blue</code>,
				820	<code>Alpha</code>, <code>Gray</code>, <code>Cyan</code>, <code>Magenta</code>,
				821	<code>Yellow</code>, <code>Black</code>, <code>Opacity</code>,
				822	<code>Index</code>, <code>RGB</code>, <code>RGBA</code>, <code>CMYK</code>, or
				823	<code>CMYKA</code>.</p>
				824
				825	<p>The channels above can also be specified as a comma-separated list or can be
				826	abbreviated as a concatenation of the letters '<code>R</code>', '<code>G</code>',
				827	'<code>B</code>', '<code>A</code>', '<code>O</code>', '<code>C</code>',
				828	'<code>M</code>', '<code>Y</code>', '<code>K</code>'.
				829
				830	For example, to only select the <code>Red</code> and <code>Blue</code> channels
				831	you can either use </p>
				832	<pre>
				833	-channel Red,Blue
				834	</pre>
				835	<p>or you can use the short hand form</p>
				836	<pre>
				837	-channel RB
				838	</pre>
				839
				840	<p>All the channels that are present in an image can be specified using the
				841	special channel type <code>All</code>. Not all operators are 'channel capable',
				842	but generally any operators that are generally 'grey-scale' image operators,
				843	will understand this setting. See individual operator documentation. </p>
				844
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	845	<br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	846
				847	<p>On top of the normal channel selection an extra flag can be specified,
				848	'<code>Sync</code>'. This is turned on by default and if set means that
				849	operators that understand this flag should perform: cross-channel
				850	synchronization of the channels. If not specified, then most grey-scale
				851	operators will apply their image processing operations to each individual
				852	channel (as specified by the rest of the <a href="command-line-options.html#channel">-channel</a>
				853	setting) completely independently from each other. </p>
				854
				855	<p>For example for operators such as <a href="command-line-options.html#auto-level">-auto-level</a> and
				856	<a href="command-line-options.html#auto-gamma">-auto-gamma</a> the color channels are modified
				857	together in exactly the same way so that colors will remain in-sync. Without
				858	it being set, then each channel is modified separately and
				859	independently, which may produce color distortion. </p>
				860
				861	<p>The <a href="command-line-options.html#morphology">-morphology</a> '<code>Convolve</code>' method
				862	and the <a href="command-line-options.html#compose">-compose</a> mathematical methods, also understands
				863	the '<code>Sync</code>' flag to modify the behavior of pixel colors according
				864	to the alpha channel (if present). That is to say it will modify the image
				865	processing with the understanding that fully-transparent colors should not
				866	contribute to the final result. </p>
				867
				868	<p>Basically, by default, operators work with color channels in synchronous, and
				869	treats transparency as special, unless the <a href="command-line-options.html#channel">-channel</a>
				870	setting is modified so as to remove the effect of the '<code>Sync</code>' flag.
				871	How each operator does this depends on that operators current implementation.
				872	Not all operators understands this flag at this time, but that is changing.
				873	</p>
				874
				875	<p>To print a complete list of channel types, use <a href="command-line-options.html#list">-list
				876	channel</a>.</p>
				877
				878	<p>By default, ImageMagick sets <a href="command-line-options.html#channel">-channel</a> to the value
				879	'<code>RGBK,sync</code>', which specifies that operators act on all color
				880	channels except the transparency channel, and that all the color channels are
				881	to be modified in exactly the same way, with an understanding of transparency
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	882	(depending on the operation being applied). The 'plus' form <a
				883	href="command-line-options.html#channel" >+channel</a> will reset the value back to this default. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	884
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	885	<p>Options that are affected by the <a href="command-line-options.html#channel" >-channel</a> setting
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	886	include the following.
				887
				888	<a href="command-line-options.html#auto-gamma">-auto-gamma</a>,
				889	<a href="command-line-options.html#auto-level">-auto-level</a>,
				890	<a href="command-line-options.html#black-threshold">-black-threshold</a>,
				891	<a href="command-line-options.html#blur">-blur</a>,
				892	<a href="command-line-options.html#clamp">-clamp</a>,
				893	<a href="command-line-options.html#clut">-clut</a>,
				894	<a href="command-line-options.html#combine">-combine</a>,
				895	<a href="command-line-options.html#composite">-composite</a> (Mathematical compose methods only),
				896	<a href="command-line-options.html#convolve">-convolve</a>,
				897	<a href="command-line-options.html#contrast-stretch">-contrast-stretch</a>,
				898	<a href="command-line-options.html#evaluate">-evaluate</a>,
				899	<a href="command-line-options.html#function">-function</a>,
				900	<a href="command-line-options.html#fx">-fx</a>,
				901	<a href="command-line-options.html#gaussian-blur">-gaussian-blur</a>,
				902	<a href="command-line-options.html#hald-clut">-hald-clut</a>,
				903	<a href="command-line-options.html#motion-blur">-motion-blur</a>,
				904	<a href="command-line-options.html#morphology">-morphology</a>,
				905	<a href="command-line-options.html#negate">-negate</a>,
				906	<a href="command-line-options.html#normalize">-normalize</a>,
				907	<a href="command-line-options.html#ordered-dither">-ordered-dither</a>,
				908	<a href="command-line-options.html#radial-blur">-radial-blur</a>,
				909	<a href="command-line-options.html#random-threshold">-random-threshold</a>,
				910	<a href="command-line-options.html#separate">-separate</a>,
				911	<a href="command-line-options.html#threshold">-threshold</a>, and
				912	<a href="command-line-options.html#white-threshold">-white-threshold</a>.
				913	</p>
				914
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	915	<p>Warning, some operators behave differently when the <a href="command-line-options.html#channel"
				916	>+channel</a> default setting is in effect, verses ANY user defined <a
				917	href="command-line-options.html#channel" >-channel</a> setting (including the equivalent of the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	918	default). These operators have yet to be made to understand the newer 'Sync'
				919	flag. </p>
				920
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	921	<p>For example <a href="command-line-options.html#threshold">-threshold</a> will by default grayscale
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	922	the image before thresholding, if no <a href="command-line-options.html#channel" >-channel</a> setting
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	923	has been defined. This is not 'Sync flag controlled, yet. </p>
				924
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	925	<p>Also some operators such as <a href="command-line-options.html#blur">-blur</a>, <a
				926	href="command-line-options.html#gaussian-blur">-gaussian-blur</a>, will modify their handling of the
				927	color channels if the '<code>alpha</code>' channel is also enabled by <a
				928	href="command-line-options.html#channel" >-channel</a>. Generally this done to ensure that
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	929	fully-transparent colors are treated as being fully-transparent, and thus any
				930	underlying 'hidden' color has no effect on the final results. Typically
				931	resulting in 'halo' effects. The newer <a href="command-line-options.html#morphology">-morphology</a>
				932	convolution equivalents however does have a understanding of the 'Sync' flag
				933	and will thus handle transparency correctly by default. </p>
				934
				935	<p>As a alpha channel is optional within images, some operators will read the
				936	color channels of an image as a greyscale alpha mask, when the image has no
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	937	alpha channel present, and the <a href="command-line-options.html#channel" >-channel</a> setting tells
				938	the operator to apply the operation using alpha channels. The <a
				939	href="command-line-options.html#clut">-clut</a> operator is a good example of this. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	940
				941
				942
				943	<div style="margin: auto;">
				944	<h3 class="magick-header"><a id="charcoal"></a>-charcoal <var>factor</var></h3>
				945	</div>
				946
				947	<p class="magick-description">Simulate a charcoal drawing.</p>
				948
				949	<div style="margin: auto;">
				950	<h3 class="magick-header"><a id="chop"></a>-chop <var>geometry</var></h3>
				951	</div>
				952
				953	<p class="magick-description">Remove pixels from the interior of an image.</p>
				954
				955	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument. The <var>width</var>
				956	and <var>height</var> given in the of the <var>size</var>
				957	portion of the <var>geometry</var> argument give the number of
				958	columns and rows to remove. The <var>offset</var> portion of
				959	the <var>geometry</var> argument is influenced by
				960	a <a href="command-line-options.html#gravity">-gravity</a> setting, if present.</p>
				961
				962	<p>The <a href="command-line-options.html#chop">-chop</a> option removes entire rows and columns,
				963	and moves the remaining corner blocks leftward and upward to close the gaps.</p>
				964
				965	<p>While it can remove internal rows and columns of pixels, it is more
				966	typically used with as <a href="command-line-options.html#gravity">-gravity</a> setting and zero
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	967	offsets so as to remove a single edge from an image. Compare this to <a
				968	href="command-line-options.html#shave" >-shave</a> which removes equal numbers of pixels from opposite
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	969	sides of the image. </p>
				970
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	971	<p>Using <a href="command-line-options.html#chop">-chop</a> effectively undoes the results of a <a
				972	href="command-line-options.html#splice">-splice</a> that was given the same <var>geometry</var> and <a href="command-line-options.html#gravity">-gravity</a> settings. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	973
				974	<div style="margin: auto;">
				975	<h3 class="magick-header"><a id="clamp"></a>-clamp</h3>
				976	</div>
				977
				978	<p class="magick-description">set each pixel whose value is below zero to zero and any the pixel whose value is above the quantum range to the quantum range (e.g. 65535) otherwise the pixel value remains unchanged.</p>
				979
				980	<div style="margin: auto;">
				981	<h3 class="magick-header"><a id="clip"></a>-clip</h3>
				982	</div>
				983
				984	<p class="magick-description">Apply the clipping path if one is present.</p>
				985
				986	<p>If a clipping path is present, it is applied to subsequent operations.</p>
				987
				988	<p>For example, in the command</p>
				989
				990	<pre>
				991	convert cockatoo.tif -clip -negate negated.tif
				992	</pre>
				993
				994	<p>only the pixels within the clipping path are negated.</p>
				995
				996	<p>The <a href="command-line-options.html#clip">-clip</a> feature requires SVG support. If the SVG
				997	delegate library is not present, the option is ignored.</p>
				998
				999	<p>Use <a href="command-line-options.html#clip">+clip</a> to disable clipping for subsequent operations.</p>
				1000
				1001	<div style="margin: auto;">
				1002	<h3 class="magick-header"><a id="clip-mask"></a>-clip-mask</h3>
				1003	</div>
				1004
				1005	<p class="magick-description">Clip the image as defined by this mask.</p>
				1006
				1007	<p>Use the alpha channel of the current image as a mask. Any areas that is
				1008	white is not modified by any of the 'image processing operators' that follow,
				1009	until the mask is removed. Pixels in the black areas of the clip mask are
				1010	modified per the requirements of the operator. </p>
				1011
				1012	<p>In some ways this is similar to (though not the same) as defining
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1013	a rectangular <a href="command-line-options.html#region" >-region</a>, or using the negative of the
				1014	mask (third) image in a three image <a href="command-line-options.html#composite" >-composite</a>,
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1015	operation. </p>
				1016
				1017	<p>Use <a href="command-line-options.html#clip-mask">+clip-mask</a> to disable clipping for subsequent operations.</p>
				1018
				1019	<div style="margin: auto;">
				1020	<h3 class="magick-header"><a id="clip-path"></a>-clip-path <var>id</var></h3>
				1021	</div>
				1022
				1023	<p class="magick-description">Clip along a named path from the 8BIM profile.</p>
				1024
				1025	<p>This is identical to <a href="command-line-options.html#clip">-clip</a> except choose a specific clip path in the event the image has more than one path available. </p>
				1026
				1027	<p>Use <a href="command-line-options.html#clip-path">+clip-path</a> to disable clipping for subsequent operations.</p>
				1028
				1029	<div style="margin: auto;">
				1030	<h3 class="magick-header"><a id="clone"></a>-clone <var>index(s)</var></h3>
				1031	</div>
				1032
				1033	<p class="magick-description">make a clone of an image (or images).</p>
				1034
				1035	<p>Inside parenthesis (where the operator is normally used) it will make a
				1036	clone of the images from the last 'pushed' image sequence, and adds them to
				1037	the end of the current image sequence. Outside parenthesis
				1038	(not recommended) it clones the images from the current image sequence. </p>
				1039
				1040	<p>Specify the image by its index in the sequence. The first image is index
				1041	0. Negative indexes are relative to the end of the sequence; for
				1042	example, <code>−1</code>
				1043	represents the last image of the sequence. Specify a range of images with a
				1044	dash (e.g. <code>0−4</code>). Separate multiple indexes with commas but no
				1045	spaces (e.g. <code>0,2,5</code>). A value of '<code>0−−1</code> will
				1046	effectively clone all the images. </p>
				1047
				1048	<p>The <a href="command-line-options.html#clone">+clone</a> will simply make a copy of the last image
				1049	in the image sequence, and is thus equivalent to using a argument of
				1050	'<code>−1</code>'. </p>
				1051
				1052	<div style="margin: auto;">
				1053	<h3 class="magick-header"><a id="clut"></a>-clut</h3>
				1054	</div>
				1055
				1056	<p class="magick-description">Replace the channel values in the first image using each corresponding channel in the second image as a <b>c</b>olor <b>l</b>ook<b>u</b>p <b>t</b>able.</p>
				1057
				1058	<p>The second (LUT) image is ordinarily a gradient image containing the
				1059	histogram mapping of how each channel should be modified. Typically it is a
				1060	either a single row or column image of replacement color values. If larger
				1061	than a single row or column, values are taken from a diagonal line from
				1062	top-left to bottom-right corners.</p>
				1063
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1064	<p>The lookup is further controlled by the <a
				1065	href="command-line-options.html#interpolate">-interpolate</a> setting, which is especially handy for an
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1066	LUT which is not the full length needed by the ImageMagick installed Quality
				1067	(Q) level. Good settings for this are the '<code>bilinear</code>' and
				1068	'<code>bicubic</code>' interpolation settings, which give smooth color
				1069	gradients, and the '<code>integer</code>' setting for a direct, unsmoothed
				1070	lookup of color values. </p>
				1071
				1072	<p>This operator is especially suited to replacing a grayscale image with a
				1073	specific color gradient from the CLUT image. </p>
				1074
				1075	<p>Only the channel values defined by the <a href="command-line-options.html#channel">-channel</a>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1076	setting will have their values replaced. In particular, since the default <a
				1077	href="command-line-options.html#channel">-channel</a> setting is <code>RGB</code>, this means that
				1078	transparency (alpha/matte channel) is not affected, unless the <a
				1079	href="command-line-options.html#channel">-channel</a> setting is modified. When the alpha channel is
				1080	set, it is treated by the <a href="command-line-options.html#clut" >-clut</a> operator in the same way
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1081	as the other channels, implying that alpha/matte values are replaced using the
				1082	alpha/matte values of the original image. </p>
				1083
				1084	<p>If either the image being modified, or the lookup image, contains no
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1085	transparency (i.e. <a href="command-line-options.html#alpha" >-alpha</a> is turned 'off') but the <a
				1086	href="command-line-options.html#channel">-channel</a> setting includes alpha replacement, then it is
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	1087	assumed that image represents a grayscale gradient which is used for the
				1088	replacement alpha values. That is you can use a grayscale CLUT image to
				1089	adjust a existing images alpha channel, or you can color a grayscale image
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1090	using colors form CLUT containing the desired colors, including transparency.
				1091	</p>
				1092
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1093	<p>See also <a href="command-line-options.html#hald-clut" >-hald-clut</a> which replaces colors
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1094	according to the lookup of the full color RGB value from a 2D representation
				1095	of a 3D color cube. </p>
				1096
				1097
				1098	<div style="margin: auto;">
				1099	<h3 class="magick-header"><a id="coalesce"></a>-coalesce</h3>
				1100	</div>
				1101
				1102	<p class="magick-description">Fully define the look of each frame of an GIF animation sequence, to form a 'film strip' animation.</p>
				1103
				1104	<p>Overlay each image in an image sequence according to
				1105	its <a href="command-line-options.html#dispose">-dispose</a> meta-data, to reproduce the look of
				1106	an animation at each point in the animation sequence. All images should be
				1107	the same size, and are assigned appropriate GIF disposal settings for the
				1108	animation to continue working as expected as a GIF animation. Such frames
				1109	are more easily viewed and processed than the highly optimized GIF overlay
				1110	images. </p>
				1111
				1112	<p>The animation can be re-optimized after processing using
				1113	the <a href="command-line-options.html#layers">-layers</a> method '<code>optimize</code>', although
				1114	there is no guarantee that the restored GIF animation optimization is
				1115	better than the original. </p>
				1116
				1117
				1118	<div style="margin: auto;">
				1119	<h3 class="magick-header"><a id="colorize"></a>-colorize <var>value</var></h3>
				1120	</div>
				1121
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1122	<p class="magick-description">Colorize the image by an amount specified by <var>value</var> using the color specified by the most recent <a href="command-line-options.html#fill" >-fill</a> setting.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1123
				1124	<p>Specify the amount of colorization as a percentage. Separate colorization
				1125	values can be applied to the red, green, and blue channels of the image with
				1126	a comma-delimited list of colorization
				1127	values (e.g., <code>-colorize 0,0,50</code>).</p>
				1128
				1129	<div style="margin: auto;">
				1130	<h3 class="magick-header"><a id="colormap"></a>-colormap <var>type</var></h3>
				1131	</div>
				1132
				1133	<p class="magick-description">Define the colormap type.</p>
				1134
				1135	<p>The <var>type</var> can be <code>shared</code> or <code>private</code>.</p>
				1136
				1137	<p>This option only applies when the default X server visual
				1138	is <code>PseudoColor</code> or <code>GrayScale</code>. Refer
				1139	to <a href="command-line-options.html#visual">-visual</a> for more details. By default,
				1140	a shared colormap is allocated. The image shares colors with
				1141	other X clients. Some image colors could be approximated,
				1142	therefore your image may look very different than intended.
				1143	If <code>private</code> is chosen, the image colors appear exactly
				1144	as they are defined. However, other clients may go <var>technicolor</var>
				1145	when the image colormap is installed.</p>
				1146
				1147	<div style="margin: auto;">
				1148	<h3 class="magick-header"><a id="colors"></a>-colors <var>value</var></h3>
				1149	</div>
				1150
				1151	<p class="magick-description">Set the preferred number of colors in the image.</p>
				1152
				1153	<p>The actual number of colors in the image may be less than your request,
				1154	but never more. Note that this a color reduction option. Images with fewer
				1155	unique colors than specified by <var>value</var> will have any
				1156	duplicate or unused colors removed. The ordering of an existing color
				1157	palette may be altered. When converting an image from color to grayscale,
				1158	it is more efficient to convert the image to the gray colorspace before
				1159	reducing the number of colors. Refer to
				1160	the <a href="quantize.html">
				1161	color reduction algorithm</a> for more details.</p>
				1162
				1163	<div style="margin: auto;">
				1164	<h3 class="magick-header"><a id="color-matrix"></a>-color-matrix <var>matrix</var></h3>
				1165	</div>
				1166
				1167	<p class="magick-description">apply color correction to the image.</p>
				1168
				1169	<p>This option permits saturation changes, hue rotation, luminance to alpha,
				1170	and various other effects. Although variable-sized transformation matrices
				1171	can be used, typically one uses a 5x5 matrix for an RGBA image and a 6x6
				1172	for CMYKA (or RGBA with offsets). The matrix is similar to those used by
				1173	Adobe Flash except offsets are in column 6 rather than 5 (in support of
				1174	CMYKA images) and offsets are normalized (divide Flash offset by 255).</p>
				1175
				1176	<p>As an example, to add contrast to an image with offsets, try this command:</p>
				1177
				1178	<pre>
				1179	convert kittens.jpg -color-matrix \
				1180	" 1.5 0.0 0.0 0.0, 0.0, -0.157 \
				1181	0.0 1.5 0.0 0.0, 0.0, -0.157 \
				1182	0.0 0.0 1.5 0.0, 0.0, -0.157 \
				1183	0.0 0.0 0.0 1.0, 0.0, 0.0 \
				1184	0.0 0.0 0.0 0.0, 1.0, 0.0 \
				1185	0.0 0.0 0.0 0.0, 0.0, 1.0" kittens.png
				1186	</pre>
				1187	<div style="margin: auto;">
				1188	<h3 class="magick-header"><a id="colorspace"></a>-colorspace <var>value</var></h3>
				1189	</div>
				1190
				1191	<p class="magick-description">Set the image colorspace.</p>
				1192
				1193	<p>Choices are:</p>
				1194
				1195	<pre>
				1196	CMY CMYK Gray HCL
				1197	HCLp HSB HSI HSL
				1198	HSV HWB Lab LCHab
				1199	LCHuv LMS Log Luv
				1200	OHTA Rec601YCbCr Rec709YCbCr RGB
				1201	scRGB sRGB Transparent xyY
				1202	XYZ YCbCr YCC YDbDr
				1203	YIQ YPbPr YUV
				1204	</pre>
				1205
				1206	<p>To print a complete list of colorspaces, use <a href="command-line-options.html#list">-list colorspace</a>.</p>
				1207
				1208	<p>For a more accurate color conversion to or from the linear RGB, CMYK, or grayscale colorspaces, use the <a href="command-line-options.html#profile">-profile</a> option. Note, ImageMagick assumes the sRGB colorspace if the image format does not indicate otherwise. For colorspace conversion, the gamma function is first removed to produce linear RGB.</p>
				1209
				1210	<table class="table table-condensed table-striped">
				1211	<caption>Conversion of RGB to Other Color Spaces</caption>
				1212	<tr><th valign="middle">CMY</th></tr>
				1213	<tr><td valign="middle">C=<var>QuantumRange</var>−R</td></tr>
				1214	<tr><td valign="middle">M=<var>QuantumRange</var>−G</td></tr>
				1215	<tr><td valign="middle">Y=<var>QuantumRange</var>−B</td></tr>
				1216	<tr><th valign="middle">CMYK — starts with CMY from above</th></tr>
				1217	<tr><td valign="middle">K=min(C,Y,M)</td></tr>
				1218	<tr><td valign="middle">C=<var>QuantumRange</var>*(C−K)/(<var>QuantumRange</var>−K)</td></tr>
				1219	<tr><td valign="middle">M=<var>QuantumRange</var>*(M−K)/(<var>QuantumRange</var>−K)</td></tr>
				1220	<tr><td valign="middle">Y=<var>QuantumRange</var>*(Y−K)/(<var>QuantumRange</var>−K)</td></tr>
				1221
				1222	<tr><th valign="middle">Gray</th></tr>
				1223	<tr><td valign="middle">Gray = 0.298839R+0.586811G+0.114350*B</td></tr>
				1224
				1225	<tr><th valign="middle">HSB — Hue, Saturation, Brightness; like a cone peak downward</th></tr>
				1226	<tr><td valign="middle">H=angle around perimeter (0 to 360 deg); H=0 is red; increasing angles toward green</td></tr>
				1227	<tr><td valign="middle">S=distance from axis outward</td></tr>
				1228	<tr><td valign="middle">B=distance along axis from bottom upward; B=max(R,G,B); <var>intensity-like</var></td></tr>
				1229
				1230	<tr><th valign="middle">HSL — Hue, Saturation, Lightness; like a double cone end-to-end with peaks at very top and bottom</th></tr>
				1231	<tr><td valign="middle">H=angle around perimeter (0 to 360 deg); H=0 is red; increasing angles toward green</td></tr>
				1232	<tr><td valign="middle">S=distance from axis outward</td></tr>
				1233	<tr><td valign="middle">L=distance along axis from bottom upward; L=0.5max(R,G,B) + 0.5min(R,G,B); <var>intensity-like</var></td></tr>
				1234
				1235	<tr><th valign="middle">HWB — Hue, Whiteness, Blackness</th></tr>
				1236	<tr><td valign="middle">Hue (complicated equation)</td></tr>
				1237	<tr><td valign="middle">Whiteness (complicated equation)</td></tr>
				1238	<tr><td valign="middle">Blackness (complicated equation)</td></tr>
				1239
				1240	<tr><th valign="middle">LAB</th></tr>
				1241	<tr><td valign="middle">L (complicated equation relating X,Y,Z)</td></tr>
				1242	<tr><td valign="middle">A (complicated equation relating X,Y,Z)</td></tr>
				1243	<tr><td valign="middle">B (complicated equation relating X,Y,Z)</td></tr>
				1244
				1245	<tr><th valign="middle">LOG</th></tr>
				1246	<tr><td valign="middle">I1 (complicated equation involving logarithm of R)</td></tr>
				1247	<tr><td valign="middle">I2 (complicated equation involving logarithm of G)</td></tr>
				1248	<tr><td valign="middle">I3 (complicated equation involving logarithm of B)</td></tr>
				1249
				1250	<tr><th valign="middle">OHTA — approximates principal components transformation</th></tr>
				1251	<tr><td valign="middle">I1=0.33333R+0.33334G+0.33333*B; <var>intensity-like</var></td></tr>
				1252	<tr><td valign="middle">I2=(0.50000R+0.00000G−0.50000B)(<var>QuantumRange</var>+1)/2</td></tr>
				1253	<tr><td valign="middle">I3=(−0.25000R+0.50000G−0.25000B)(<var>QuantumRange</var>+1)/2</td></tr>
				1254
				1255	<tr><th valign="middle">Rec601Luma</th></tr>
				1256	<tr><td valign="middle">Gray = 0.298839R+0.586811G+0.114350*B</td></tr>
				1257
				1258	<tr><th valign="middle">Rec601YCbCr</th></tr>
				1259	<tr><td valign="middle">Y=0.2988390R+0.5868110G+0.1143500*B; <var>intensity-like</var></td></tr>
				1260	<tr><td valign="middle">Cb=(−0.168736R-0.331264G+0.500000B)(<var>QuantumRange</var>+1)/2</td></tr>
				1261	<tr><td valign="middle">Cr=(0.500000R−0.418688G−0.081312B)(<var>QuantumRange</var>+1)/2</td></tr>
				1262
				1263	<tr><th valign="middle">Rec709Luma</th></tr>
				1264	<tr><td valign="middle">Gray=0.212656R+0.715158G+0.072186*B</td></tr>
				1265
				1266	<tr><th valign="middle">Rec709YCbCr</th></tr>
				1267	<tr><td valign="middle">Y=0.212656R+0.715158G+0.072186*B; <var>intensity-like</var></td></tr>
				1268	<tr><td valign="middle">Cb=(−0.114572R−0.385428G+0.500000*B)+(<var>QuantumRange</var>+1)/2</td></tr>
				1269	<tr><td valign="middle">Cr=(0.500000R−0.454153G−0.045847*B)+(<var>QuantumRange</var>+1)/2</td></tr>
				1270
				1271	<tr><th valign="middle">sRGB</th></tr>
				1272	<tr><td valign="middle">if R ≤ .0.0031308 then Rs=R/12.92 else Rs=1.055 R ^ (1.0 / 2.4) ? 0.055</td></tr>
				1273	<tr><td valign="middle">if G ≤ .0.0031308 then Gs=B/12.92 else Gs=1.055 R ^ (1.0 / 2.4) ? 0.055</td></tr>
				1274	<tr><td valign="middle">if B ≤ .0.0031308 then Bs=B/12.92 else Bs=1.055 R ^ (1.0 / 2.4) ? 0.055</td></tr>
				1275
				1276	<tr><th valign="middle">XYZ</th></tr>
				1277	<tr><td valign="middle">X=0.4124564R+0.3575761G+0.1804375*B</td></tr>
				1278	<tr><td valign="middle">Y=0.2126729R+0.7151522G+0.0721750*B</td></tr>
				1279	<tr><td valign="middle">Z=0.0193339R+0.1191920G+0.9503041*B</td></tr>
				1280
				1281	<tr><th valign="middle">YCC</th></tr>
				1282	<tr><td valign="middle">Y=(0.298839R+0.586811G+0.114350*B) (with complicated scaling); <var>intensity-like</var></td></tr>
				1283	<tr><td valign="middle">C1=(−0.298839R−0.586811G+0.88600*B) (with complicated scaling)</td></tr>
				1284	<tr><td valign="middle">C2=(0.70100R−0.586811G−0.114350*B) (with complicated scaling)</td></tr>
				1285
				1286	<tr><th valign="middle">YCbCr</th></tr>
				1287	<tr><td valign="middle">Y=0.2988390R+0.5868110G+0.1143500*B; <var>intensity-like</var></td></tr>
				1288	<tr><td valign="middle">Cb=(−0.168736R−0.331264G+0.500000B)(<var>QuantumRange</var>+1)/2</td></tr>
				1289	<tr><td valign="middle">Cr=(0.500000R−0.418688G−0.081312B)(<var>QuantumRange</var>+1)/2</td></tr>
				1290
				1291	<tr><th valign="middle">YIQ</th></tr>
				1292	<tr><td valign="middle">Y=0.298839R+0.586811G+0.114350*B; <var>intensity-like</var></td></tr>
				1293	<tr><td valign="middle">I=(0.59600R−0.27400G−0.32200B)(<var>QuantumRange</var>+1)/2</td></tr>
				1294	<tr><td valign="middle">Q=(0.21100R−0.52300G+0.31200B)(<var>QuantumRange</var>+1)/2</td></tr>
				1295
				1296	<tr><th valign="middle">YPbPr</th></tr>
				1297	<tr><td valign="middle">Y=0.2988390R+0.5868110G+0.1143500*B; <var>intensity-like</var></td></tr>
				1298	<tr><td valign="middle">Pb=(−0.168736R−0.331264G+0.500000B)(<var>QuantumRange</var>+1)/2</td></tr>
				1299	<tr><td valign="middle">Pr=(0.500000R−0.418688G−0.081312B)(<var>QuantumRange</var>+1)/2</td></tr>
				1300
				1301	<tr><th valign="middle">YUV</th></tr>
				1302	<tr><td valign="middle">Y=0.298839R+0.586811G+0.114350*B; <var>intensity-like</var></td></tr>
				1303	<tr><td valign="middle">U=(−0.14740R−0.28950G+0.43690B)(<var>QuantumRange</var>+1)/2</td></tr>
				1304	<tr><td valign="middle">V=(0.61500R−0.51500G−0.10000B)(<var>QuantumRange</var>+1)/2</td></tr>
				1305	</table>
				1306
				1307	<p>Note the scRGB colorspace requires HDRI support otherwise it behaves just like linear RGB.</p>
				1308
				1309	<div style="margin: auto;">
				1310	<h3 class="magick-header"><a id="combine"></a>-combine</h3>
				1311	</div>
				1312
				1313	<p class="magick-description">Combine one or more images into a single image.</p>
				1314
				1315	<p>The channels (previously set by <a href="command-line-options.html#channel">-channel</a>) of the
				1316	combined image are taken from the grayscale values of each image in the
				1317	sequence, in order. For the default -channel setting of <code>RGB</code>, this
				1318	means the first image is assigned to the <code>Red</code> channel, the second
				1319	to the <code>Green</code> channel, the third to the <code>Blue</code>.</p>
				1320
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1321	<p>This option can be thought of as the inverse to <a
				1322	href="command-line-options.html#separate">-separate</a>, so long as the channel settings are the same.
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1323	Thus, in the following example, the final image should be a copy of the
				1324	original. </p>
				1325
				1326	<pre>
				1327	convert original.png -channel RGB -separate sepimage.png
				1328	convert sepimage-0.png sepimage-1.png sepimage-2.png -channel RGB \
				1329	-combine imagecopy.png
				1330	</pre>
				1331
				1332	<div style="margin: auto;">
				1333	<h3 class="magick-header"><a id="comment"></a>-comment <var>string</var></h3>
				1334	</div>
				1335
				1336	<p class="magick-description">Embed a comment in an image.</p>
				1337
				1338	<p>This option sets the comment meta-data of an image read in after this
				1339	option has been given. To modify a comment of images already in memory use
				1340	"<code><a href="command-line-options.html#set">-set</a> comment</code>". </p>
				1341
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1342	<p>The comment can contain special format characters listed in the <a
				1343	href="escape.html">Format and
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1344	Print Image Properties</a>. These attributes are expanded when the comment
				1345	is finally assigned to the individual images. </p>
				1346
				1347	<p>If the first character of <var>string</var> is <var>@</var>, the image comment is read from a file titled by the
				1348	remaining characters in the string. Comments read in from a file are literal;
				1349	no embedded formatting characters are recognized.</p>
				1350
				1351	<p>Comment meta-data are not visible on the image itself. To do that use the
				1352	<a href="command-line-options.html#annotate">-annotate</a> or <a href="command-line-options.html#draw">-draw</a> options
				1353	instead.</p>
				1354
				1355	<p>For example,</p>
				1356
				1357	<pre>
				1358	-comment "%m:%f %wx%h" bird.miff
				1359	</pre>
				1360
				1361	<p>produces an image comment of <code>MIFF:bird.miff 512x480</code> (assuming
				1362	that the image <code>bird.miff</code> has a width of 512 and a height of
				1363	480.</p>
				1364
				1365	<div style="margin: auto;">
				1366	<h3 class="magick-header"><a id="compare"></a>-compare</h3>
				1367	</div>
				1368
				1369	<p class="magick-description">mathematically and visually annotate the difference between an image and its reconstruction</p>
				1370
				1371	<p>This is a convert version of "<code>compare</code>" for two same sized images. The syntax is as follows, but other metrics are allowed.</p>
				1372
				1373	<pre>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1374	convert image.png reference.png -metric RMSE -compare \ <br/> difference.png
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1375	</pre>
				1376
				1377	<p>To get the metric value use the string format "%[distortion]".</p>
				1378
				1379	<pre>
				1380	convert image.png reference.png -metric RMSE -compare -format \
				1381	"%[distortion]" info:
				1382	</pre>
				1383
				1384	<div style="margin: auto;">
				1385	<h3 class="magick-header"><a id="complex"></a>-complex <var>operator</var></h3>
				1386	</div>
				1387
				1388	<p class="magick-description">perform complex mathematics on an image sequence</p>
				1389
				1390	Choose from these operators:
				1391
				1392	<pre>
				1393	add
				1394	conjugate
				1395	divide
				1396	magnitude-phase
				1397	multiply
				1398	real-imaginary
				1399	subtract
				1400	</pre>
				1401
				1402	<p>Optionally specify the <code>divide</code> operator SNR with <code><a href="command-line-options.html#define">-define</a> complex:snr=float</code>.</p>
				1403
				1404	<div style="margin: auto;">
				1405	<h3 class="magick-header"><a id="compose"></a>-compose <var>operator</var></h3>
				1406	</div>
				1407
				1408	<p class="magick-description">Set the type of image composition.</p>
				1409
				1410	<p>See <a href="compose.html">Alpha Compositing</a> for
				1411	a detailed discussion of alpha compositing.</p>
				1412
				1413	<p>This setting effects image processing operators that merge two (or more)
				1414	images together in some way. This includes the operators,
				1415	<a href="command-line-options.html#composite">-compare</a>,
				1416	<a href="command-line-options.html#composite">-composite</a>,
				1417	<a href="command-line-options.html#layers">-layers</a> composite,
				1418	<a href="command-line-options.html#flatten">-flatten</a>,
				1419	<a href="command-line-options.html#mosaic">-mosaic</a>,
				1420	<a href="command-line-options.html#layers">-layers</a> merge,
				1421	<a href="command-line-options.html#border">-border</a>,
				1422	<a href="command-line-options.html#frame">-frame</a>,
				1423	and <a href="command-line-options.html#extent">-extent</a>. </p>
				1424
				1425	<p>It is also one of the primary options for the "<code>composite</code>"
				1426	command. </p>
				1427
				1428
				1429	<div style="margin: auto;">
				1430	<h3 class="magick-header"><a id="composite"></a>-composite</h3>
				1431	</div>
				1432
				1433	<p class="magick-description">Perform alpha composition on two images and an optional mask</p>
				1434
				1435	<p>Take the first image 'destination' and overlay the second 'source' image
				1436	according to the current <a href="command-line-options.html#compose">-compose</a> setting. The location
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1437	of the 'source' or 'overlay' image is controlled according to <a
Cristy	e93be68	2015-11-26 09:07:51 -0500	[diff] [blame]	1438	href="command-line-options.html#gravity" >-gravity</a>, and <a href="command-line-options.html#geometry" >-geometry</a>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1439	settings. </p>
				1440
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	1441	<p>If a third image is given this is treated as a grayscale blending 'mask' image
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1442	relative to the first 'destination' image. This mask is blended with the
				1443	source image. However for the '<code>displace</code>' compose method, the
				1444	mask is used to provide a separate Y-displacement image instead. </p>
				1445
				1446	<p>If a <a href="command-line-options.html#compose">-compose</a> method requires extra numerical
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1447	arguments or flags these can be provided by setting the <a
				1448	href="command-line-options.html#set">-set</a> '<code>option:compose:args</code>'
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1449	appropriately for the compose method. </p>
				1450
				1451	<p>Some <a href="command-line-options.html#compose">-compose</a> methods can modify the 'destination'
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1452	image outside the overlay area. You can disable this by setting the special <a
				1453	href="command-line-options.html#set">-set</a> '<code>option:compose:outside-overlay</code>'
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1454	to '<code>false</code>'. </p>
				1455
				1456	<p>The SVG compositing specification requires that color and opacity values range between zero and QuantumRange inclusive. You can permit values outside this range with this option: <a href="command-line-options.html#set">-set</a> '<code>option:compose:clamp=false</code></p>
				1457
				1458
				1459	<div style="margin: auto;">
				1460	<h3 class="magick-header"><a id="compress"></a>-compress <var>type</var></h3>
				1461	</div>
				1462
				1463	<p class="magick-description">Use pixel compression specified by <var>type</var> when writing the image.</p>
				1464
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1465	<p>Choices are: <code>None</code>, <code>BZip</code>, <code
				1466	>Fax</code>, <code>Group4</code>, <code
				1467	>JPEG</code>, <code>JPEG2000</code>, <code
				1468	>Lossless</code>, <code>LZW</code>, <code
				1469	>RLE</code> or <code>Zip</code>.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1470
				1471	<p>To print a complete list of compression types, use <a href="command-line-options.html#list">-list
				1472	compress</a>.</p>
				1473
				1474	<p>Specify <a href="command-line-options.html#compress">+compress</a> to store the binary image in an
				1475	uncompressed format. The default is the compression type of the specified
				1476	image file.</p>
				1477
				1478	<p>If <code>LZW</code> compression is specified but LZW compression has not been
				1479	enabled, the image data is written in an uncompressed LZW format that can be
				1480	read by LZW decoders. This may result in larger-than-expected GIF files.</p>
				1481
				1482	<p><code>Lossless</code> refers to lossless JPEG, which is only available if the
				1483	JPEG library has been patched to support it. Use of lossless JPEG is generally
				1484	not recommended.</p>
				1485
				1486	<p>
				1487	When writing an ICO file, you may request that the images be encoded in
				1488	PNG format, by specifying <code>Zip</code> compression.</p>
				1489
				1490	<p>
				1491	When writing a JNG file, specify <code>Zip</code> compression to request that
				1492	the alpha channel be encoded in PNG "IDAT" format, or <code>JPEG</code>
				1493	to request that it be encoded in JPG "JDAA" format.</p>
				1494
				1495	<p>Use the <a href="command-line-options.html#quality">-quality</a> option to set the compression level
				1496	to be used by JPEG, PNG, MIFF, and MPEG encoders.
				1497	Use the <a href="command-line-options.html#sampling-factor">-sampling-factor</a> option to set the
				1498	sampling factor to be used by JPEG, MPEG, and YUV encoders for down-sampling
				1499	the chroma channels.</p>
				1500
				1501	<div style="margin: auto;">
				1502	<h3 class="magick-header"><a id="connected-components"></a>-connected-components <var>connectivity</var></h3>
				1503	</div>
				1504
Cristy	ce4a355	2015-12-14 13:53:35 -0500	[diff] [blame]	1505	<p class="magick-description"><a href="connected-components.html">connected-components</a> labeling detects connected regions in an image, choose from 4 or 8 way connectivity.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1506
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1507	<p>Use <code><a href="command-line-options.html#define" >-define</a> connected-components:verbose=true</code> to output statistics associated with each unique label.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1508
				1509	<div style="margin: auto;">
				1510	<h3 class="magick-header"><a id="contrast"></a>-contrast</h3>
				1511	</div>
				1512
				1513	<p class="magick-description">Enhance or reduce the image contrast.</p>
				1514
				1515	<p>This option enhances the intensity differences between the lighter and
				1516	darker elements of the image. Use <a href="command-line-options.html#contrast">-contrast</a> to enhance
				1517	the image or <a href="command-line-options.html#contrast">+contrast</a> to reduce the image
				1518	contrast.</p>
				1519
				1520	<p>For a more pronounced effect you can repeat the option:</p>
				1521
				1522	<pre>
				1523	convert rose: -contrast -contrast rose_c2.png
				1524	</pre>
				1525
				1526	<div style="margin: auto;">
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	1527	<h3 class="magick-header"><a id="contrast-stretch"></a>-contrast-stretch <var>black-point</var><br />-contrast-stretch <var>black-point</var>{x<var>white-point</var>}{<var>%</var>}</h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1528	</div>
				1529
				1530	<p class="magick-description">Increase the contrast in an image by <var>stretching</var> the range of intensity values.</p>
				1531
				1532	<p>While performing the stretch, black-out at most <var>black-point</var> pixels and white-out at most <var>white-point</var> pixels. Or, if percent is used, black-out at most
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1533	<var >black-point %</var> pixels and white-out at most <var>white-point %</var> pixels.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1534
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1535	<p>Prior to ImageMagick 6.4.7-0, <a href="command-line-options.html#contrast-stretch"
				1536	>-contrast-stretch</a> will black-out at most <var>black-point</var> pixels and white-out at most <var >total pixels
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1537	minus white-point</var> pixels. Or, if percent is used, black-out at most <var>black-point %</var> pixels and white-out at most <var>100% minus white-point %</var> pixels.</p>
				1538
				1539	<p>Note that <code>-contrast-stretch 0</code> will modify the image such that
				1540	the image's min and max values are stretched to 0 and <var>QuantumRange</var>, respectively, without any loss of data due to burn-out or
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1541	clipping at either end. This is not the same as <a href="command-line-options.html#normalize"
				1542	>-normalize</a>, which is equivalent to <code>-contrast-stretch 0.15x0.05%</code> (or
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1543	prior to ImageMagick 6.4.7-0, <code>-contrast-stretch 2%x99%</code>).</p>
				1544
				1545	<p>Internally operator works by creating a histogram bin, and then uses that
				1546	bin to modify the image. As such some colors may be merged together when they
				1547	originally fell into the same 'bin'. </p>
				1548
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	1549	<p>All the channels are normalized in concert by the same amount so as to
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1550	preserve color integrity, when the default <a href="command-line-options.html#channel" >+channel</a>
				1551	setting is in use. Specifying any other <a href="command-line-options.html#channel" >-channel</a>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1552	setting will normalize the RGB channels independently.</p>
				1553
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1554	<p>See also <a href="command-line-options.html#auto-level" >-auto-level</a> for a 'perfect'
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1555	normalization of mathematical images. </p>
				1556
				1557	<p>This operator is under review for re-development. </p>
				1558
				1559
				1560	<div style="margin: auto;">
				1561	<h3 class="magick-header"><a id="convolve"></a>-convolve <var>kernel</var></h3>
				1562	</div>
				1563
				1564	<p class="magick-description">Convolve an image with a user-supplied convolution kernel.</p>
				1565
				1566	<p>The <var>kernel</var> is a matrix specified as
				1567	a comma-separated list of integers (with no spaces), ordered left-to right,
				1568	starting with the top row. Presently, only odd-dimensioned kernels are
				1569	supported, and therefore the number of entries in the specified <var>kernel</var> must be 3<sup>2</sup>=9, 5<sup>2</sup>=25,
				1570	7<sup>2</sup>=49, etc. </p>
				1571
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1572	<p>Note that the <a href="command-line-options.html#convolve">‑convolve</a> operator supports the <a href="command-line-options.html#bias">‑bias</a> setting. This option shifts the convolution so that
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1573	positive and negative results are relative to a user-specified bias value.
				1574	This is important for non-HDRI compilations of ImageMagick when dealing with
				1575	convolutions that contain negative as well as positive values. This is
				1576	especially the case with convolutions involving high pass filters or edge
				1577	detection. Without an output bias, the negative values is clipped at zero.
				1578	</p>
				1579
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1580	<p>When using an ImageMagick with the HDRI compile-time setting, <a href="command-line-options.html#bias">‑bias</a> is not needed, as ImageMagick is able to store/handle any
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1581	negative results without clipping to the color value range (0..QuantumRange).
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1582	See the discussion on HDRI implementations of ImageMagick on the page <a
				1583	href="high-dynamic-range.html">High
				1584	Dynamic-Range Images</a>. For more about HDRI go the ImageMagick <a
Cristy	364a72f	2016-11-04 22:38:41 -0400	[diff] [blame]	1585	href="https://www.imagemagick.org/Usage/basics/#hdri">Usage</a> pages or this
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1586	<a href="http://en.wikipedia.org/wiki/High_dynamic_range_imaging">Wikipedia</a>
				1587	entry. </p>
				1588
				1589
				1590	<div style="margin: auto;">
				1591	<h3 class="magick-header"><a id="copy"></a>-copy <var>geometry</var> <var>offset</var></h3>
				1592	</div>
				1593
				1594	<p class="magick-description">copy pixels from one area of an image to another.</p>
				1595
				1596	<div style="margin: auto;">
				1597	<h3 class="magick-header"><a id="crop"></a>-crop <var>geometry</var>{<var>@</var>}{<var>!</var>}</h3>
				1598	</div>
				1599
				1600	<p class="magick-description">Cut out one or more rectangular regions of the image.</p>
				1601
				1602	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				1603
				1604	<p>The <var>width</var> and <var>height</var> of the <var>geometry</var> argument give the size of the image that remains
				1605	after cropping, and <var>x</var> and <var>y</var> in the
				1606	<var>offset</var> (if present) gives the location of the top left
				1607	corner of the cropped image with respect to the original image. To specify the
				1608	amount to be removed, use <a href="command-line-options.html#shave">-shave</a> instead.</p>
				1609
				1610	<p>If the <var>x</var> and <var>y</var> offsets are
				1611	present, a single image is generated, consisting of the pixels from the
				1612	cropping region. The offsets specify the location of the upper left corner of
				1613	the cropping region measured downward and rightward with respect to the upper
				1614	left corner of the image. If the <a href="command-line-options.html#gravity">-gravity</a> option is
				1615	present with <code>NorthEast</code>, <code>East</code>, or <code>SouthEast</code>
				1616	gravity, it gives the distance leftward from the right edge of the image to
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1617	the right edge of the cropping region. Similarly, if the <a
				1618	href="command-line-options.html#gravity">-gravity</a> option is present with <code>SouthWest</code>,
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1619	<code>South</code>, or <code>SouthEast</code> gravity, the distance is measured
				1620	upward between the bottom edges.</p>
				1621
				1622	<p>If the <var>x</var> and <var>y</var> offsets are
				1623	omitted, a set of tiles of the specified geometry, covering the entire input
				1624	image, is generated. The rightmost tiles and the bottom tiles are smaller if
				1625	the specified geometry extends beyond the dimensions of the input image.</p>
				1626
				1627	<p>You can add the <var>@</var> to the geometry argument to equally divide the image into the number of tiles generated.</p>
				1628
				1629	<p>By adding a exclamation character flag to the geometry argument, the
				1630	cropped images virtual canvas page size and offset is set as if the
				1631	geometry argument was a viewport or window. This means the canvas page size
				1632	is set to exactly the same size you specified, the image offset set
				1633	relative top left corner of the region cropped. </p>
				1634
				1635	<p>If the cropped image 'missed' the actual image on its virtual canvas, a
				1636	special single pixel transparent 'missed' image is returned, and a 'crop
				1637	missed' warning given. </p>
				1638
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1639	<p>It might be necessary to <a href="command-line-options.html#repage" >+repage</a> the image prior to
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1640	cropping the image to ensure the crop coordinate frame is relocated to the
				1641	upper-left corner of the visible image.
				1642
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1643	Similarly you may want to use <a href="command-line-options.html#repage" >+repage</a> after cropping to
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1644	remove the page offset that will be left behind. This is especially true when
				1645	you are going to write to an image format such as PNG that supports an image
				1646	offset.</p>
				1647
				1648	<div style="margin: auto;">
				1649	<h3 class="magick-header"><a id="cycle"></a>-cycle <var>amount</var></h3>
				1650	</div>
				1651
				1652	<p class="magick-description">displace image colormap by amount.</p>
				1653
				1654	<p><var>Amount</var> defines the number of positions each
				1655	colormap entry is shifted.</p>
				1656
				1657
				1658	<div style="margin: auto;">
				1659	<h3 class="magick-header"><a id="debug"></a>-debug <var>events</var></h3>
				1660	</div>
				1661
				1662	<p class="magick-description">enable debug printout.</p>
				1663
				1664	<p>The <code>events</code> parameter specifies which events are to be logged. It
				1665	can be either <code>None</code>, <code>All</code>, <code>Trace</code>, or
				1666	a comma-separated list consisting of one or more of the following domains:
				1667	<code>Accelerate</code>, <code>Annotate</code>, <code>Blob</code>, <code>Cache</code>,
				1668	<code>Coder</code>, <code>Configure</code>, <code>Deprecate</code>,
				1669	<code>Exception</code>, <code>Locale</code>, <code>Render</code>,
				1670	<code>Resource</code>, <code>Security</code>, <code>TemporaryFile</code>,
				1671	<code>Transform</code>, <code>X11</code>, or <code>User</code>. </p>
				1672
				1673
				1674	<p>For example, to log cache and blob events, use.</p>
				1675
				1676	<pre>
				1677	convert -debug "Cache,Blob" rose: rose.png
				1678	</pre>
				1679
				1680	<p>The <code>User</code> domain is normally empty, but developers can log user
				1681	events in their private copy of ImageMagick.</p>
				1682
				1683	<p>To print the complete list of debug methods, use <a href="command-line-options.html#list">-list
				1684	debug</a>.</p>
				1685
				1686	<p>Use the <a href="command-line-options.html#log">-log</a> option to specify the format for debugging
				1687	output.</p>
				1688
				1689	<p>Use <a href="command-line-options.html#debug">+debug</a> to turn off all logging.</p>
				1690
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1691	<p>Debugging may also be set using the <code>MAGICK_DEBUG</code> <a href="resources.html#environment"
				1692	>environment variable</a>. The allowed values for the <code>MAGICK_DEBUG</code>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1693	environment variable are the same as for the <a href="command-line-options.html#debug">-debug</a>
				1694	option.</p>
				1695
				1696
				1697	<div style="margin: auto;">
				1698	<h3 class="magick-header"><a id="decipher"></a>-decipher <var>filename</var></h3>
				1699	</div>
				1700
				1701	<p class="magick-description">Decipher and restore pixels that were previously transformed by <a href="command-line-options.html#encipher">-encipher</a>.</p>
				1702
				1703	<p>Get the passphrase from the file specified by <var>filename</var>.</p>
				1704
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1705	<p>For more information, see the webpage, <a
Cristy	364a72f	2016-11-04 22:38:41 -0400	[diff] [blame]	1706	href="https://www.imagemagick.org/www/cipher.html">ImageMagick: Encipher or
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1707	Decipher an Image</a>.</p>
				1708
				1709
				1710	<div style="margin: auto;">
				1711	<h3 class="magick-header"><a id="deconstruct"></a>-deconstruct</h3>
				1712	</div>
				1713
				1714	<p class="magick-description">find areas that has changed between images </p>
				1715
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1716	<p>Given a sequence of images all the same size, such as produced by <a
				1717	href="command-line-options.html#coalesce">-coalesce</a>, replace the second and later images, with
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1718	a smaller image of just the area that changed relative to the previous image.
				1719	</p>
				1720
				1721	<p>The resulting sequence of images can be used to optimize an animation
				1722	sequence, though will not work correctly for GIF animations when parts of the
				1723	animation can go from opaque to transparent. </p>
				1724
				1725	<p>This option is actually equivalent to the <a href="command-line-options.html#layers">-layers</a>
				1726	method '<code>compare-any</code>'. </p>
				1727
				1728
				1729	<div style="margin: auto;">
				1730	<h3 class="magick-header"><a id="define"></a>-define <var>key</var>{<var>=value</var>}<var>...</var></h3>
				1731	</div>
				1732
				1733	<p class="magick-description">add specific global settings generally used to control coders and image processing operations.</p>
				1734
				1735	<p>This option creates one or more definitions for coders and decoders to use
				1736	while reading and writing image data. Definitions are generally used to
				1737	control image file format coder modules, and image processing operations,
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1738	beyond what is provided by normal means. Defined settings are listed in <a
				1739	href="command-line-options.html#verbose" >-verbose</a> information ("<code>info:</code>" output format)
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1740	as "Artifacts". </p>
				1741
				1742	<p>If <var>value</var> is missing for a definition, an empty-valued
				1743	definition of a flag is created with that name. This used to control on/off
				1744	options. Use <a href="command-line-options.html#define">+define key</a> to remove definitions
				1745	previously created. Use <a href="command-line-options.html#define">+define "*"</a> to remove all
				1746	existing definitions.</p>
				1747
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1748	<p>The same 'artifact' settings can also be defined using the <a
				1749	href="command-line-options.html#set" >-set "option:<var>key</var>" "<var>value</var>"</a> option, which also allows the use of <a href="escape.html" >Format and Print Image
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1750	Properties</a> in the defined value. </p>
				1751
				1752	<p>The <var>option</var> and <var>key</var> are case-independent (they are
				1753	converted to lowercase for use within the decoders) while the <var>value</var>
				1754	is case-dependent.</p>
				1755
				1756	<p>Such settings are global in scope, and affect all images and operations. </p>
				1757
				1758	<p>The following definitions are just some of the artifacts that are
				1759	available:</p>
				1760
				1761	<table class="table table-condensed table-striped">
				1762	<tr>
Cristy	e077971	2016-07-30 17:25:22 -0400	[diff] [blame]	1763	<td>bmp:alpha=<var>true\|false</var></td>
				1764	<td>include any alpha channel when writing in the BMP image format.</td>
				1765	</tr>
				1766
				1767	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1768	<td>bmp:format=<var>value</var></td>
				1769	<td> valid values are <var>bmp2</var>, <var>bmp3</var>,
				1770	and <var>bmp4</var>. This option can be useful when the
				1771	method of prepending "BMP2:" to the output filename is inconvenient or
				1772	is not available, such as when using the <a href="mogrify.html">mogrify</a> utility.</td>
				1773	</tr>
				1774
				1775	<tr>
				1776	<td>colorspace:auto-grayscale=<var>on\|off</var></td>
				1777	<td>prevent automatic conversion to grayscale inside coders that support
				1778	grayscale. This should be accompanied by -type truecolor. PNG and TIF do
				1779	not need this define. With PNG, just use PNG24:image. With TIF, just use
				1780	-type truecolor. JPG and PSD will need this define.</td>
				1781	</tr>
				1782
				1783	<tr>
				1784	<td>complex:snr=<var>value</var></td>
				1785	<td>Set the divide SNR constant<a href="command-line-options.html#complex">-complex</a></td>
				1786	</tr>
				1787
				1788	<tr>
				1789	<td>compose:args=<var>arguments</var></td>
				1790	<td>Sets certain compose argument values when using convert ... -compose ...
Cristy	1f1f3a0	2016-06-01 07:25:42 -0400	[diff] [blame]	1791	-composite. See <a href="compose.html"
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1792	>Image Composition</a></td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1793	</tr>
				1794
				1795	<tr>
				1796	<td>compose:clamp=<var>on\|off</var></td>
				1797	<td>set each pixel whose value is below zero to zero and any the pixel whose value is above the quantum range to the quantum range (e.g. 65535) otherwise the pixel value remains unchanged. Define supported in ImageMagick 6.9.1-3 and above.</td>
				1798	</tr>
				1799
				1800	<tr>
Cristy	de27d76	2016-01-02 12:56:44 -0500	[diff] [blame]	1801	<td>connected-components:area-threshold=<var>value</var></td>
				1802	<td>Merges any region with area smaller than <var>value</var> into its surrounding region or largest neighbor.</td>
				1803	</tr>
				1804
				1805	<tr>
				1806	<td>connected-components:keep=<var>list-of-ids</var></td>
Cristy	e077971	2016-07-30 17:25:22 -0400	[diff] [blame]	1807	<td>Comma and/or hyphenated list of id values to keep in the output. Supported in Imagemagick 6.9.3-0.</td>
Cristy	de27d76	2016-01-02 12:56:44 -0500	[diff] [blame]	1808	</tr>
				1809
				1810	<tr>
				1811	<td>connected-components:mean-color=<var>true</var></td>
				1812	<td>Changes the output image from id values to mean color values. Supported in Imagemagick 6.9.2-8.</td>
				1813	</tr>
				1814
				1815	<tr>
				1816	<td>connected-components:remove=<var>list-of-ids</var></td>
Cristy	e077971	2016-07-30 17:25:22 -0400	[diff] [blame]	1817	<td>Comma and/or hyphenated list of id values to remove from the output. Supported in Imagemagick 6.9.2-9.</td>
Cristy	de27d76	2016-01-02 12:56:44 -0500	[diff] [blame]	1818	</tr>
				1819
				1820	<tr>
				1821	<td>connected-components:verbose=<var>true</var></td>
				1822	<td>Lists id, bounding box, centroid, area, mean color for each region.</td>
				1823	</tr>
				1824
				1825	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1826	<td>convolve:scale=<var>{kernel_scale}[!^] [,{origin_addition}] [%]</var></td>
				1827	<td>Defines the kernel scaling. The special flag ! automatically scales to
				1828	full dynamic range. The ! flag can be used in combination with a factor or
				1829	percent. The factor or percent is then applied after the automatic scaling.
				1830	An example is 50%!. This produces a result 50% darker than full dynamic
				1831	range scaling. The ^ flag assures the kernel is 'zero-summing', for
				1832	example when some values are positive and some are negative as in edge
				1833	detection kernels. The origin addition adds that value to the center
				1834	pixel of the kernel. This produces and effect that is like adding the image
				1835	that many times to the result of the filtered image. The typical value
				1836	is 1 so that the original image is added to the result of the convolution.
				1837	The default is 0.</td>
				1838	</tr>
				1839
				1840	<tr>
				1841	<td>convolve:showkernel=<var>1</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1842	<td>Outputs (to 'standard error') all the information about a specified <a
				1843	href="command-line-options.html#morphology" >-morphology convolve</a> kernel.</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1844	</tr>
				1845
				1846	<tr>
				1847	<td>dcm:display-range=<var>reset</var></td>
				1848	<td>Sets the display range to the minimum and maximum pixel values for the
				1849	DCM image format.</td>
				1850	</tr>
				1851
				1852	<tr>
				1853	<td>dds:cluster-fit=<var>true\|false</var></td>
				1854	<td>Enables the dds cluster-fit.</td>
				1855	</tr>
				1856
				1857	<tr>
				1858	<td>dds:compression=<var>dxt1\|dxt5\|none</var></td>
				1859	<td>Sets the dds compression.</td>
				1860	</tr>
				1861
				1862	<tr>
				1863	<td>dds:mipmaps=<var>value</var></td>
				1864	<td>Sets the dds number of mipmaps.</td>
				1865	</tr>
				1866
				1867	<tr>
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame^]	1868	<td>dds:weight-by-alpha=<var>true\|false</var></td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1869	<td>Enables the dds alpha weighting.</td>
				1870	</tr>
				1871
				1872	<tr>
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame^]	1873	<td>deskew:auto-crop=<var>true</var></td>
				1874	<td>auto crop the image after deskewing.</td>
				1875	</tr>
				1876
				1877	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1878	<td>delegate:bimodal=<var>true</var></td>
				1879	<td>Specifies direct conversion from Postscript to PDF.</td>
				1880	</tr>
				1881
				1882	<tr>
				1883	<td>distort:scale=<var>value</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1884	<td>Sets the output scaling factor for use with <a href="command-line-options.html#distort"
				1885	>-distort</a></td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1886	</tr>
				1887
				1888	<tr>
				1889	<td>distort:viewport=<var>WxH+X+Y</var></td>
				1890	<td>Sets the viewport for use with <a href="command-line-options.html#distort">-distort</a></td>
				1891	</tr>
				1892
				1893	<tr>
				1894	<td>dot:layout-engine=<var>value</var></td>
				1895	<td>Specifies the layout engine for the DOT image format (e.g.
				1896	<code>neato</code>).</td>
				1897	</tr>
				1898
				1899	<tr>
				1900	<td>filter:option=<var>value</var></td>
				1901	<td>Set a filter option for use with <a href="command-line-options.html#resize">-resize</a>.
				1902	See <a href="command-line-options.html#filter">-filter</a> for details.</td>
				1903	</tr>
				1904
				1905	<tr>
				1906	<td>fourier:normalize=<var>inverse</var></td>
				1907	<td>Sets the location for the FFT/IFT normalization as use by
				1908	<a href="command-line-options.html#fft">+-fft</a> and <a href="command-line-options.html#ift">+-ift</a>. The default is
				1909	<var>forward</var>.</td>
				1910	</tr>
				1911
				1912	<tr>
				1913	<td>h:format=<var>value</var></td>
				1914	<td>Set the image encoding format use when writing a C-style header.
				1915	<var>format</var> can be any output format supported by ImageMagick
				1916	except for <var>h</var> and <var>magick</var></td>. If this
				1917	option is omitted, the default is <var>GIF</var> for PseudoClass
				1918	images and <var>PNM</var> for DirectClass images.
				1919	</tr>
				1920
				1921	<tr>
				1922	<td>icon:auto-resize</td>
				1923	<td>Automatically stores multiple sizes when writing an ico image
				1924	(requires a 256x256 input image).</td>
				1925	</tr>
				1926
				1927	<tr>
				1928	<td>jp2:layer-number=<var>value</var></td>
				1929	<td>Sets the maximum number of quality layers to decode. Same for JPT, JC2,
				1930	and J2K</td>
				1931	</tr>
				1932
				1933	<tr>
				1934	<td>jp2:number-resolutions=<var>value</var></td>
				1935	<td>Sets the number of resolutions to encode.Same for JPT, JC2, and J2K</td>
				1936	</tr>
				1937
				1938	<tr>
				1939	<td>jp2:progression-order=<var>value</var></td>
				1940	<td>choose from LRCP, RLCP, RPCL, PCRL or CPRL. Same for JPT, JC2, and
				1941	J2K</td>
				1942	</tr>
				1943
				1944	<tr>
				1945	<td>jp2:quality=<var>value,value...</var></td>
				1946	<td>Sets the quality layer PSNR, given in dB. The order is from left to
				1947	right in ascending order. The default is a single lossless quality layer.
				1948	Same for JPT, JC2, and J2K</td>
				1949	</tr>
				1950
				1951	<tr>
				1952	<td>jp2:rate=<var>value</var></td>
				1953	<td>Specify the compression factor to use while writing JPEG-2000 files. The
				1954	compression factor is the reciprocal of the compression ratio. The valid
				1955	range is 0.0 to 1.0, with 1.0 indicating lossless compression. If defined,
				1956	this value overrides the -quality setting. A quality setting of 75
				1957	results in a rate value of 0.06641. Same for JPT, JC2, and J2K</td>
				1958	</tr>
				1959
				1960	<tr>
				1961	<td>jp2:reduce-factor=<var>value</var></td>
				1962	<td>Sets the number of highest resolution levels to be discarded.Same for
				1963	JPT, JC2, and J2K</td>
				1964	</tr>
				1965
				1966	<tr>
				1967	<td>jpeg:block-smoothing=<var>on\|off</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1968	<td>&nbsp</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1969	</tr>
				1970
				1971	<tr>
				1972	<td>jpeg:colors=<var>value</var></td>
				1973	<td>Set the desired number of colors and let the JPEG encoder do the
				1974	quantizing.</td>
				1975	</tr>
				1976
				1977	<tr>
				1978	<td>jpeg:dct-method=<var>value</var></td>
				1979	<td>Choose from <code>default</code>, <code>fastest</code>,
				1980	<code>float</code>, <code>ifast</code>, and <code>islow</code>.</td>
				1981	</tr>
				1982
				1983	<tr>
				1984	<td>jpeg:extent=<var>value</var></td>
				1985	<td>Restrict the maximum JPEG file size, for example <code>-define
				1986	jpeg:extent=400KB</code>. The JPEG encoder will search for the highest
				1987	compression quality level that results in an output file that does not
Cristy	e93be68	2015-11-26 09:07:51 -0500	[diff] [blame]	1988	exceed the value. The <code>-quality</code> option also will be respected
				1989	starting with version 6.9.2-5. Between 6.9.1-0 and 6.9.2-4, add -quality
				1990	100 in order for the jpeg:extent to work properly. Prior to 6.9.1-0, the
				1991	-quality setting was ignored.</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1992	</tr>
				1993
				1994	<tr>
				1995	<td>jpeg:fancy-upsampling=<var>on\|off</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1996	<td>&nbsp</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1997	</tr>
				1998
				1999	<tr>
				2000	<td>jpeg:optimize-coding=<var>on\|off</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2001	<td>&nbsp</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2002	</tr>
				2003
				2004	<tr>
				2005	<td>jpeg:q-table=<var>table</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2006	<td>&nbsp</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2007	</tr>
				2008
				2009	<tr>
				2010	<td>jpeg:sampling-factor=<var>sampling-factor-string</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2011	<td>&nbsp</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2012	</tr>
				2013
				2014	<tr>
				2015	<td>jpeg:size=<var>geometry</var></td>
				2016	<td>Set the size hint of a JPEG image, for
				2017	example, <code>-define jpeg:size=128x128</code>.
				2018	It is most useful for increasing performance and reducing the memory
				2019	requirements when reducing the size of a large JPEG image.</td>
				2020	</tr>
				2021
				2022	<tr>
				2023	<td>json:features</td>
				2024	<td>includes features in verbose information</td>
				2025	</tr>
				2026
				2027	<tr>
				2028	<td>json:limit</td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2029	<td>&nbsp</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2030	</tr>
				2031
				2032	<tr>
				2033	<td>json:locate</td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2034	<td>&nbsp</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2035	</tr>
				2036
				2037	<tr>
				2038	<td>json:moments</td>
				2039	<td>includes image moments in verbose information</td>
				2040	</tr>
				2041
				2042	<tr>
				2043	<td>magick:format=<var>value</var></td>
				2044	<td>Set the image encoding format use when writing a C-style header.
				2045	This is the same as "h:format=format" described above.</td>.
				2046	</tr>
				2047
				2048	<tr>
				2049	<td>mng:need-cacheoff</td>
				2050	<td>turn playback caching off for streaming MNG.</td>
				2051	</tr>
				2052
				2053	<tr>
				2054	<td>morphology:compose=<var>compose-method</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2055	<td>Specifies how to merge results generated by multiple<a
				2056	href="command-line-options.html#morphology" >-morphology</a> kernel. The default is none. One
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2057	typical value is 'lighten' as used, for example, with the sobel edge
				2058	kernels. </td>
				2059	</tr>
				2060
				2061	<tr>
				2062	<td>morphology:showkernel=<var>1</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2063	<td>Outputs (to 'standard error') all the information about a generated <a
				2064	href="command-line-options.html#morphology" >-morphology</a> kernel.</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2065	</tr>
				2066
				2067	<tr>
				2068	<td>pcl:fit-to-page=<var>true</var></td>
				2069
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2070	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2071	<td>pdf:fit-page=<var>geometry</var></td>
				2072	<td> geometry specifies the scaling dimensions for resizing when the PDF is
				2073	being read. The geometry is either WxH{%} or page size. No offsets are
				2074	allowed. (introduced in IM 6.8.8-8)</td>
				2075	</tr>
				2076
				2077	<tr>
				2078	<td>pdf:fit-to-page=<var>true</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2079	<td>&nbsp</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2080	</tr>
				2081
				2082	<tr>
				2083	<td>pdf:use-cropbox=<var>true</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2084	<td>&nbsp</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2085	</tr>
				2086
				2087	<tr>
				2088	<td>pdf:use-trimbox=<var>true</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2089	<td>&nbsp</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2090	</tr>
				2091
				2092	<tr>
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame^]	2093	<td>phash:colorspaces=<var>colorspace,colorspace,...</var></td>
				2094	<td>the perceptual hash defaults to the sRGB and HCLp colorspaces. Use this define, you can specify up to six alternative colorspaces.</td>
				2095	</tr>
				2096
				2097	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2098	<td>png:bit-depth=<var>value</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2099	<td>&nbsp</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2100	</tr>
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame^]	2101
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2102	<tr>
				2103	<td>png:color-type=<var>value</var></td>
				2104	<td>desired bit-depth and color-type for PNG output. You can force the PNG
				2105	encoder to use a different bit-depth and color-type than it would have
				2106	normally selected, but only if this does not cause any loss of image
				2107	quality. Any attempt to reduce image quality is treated as an error and no
				2108	PNG file is written. E.g., if you have a 1-bit black-and-white image, you
				2109	can use these "defines" to cause it to be written as an 8-bit grayscale,
				2110	indexed, or even a 64-bit RGBA. But if you have a 16-million color image,
				2111	you cannot force it to be written as a grayscale or indexed PNG. If you
				2112	wish to do this, you must use the appropriate <a href="command-line-options.html#depth">-depth</a>,
				2113	<a href="command-line-options.html#colors">-colors</a>, or <a href="command-line-options.html#type">-type</a> directives to
				2114	reduce the image quality prior to using the PNG encoder. Note that in
				2115	indexed PNG files, "bit-depth" refers to the number of bits per index,
				2116	which can be 1, 2, 4, or 8. In such files, the color samples always have
				2117	8-bit depth.</td>
				2118	</tr>
				2119
				2120	<tr>
				2121	<td>png:compression-filter=<var>value</var></td>
				2122	<td> valid values are 0 through 9. 0-4 are the corresponding PNG filters,
				2123	5 means adaptive filtering except for images with a colormap, 6 means
				2124	adaptive filtering for all images, 7 means MNG "loco" compression, 8 means
				2125	Z_RLE strategy with adaptive filtering, and 9 means Z_RLE strategy with no
				2126	filtering.</td>
				2127	</tr>
				2128
				2129	<tr>
				2130	<td>png:compression-level=<var>value</var></td>
				2131	<td> valid values are 0 through 9, with 0 providing the least but fastest
				2132	compression and 9 usually providing the best and always the slowest.</td>
				2133	</tr>
				2134
				2135	<tr>
				2136	<td>png:compression-strategy=<var>value</var></td>
				2137	<td> valid values are 0 through 4, meaning default, filtered, huffman_only,
				2138	rle, and fixed ZLIB compression strategy. If you are using an old zlib
				2139	that does not support Z_RLE (before 1.2.0) or Z_FIXED (before 1.2.2.2),
				2140	values 3 and 4, respectively, will use the zlib default strategy
				2141	instead.</td>
				2142	</tr>
				2143
				2144	<tr>
				2145	<td>png:format=<var>value</var></td>
				2146	<td> valid values are <var>png8</var>, <var>png24</var>,
				2147	<var>png32</var>, <var>png48</var>,
				2148	<var>png64</var>, and <var>png00</var>.
				2149	This property can be useful for specifying
				2150	the specific PNG format to be used, when the usual method of prepending the
				2151	format name to the output filename is inconvenient, such as when writing
				2152	a PNG-encoded ICO file or when using <a href="mogrify.html">mogrify</a>.
				2153	Value = <var>png8</var> reduces the number of colors to 256,
				2154	only one of which may be fully transparent, if necessary. The other
				2155	values do not force any reduction of quality; it is an error to request
				2156	a format that cannot represent the image data without loss (except that
				2157	it is allowed to reduce the bit-depth from 16 to 8 for all formats).
				2158	Value = <var>png24</var> and <var>png48</var>
				2159	allow transparency, only if a single color is fully transparent and that
				2160	color does not also appear in an opaque pixel; such transparency is
				2161	written in a PNG <code>tRNS</code> chunk.
				2162	Value = <var>png00</var> causes the image to inherit its
				2163	color-type and bit-depth from the input image, if the input was also
				2164	a PNG.</td>
				2165	</tr>
				2166
				2167	<tr>
				2168	<td>png:exclude-chunk=<var>value</var></td>
				2169
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2170	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2171	<td>png:include-chunk=<var>value</var></td>
				2172	<td>ancillary chunks to be excluded from or included in PNG output.
				2173
				2174	<p>The <var>value</var> can be the name of a PNG chunk-type such
				2175	as <var>bKGD</var>, a comma-separated list of chunk-names
				2176	(which can include the word <var>date</var>, the word
				2177	<var>all</var>, or the word <var>none</var>).
				2178	Although PNG chunk-names are case-dependent, you can use all lowercase
				2179	names if you prefer.</p>
				2180
				2181	<p>The "include-chunk" and "exclude-chunk" lists only affect the behavior
				2182	of the PNG encoder and have no effect on the PNG decoder.</p>
				2183
				2184	<p>As a special case, if the <code>sRGB</code> chunk is excluded and
				2185	the <code>gAMA</code> chunk is included, the <code>gAMA</code> chunk will
				2186	only be written if gamma is not 1/2.2, since most decoders assume
				2187	sRGB and gamma=1/2.2 when no colorspace information is included in
				2188	the PNG file. Because the list is processed from left to right, you
				2189	can achieve this with a single define:</p>
				2190
				2191	<pre>
				2192	-define png:include-chunk=none,gAMA
				2193	</pre>
				2194
				2195	<p>As a special case, if the <code>sRGB</code> chunk is not excluded and
				2196	the PNG encoder recognizes that the image contains the sRGB ICC profile,
				2197	the PNG encoder will write the <code>sRGB</code> chunk instead of the
				2198	entire ICC profile. To force the PNG encoder to write the sRGB
				2199	profile as an <code>iCCP</code> chunk in the output PNG instead of the
				2200	<code>sRGB</code> chunk, exclude the <code>sRGB</code> chunk.</p>
				2201
				2202	<p>The critical PNG chunks <code>IHDR</code>, <code>PLTE</code>,
				2203	<code>IDAT</code>, and <code>IEND</code> cannot be excluded. Any such
				2204	entries appearing in the list will be ignored.</p>
				2205
				2206	<p>If the ancillary PNG <code>tRNS</code> chunk is excluded and the
				2207	image has transparency, the PNG colortype is forced to be 4 or 6
				2208	(GRAY_ALPHA or RGBA). If the image is not transparent, then the
				2209	<code>tRNS</code> chunk isn't written anyhow, and there is no effect
				2210	on the PNG colortype of the output image.</p>
				2211
				2212	<p>The <a href="command-line-options.html#strip">-strip</a> option does the equivalent of the
				2213	following for PNG output:</p>
				2214
				2215	<pre>
				2216	-define png:exclude-chunk=EXIF,iCCP,iTXt,sRGB,tEXt,zCCP,zTXt,date
				2217	</pre>
				2218
				2219	<p>The default behavior is to include all known PNG ancillary chunks
				2220	plus ImageMagick's private <code>vpAg</code> ("virtual page") chunk,
				2221	and to exclude all PNG chunks that are unknown to ImageMagick,
				2222	regardless of their PNG "copy-safe" status as described in the
				2223	PNG specification.</p>
				2224
				2225	<p>Any chunk names that are not known to ImageMagick are ignored
				2226	if they appear in either the "include-chunk" or "exclude-chunk" list.
				2227	The ancillary chunks currently known to ImageMagick are
				2228	<code>bKGD</code>, <code>cHRM</code>, <code>gAMA</code>, <code>iCCP</code>,
				2229	<code>oFFs</code>, <code>pHYs</code>, <code>sRGB</code>, <code>tEXt</code>,
				2230	<code>tRNS</code>, <code>vpAg</code>, and <code>zTXt</code>.</p>
				2231
				2232	<p>You can also put <code>date</code> in the list to include or exclude
				2233	the "Date:create" and "Date:modify" text chunks that ImageMagick normally
				2234	inserts in the output PNG.</p></td>
				2235	</tr>
				2236
				2237	<tr>
				2238	<td>png:preserve-colormap[=<var>true</var>]</td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2239	<td>Use the existing image->colormap. Normally the PNG encoder will
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2240	try to optimize the palette, eliminating unused entries and putting
				2241	the transparent colors first. If this flag is set, that behavior
				2242	is suppressed.</td>
				2243	</tr>
				2244
				2245	<tr>
				2246	<td>png:preserve-iCCP[=<var>true</var>]</td>
				2247	<td>By default, the PNG decoder and encoder examine any ICC profile
				2248	that is present, either from an <code>iCCP</code> chunk in the PNG
				2249	input or supplied via an option, and if the profile is recognized
				2250	to be the sRGB profile, converts it to the <code>sRGB</code> chunk.
				2251	You can use <code>-define png:preserve-iCCP</code> to prevent
				2252	this from happening; in such cases the <code>iCCP</code> chunk
				2253	will be read or written and no <code>sRGB</code> chunk will be
				2254	written. There are some ICC profiles that claim to be sRGB but
				2255	have various errors that cause them to be rejected by libpng16; such
				2256	profiles are recognized anyhow and converted to the <code>sRGB</code>
				2257	chunk, but are rejected if the <code>-define png:preserve-iCCP</code>
				2258	is present. Note that not all "sRGB" ICC profiles are recognized
				2259	yet; we will add them to the list as we encounter them.</td>
				2260	</tr>
				2261
				2262	<tr>
				2263	<td>png:swap-bytes[=<var>true</var>]</td>
				2264	<td>The PNG specification requires that any multi-byte integers be stored in
				2265	network byte order (MSB-LSB endian). This option allows you to
				2266	fix any invalid PNG files that have 16-bit samples stored incorrectly
				2267	in little-endian order (LSB-MSB). The "-define png:swap-bytes" option
				2268	must appear before the input filename on the commandline. The swapping
				2269	is done during the libpng decoding operation.</td>
				2270	</tr>
				2271
				2272	<tr>
				2273	<td>profile:skip=<var>name1,name2,...</var></td>
				2274	<td>Skip the named profile[s] when reading the image. Use skip="*" to
				2275	skip all named profiles in the image. Many named profiles exist,
				2276	including ICC, EXIF, APP1, IPTC, XMP, and others.</td>
				2277	</tr>
				2278
				2279	<tr>
				2280	<td>ps:imagemask</td>
				2281	<td>If the ps:imagemask flag is defined, the PS3 and EPS3 coders will
				2282	create Postscript files that render bilevel images with the Postscript
				2283	imagemask operator instead of the image operator.</td>
				2284	</tr>
				2285
				2286	<tr>
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame^]	2287	<td>psd:additional-info=all\|selective</td>
				2288	<td>This option should only be used when converting from a PSD file to another PSD file. This should be placed after the image is read. The two options are 'all' and 'selective'. The 'selective' option will preserve all additional information that is not related to the geometry of the image. The 'all' option should only be used when the geometry of the image has not been changed. This option is helpful when transferring non-simple layers, such as adjustment layers from the input PSD file to the output PSD file. If this option is not used, the additional information will not be preserved. This define is available as of Imagemagick version 6.9.5-8.
				2289	</td>
				2290	</tr>
				2291
				2292	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2293	<td>psd:alpha-unblend=off</td>
				2294	<td>Disables new automatic un-blending of transparency with the base image
				2295	for the flattened layer 0 before adding the alpha channel to the output
				2296	image. This define must be placed before the input psd image. (Available
				2297	as of IM 6.9.2.5). The automatic un-blending is new to IM 6.9.2.5 and
				2298	prevents the transparency from being applied twice in the output
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame^]	2299	image. This option should be set before reading the image.</td>
				2300	</tr>
				2301
				2302	<tr>
				2303	<td>psd:preserve-opacity-mask=true</td>
				2304	<td>This option should only be used when converting from a PSD file to another PSD file. It will preserve the opacity mask of a layer and add it back to the layer when the image is saved. Setting this to 'true' will enable this feature. This define is available as of Imagemagick version 6.9.5-10.
				2305	</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2306	</tr>
				2307
				2308	<tr>
Cristy	1f1f3a0	2016-06-01 07:25:42 -0400	[diff] [blame]	2309	<td>preserve-timestamp=<var>{True, False}</var></td>
				2310	<td>Preserve file timestamp (<code>mogrify</code> only).</td>
				2311	</tr>
				2312
				2313	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2314	<td>quantum:format=<var>type</var></td>
				2315	<td>Set the type to <code>floating-point</code> to specify a floating-point
				2316	format for raw files (e.g. GRAY:) or for MIFF and TIFF images in HDRI mode
				2317	to preserve negative values. If <a href="command-line-options.html#depth">-depth</a> 16 is
				2318	included, the result is a single precision floating point format.
				2319	If <a href="command-line-options.html#depth">-depth</a> 32 is included, the result is
				2320	double precision floating point format.</td>
				2321	</tr>
				2322
				2323	<tr>
				2324	<td>quantum:polarity=<var>photometric-interpretation</var></td>
				2325	<td>Set the photometric-interpretation of an image (typically for TIFF image
				2326	file format) to either <code>min-is-black</code> (default) or
				2327	<code>min-is-white</code>.</td>
				2328	</tr>
				2329
				2330	<tr>
				2331	<td>sample:offset=<var>geometry</var></td>
				2332	<td>Location of the sampling point within the sub-region being sampled,
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2333	expressed as percentages (see <a href="command-line-options.html#sample" >-sample</a>).</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2334	</tr>
				2335
				2336	<tr>
				2337	<td>showkernel=<var>1</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2338	<td>Outputs (to 'standard error') all the information about a generated <a
				2339	href="command-line-options.html#morphology" >-morphology</a> kernel.</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2340	</tr>
				2341
				2342	<tr>
				2343	<td>stream:buffer-size=<var>value</var></td>
				2344	<td>Set the stream buffer size. Select 0 for unbuffered I/O.</td>
				2345	</tr>
				2346
				2347	<tr>
				2348	<td>tiff:alpha=<var>associated\|unassociated\|unspecified</var></td>
				2349	<td>Specify the alpha extra samples as associated, unassociated or unspecified </td>
				2350	</tr>
				2351
				2352	<tr>
				2353	<td>tiff:endian=<var>msb\|lsb</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2354	<td>&nbsp</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2355	</tr>
				2356
				2357	<tr>
				2358	<td>tiff:exif-properties=<var>false</var></td>
				2359	<td>Skips reading the EXIF properties.</td>
				2360	</tr>
				2361
				2362	<tr>
				2363	<td>tiff:fill-order=<var>msb\|lsb</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2364	<td>&nbsp</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2365	</tr>
				2366
				2367	<tr>
				2368	<td>tiff:ignore-layers=<var>true</var></td>
				2369	<td>Ignores the photoshop layers.</td>
				2370	</tr>
				2371
				2372	<tr>
				2373	<td>tiff:ignore-tags=<var>comma-separate-list-of-tag-IDs</var></td>
				2374	<td>Allows one or more tag ID values to be ignored.</td>
				2375	</tr>
				2376
				2377	<tr>
				2378	<td>tiff:rows-per-strip=<var>value</var></td>
				2379	<td>Sets the number of rows per strip</td>
				2380	</tr>
				2381
				2382	<tr>
				2383	<td>tiff:tile-geometry=<var>WxH</var></td>
				2384	<td>Sets the tile size for pyramid tiffs. Requires the suffix
				2385	PTIF: before the outputname</td>
				2386	</tr>
Cristy	e09ed31	2016-03-06 08:07:39 -0500	[diff] [blame]	2387
				2388	<tr>
				2389	<td>type:features=<var>string</var></td>
				2390	<td>&nbsp</td>
				2391	</tr>
				2392
				2393	<tr>
				2394	<td>type:hinting=<var>off</var></td>
				2395	<td>&nbsp</td>
				2396	</tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2397	</table>
				2398
				2399	<p>For example, to create a postscript file that will render only the black
				2400	pixels of a bilevel image, use:</p>
				2401
				2402	<pre>
				2403	convert bilevel.tif -define ps:imagemask eps3:stencil.ps
				2404	</pre>
				2405
				2406	<p>Set attributes of the image registry by prefixing the value with
				2407	<code>registry:</code>. For example, to set a temporary path to put work files,
				2408	use:</p>
				2409
				2410	<pre>
				2411	-define registry:temporary-path=/data/tmp
				2412	</pre>
				2413
				2414	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2415	<h3 class="magick-header"><a id="delay"></a>-delay <var>ticks</var> <br />-delay <var>ticks</var>x<var>ticks-per-second</var> {<var><</var>} {<var>></var>}</h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2416	</div>
				2417
				2418	<p class="magick-description">display the next image after pausing.</p>
				2419
				2420	<p>This option is useful for regulating the animation of image sequences
				2421	<var>ticks/ticks-per-second</var> seconds must expire before the display of the
				2422	next image. The default is no delay between each showing of the image
				2423	sequence. The default ticks-per-second is 100.</p>
				2424
				2425	<p>Use <code>></code> to change the image delay <var>only</var> if its current
				2426	value exceeds the given delay. <code><</code> changes the image delay
				2427	<var>only</var> if current value is less than the given delay. For example, if
				2428	you specify <code>30></code> and the image delay is 20, the image delay does
				2429	not change. However, if the image delay is 40 or 50, the delay it is changed
				2430	to 30. Enclose the given delay in quotation marks to prevent the
				2431	<code><</code> or <code>></code> from being interpreted by your shell as
				2432	a file redirection.</p>
				2433
				2434
				2435	<div style="margin: auto;">
				2436	<h3 class="magick-header"><a id="delete"></a>-delete <var>indexes</var></h3>
				2437	</div>
				2438
				2439	<p class="magick-description">delete the images specified by index, from the image sequence.</p>
				2440
				2441	<p>Specify the image by its index in the sequence. The first image is index
				2442	0. Negative indexes are relative to the end of the sequence, for example, -1
				2443	represents the last image of the sequence. Specify a range of images with
				2444	a dash (e.g. 0-4). Separate indexes with a comma (e.g. 0,2). Use
Cristy	912a922	2016-06-17 15:37:28 -0400	[diff] [blame]	2445	<code>+delete</code> to delete the last image in the current image sequence. Use <code>-delete 0--1</code> to delete the entire image sequence.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2446
				2447
				2448	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2449	<h3 class="magick-header"><a id="density"></a>-density <var>width</var><br />-density <var>width</var>x<var>height</var></h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2450	</div>
				2451
				2452	<p class="magick-description">Set the horizontal and vertical resolution of an image for rendering to devices.</p>
				2453
				2454	<p>This option specifies the image resolution to store while encoding a raster
				2455	image or the canvas resolution while rendering (reading) vector formats such
				2456	as Postscript, PDF, WMF, and SVG into a raster image. Image resolution
				2457	provides the unit of measure to apply when rendering to an output device or
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2458	raster image. The default unit of measure is in dots per inch (DPI). The <a
				2459	href="command-line-options.html#units">-units</a> option may be used to select dots per centimeter
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2460	instead.</p>
				2461
				2462	<p>The default resolution is 72 dots per inch, which is equivalent to one
				2463	point per pixel (Macintosh and Postscript standard). Computer screens are
				2464	normally 72 or 96 dots per inch, while printers typically support 150, 300,
				2465	600, or 1200 dots per inch. To determine the resolution of your display, use
				2466	a ruler to measure the width of your screen in inches, and divide by the
				2467	number of horizontal pixels (1024 on a 1024x768 display).</p>
				2468
				2469	<p>If the file format supports it, this option may be used to update the
				2470	stored image resolution. Note that Photoshop stores and obtains image
				2471	resolution from a proprietary embedded profile. If this profile is not
				2472	stripped from the image, then Photoshop will continue to treat the image using
				2473	its former resolution, ignoring the image resolution specified in the standard
				2474	file header.</p>
				2475
				2476	<p>The <a href="command-line-options.html#density">-density</a> option sets an <var>attribute</var> and
				2477	does not alter the underlying raster image. It may be used to adjust the
				2478	rendered size for desktop publishing purposes by adjusting the scale applied
				2479	to the pixels. To resize the image so that it is the same size at a different
				2480	resolution, use the <a href="command-line-options.html#resample">-resample</a> option.</p>
				2481
				2482	<div style="margin: auto;">
				2483	<h3 class="magick-header"><a id="depth"></a>-depth <var>value</var></h3>
				2484	</div>
				2485
				2486	<p class="magick-description">depth of the image.</p>
				2487
				2488	<p>This the number of bits in a color sample within a pixel. Use this option
				2489	to specify the depth of raw images whose depth is unknown such as GRAY, RGB,
				2490	or CMYK, or to change the depth of any image after it has been read.</p>
				2491
				2492	<div style="margin: auto;">
				2493	<h3 class="magick-header"><a id="descend"></a>-descend</h3>
				2494	</div>
				2495
				2496	<p class="magick-description">obtain image by descending window hierarchy.</p>
				2497
				2498	<div style="margin: auto;">
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	2499	<h3 class="magick-header"><a id="deskew"></a>-deskew <var>threshold{%}</var></h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2500	</div>
				2501
				2502	<p class="magick-description">straighten an image. A threshold of 40% works for most images.</p>
				2503
				2504	<p>Use <a href="command-line-options.html#set">-set</a> <code>option:deskew:auto-crop
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame^]	2505	<var>true \| false</var></code> to auto crop the image.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2506
				2507	<div style="margin: auto;">
				2508	<h3 class="magick-header"><a id="despeckle"></a>-despeckle</h3>
				2509	</div>
				2510
				2511	<p class="magick-description">reduce the speckles within an image.</p>
				2512
				2513	<div style="margin: auto;">
				2514	<h3 class="magick-header"><a id="direction"></a>-direction <var>type</var></h3>
				2515	</div>
				2516
				2517	<p class="magick-description">render text right-to-left or left-to-right.</p>
				2518
				2519	<div style="margin: auto;">
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	2520	<h3 class="magick-header"><a id="displace"></a>-displace <var>horizontal-scale</var>{%}{!}<br />-displace <var>horizontal-scale</var>x<var>vertical-scale</var>{%}{!}</h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2521	</div>
				2522
				2523	<p class="magick-description">shift image pixels as defined by a displacement map.</p>
				2524
				2525	<p>With this option, the 'overlay' image, and optionally the 'mask' image,
				2526	is used as a displacement map, which is used to displace the lookup of
				2527	what part of the 'background' image is seen at each point of the overlaid
				2528	area. Much like the displacement map is a 'lens' that redirects light shining
				2529	through it so as to present a distorted view the original 'background' image
				2530	behind it. </p>
				2531
				2532	<p>Any perfect grey areas of the displacement map produce a zero
				2533	displacement of the image. Black areas produce the given maximum negative
				2534	displacement of the lookup point, while white produce a maximum positive
				2535	displacement of the lookup. </p>
				2536
				2537	<p>Note that it is the lookup of the 'background' that is displaced, not a
				2538	displacement of the image itself. As such an area of the displacement map
				2539	containing 'white' will have the lookup point 'shifted' by a positive amount,
				2540	and thus generating a copy of the destination image to the right/downward from
				2541	the correct position. That is the image will look like it may have been
				2542	'shifted' in a negative left/upward direction. Understanding this is a very
				2543	important in understanding how displacement maps work. </p>
				2544
				2545	<p>The given arguments define the maximum amount of displacement in pixels
				2546	that a particular map can produce. If the displacement scale is large enough
				2547	it is also possible to lookup parts of the 'background' image that lie well
				2548	outside the bounds of the displacement map itself. That is you could very
				2549	easily copy a section of the original image from outside the overlay area
				2550	into the overlay area. </p>
				2551
				2552	<p>The '%' flag makes the displacement scale relative to the size of the
				2553	overlay image (100% = half width/height of image). Using '!' switches
				2554	percentage arguments to refer to the destination image size instead.
				2555	these flags were added as of IM v6.5.3-5.</p>
				2556
				2557	<p>Normally a single grayscale displacement map is provided, which with the
				2558	given scaling values will determine a single direction (vector) in which
				2559	displacements can occur (positively or negatively). However, if you also
				2560	specify a third image which is normally used as a <var>mask</var>,
				2561	the <var>composite image</var> is used for horizontal X
				2562	displacement, while the <var>mask image</var> is used for vertical Y
				2563	displacement. This allows you to define completely different displacement
				2564	values for the X and Y directions, and allowing you to lookup any point within
				2565	the <var>scale</var> bounds. In other words each pixel can lookup
				2566	any other nearby pixel, producing complex 2 dimensional displacements, rather
				2567	than a simple 1 dimensional vector displacements. </p>
				2568
				2569	<p>Alternatively rather than supplying two separate images, as of IM v6.4.4-0,
				2570	you can use the 'red' channel of the overlay image to specify the horizontal
				2571	or X displacement, and the 'green' channel for the vertical or Y displacement.
				2572	</p>
				2573
				2574	<p>As of IM v6.5.3-5 any alpha channel in the overlay image is used as a
				2575	mask the transparency of the destination image. However areas outside the
				2576	overlaid areas will not be effected. </p>
				2577
				2578
				2579	<div style="margin: auto;">
				2580	<h3 class="magick-header"><a id="display"></a>-display <var>host:display[.screen]</var></h3>
				2581	</div>
				2582
				2583	<p class="magick-description">Specifies the X server to contact.</p>
				2584
				2585	<p>This option is used with convert for obtaining image or font from this
				2586	X server. See <var>X(1)</var>.</p>
				2587
				2588	<div style="margin: auto;">
				2589	<h3 class="magick-header"><a id="dispose"></a>-dispose <var>method</var></h3>
				2590	</div>
				2591
				2592	<p class="magick-description">define the GIF disposal image setting for images that are being created or read in. </p>
				2593
				2594	<p>The layer disposal method defines the way each the displayed image is to be
				2595	modified after the current 'frame' of an animation has finished being
				2596	displayed (after its 'delay' period), but before the next frame on an
				2597	animation is to be overlaid onto the display. </p>
				2598
				2599	<p>Here are the valid methods:</p>
				2600
				2601	<dl class="dl-horizontal">
				2602	<dt>Undefined</dt><dd>0: No disposal specified (equivalent to '<code>none</code>').</dd>
				2603	<dt>None</dt><dd>1: Do not dispose, just overlay next frame image.</dd>
				2604	<dt>Background</dt><dd>2: Clear the frame area with the background color.</dd>
				2605	<dt>Previous</dt><dd>3: Clear to the image prior to this frames overlay.</dd>
				2606	</dl>
				2607
				2608	<p>You can also use the numbers given above, which is what the GIF format
				2609	uses internally to represent the above settings. </p>
				2610
				2611	<p>To print a complete list of dispose methods, use <a href="command-line-options.html#list">-list dispose</a>.</p>
				2612
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2613	<p>Use <a href="command-line-options.html#dispose" >+dispose</a>, turn off the setting and prevent
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2614	resetting the layer disposal methods of images being read in. </p>
				2615
				2616	<p>Use <a href="command-line-options.html#set">-set</a> '<code>dispose</code>' method to set the image
				2617	disposal method for images already in memory.</p>
				2618
				2619	<div style="margin: auto;">
				2620	<h3 class="magick-header"><a id="dissimilarity-threshold"></a>-dissimilarity-threshold <var>value</var></h3>
				2621	</div>
				2622
				2623	<p class="magick-description">maximum RMSE for subimage match (default 0.2).</p>
				2624
				2625
				2626	<div style="margin: auto;">
				2627	<h3 class="magick-header"><a id="dissolve"></a>-dissolve <var>src_percent</var>[x<var>dst_percent</var>]</h3>
				2628	</div>
				2629
				2630	<p class="magick-description">dissolve an image into another by the given percent.</p>
				2631
				2632	<p>The opacity of the composite image is multiplied by the given percent, then
				2633	it is composited 'over' the main image. If <var>src_percent</var>
				2634	is greater than 100, start dissolving the main image so it becomes
				2635	transparent at a value of '<code>200</code>'. If both percentages
				2636	are given, each image are dissolved to the percentages given. </p>
				2637
				2638	<p>Note that dissolve percentages do not add, two opaque images dissolved
				2639	'50,50', produce a 75% transparency. For a 50% + 50% blending of the two
				2640	images, you would need to use dissolve values of '50,100'. </p>
				2641
				2642	<div style="margin: auto;">
				2643	<h3 class="magick-header"><a id="distort"></a>-distort <var>method arguments</var></h3>
				2644	</div>
				2645
				2646	<p class="magick-description">distort an image, using the given <var>method</var> and its required <var>arguments</var>.</p>
				2647
				2648	<p>The <var>arguments</var> is a single string containing a list
				2649	of floating point numbers separated by commas or spaces. The number of
				2650	and meaning of the floating point values depends on the distortion <var>method</var> being used. </p>
				2651
				2652	<p>Choose from these distortion types:</p>
				2653
				2654	<table class="table table-condensed table-striped">
				2655	<tr>
				2656	<th style="width: 8%">Method</th>
				2657	<th>Description</th>
				2658	</tr>
				2659
				2660	<tr>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2661	<td>ScaleRotateTranslate <br/> SRT</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2662	<td>
				2663	Distort image by first scaling and rotating about a given 'center',
				2664	before translating that 'center' to the new location, in that order. It
				2665	is an alternative method of specifying a 'Affine' type of
				2666	distortion, but without shearing effects. It also provides a good way
				2667	of rotating and displacing a smaller image for tiling onto a larger
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2668	background (IE 2-dimensional animations). <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2669
				2670	The number of arguments determine the specific meaning of each
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2671	argument for the scales, rotation, and translation operations. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2672
				2673	<dl class="dl-horizontal">
				2674	<dt>2:</dt><dd><var>Scale Angle</var></dd>
				2675	<dt>3:</dt><dd><var>X,Y Angle</var></dd>
				2676	<dt>4:</dt><dd><var>X,Y Scale Angle</var></dd>
				2677	<dt>5:</dt> <dd><var>X,Y ScaleX,ScaleY Angle</var></dd>
				2678	<dt>6:</dt> <dd><var>X,Y Scale Angle NewX,NewY</var></dd>
				2679	<dt>7:</dt> <dd><var>X,Y ScaleX,ScaleY Angle NewX,NewY</var></dd>
				2680	</dl>
				2681
				2682	This is actually an alternative way of specifying a 2 dimensional linear
				2683	'Affine' or 'AffineProjection' distortion. </td> </tr>
				2684
				2685	<tr>
				2686	<td>Affine</td>
				2687	<td>
				2688	Distort the image linearly by moving a list of at least 3 or more sets
				2689	of control points (as defined below). Ideally 3 sets or 12 floating
				2690	point values are given allowing the image to be linearly scaled,
				2691	rotated, sheared, and translated, according to those three points. See
				2692	also the related 'AffineProjection' and 'SRT'
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2693	distortions. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2694
				2695	More than 3 sets given control point pairs (12 numbers) is least
				2696	squares fitted to best match a linear affine distortion. If only 2
				2697	control point pairs (8 numbers) are given a two point image translation
				2698	rotation and scaling is performed, without any possible shearing,
				2699	flipping or changes in aspect ratio to the resulting image. If only one
				2700	control point pair is provides the image is only translated, (which may
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2701	be a floating point non-integer translation). <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2702
				2703	This distortion does not include any form of perspective distortion.
				2704	</td>
				2705
				2706	</tr>
				2707
				2708	<tr>
				2709	<td>AffineProjection</td>
				2710	<td>
				2711	Linearly distort an image using the given Affine Matrix of 6
				2712	pre-calculated coefficients forming a set of Affine Equations to map
				2713	the source image to the destination image.
				2714
				2715	<p class="text-center"><var>
				2716	s<sub>x</sub>, r<sub>x</sub>,
				2717	r<sub>y</sub>, s<sub>y</sub>,
				2718	t<sub>x</sub>, t<sub>y</sub>
				2719	</var></p>
				2720
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2721	See <a href="command-line-options.html#affine" >-affine</a> setting for more detail, and
				2722	meanings of these coefficients. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2723
				2724	The distortions 'Affine' and 'SRT' provide
				2725	alternative methods of defining this distortion, with ImageMagick doing
				2726	the calculations needed to generate the required coefficients. You can
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2727	see the internally generated coefficients, by using a <a
				2728	href="command-line-options.html#verbose" >-verbose</a> setting with those other variants. </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2729
				2730	</tr>
				2731
				2732	<tr>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2733	<td>BilinearForward<br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2734	BilinearReverse</td>
				2735	<td>
				2736	Bilinear Distortion, given a minimum of 4 sets of coordinate pairs, or
				2737	16 values (see below). Not that lines may not appear straight after
				2738	distortion, though the distance between coordinates will remain
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2739	consistent. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2740
				2741	The 'BilinearForward' is used to map rectangles to any
				2742	quadrilateral, while the 'BilinearReverse' form maps any
				2743	quadrilateral to a rectangle, while preserving the straight line edges
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2744	in each case. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2745
				2746	Note that 'BilinearForward' can generate invalid pixels
Cristy	f650f4f	2016-04-01 10:53:07 -0400	[diff] [blame]	2747	which will be colored using the <a href="command-line-options.html#alpha-color" >-alpha-color</a>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2748	color setting. Also if the quadrilateral becomes 'flipped' the image
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2749	may disappear. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2750
				2751	There are future plans to produce a true Bilinear distortion that will
				2752	attempt to map any quadrilateral to any other quadrilateral, while
				2753	preserving edges (and edge distance ratios).
				2754
				2755	</td>
				2756	</tr>
				2757
				2758	<tr>
				2759	<td>Perspective</td>
				2760	<td>
				2761	Perspective distort the images, using a list of 4 or more sets of
				2762	control points (as defined below). More that 4 sets (16 numbers) of
				2763	control points provide least squares fitting for more accurate
				2764	distortions (for the purposes of image registration and panorama
				2765	effects). Less than 4 sets will fall back to a 'Affine'
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2766	linear distortion. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2767
				2768	Perspective Distorted images ensures that straight lines remain
				2769	straight, but the scale of the distorted image will vary. The horizon
				2770	is anti-aliased, and the 'sky' color may be set using the
Cristy	f650f4f	2016-04-01 10:53:07 -0400	[diff] [blame]	2771	<a href="command-line-options.html#alpha-color" >-alpha-color</a> setting. </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2772	</tr>
				2773
				2774	<tr>
				2775	<td>PerspectiveProjection </td>
				2776	<td>
				2777	Do a 'Perspective' distortion biased on a set of 8
				2778	pre-calculated coefficients. You can get these coefficients by looking
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2779	at the <a href="command-line-options.html#verbose" >-verbose</a> output of a
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2780	'Perspective' distortion, or by calculating them yourself.
				2781	If the last two perspective scaling coefficients are zero, the
				2782	remaining 6 represents a transposed 'Affine Matrix'. </td>
				2783
				2784	</tr>
				2785
				2786	<tr>
				2787	<td>Arc</td>
				2788	<td>
				2789	Arc the image (variation of polar mapping) over the angle given around
				2790	a circle.
				2791
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2792	<p><dl class="dl-horizontal">
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2793	<dt>arc_angle</dt>
				2794	<dd>The angle over which to arc the image side-to-side</dd>
				2795	<dt>rotate_angle</dt>
				2796	<dd>Angle to rotate resulting image from vertical center</dd>
				2797	<dt>top_radius</dt>
				2798	<dd>Set top edge of source image at this radius</dd>
				2799	<dt>bottom_radius </dt>
				2800	<dd>Set bottom edge to this radius (radial scaling)</dd>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2801	</dl></p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2802
				2803	The resulting image is always resized to best fit the resulting image,
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2804	(as if using <a href="command-line-options.html#distort" >+distort</a>) while attempting to
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2805	preserve scale and aspect ratio of the original image as much as
				2806	possible with the arguments given by the user. All four arguments will
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2807	be needed to change the overall aspect ratio of an 'Arc'ed image. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2808
				2809	This a variation of a polar distortion designed to try to preserve the
				2810	aspect ratio of the image rather than direct Cartesian to Polar
				2811	conversion. </td>
				2812	</tr>
				2813
				2814	<tr>
				2815	<td>Polar</td>
				2816	<td>
				2817	Like 'Arc' but do a complete Cartesian to Polar mapping of
				2818	the image. that is the height of the input image is mapped to the
				2819	radius limits, while the width is wrapped around between the
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2820	angle limits. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2821
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2822	Arguments: <var>Rmax,Rmin CenterX,CenterY, start,end_angle</var> <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2823
				2824	All arguments are optional. With <var>Rmin</var> defaulting to zero, the
				2825	center to the center of the image, and the angles going from -180 (top)
				2826	to +180 (top). If <var>Rmax</var> is given the special value of
				2827	'0', the the distance from the center to the nearest edge
				2828	is used for the radius of the output image, which will ensure the whole
				2829	image is visible (though scaled smaller). However a special value of
				2830	'-1' will use the distance from the center to the furthest
				2831	corner, This may 'clip' the corners from the input rectangular image,
				2832	but will generate the exact reverse of a 'DePolar' with
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2833	the same arguments. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2834
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2835	If the plus form of distort (<a href="command-line-options.html#distort" >+distort</a>) is used
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2836	output image center will default to 0,0 of the virtual
				2837	canvas, and the image size adjusted to ensure the whole input image is
				2838	made visible in the output image on the virtual canvas. </td>
				2839
				2840	</tr>
				2841
				2842	<tr>
				2843	<td>DePolar</td>
				2844	<td>
				2845	Uses the same arguments and meanings as a 'Polar' distortion
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2846	but generates the reverse Polar to Cartesian distortion. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2847
				2848	The special <var>Rmax</var> setting of '0' may however clip
				2849	the corners of the input image. However using the special
				2850	<var>Rmax</var> setting of '-1' (maximum center to corner
				2851	distance) will ensure the whole distorted image is preserved in the
				2852	generated result, so that the same argument to 'Polar' will
				2853	reverse the distortion re-producing the original.
				2854
				2855	Note that as this distortion requires the area resampling of a circular
				2856	arc, which can not be handled by the builtin EWA resampling function.
				2857	As such the normal EWA filters are turned off. It is recommended some
				2858	form of 'super-sampling' image processing technique be used to produce
				2859	a high quality result. </td>
				2860
				2861	</tr>
				2862
				2863	<tr>
				2864	<td>Barrel</td>
				2865	<td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2866	Given the four coefficients (A,B,C,D) as defined by <a
				2867	href="http://wiki.panotools.org/Lens_correction_model" >Helmut
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2868	Dersch</a>, perform a barrel or pin-cushion distortion appropriate to
				2869	correct radial lens distortions. That is in photographs, make straight
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2870	lines straight again. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2871
				2872	<p class="text-center">Arguments: <var>A B C</var> [ <var>D</var> [
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2873	<var>X</var> , <var>Y</var> ] ] <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2874	or <var>A<sub>x</sub> B<sub>x</sub> C<sub>x</sub> D<sub>x</sub>
				2875	A<sub>y</sub> B<sub>y</sub> C<sub>y</sub> D<sub>y</sub></var>
				2876	[ <var>X</var> , <var>Y</var> ] </p>
				2877	So that it forms the function
				2878	<p class="text-center">Rsrc = r * ( <var>A</var>r<sup>3</sup> + <var>B</var>r<sup>2</sup> +
				2879	<var>C</var>*r + <var>D</var> )</p>
				2880
				2881	Where <var>X</var>,<var>Y</var> is the optional center of the distortion
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2882	(defaulting to the center of the image). <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2883	The second form is typically used to distort images, rather than
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2884	correct lens distortions. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2885	</td>
				2886
				2887	</tr>
				2888
				2889	<tr>
				2890	<td>BarrelInverse</td>
				2891	<td>
				2892	This is very similar to 'Barrel' with the same set of
				2893	arguments, and argument handling. However it uses the inverse
				2894	of the radial polynomial,
				2895	so that it forms the function
				2896	<p class="text-center">Rsrc = r / ( <var>A</var>r<sup>3</sup> + <var>B</var>r<sup>2</sup> +
				2897	<var>C</var>*r + <var>D</var> )</p>
				2898	Note that this is not the reverse of the 'Barrel'
				2899	distortion, just a different barrel-like radial distortion method.
				2900
				2901	</td>
				2902	</tr>
				2903
				2904	<tr>
				2905	<td>Shepards</td>
				2906	<td>
				2907	Distort the given list control points (any number) using an Inverse
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2908	Squared Distance Interpolation Method (<a
				2909	href="http://en.wikipedia.org/wiki/Shepard%27s_method" >Shepards
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2910	Method</a>). The control points in effect do 'localized' displacement
				2911	of the image around the given control point (preserving the look and
				2912	the rotation of the area near the control points. For best results
				2913	extra control points should be added to 'lock' the positions of the
				2914	corners, edges and other unchanging parts of the image, to prevent
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2915	their movement. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2916
				2917	The distortion has been likened to 'taffy pulling' using nails, or
				2918	pins' stuck in a block of 'jelly' which is then moved to the new
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2919	position, distorting the surface of the jelly. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2920
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2921	Internally it is equivalent to generating a displacement map (see <a
				2922	href="command-line-options.html#displace" >-displace</a>) for source image color look-up using
				2923	the <a href="command-line-options.html#sparse-color" >-sparse-color</a> method of the same name.
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2924
				2925	</td>
				2926	</tr>
				2927
				2928	</table>
				2929
				2930	<p>To print a complete list of distortion methods, use <a href="command-line-options.html#list">-list
				2931	distort</a>.</p>
				2932
				2933	<p>Many of the above distortion methods such as '<code>Affine</code>',
				2934	'<code>Perspective</code>', and '<code>Shepards</code>' use a list control points
				2935	defining how these points in the given image should be distorted in the
				2936	destination image. Each set of four floating point values represent a source
				2937	image coordinate, followed immediately by the destination image coordinate.
				2938	This produces a list of values such as...</p>
				2939	<p class="text-center"><var>
				2940	U<sub>1</sub>,V<sub>1</sub> X<sub>1</sub>,Y<sub>1</sub>
				2941	U<sub>2</sub>,V<sub>2</sub> X<sub>2</sub>,Y<sub>2</sub>
				2942	U<sub>3</sub>,V<sub>3</sub> X<sub>3</sub>,Y<sub>3</sub>
				2943	...
				2944	U<sub>n</sub>,V<sub>n</sub> X<sub>n</sub>,Y<sub>n</sub>
				2945	</var></p>
				2946	<p>where <var>U,V</var> on the source image is mapped to <var>X,Y</var> on the
				2947	destination image. </p>
				2948
				2949	<p>For example, to warp an image using '<code>perspective</code>' distortion,
				2950	needs a list of at least 4 sets of coordinates, or 16 numbers. Here is the
				2951	perspective distortion of the built-in "rose:" image. Note how spaces were
				2952	used to group the 4 sets of coordinate pairs, to make it easier to read and
				2953	understand.</p>
				2954
				2955	<pre>
				2956	convert rose: -virtual-pixel black \
				2957	-distort Perspective '0,0,0,0 0,45,0,45 69,0,60,10 69,45,60,35' \
				2958	rose_3d_rotated.gif"
				2959	</pre>
				2960
				2961	<p>If more that the required number of coordinate pairs are given for
				2962	a distortion, the distortion method is 'least squares' fitted to produce the
				2963	best result for all the coordinate pairs given. If less than the ideal number
				2964	of points are given, the distort will generally fall back to a simpler form of
				2965	distortion that can handles the smaller number of coordinates (usually a linear
				2966	'<code>Affine</code>' distortion). </p>
				2967
				2968	<p>By using more coordinates you can make use of image registration tool to
				2969	find matching coordinate pairs in overlapping images, so as to improve the
				2970	'fit' of the distortion. Of course a bad coordinate pair can also make the
				2971	'fit' worse. Caution is always advised. </p>
				2972
				2973	<p>Colors are acquired from the source image according to a cylindrical
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2974	resampling <a href="command-line-options.html#filter" >-filter</a>, using a special technique known as
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2975	EWA resampling. This produces very high quality results, especially when
				2976	images become smaller (minified) in the output, which is very common when
				2977	using '<code>perspective</code>' distortion. For example here we view
				2978	a infinitely tiled 'plane' all the way to the horizon. </p>
				2979
				2980	<pre>
				2981	convert -size 90x90 pattern:checkerboard -normalize -virtual-pixel tile \
				2982	-distort perspective '0,0,5,45 89,0,45,46 0,89,0,89 89,89,89,89' \
				2983	checks_tiled.jpg
				2984	</pre>
				2985
				2986	<p>Note that a infinitely tiled perspective images involving the horizon can
				2987	be very slow, because of the number of pixels that are compressed to generate
				2988	each individual pixel close to the 'horizon'. You can turn off EWA
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2989	resampling, by specifying the special <a href="command-line-options.html#filter" >-filter</a> setting of
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2990	'<code>point</code>' (recommended if you plan to use super-sampling instead).
				2991	</p>
				2992
				2993	<p>If an image generates <i>invalid pixels</i>, such as the 'sky' in the last
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2994	example, <a href="command-line-options.html#distort" >-distort</a> will use the current <a
Cristy	f650f4f	2016-04-01 10:53:07 -0400	[diff] [blame]	2995	href="command-line-options.html#alpha-color" >-alpha-color</a> setting for these pixels. If you do not
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2996	what these pixels to be visible, set the color to match the rest of the
				2997	ground. </p>
				2998
				2999	<p>The output image size will by default be the same as the input image. This
				3000	means that if the part of the distorted image falls outside the viewed area of
				3001	the 'distorted space', those parts is clipped and lost. However if you use
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3002	the plus form of the operator (<a href="command-line-options.html#distort" >+distort</a>) the operator
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3003	will attempt (if possible) to show the whole of the distorted image, while
				3004	retaining a correct 'virtual canvas' offset, for image layering. This offset
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3005	may need to be removed using <a href="command-line-options.html#repage" >+repage</a>, to remove if it
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3006	is unwanted. </p>
				3007
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3008	<p>Setting <a href="command-line-options.html#verbose" >-verbose</a> setting, will cause <a
				3009	href="command-line-options.html#distort" >-distort</a> to attempt to output the internal coefficients,
				3010	and the <a href="command-line-options.html#fx" >-fx</a> equivalent to the distortion, for expert study,
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3011	and debugging purposes. This many not be available for all distorts. </p>
				3012
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3013	<p>You can alternatively specify a special "<code><a href="command-line-options.html#define"
				3014	>-define</a> distort:viewport={geometry_string}</code>" setting which will
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3015	specify the size and the offset of the generated 'viewport' image of the
				3016	distorted image space.</p>
				3017
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3018	<p>Setting a "<code><a href="command-line-options.html#define" >-define</a>
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	3019	distort:scale=<var>scale_factor</var></code>" will scale the output image (viewport or
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3020	otherwise) by that factor without changing the viewed contents of the
				3021	distorted image. This can be used either for 'super-sampling' the image for
				3022	a higher quality result, or for panning and zooming around the image (with
				3023	appropriate viewport changes, or post-distort cropping and resizing). </p>
				3024
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3025	<p>Setting "<code><a href="command-line-options.html#define" >-define</a> resample:verbose=1</code>"
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3026	will output the cylindrical filter lookup table created by the EWA (Elliptical
				3027	Weighted Average) resampling algorithm. Note this table uses a squared radius
				3028	lookup value. This is typically only used for debugging EWA resampling. </p>
				3029
				3030
				3031	<div style="margin: auto;">
				3032	<h3 class="magick-header"><a id="distribute-cache"></a>-distribute-cache <var>port</var></h3>
				3033	</div>
				3034
				3035	<p class="magick-description">launch a distributed pixel cache server. </p>
				3036
				3037	<div style="margin: auto;">
				3038	<h3 class="magick-header"><a id="dither"></a>-dither <var>method</var></h3>
				3039	</div>
				3040
				3041	<p class="magick-description">Apply a Riemersma or Floyd-Steinberg error diffusion dither to
				3042	images when general color reduction is applied via an option, or automagically
				3043	when saving to specific formats. This enabled by default.</p>
				3044
				3045	<p>Dithering places two or more colors in neighboring pixels so that to the
				3046	eye a closer approximation of the images original color is reproduced. This
				3047	reduces the number of colors needed to reproduce the image but at the cost of
				3048	a lower level pattern of colors. Error diffusion dithers can use any set of
				3049	colors (generated or user defined) to an image. </p>
				3050
				3051	<p>Dithering is turned on by default, to turn it off use the plus form of the
				3052	setting, <a href="command-line-options.html#dither">+dither</a>. This will also also render PostScript
				3053	without text or graphic aliasing. Disabling dithering often (but not always)
				3054	leads to faster process, a smaller number of colors, but more cartoon like
				3055	image coloring. Generally resulting in 'color banding' effects in areas with
				3056	color gradients. </p>
				3057
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3058	<p>The color reduction operators <a href="command-line-options.html#colors">-colors</a>, <a
				3059	href="command-line-options.html#monochrome">-monochrome</a>, <a href="command-line-options.html#remap ">-remap</a>, and <a
				3060	href="command-line-options.html#posterize">-posterize</a>, apply dithering to images using the reduced
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3061	color set they created. These operators are also used as part of automatic
				3062	color reduction when saving images to formats with limited color support, such
				3063	as <code>GIF:</code>, <code>XBM:</code>, and others, so dithering may also be used
				3064	in these cases. </p>
				3065
				3066	<p>Alternatively you can use <a href="command-line-options.html#random-threshold">-random-threshold</a>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3067	to generate purely random dither. Or use <a
				3068	href="command-line-options.html#ordered-dither">-ordered-dither</a> to apply threshold mapped dither
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3069	patterns, using uniform color maps, rather than specific color maps. </p>
				3070
				3071
				3072	<div style="margin: auto;">
				3073	<h3 class="magick-header"><a id="draw"></a>-draw <var>string</var></h3>
				3074	</div>
				3075
				3076	<p class="magick-description">Annotate an image with one or more graphic primitives.</p>
				3077
				3078	<p>Use this option to annotate or decorate an image with one or more graphic
				3079	primitives. The primitives include shapes, text, transformations, and pixel
				3080	operations.</p>
				3081
				3082	<p>The shape primitives:</p>
				3083
				3084	<dl class="dl-horizontal">
				3085	<dt>point</dt><dd> x,y</dd>
				3086	<dt>line</dt><dd> x0,y0 x1,y1</dd>
				3087	<dt>rectangle</dt><dd> x0,y0 x1,y1</dd>
				3088	<dt>roundRectangle</dt><dd> x0,y0 x1,y1 wc,hc</dd>
				3089	<dt>arc</dt><dd> x0,y0 x1,y1 a0,a1</dd>
				3090	<dt>ellipse</dt><dd> x0,y0 rx,ry a0,a1</dd>
				3091	<dt>circle</dt><dd> x0,y0 x1,y1</dd>
				3092	<dt>polyline</dt><dd> x0,y0 ... xn,yn</dd>
				3093	<dt>polygon</dt><dd> x0,y0 ... xn,yn</dd>
				3094	<dt>bezier</dt><dd> x0,y0 ... xn,yn</dd>
				3095	<dt>path</dt><dd>specification </dd>
				3096	<dt>image</dt><dd> operator x0,y0 w,h filename</dd>
				3097	</dl>
				3098
				3099	<p>The text primitive:</p>
				3100
				3101	<dl class="dl-horizontal">
				3102	<dt>text</dt><dd>x0,y0 string</dd>
				3103	</dl>
				3104	<p>The text gravity primitive:</p>
				3105
				3106	<dl class="dl-horizontal">
				3107	<dt>gravity</dt><dd>NorthWest, North, NorthEast, West, Center, East, SouthWest, South, or SouthEast</dd>
				3108	</dl>
				3109
				3110	<p>The text gravity primitive only affects the placement of text and does not
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3111	interact with the other primitives. It is equivalent to using the <a
				3112	href="command-line-options.html#gravity">-gravity</a> command-line option, except that it is limited in
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3113	scope to the <a href="command-line-options.html#draw">-draw</a> option in which it appears.</p>
				3114
				3115	<p>The transformation primitives:</p>
				3116
				3117	<dl class="dl-horizontal">
				3118	<dt>rotate</dt><dd>degrees</dd>
				3119	<dt>translate</dt><dd>dx,dy</dd>
				3120	<dt>scale</dt><dd>sx,sy</dd>
				3121	<dt>skewX</dt><dd>degrees</dd>
				3122	<dt>skewY</dt><dd>degrees</dd>
				3123	</dl>
				3124
				3125	<p>The pixel operation primitives:</p>
				3126
				3127	<dl class="dl-horizontal">
				3128	<dt>color</dt><dd>x0,y0 method</dd>
				3129	<dt>matte</dt><dd>x0,y0 method</dd>
				3130	</dl>
				3131
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3132	<p>The shape primitives are drawn in the color specified by the preceding <a
				3133	href="command-line-options.html#fill">-fill</a> setting. For unfilled shapes, use <a
				3134	href="command-line-options.html#fill">-fill none</a>. You can optionally control the stroke (the
				3135	"outline" of a shape) with the <a href="command-line-options.html#stroke">-stroke</a> and <a
				3136	href="command-line-options.html#strokewidth">-strokewidth</a> settings.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3137
				3138	<p>A <code>point</code> primitive is specified by a single <var>point</var> in the
				3139	pixel plane, that is, by an ordered pair of integer coordinates,
				3140	<var>x</var>,<var>y</var>. (As it involves only a single pixel, a <code>point</code>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3141	primitive is not affected by <a href="command-line-options.html#stroke">-stroke</a> or <a
				3142	href="command-line-options.html#strokewidth">-strokewidth</a>.)</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3143
				3144	<p>A <code>line</code> primitive requires a start point and end point.</p>
				3145
				3146	<p>A <code>rectangle</code> primitive is specified by the pair of points at the
				3147	upper left and lower right corners.</p>
				3148
				3149	<p>A <code>roundRectangle</code> primitive takes the same corner points as
				3150	a <code>rectangle</code> followed by the width and height of the rounded corners
				3151	to be removed.</p>
				3152
				3153	<p>The <code>circle</code> primitive makes a disk (filled) or circle (unfilled).
				3154	Give the center and any point on the perimeter (boundary).</p>
				3155
				3156	<p>The <code>arc</code> primitive is used to inscribe an elliptical segment in
				3157	to a given rectangle. An <code>arc</code> requires the two corners used for
				3158	<code>rectangle</code> (see above) followed by the start and end angles of the
				3159	arc of the segment segment (e.g. 130,30 200,100 45,90). The start and end
				3160	points produced are then joined with a line segment and the resulting segment
				3161	of an ellipse is filled.</p>
				3162
				3163	<p>Use <code>ellipse</code> to draw a partial (or whole) ellipse. Give the
				3164	center point, the horizontal and vertical "radii" (the <var>semi-axes</var> of
				3165	the ellipse) and start and end angles in degrees (e.g. 100,100 100,150
				3166	0,360).</p>
				3167
				3168	<p>The <code>polyline</code> and <code>polygon</code> primitives require three or
				3169	more points to define their perimeters. A <code>polyline</code> is simply
				3170	a <code>polygon</code> in which the final point is not stroked to the start
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3171	point. When unfilled, this is a <var>polygonal line</var>. If the <a
				3172	href="command-line-options.html#stroke">-stroke</a> setting is <code>none</code> (the default), then
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3173	a <code>polyline</code> is identical to a <code>polygon</code>. </p>
				3174
				3175	<p>A <var>coordinate</var> is a pair of integers separated by a space or
				3176	optional comma. </p>
				3177
				3178	<p>As an example, to define a circle centered at 100,100 that extends to
				3179	150,150 use:</p>
				3180
				3181	<pre>
				3182	-draw 'circle 100,100 150,150'
				3183	</pre>
				3184
				3185	<p>The <code>Bezier</code> primitive creates a spline curve and requires three
				3186	or points to define its shape. The first and last points are the
				3187	<var>knots</var> and these points are attained by the curve, while any
				3188	intermediate coordinates are <var>control points</var>. If two control points
				3189	are specified, the line between each end knot and its sequentially respective
				3190	control point determines the tangent direction of the curve at that end. If
				3191	one control point is specified, the lines from the end knots to the one
				3192	control point determines the tangent directions of the curve at each end. If
				3193	more than two control points are specified, then the additional control points
				3194	act in combination to determine the intermediate shape of the curve. In order
				3195	to draw complex curves, it is highly recommended either to use the
				3196	<code>path</code> primitive or to draw multiple four-point bezier segments with
				3197	the start and end knots of each successive segment repeated. For example:</p>
				3198
				3199	<pre>
				3200	-draw 'bezier 20,50 45,100 45,0 70,50'
				3201	-draw 'bezier 70,50 95,100 95,0 120,50'
				3202	</pre>
				3203
				3204	<p>A <code>path</code> represents an outline of an object, defined in terms of
				3205	moveto (set a new current point), lineto (draw a straight line), curveto (draw
				3206	a Bezier curve), arc (elliptical or circular arc) and closepath (close the
				3207	current shape by drawing a line to the last moveto) elements. Compound paths
				3208	(i.e., a path with subpaths, each consisting of a single moveto followed by
				3209	one or more line or curve operations) are possible to allow effects such as
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3210	<var>donut holes</var> in objects. (See <a
				3211	href="http://www.w3.org/TR/SVG/paths.html">Paths</a>.)</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3212
				3213	<p>Use <code>image</code> to composite an image with another image. Follow the
				3214	image keyword with the composite operator, image location, image size, and
				3215	filename:</p>
				3216
				3217	<pre>
				3218	-draw 'image SrcOver 100,100 225,225 image.jpg'
				3219	</pre>
				3220
				3221	<p>You can use 0,0 for the image size, which means to use the actual
				3222	dimensions found in the image header. Otherwise, it is scaled to the given
				3223	dimensions. See <a href="compose.html">Alpha Compositing</a> for
				3224	a detailed discussion of alpha composition methods that are available. </p>
				3225
				3226	<p>The "special augmented compose operators" such as "dissolve" that require
				3227	arguments cannot be used at present with the <code>-draw image</code> option.
				3228	</p>
				3229
				3230	<p>Use <code>text</code> to annotate an image with text. Follow the text
				3231	coordinates with a string. If the string has embedded spaces, enclose it in
				3232	single or double quotes.</p>
				3233
				3234	<p>For example, the following annotates the image with <code>Works like
				3235	magick!</code> for an image titled <code>bird.miff</code>. </p>
				3236
				3237	<pre>
				3238	-draw "text 100,100 'Works like magick!' "
				3239	</pre>
				3240
				3241	<p>See the <a href="command-line-options.html#annotate">-annotate</a> option for another convenient way
				3242	to annotate an image with text.</p>
				3243
				3244	<p>The <code>rotate</code> primitive rotates subsequent shape primitives and
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3245	text primitives about the origin of the main image. If the <a
				3246	href="command-line-options.html#region">-region</a> option precedes the <a href="command-line-options.html#draw">-draw</a>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3247	option, the origin for transformations is the upper left corner of the
				3248	region.</p>
				3249
				3250	<p>The <code>translate</code> primitive translates subsequent shape and text
				3251	primitives.</p>
				3252
				3253	<p>The <code>scale</code> primitive scales them.</p>
				3254
				3255	<p>The <code>skewX</code> and <code>skewY</code> primitives skew them with respect
				3256	to the origin of the main image or the region.</p>
				3257
				3258	<p>The transformations modify the current affine matrix, which is initialized
				3259	from the initial affine matrix defined by the <a href="command-line-options.html#affine">-affine</a>
				3260	option. Transformations are cumulative within the <a href="command-line-options.html#draw">-draw</a>
				3261	option. The initial affine matrix is not affected; that matrix is only changed
				3262	by the appearance of another <a href="command-line-options.html#affine">-affine</a> option. If another
				3263	<a href="command-line-options.html#draw">-draw</a> option appears, the current affine matrix is
				3264	reinitialized from the initial affine matrix.</p>
				3265
				3266	<p>Use the <code>color</code> primitive to change the color of a pixel to the
				3267	fill color (see <a href="command-line-options.html#fill">-fill</a>). Follow the pixel coordinate with
				3268	a method:</p>
				3269
				3270	<pre>
				3271	point
				3272	replace
				3273	floodfill
				3274	filltoborder
				3275	reset
				3276	</pre>
				3277
				3278	<p>Consider the target pixel as that specified by your coordinate. The
				3279	<code>point</code> method recolors the target pixel. The <code>replace</code>
				3280	method recolors any pixel that matches the color of the target pixel.
				3281	<code>Floodfill</code> recolors any pixel that matches the color of the target
				3282	pixel and is a neighbor, whereas <code>filltoborder</code> recolors any neighbor
				3283	pixel that is not the border color. Finally, <code>reset</code> recolors all
				3284	pixels.</p>
				3285
				3286	<p>Use <code>matte</code> to the change the pixel matte value to transparent.
				3287	Follow the pixel coordinate with a method (see the <code>color</code> primitive
				3288	for a description of methods). The <code>point</code> method changes the matte
				3289	value of the target pixel. The <code>replace</code> method changes the matte
				3290	value of any pixel that matches the color of the target pixel.
				3291	<code>Floodfill</code> changes the matte value of any pixel that matches the
				3292	color of the target pixel and is a neighbor, whereas <code>filltoborder</code>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3293	changes the matte value of any neighbor pixel that is not the border color (<a
				3294	href="command-line-options.html#bordercolor">-bordercolor</a>). Finally <code>reset</code> changes the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3295	matte value of all pixels.</p>
				3296
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3297	<p>You can set the primitive color, font, and font bounding box color with <a
				3298	href="command-line-options.html#fill">-fill</a>, <a href="command-line-options.html#font">-font</a>, and <a href="command-line-options.html#box">-box</a>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3299	respectively. Options are processed in command line order so be sure to use
				3300	these options <var>before</var> the <a href="command-line-options.html#draw">-draw</a> option.</p>
				3301
				3302	<p>Strings that begin with a number must be quoted (e.g. use '1.png' rather
				3303	than 1.png).</p>
				3304
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3305	<p>Drawing primitives conform to the <a href="magick-vector-graphics.html" >Magick
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3306	Vector Graphics</a> format.</p>
				3307
				3308
				3309	<div style="margin: auto;">
				3310	<h3 class="magick-header"><a id="duplicate"></a>-duplicate <var>count,indexes</var></h3>
				3311	</div>
				3312
				3313	<p class="magick-description">duplicate an image one or more times.</p>
				3314
				3315	<p>Specify the count and the image to duplicate by its index in the sequence.
				3316	The first image is index 0. Negative indexes are relative to the end of the
				3317	sequence, for example, -1 represents the last image of the sequence. Specify
				3318	a range of images with a dash (e.g. 0-4). Separate indexes with a comma (e.g.
				3319	0,2). Use <code>+duplicate</code> to duplicate the last image in the current
				3320	image sequence.</p>
				3321
				3322	<div style="margin: auto;">
				3323	<h3 class="magick-header"><a id="edge"></a>-edge <var>radius</var></h3>
				3324	</div>
				3325
				3326	<p class="magick-description">detect edges within an image.</p>
				3327
				3328	<div style="margin: auto;">
				3329	<h3 class="magick-header"><a id="emboss"></a>-emboss <var>radius</var></h3>
				3330	</div>
				3331
				3332	<p class="magick-description">emboss an image.</p>
				3333
				3334	<div style="margin: auto;">
				3335	<h3 class="magick-header"><a id="encipher"></a>-encipher <var>filename</var></h3>
				3336	</div>
				3337
				3338	<p class="magick-description">Encipher pixels for later deciphering by <a href="command-line-options.html#decipher">-decipher</a>.</p>
				3339
				3340	<p>Get the passphrase from the file specified by <var>filename</var>.</p>
				3341
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3342	<p>For more information, see the webpage, <a
Cristy	364a72f	2016-11-04 22:38:41 -0400	[diff] [blame]	3343	href="https://www.imagemagick.org/www/cipher.html">ImageMagick: Encipher or
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3344	Decipher an Image</a>.</p>
				3345
				3346
				3347
				3348	<div style="margin: auto;">
				3349	<h3 class="magick-header"><a id="encoding"></a>-encoding <var>type</var></h3>
				3350	</div>
				3351
				3352	<p class="magick-description">specify the text encoding.</p>
				3353
				3354	<p>Choose from</p>
				3355
				3356	<pre>
				3357	AdobeCustom AdobeExpert
				3358	AdobeStandard AppleRoman
				3359	BIG5 GB2312
				3360	Latin 2 None
				3361	SJIScode Symbol
				3362	Unicode Wansung
				3363	</pre>
				3364
				3365	<div style="margin: auto;">
				3366	<h3 class="magick-header"><a id="endian"></a>-endian <var>type</var></h3>
				3367	</div>
				3368
				3369	<p class="magick-description">Specify endianness (<code>MSB</code> or <code>LSB</code>) of the image.</p>
				3370
				3371	<p>To print a complete list of endian types, use the <a href="command-line-options.html#list">-list endian</a> option.</p>
				3372
				3373	<p>Use <a href="command-line-options.html#endian">+endian</a> to revert to unspecified endianness.</p>
				3374
				3375
				3376	<div style="margin: auto;">
				3377	<h3 class="magick-header"><a id="enhance"></a>-enhance</h3>
				3378	</div>
				3379
				3380	<p class="magick-description">Apply a digital filter to enhance a noisy image.</p>
				3381
				3382
				3383	<div style="margin: auto;">
				3384	<h3 class="magick-header"><a id="equalize"></a>-equalize</h3>
				3385	</div>
				3386
				3387	<p class="magick-description">perform histogram equalization on the image channel-by-channel.</p>
				3388
				3389	<p>To perform histogram equalization on all channels in concert, transform the
				3390	image into some other color space, such as HSL, OHTA, YIQ or YUV, then
				3391	equalize the appropriate intensity-like channel, then convert back to RGB.</p>
				3392
				3393	<p>For example using HSL, we have: ... <code>-colorspace HSL -channel lightness
				3394	-equalize -colorspace RGB</code> ...</p>
				3395
				3396	<p>For YIQ, YUV and OHTA use the red channel. For example, OHTA is a principal
				3397	components transformation that puts most of the information in the first
				3398	channel. Here we have ... <code>-colorspace OHTA -channel red -equalize
				3399	-colorspace RGB</code> ...</p>
				3400
				3401	<div style="margin: auto;">
				3402	<h3 class="magick-header"><a id="evaluate"></a>-evaluate <var>operator value</var></h3>
				3403	</div>
				3404
				3405	<p class="magick-description">Alter channel pixels by evaluating an arithmetic, relational, or logical expression.</p>
				3406
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3407	<p>(See the <a href="command-line-options.html#function" >-function</a> operator for some
				3408	multi-parameter functions. See the <a href="command-line-options.html#fx" >-fx</a> operator if more
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3409	elaborate calculations are needed.)</p>
				3410
				3411	<p>The behaviors of each <var>operator</var> are summarized in the
				3412	following list. For brevity, the numerical value of a "pixel" referred to
				3413	below is the value of the corresponding channel of that pixel, while
				3414	a "normalized pixel" is that number divided by the maximum
				3415	(installation-dependent) value <var>QuantumRange</var>. (If
				3416	normalized pixels are used, they are restored, following the other
				3417	calculations, to the full range by multiplying by <var>QuantumRange</var>.)</p>
				3418
				3419	<table class="table table-condensed table-striped">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3420	<col width="25%" />
				3421	<col width="75%" />
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3422	<thead>
				3423	<tr>
				3424	<th><var>operator</var></th>
				3425	<th>Summary (see further below for details)</th>
				3426	</tr>
				3427	</thead>
				3428	<tbody>
				3429
				3430	<tr><td>Abs </td> <td>Add <var>value</var> to pixels and return absolute value. </td></tr>
				3431	<tr><td>Add </td> <td>Add <var>value</var> to pixels. </td></tr>
				3432	<tr><td>AddModulus </td> <td>Add <var>value</var> to pixels modulo <var>QuantumRange</var>.</td></tr>
				3433	<tr><td>And </td> <td>Binary AND of pixels with <var>value</var>.</td></tr>
				3434	<tr><td>Cos, Cosine </td> <td>Apply cosine to pixels with frequency <var>value</var> with 50% bias added.</td></tr>
				3435	<tr><td>Divide </td> <td>Divide pixels by <var>value</var>.</td></tr>
				3436	<tr><td>Exp </td> <td>base-e exponential function</td></tr>
				3437	<tr><td>Exponential </td> <td>base-e exponential function</td></tr>
				3438	<tr><td>LeftShift </td> <td>Shift the pixel values left by <var>value</var> bits (i.e., multiply pixels by 2<sup><var>value</var></sup>).</td></tr>
				3439	<tr><td>Log </td> <td>Apply scaled logarithm to normalized pixels.</td></tr>
				3440	<tr><td>Max </td> <td>Set pixels to maximum of <var>value</var> and current pixel <var>value</var> (i.e. set any pixels currently less than <var>value</var> to <var>value</var>).</td></tr>
				3441	<tr><td>Mean </td> <td>Add the <var>value</var> and divide by 2.</td></tr>
				3442	<tr><td>Median </td> <td>Choose the median value from an image sequence.</td></tr>
				3443	<tr><td>Min </td> <td>Set pixels to minimum of <var>value</var> and current pixel <var>value</var> (i.e. set any pixels currently greater than <var>value</var> to <var>value</var>).</td></tr>
				3444	<tr><td>Multiply </td> <td>Multiply pixels by <var>value</var>.</td></tr>
				3445	<tr><td>Or </td> <td>Binary OR of pixels with <var>value</var>.</td></tr>
				3446	<tr><td>Pow </td> <td>Raise normalized pixels to the power <var>value</var>.</td></tr>
				3447	<tr><td>RightShift </td> <td>Shift the pixel values right by <var>value</var> bits (i.e., divide pixels by 2<sup><var>value</var></sup>).</td></tr>
				3448	<tr><td>RMS</td> <td>Square the pixel and add the <var>value</var>.</td></tr>
				3449	<tr><td>RootMeanSquare</td> <td>Square the pixel and add the <var>value</var>.</td></tr>
				3450	<tr><td>Set </td> <td>Set pixel equal to <var>value</var>.</td></tr>
				3451	<tr><td>Sin, Sine </td> <td>Apply sine to pixels with frequency <var>value</var> with 50% bias added.</td></tr>
				3452	<tr><td>Subtract </td> <td>Subtract <var>value</var> from pixels.</td></tr>
				3453	<tr><td>Xor </td> <td>Binary XOR of pixels with <var>value.</var></td></tr>
				3454
				3455	<tr><td> </td><td> </td></tr>
				3456
				3457	<tr><td>Gaussian-noise</td><td> </td></tr>
				3458	<tr><td>Impulse-noise</td><td> </td></tr>
				3459	<tr><td>Laplacian-noise</td><td> </td></tr>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3460	<tr><td>Multiplicative-noise</td> <td>(These are equivalent to the corresponding <a href="command-line-options.html#noise" >-noise</a> operators.)</td></tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3461	<tr><td>PoissonNoise</td><td> </td></tr>
				3462	<tr><td>Uniform-noise</td><td> </td></tr>
				3463
				3464	<tr><td> </td><td> </td></tr>
				3465
				3466	<tr><td>Threshold </td> <td>Threshold pixels larger than <var>value</var>.</td></tr>
				3467	<tr><td>ThresholdBlack </td> <td>Threshold pixels to zero values equal to or below <var>value</var>.</td></tr>
				3468	<tr><td>ThresholdWhite </td> <td>Threshold pixels to maximum values above <var>value</var>. </td></tr>
				3469	</tbody>
				3470	</table>
				3471
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3472	<p>The specified functions are applied only to each previously set <a
				3473	href="command-line-options.html#channel" >-channel</a> in the image. If necessary, the results of the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3474	calculations are truncated (clipped) to fit in the interval [0, <var>QuantumRange</var>]. The transparency channel of the image is
				3475	represented as a 'alpha' values (0 = fully transparent), so, for example, a
				3476	<code>Divide</code> by 2 of the alpha channel will make the image
				3477	semi-transparent. Append the percent symbol '<code>%</code>' to specify a value
				3478	as a percentage of the <var>QuantumRange</var>.</p>
				3479
				3480	<p>To print a complete list of <a href="command-line-options.html#evaluate">-evaluate</a> operators, use
				3481	<a href="command-line-options.html#list">-list evaluate</a>.</p>
				3482
				3483	<p>The results of the <code>Add</code>, <code>Subtract</code> and
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3484	<code>Multiply</code> methods can also be achieved using either the <a
				3485	href="command-line-options.html#level" >-level</a> or the <a href="command-line-options.html#level" >+level</a> operator, with
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3486	appropriate argument, to linearly modify the overall range of color values.
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3487	Please note, however, that <a href="command-line-options.html#level" >-level</a> treats transparency as
				3488	'matte' values (0 = opaque), while <a href="command-line-options.html#level" >-evaluate</a> works with
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3489	'alpha' values.</p>
				3490
				3491	<p><code>AddModulus</code> has been added as of ImageMagick 6.4.8-4 and provides
				3492	addition modulo the <var>QuantumRange</var>. It is therefore
				3493	equivalent to <code>Add</code> unless the resulting pixel value is outside the
				3494	interval [0, <var>QuantumRange</var>]. </p>
				3495
				3496	<p><code>Exp or Exponential</code> has been added as of ImageMagick 6.6.5-1 and
				3497	works on normalized pixel values. The <var>value</var> used with
				3498	<code>Exp</code> should be negative so as to produce a decaying exponential
				3499	function. Non-negative values will always produce results larger unity and
				3500	thus outside the interval [0, <var>QuantumRange</var>]. The
				3501	formula is expressed below. </p>
				3502
				3503	<p class="text-center">
				3504	exp(<var>value</var> × <b><var>u</var></b>)
				3505	</p>
				3506
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3507	<p> If the input image is squared, for example, using <a href="command-line-options.html#-function"
				3508	>-function polynomial "2 0 0"</a>, then a decaying Gaussian function will be
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3509	the result.</p>
				3510
				3511	<p><code>Log</code> has been added as of ImageMagick 6.4.2-1 and works on
				3512	normalized pixel values. This a <var>scaled</var> log function. The <var>value</var> used with <code>Log</code> provides a <var>scaling
				3513	factor</var> that adjusts the curvature in the graph of the log function. The
				3514	formula applied to a normalized value <b><var>u</var></b> is below. </p>
				3515
				3516	<p class="text-center">
				3517	log(<var>value</var> × <b><var>u</var></b> + 1) / log(<var>value</var> + 1)
				3518	</p>
				3519
				3520	<p><code>Pow</code> has been added as of ImageMagick 6.4.1-9, and works on
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3521	normalized pixel values. Note that <code>Pow</code> is related to the <a
				3522	href="command-line-options.html#gamma" >-gamma</a> operator. For example, <b>-gamma 2</b> is equivalent
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3523	to <b>-evaluate pow 0.5</b>, i.e., a 'square root' function. The value used
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3524	with <a href="command-line-options.html#gamma" >-gamma</a> is simply the reciprocal of the value used
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3525	with <code>Pow</code>.</p>
				3526
				3527	<p><code>Cosine</code> and <code>Sine</code> was added as of IM v6.4.8-8 and
				3528	converts the image values into a value according to a (co)sine wave function.
				3529	The synonyms <code>Cos</code> and <code>Sin</code> may also be used. The output
				3530	is biased 50% and normalized by 50% so as to fit in the respective color value
				3531	range. The <var>value</var> scaling of the <var>period</var> of the
				3532	function (its frequency), and thus determines the number of 'waves' that will
				3533	be generated over the input color range. For example, if the <var>value</var> is 1, the effective period is simply the <var>QuantumRange</var>; but if the <var>value</var> is 2,
				3534	then the effective period is the <var>half</var> the <var>QuantumRange</var>.</p>
				3535
				3536	<p class="text-center">
				3537	0.5 + 0.5 × cos(2 π <b><var>u</var></b> × <var>value</var>).
				3538	</p>
				3539
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3540	<p>See also the <a href="command-line-options.html#function" >-function</a> operator, which is a
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3541	multi-value version of evaluate. </p>
				3542
				3543	<div style="margin: auto;">
				3544	<h3 class="magick-header"><a id="evaluate-sequence"></a>-evaluate-sequence <var>operator</var></h3>
				3545	</div>
				3546
				3547	<p class="magick-description">Alter channel pixels by evaluating an arithmetic, relational, or
				3548	logical expression over a sequence of images.</p>
				3549
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3550	<p>To print a complete list of <a
				3551	href="command-line-options.html#evaluate-sequence">-evaluate-sequence</a> operators, use <a
				3552	href="command-line-options.html#list">-list evaluate</a>.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3553
				3554	<div style="margin: auto;">
				3555	<h3 class="magick-header"><a id="extent"></a>-extent <var>geometry</var></h3>
				3556	</div>
				3557
				3558	<p class="magick-description">Set the image size and offset.</p>
				3559
				3560	<p>If the image is enlarged, unfilled areas are set to the background color.
				3561	To position the image, use offsets in the <var>geometry</var>
				3562	specification or precede with a <a href="command-line-options.html#gravity">-gravity</a> setting. To
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3563	specify how to compose the image with the background, use <a href="command-line-options.html#compose"
				3564	>-compose</a>.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3565
				3566	<p>This command reduces or expands a JPEG image to fit on an 800x600
				3567	display. If the aspect ratio of the input image isn't exactly 4:3, then the
				3568	image is centered on an 800x600 black canvas: </p>
				3569
				3570	<pre>
				3571	convert input.jpg -resize 800x600 -background black -compose Copy \
				3572	-gravity center -extent 800x600 -quality 92 output.jpg
				3573	</pre>
				3574
				3575	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				3576
				3577	<div style="margin: auto;">
				3578	<h3 class="magick-header"><a id="extract"></a>-extract <var>geometry</var></h3>
				3579	</div>
				3580
				3581	<p class="magick-description">Extract the specified area from image.</p>
				3582
				3583	<p>This option is most useful for extracting a subregion of a very large raw
				3584	image. Note that these two commands are equivalent:</p>
				3585
				3586	<pre>
				3587	convert -size 16000x16000 -depth 8 -extract 640x480+1280+960 \
				3588	image.rgb image.png",
				3589	convert -size 16000x16000 -depth 8 'image.rgb[640x480+1280+960]' \
				3590	image.rgb image.png"
				3591	</pre>
				3592
				3593	<p>If you omit the offsets, as in</p>
				3594
				3595	<pre>
				3596	convert -size 16000x16000 -depth 8 -extract 640x480 \
				3597	image.rgb image.png
				3598	</pre>
				3599
				3600	<p>the image is <var>resized</var> to the specified dimensions instead,
				3601	equivalent to:</p>
				3602
				3603	<pre>
				3604	convert -size 16000x16000 -depth 8 -resize 640x480 image.rgb image.png
				3605	</pre>
				3606
				3607	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				3608
				3609	<div style="margin: auto;">
				3610	<h3 class="magick-header"><a id="family"></a>-family <var>fontFamily</var></h3>
				3611	</div>
				3612
				3613	<p class="magick-description">Set a font family for text.</p>
				3614
				3615	<p>This setting suggests a font family that ImageMagick should try to use for
				3616	rendering text. If the family can be found it is used; if not, a default font
				3617	(e.g., "Arial") or a family known to be similar is substituted (e.g.,
				3618	"Courier" might be used if "System" is requested but not found). </p>
				3619
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3620	<p>For other settings that affect fonts, see the options <a
				3621	href="command-line-options.html#font">-font</a>, <a href="command-line-options.html#stretch">-stretch</a>, <a
				3622	href="command-line-options.html#style">-style</a>, and <a href="command-line-options.html#weight">-weight</a>. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3623
				3624	<div style="margin: auto;">
				3625	<h3 class="magick-header"><a id="features"></a>-features <var>distance</var></h3>
				3626	</div>
				3627
				3628	<p class="magick-description">display (co-occurrence matrix) texture measure features for each channel in the image in each of four directions (horizontal, vertical, left and right diagonals) for the specified distance.</p>
				3629
				3630	<pre>
				3631	Angular Second Moment Sum Entropy
				3632	Contrast Entropy
				3633	Correlation Difference Variance
				3634	Sum of Squares Variance Difference Entropy
				3635	Inverse Difference Moment Information Measure of Correlation 1
				3636	Sum Average Information Measure of Correlation 2
				3637	Sum Variance Maximum Correlation Coefficient
				3638	</pre>
				3639
				3640	<div style="margin: auto;">
				3641	<h3 class="magick-header"><a id="fft"></a>-fft</h3>
				3642	</div>
				3643
				3644	<p class="magick-description">implements the forward discrete Fourier transform (DFT).</p>
				3645
				3646	<p>This option is new as of ImageMagick 6.5.4-3 (and now working for Windows
				3647	users in ImageMagick 6.6.0-9). It transforms an image from the normal
				3648	(spatial) domain to the frequency domain. In the frequency domain, an image is
				3649	represented as a superposition of complex sinusoidal waves of varying
				3650	amplitudes. The image x and y coordinates are the possible frequencies along
				3651	the x and y directions, respectively, and the pixel intensity values are
				3652	complex numbers that correspond to the sinusoidal wave amplitudes. See for
				3653	example, <a href="http://en.wikipedia.org/wiki/Fourier_transform">Fourier
				3654	Transform</a>, <a href="http://en.wikipedia.org/wiki/DFT">Discrete Fourier
				3655	Transform</a> and <a href="http://en.wikipedia.org/wiki/FFT">Fast Fourier
				3656	Transform</a>.</p>
				3657
				3658	<p>A single image name is provided as output for this option. However, the
				3659	output result will have two components. It is either a two-frame image or two
				3660	separate images, depending upon whether the image format specified supports
				3661	multi-frame images. The reason that we get a dual output result is because the
				3662	frequency domain represents an image using complex numbers, which cannot be
				3663	visualized directly. Therefore, the complex values are automagically separated
				3664	into a two-component image representation. The first component is the
				3665	magnitude of the complex number and the second is the phase of the complex
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3666	number. See for example, <a
				3667	href="http://en.wikipedia.org/wiki/Complex_numbers">Complex Numbers</a>.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3668
				3669	<p>The magnitude and phase component images must be specified using image
				3670	formats that do not limit the color or compress the image. Thus, MIFF, TIF,
				3671	PFM, EXR and PNG are the recommended image formats to use. All of these
				3672	formats, except PNG support multi-frame images. So for example,</p>
				3673
				3674	<pre>
				3675	convert image.png -fft fft_image.miff
				3676	</pre>
				3677
				3678	<p>generates a magnitude image as <code>fft_image.miff[0]</code> and a phase
				3679	image as <code>fft_image.miff[1]</code>. Similarly,</p>
				3680
				3681	<pre>
				3682	convert image.png -fft fft_image.png
				3683	</pre>
				3684
				3685	<p>generates a magnitude image as <code>fft_image-0.png</code> and a phase image
				3686	as <code>fft_image-1.png</code>. If you prefer this representation, then you can
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3687	force any of the other formats to produce two output images by including <a
				3688	href="command-line-options.html#adjoin">+adjoin</a> following -fft in the command line.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3689
				3690	<p>The input image can be any size, but if not square and even-dimensioned, it
				3691	is padded automagically to the larger of the width or height of the input
				3692	image and to an even number of pixels. The padding will occur at the bottom
				3693	and/or right sides of the input image. The resulting output magnitude and
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3694	phase images is square at this size. The kind of padding relies on the <a
				3695	href="command-line-options.html#virtual-pixel">-virtual-pixel</a> setting.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3696
				3697	<p>Both output components will have dynamic ranges that fit within
				3698	[0, <var>QuantumRange</var>], so that HDRI need not be enabled.
				3699	Phase values nominally range from 0 to 2*π, but is scaled to span the full
				3700	dynamic range. (The first few releases had non-HDRI scaled but HDRI not
				3701	scaled). The magnitude image is not scaled and thus generally will contain
				3702	very small values. As such, the image normally will appear totally black. In
				3703	order to view any detail, the magnitude image typically is enhanced with a log
				3704	function into what is usually called the spectrum. A log function is used to
				3705	enhance the darker values more in comparison to the lighter values. This can
				3706	be done, for example, as follows:</p>
				3707
				3708	<pre>
				3709	convert fft_image.miff[0] -contrast-stretch 0 \
				3710	-evaluate log 1000 fft_image_spectrum.png"
				3711	</pre>
				3712
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3713	<p>where either <a href="command-line-options.html#contrast-stretch">-contrast-stretch</a> 0 or <a
				3714	href="command-line-options.html#auto-level">-auto-level</a> is used to scale the image to full dynamic
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3715	range, first. The argument to the <a href="command-line-options.html#evaluate">-evaluate</a> log
				3716	typically is specified between 100 and 10,000, depending upon the amount of
				3717	detail that one wants to bring out in the spectrum. Larger values produce more
				3718	visible detail. Too much detail, however, may hide the important features.</p>
				3719
				3720	<p>The <a href="http://www.fftw.org/">FFTW</a> delegate library is required to
				3721	use <a href="command-line-options.html#fft">-fft</a>.</p>
				3722
				3723	<p>Use <a href="command-line-options.html#fft">+fft</a> to produce two output images that are the real
				3724	and imaginary components of the complex valued Fourier transform.</p>
				3725
				3726	<p>However, as the real and imaginary components can contain negative values,
				3727	this requires that IM be configured with HDRI enabled. In this case, you must
				3728	use either MIFF, TIF, PFM or MPC formats for the real and imaginary component
				3729	results, since they are formats that preserve both negative and fractional
				3730	values without clipping them or truncating the fractional part. With either
				3731	MIFF or TIF, one should add -define quantum:format=32, to allow those image
				3732	types to work properly in HDRI mode without clipping.</p>
				3733
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3734	<p>The real and imaginary component images resulting from <a
				3735	href="command-line-options.html#fft">+fft</a> are also square, even dimensioned images due to the same
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3736	padding that was discussed above for the magnitude and phase component
				3737	images.</p>
				3738
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3739	<p>See the discussion on HDRI implementations of ImageMagick on the page <a
				3740	href="high-dynamic-range.html" >High Dynamic-Range Images</a>. For more
				3741	about HDRI go the ImageMagick <a
Cristy	364a72f	2016-11-04 22:38:41 -0400	[diff] [blame]	3742	href="https://www.imagemagick.org/Usage/basics/#hdri" >Usage</a> pages, <a
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3743	href="http://www.fmwconcepts.com/imagemagick/fourier_transforms/fourier.html"
				3744	>Fred's Fourier Processing With ImageMagick page</a> or this <a
				3745	href="http://en.wikipedia.org/wiki/High_dynamic_range_imaging" >Wikipedia</a>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3746	entry. </p>
				3747
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3748	<p>By default the FFT is normalized (and the IFT is not). Use "<code><a href="command-line-options.html#define" >-define</a> fourier:normalize=forward</code> to explicitly normalize the FFT and unnormalize the IFT.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3749
				3750
				3751	<div style="margin: auto;">
				3752	<h3 class="magick-header"><a id="fill"></a>-fill <var>color</var></h3>
				3753	</div>
				3754
				3755	<p class="magick-description">color to use when filling a graphic primitive.</p>
				3756
				3757	<p>This option accepts a color name, a hex color, or a numerical RGB, RGBA,
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3758	HSL, HSLA, CMYK, or CMYKA specification. See <a href="color.html" >Color Names</a> for
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3759	a description of how to properly specify the color argument.</p>
				3760
				3761	<p>Enclose the color specification in quotation marks to prevent the "#" or
				3762	the parentheses from being interpreted by your shell.</p>
				3763
				3764	<p>For example,</p>
				3765
				3766	<pre>
				3767	-fill blue
				3768	-fill "#ddddff"
				3769	-fill "rgb(255,255,255)"
				3770	</pre>
				3771
				3772	<p>See <a href="command-line-options.html#draw">-draw</a> for further details.</p>
				3773
				3774	<p>To print a complete list of color names, use the <a href="command-line-options.html#list">-list color</a> option.</p>
				3775
				3776	<div style="margin: auto;">
				3777	<h3 class="magick-header"><a id="filter"></a>-filter <var>type</var></h3>
				3778	</div>
				3779
				3780	<p class="magick-description">Use this <var>type</var> of filter when resizing or distorting an image.</p>
				3781
				3782	<p>Use this option to affect the resizing operation of an image during
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3783	operations such as <a href="command-line-options.html#resize">-resize</a> and <a href="command-line-options.html#distort"
				3784	>-distort</a>. For example you can use a simple resize filter such as:</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3785
				3786	<pre>
				3787	Point Hermite Cubic
				3788	Box Gaussian Catrom
				3789	Triangle Quadratic Mitchell
				3790	</pre>
				3791
				3792	<p>The <code>Bessel</code> and <code>Sinc</code> filter is also provided (as well
				3793	as a faster <code>SincFast</code> equivalent form). However these filters are
				3794	generally useless on their own as they are infinite filters that are being
				3795	clipped to the filters support size. Their direct use is not recommended
				3796	except via expert settings (see below). </p>
				3797
				3798	<p>Instead these special filter functions are typically windowed by a windowing
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3799	function that the <a href="command-line-options.html#filter" >-filter</a> setting defines. That is
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3800	using these functions will define a 'Windowed' filter, appropriate to the
				3801	operator involved. Windowed filters include: </p>
				3802
				3803	<pre>
				3804	Lanczos Hamming Parzen
				3805	Blackman Kaiser Welsh
				3806	Hanning Bartlett Bohman
				3807	</pre>
				3808
				3809	<p>Also one special self-windowing filter is also provided
				3810	<code>Lagrange</code>, which will automagically re-adjust its function depending
				3811	on the current 'support' or 'lobes' expert settings (see below).</p>
				3812
				3813	<p>If you do not select a filter with this option, the filter defaults to
				3814	<code>Mitchell</code> for a colormapped image, an image with a matte channel, or
				3815	if the image is enlarged. Otherwise the filter default to
				3816	<code>Lanczos</code>.</p>
				3817
				3818	<p>To print a complete list of resize filters, use the <a href="command-line-options.html#list">-list
				3819	filter</a> option.</p>
				3820
				3821	<p>You can modify how the filter behaves as it scales your image through the
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3822	use of these expert settings (see also <a href="command-line-options.html#define" >-define</a> and <a
				3823	href="command-line-options.html#set" >-set</a>):-</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3824
				3825	<table class="table table-condensed table-striped">
				3826	<tr>
				3827	<td>-define filter:blur=<var>factor</var></td>
				3828	<td>Scale the X axis of the filter (and its window). Use > 1.0 for
				3829	blurry or < 1.0 for sharp. This should only be used with Gaussian and
				3830	Gaussian-like filters simple filters, or you may not get the expected
				3831	results. </td>
				3832	</tr>
				3833
				3834	<tr>
				3835	<td>-define filter:support=<var>radius</var></td>
				3836	<td>Set the filter support radius. Defines how large the filter should be and
				3837	thus directly defines how slow the filtered resampling process is. All
				3838	filters have a default 'preferred' support size. Some filters like
				3839	<code>Lagrange</code> and windowed filters adjust themselves depending on
				3840	this value. With simple filters this value either does nothing (but slow
				3841	the resampling), or will clip the filter function in a detrimental way.
				3842	</td>
				3843	</tr>
				3844
				3845	<tr>
				3846	<td>-define filter:lobes=<var>count</var></td>
				3847	<td>Set the number of lobes to use for the Sinc/Bessel filter. This an
				3848	alternative way of specifying the 'support' range of the filter, that is
				3849	designed to be more suited to windowed filters, especially when used for
				3850	image distorts.</td>
				3851	</tr>
				3852
				3853	<tr>
				3854	<td>-define filter:sigma=<var>value</var></td>
				3855	<td>The 'sigma' value used to define the <code>Gaussian</code> filter. Default
				3856	sigma value is '<code>0.5</code>'. It only effects <code>Gaussian</code> but
				3857	does not shrink (but may enlarge) the filter's 'support'. It can be used
				3858	to generate very small blurs but without the filter 'missing' pixels due
				3859	to using a small support setting. A larger value of '<code>0.707</code>'
				3860	(a value of '1/sqrt(2)') is another common setting. </td>
				3861	</tr>
				3862
				3863	<tr>
				3864	<td>-define filter:b=<var>b-spline_factor</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3865	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3866	<td>-define filter:c=<var>keys_alpha_factor</var></td>
				3867	<td>Redefine the values used for cubic filters such as <code>Cubic</code>,
				3868	<code>Catrom</code>, <code>Mitchel</code>, and <code>Hermite</code>, as well as
				3869	the <code>Parzen</code> cubic windowing function. If only one of the values
				3870	are defined, the other is set so as to generate a 'Cubic-Keys' filter.
				3871	The values meaning was defined by a research paper by
				3872	Mitchell-Netravali.</td>
				3873	</tr>
				3874
				3875	<tr>
				3876	<td>-define filter:kaiser-beta=<var>value</var></td>
				3877	<td>The 'alpha' value used to as part of the Kaiser Windowing function.
				3878	Default value is '6.5'. It only effects Kaiser windowing function, and
				3879	does not effect any other attributes.
				3880	Before ImageMagick v6.7.6-10, this option was known as "filter:alpha", (an
				3881	inheritance from the very old "zoom" program). It was changed to bring the
				3882	function in line with more modern academic research usage, and better
				3883	assign it be more definitive. </td>
				3884	</tr>
				3885
				3886	<tr>
				3887	<td>-define filter:kaiser-alpha=<var>value</var></td>
				3888	<td>This value when multiplied by 'PI' is equivalent to "kaiser-beta", and
				3889	will override that setting. It only effects Kaiser windowing function,
				3890	and does not effect any other attributes. </td>
				3891	</tr>
				3892
				3893	<tr>
				3894	<td>-define filter:filter=<var>filter_function</var></td>
				3895	<td>Use this function directly as the weighting filter. This will allow
				3896	you to directly use a windowing function such as <code>Blackman</code>,
				3897	as a resampling filter, rather than as its normal usage as a windowing
				3898	function. If defined, no windowing function also defined, the window function is set
				3899	to <code>Box</code>). Directly specifying <code>Sinc</code> or <code>Jinc</code>
				3900	as a filter will also do this. </td>
				3901	</tr>
				3902
				3903	<tr>
				3904	<td>-define filter:window=<var>filter_function</var></td>
				3905	<td>The IIR (infinite impulse response) filters <code>Sinc</code> and
				3906	<code>Jinc</code> are windowed (brought down to zero over the defined
				3907	support range) with the given filter. This allows you to specify a filter
				3908	function to be used as a windowing function for these IIR filters.
				3909	Many of the defined filters are actually windowing functions for these IIR
				3910	filters. A typical choices is <code>Box</code>, (which effectively turns
				3911	off the windowing function). </td>
				3912	</tr>
				3913
				3914	<tr>
				3915	<td>-define filter:win-support=<var>radius</var></td>
				3916	<td>Scale windowing function to this size instead. This causes the windowing
				3917	(or self-windowing Lagrange filter) to act is if the support window is
				3918	larger than what is actually supplied to the calling operator. The filter
				3919	however is still clipped to the real support size given. If unset this
				3920	will equal the normal filter support size. </td>
				3921	</tr>
				3922
				3923	<tr>
				3924	<td>-define filter:verbose=<var>1</var></td>
				3925	<td>This causes IM to print information on the final internal filter
				3926	selection to standard output. This includes a commented header on the
				3927	filter settings being used, and data allowing the filter weights to be
				3928	easily graphed. Note however that some filters are internally defined in terms of other filters. The <code>Lanczos</code> filter for example is defined in terms of
				3929	a <code>SincFast</code> windowed <code>SincFast</code> filter, while
				3930	<code>Mitchell</code> is defined as a general <code>Cubic</code> family filter
				3931	with specific 'B' and 'C' settings. </td>
				3932	</tr>
				3933
				3934	</table>
				3935
				3936	<p>For example, to get a 8 lobe jinc windowed sinc filter (Genseng filter?):</p>
				3937
				3938	<pre>
				3939	convert image.png \
				3940	-filter sinc \
				3941	-set filter:window=jinc \
				3942	-set filter:lobes=8 \
				3943	-resize 150% image.jpg"
				3944	</pre>
				3945
				3946	<p>Or a raw un-windowed Sinc filter with 4 lobes:</p>
				3947
				3948	<pre>
				3949	convert image.png \
				3950	-set filter:filter=sinc \
				3951	-set filter:lobes=4 \
				3952	-resize 150% image.jpg"
				3953	</pre>
				3954
				3955	<p>To extract the data for a raw windowing function, combine it with
				3956	a '<code>Box</code>' filter. For example the '<code>Welch</code> parabolic
				3957	windowing function. </p>
				3958
				3959	<pre>
				3960	convert null: -define filter:filter=Box \
				3961	-define filter:window=Welch \
				3962	-define filter:support=1.0 \
				3963	-define filter:verbose=1 \
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3964	-resize 2 null: > window_welch.dat
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3965	gnuplot
				3966	set grid
				3967	plot \"window_welch.dat\" with lines
				3968	</pre>
				3969
				3970	<p>Note that the use of expert options is provided for image processing experts
				3971	who have studied and understand how resize filters work. Without this
				3972	knowledge, and an understanding of the definition of the actual filters
				3973	involved, using expert settings are more likely to be detrimental to your image
				3974	resizing.</p>
				3975
				3976
				3977	<div style="margin: auto;">
				3978	<h3 class="magick-header"><a id="flatten"></a>-flatten</h3>
				3979	</div>
				3980
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3981	<p class="magick-description">This is a simple alias for the <a href="command-line-options.html#layers" >-layers</a> method "flatten".</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3982
				3983
				3984	<div style="margin: auto;">
				3985	<h3 class="magick-header"><a id="flip"></a>-flip</h3>
				3986	</div>
				3987
				3988	<p class="magick-description">create a <var>mirror image</var></p>
				3989
				3990	<p>reflect the scanlines in the vertical direction. The image will be mirrored
				3991	upside-down. </p>
				3992
				3993
				3994	<div style="margin: auto;">
				3995	<h3 class="magick-header"><a id="floodfill"></a>-floodfill {<var>+-</var>}<var>x</var>{<var>+-</var>}<var>y</var> <var>color</var></h3>
				3996	</div>
				3997
				3998	<p class="magick-description">floodfill the image with color at the specified offset.</p>
				3999
				4000	<p>Flood fill starts from the given 'seed point' which is not gravity effected.
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4001	Any color that matches within <a href="command-line-options.html#fuzz" >-fuzz</a> color distance of the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4002	given <var>color</var> argument, connected to that 'seed point'
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4003	will be replaced with the current <a href="command-line-options.html#fill" >-fill</a> color. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4004
				4005	<p>Note that if the pixel at the 'seed point' does not itself match the given
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4006	<var>color</var> (according to <a href="command-line-options.html#fuzz" >-fuzz</a>), then no
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4007	action will be taken. </p>
				4008
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4009	<p>This operator works more like the <a href="command-line-options.html#opaque" >-opaque</a> option, than
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4010	a more general flood fill that reads the matching color directly at the 'seed
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4011	point'. For this form of flood fill, look at <a href="command-line-options.html#draw" >-draw</a> and
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4012	its 'color floodfill' drawing method. </p>
				4013
				4014
				4015	<div style="margin: auto;">
				4016	<h3 class="magick-header"><a id="flop"></a>-flop</h3>
				4017	</div>
				4018
				4019	<p class="magick-description">create a <var>mirror image</var>.</p>
				4020
				4021	<p>Reflect the scanlines in the horizontal direction, just like the image in
				4022	a vertical mirror. </p>
				4023
				4024
				4025	<div style="margin: auto;">
				4026	<h3 class="magick-header"><a id="font"></a>-font <var>name</var></h3>
				4027	</div>
				4028
				4029	<p class="magick-description">set the font to use when annotating images with text, or creating labels.</p>
				4030
				4031	<p>To print a complete list of fonts, use the <a href="command-line-options.html#list">-list font</a>
				4032	option (for versions prior to 6.3.6, use 'type' instead of 'font').</p>
				4033
				4034	<p>In addition to the fonts specified by the above pre-defined list, you can
				4035	also specify a font from a specific source. For example <code>Arial.ttf</code>
				4036	is a TrueType font file, <code>ps:helvetica</code> is PostScript font, and
				4037	<code>x:fixed</code> is X11 font.</p>
				4038
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4039	<p>For other settings that affect fonts, see the options <a
				4040	href="command-line-options.html#family">-family</a>, <a href="command-line-options.html#stretch">-stretch</a>, <a
				4041	href="command-line-options.html#style">-style</a>, and <a href="command-line-options.html#weight">-weight</a>. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4042
				4043
				4044	<div style="margin: auto;">
				4045	<h3 class="magick-header"><a id="foreground"></a>-foreground <var>color</var></h3>
				4046	</div>
				4047
				4048	<p class="magick-description">Define the foreground color for menus.", "display</p>
				4049
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4050	<p>The color is specified using the format described under the <a
				4051	href="command-line-options.html#fill">-fill</a> option.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4052
				4053	<p>The default foreground color is black.</p>
				4054
				4055	<div style="margin: auto;">
				4056	<h3 class="magick-header"><a id="format"></a>-format <var>type</var></h3>
				4057	</div>
				4058
				4059	<p class="magick-description">the image format type.</p>
				4060
				4061	<p>When used with the <code>mogrify</code> utility, this option converts any
				4062	image to the image <a href="formats.html">format</a> you specify.
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4063	For a list of image format types supported by ImageMagick, use <a
				4064	href="command-line-options.html#list">-list format</a>.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4065
				4066	<p>By default the file is written to its original name. However, if the
				4067	filename extension matches a supported format, the extension is replaced with
				4068	the image format type specified with <a href="command-line-options.html#format">-format</a>. For
				4069	example, if you specify <var>tiff</var> as the format type and the
				4070	input image filename is <var>image.gif</var>, the output image
				4071	filename becomes <var>image.tiff</var>.</p>
				4072
				4073	<div style="margin: auto;">
				4074	<h3 class="magick-header"><a id="format_identify_"></a>-format <var>string</var></h3>
				4075	</div>
				4076
				4077	<p class="magick-description">output formatted image characteristics.</p>
				4078
				4079	<p>See <a href="escape.html">Format and Print Image
				4080	Properties</a> for an explanation on how to specify the argument to this
				4081	option.</p>
				4082
				4083	<div style="margin: auto;">
				4084	<h3 class="magick-header"><a id="frame"></a>-frame <var>geometry</var></h3>
				4085	</div>
				4086
				4087	<p class="magick-description">Surround the image with a border or beveled frame.</p>
				4088
Cristy	f650f4f	2016-04-01 10:53:07 -0400	[diff] [blame]	4089	<p>The color of the border is specified with the <a href="command-line-options.html#alpha-color"
				4090	>-alpha-color</a> command line option. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4091
				4092	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument. The <var>size</var> portion of the <var>geometry</var> argument indicates the amount of extra width and
				4093	height that is added to the dimensions of the image. If no offsets are given
				4094	in the <var>geometry</var> argument, then the border added is
				4095	a solid color. Offsets <var>x</var> and <var>y</var>, if present, specify that
				4096	the width and height of the border is partitioned to form an outer bevel of
				4097	thickness <var>x</var> pixels and an inner bevel of thickness
				4098	<var>y</var> pixels. Negative offsets make no sense as frame arguments.
				4099	</p>
				4100
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4101	<p>The <a href="command-line-options.html#frame">-frame</a> option is affected by the current <a
				4102	href="command-line-options.html#compose">-compose</a> setting and assumes that this is using the default
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4103	'<code>Over</code>' composition method. It generates an image of the appropriate
				4104	size with the current <a href="command-line-options.html#bordercolor">-bordercolor</a> setting, and then
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4105	draws the frame of four distinct colors close to the current <a
Cristy	f650f4f	2016-04-01 10:53:07 -0400	[diff] [blame]	4106	href="command-line-options.html#alpha-color">-alpha-color</a>. The original image is then overlaid onto
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4107	center of this image. This means that with the default compose method of
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4108	'<code>Over</code>' any transparent parts may be replaced by the current <a
				4109	href="command-line-options.html#bordercolor">-bordercolor</a> setting.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4110
				4111	<p>The image composition is not
				4112	affected by the <a href="command-line-options.html#gravity">-gravity</a> option.</p>
				4113
				4114
				4115	<div style="margin: auto;">
				4116	<h3 class="magick-header"><a id="frame_import_"></a>-frame</h3>
				4117	</div>
				4118
				4119	<p class="magick-description">include the X window frame in the imported image. </p>
				4120	<div style="margin: auto;">
				4121	<h3 class="magick-header"><a id="function"></a>-function <var>function</var> <var>parameters</var></h3>
				4122	</div>
				4123
				4124	<p class="magick-description">Apply a function to channel values.</p>
				4125
				4126	<p>This operator performs calculations based on the given arguments to modify
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4127	each of the color values for each previously set <a
				4128	href="command-line-options.html#channel">-channel</a> in the image. See <a
				4129	href="command-line-options.html#evaluate">-evaluate</a> for details concerning how the results of the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4130	calculations are handled.</p>
				4131
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4132	<p>This is can be considered a multi-argument version of the <a
				4133	href="command-line-options.html#evaluate">-evaluate</a> operator. (Added in
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4134	ImageMagick 6.4.8−8.)</p>
				4135
				4136	<p>Here, <var>parameters</var> is a comma-separated list of
				4137	numerical values. The number of values varies depending on which <var>function</var> is selected. Choose the <var>function</var> from:</p>
				4138
				4139	<pre>
				4140	Polynomial
				4141	Sinusoid
				4142	Arcsin
				4143	Arctan
				4144	</pre>
				4145
				4146	<p>To print a complete list of <a href="command-line-options.html#function">-function</a> operators,
				4147	use <a href="command-line-options.html#list">-list function</a>. Descriptions follow.</p>
				4148
				4149	<dl class="dl-horizontal">
				4150	<dt>Polynomial</dt>
				4151	<dd><p>The <code>Polynomial</code> function takes an arbitrary number of parameters,
				4152	these being the coefficients of a polynomial, in decreasing order of degree.
				4153	That is, entering</p>
				4154
				4155	<pre>
				4156	-function Polynomial <var>a</var><sub><var>n</var></sub>,<var>a</var><sub><var>n</var>-1</sub>,...<var>a</var><sub>1</sub>,<var>a</var><sub>0</sub>
				4157	</pre>
				4158
				4159	<p>will invoke a polynomial function given by</p>
				4160
				4161	<pre>
				4162	<var>a</var><sub><var>n</var></sub> <b><var>u</var></b><sup><var>n</var></sup> + <var>a</var><sub><var>n</var>-1</sub> <b><var>u</var></b><sup><var>n</var>-1</sup> + ··· <var>a</var><sub>1</sub> <b><var>u</var></b> + <var>a</var><sub>0</sub>,
				4163	</pre>
				4164
				4165	<p>where <b><var>u</var></b> is pixel's original normalized channel value.</p>
				4166
				4167	<p>The <code>Polynomial</code> function can be used in place of <code>Set</code>
				4168	(the <var>constant</var> polynomial) and <code>Add</code>, <code>Divide</code>,
				4169	<code>Multiply</code>, and <code>Subtract</code> (some <var>linear</var>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4170	polynomials) of the <a href="command-line-options.html#evaluate">-evaluate</a> operator. The <a
				4171	href="command-line-options.html#level">-level</a> operator also affects channels linearly. Some
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4172	correspondences follow.</p>
				4173
				4174	<table class="table table-condensed table-striped">
				4175	<tr>
				4176	<td>-evaluate Set <var>value</var> </td>
				4177	<td>-function Polynomial <var>value</var></td>
				4178	<td>(Constant functions; set <var>value</var>×100% gray when channels are RGB.)</td>
				4179	</tr>
				4180	<tr>
				4181	<td>-evaluate Add <var>value</var> </td>
				4182	<td>-function Polynomial 1,<var>value</var></td>
				4183	</tr>
				4184	<tr>
				4185	<td>-evaluate Subtract <var>value</var> </td>
				4186	<td>-function Polynomial 1,−<var>value</var></td>
				4187	</tr>
				4188	<tr>
				4189	<td>-evaluate Multiply <var>value</var> </td>
				4190	<td>-function Polynomial <var>value</var>,0</td>
				4191	</tr>
				4192	<tr>
				4193	<td>+level black% x white%</td>
				4194	<td>-function Polynomial A,B</td>
				4195	<td>(Reduce contrast. Here, A=(white-black)/100 and B=black/100.)</td>
				4196	</tr>
				4197	</table>
				4198
				4199	<p>The <code>Polynomial</code> function gives great versatility, since
				4200	polynomials can be used to fit any continuous curve to any degree of accuracy
				4201	desired.</p>
				4202
				4203	</dd>
				4204	<dt>Sinusoid</dt>
				4205	<dd>
				4206	<p>The <code>Sinusoid</code> function can be used to vary the channel values
				4207	sinusoidally by setting frequency, phase shift, amplitude, and a bias. These
				4208	values are given as one to four parameters, as follows,</p>
				4209
				4210	<pre>
				4211	-function <code>Sinusoid</code> <var>freq</var>,[<var>phase</var>,[<var>amp</var>,[<var>bias</var>]]]
				4212	</pre>
				4213
				4214	<p>where <var>phase</var> is in degrees. (The domain [0,1] of the function
				4215	corresponds to 0 through <var>freq</var>×360 degrees.)
				4216	The result is that if a pixel's normalized channel value is originally
				4217	<b><var>u</var></b>, its resulting normalized value is given by </p>
				4218
				4219	<pre>
				4220	<var>amp</var> * sin(2π (<var>freq</var> * <b><var>u</var></b> + <var>phase</var> / 360)) + <var>bias</var>
				4221	</pre>
				4222
				4223	<p> For example, the following generates a curve that starts and ends at 0.9
				4224	(when <b><var>u</var></b>=0 and 1, resp.), oscillating three times between
				4225	.7−.2=.5 and .7+.2=.9. </p>
				4226
				4227	<pre>
				4228	-function Sinusoid 3,-90,.2,.7
				4229	</pre>
				4230
				4231	<p>The default values of <var>amp</var> and <var>bias</var> are both .5. The default for <var>phase</var>
				4232	is 0.</p>
				4233
				4234	<p>The <code>Sinusoid</code> function generalizes <code>Sin</code> and
				4235	<code>Cos</code> of the <a href="command-line-options.html#evaluate">-evaluate</a> operator by allowing
				4236	varying amplitude, phase and bias. The correspondence is as follows.</p>
				4237
				4238	<table class="table table-condensed table-striped">
				4239	<tr>
				4240	<td>-evaluate Sin <var>freq</var> </td>
				4241	<td>-function Sinusoid <var>freq</var>,0 </td>
				4242	</tr>
				4243	<tr>
				4244	<td>-evaluate Cos <var>freq</var> </td>
				4245	<td>-function Sinusoid <var>freq</var>,90 </td>
				4246	</tr>
				4247	</table>
				4248	</dd>
				4249	<dt>ArcSin</dt>
				4250	<dd>
				4251	<p>The <code>ArcSin</code> function generates the inverse curve of a Sinusoid,
				4252	and can be used to generate cylindrical distortion and displacement maps.
				4253	The curve can be adjusted relative to both the input values and output range
				4254	of values.</p>
				4255
				4256	<pre>
				4257	-function <code>ArcSin</code> <var>width</var>,[<var>center</var>,[<var>range</var>,[<var>bias</var>]]]
				4258	</pre>
				4259
				4260	<p>with all values given in terms of normalized color values (0.0 for black,
				4261	1.0 for white). Defaulting to values covering the full range from 0.0 to 1.0
				4262	for bout input (<var>width</var>), and output (<var>width</var>) values. '<code>1.0,0.5,1.0,0.5</code>' </p>
				4263
				4264	<pre>
				4265	<var>range</var>/π * asin( 2/<var>width</var> * ( <b><var>u</var></b> - <var>center</var> ) ) + <var>bias</var>
				4266	</pre>
				4267
				4268	</dd>
				4269	<dt>ArcTan</dt>
				4270	<dd>
				4271	<p>The <code>ArcTan</code> function generates a curve that smooth crosses from
				4272	limit values at infinities, though a center using the given slope value.
				4273	All these values can be adjusted via the arguments.</p>
				4274
				4275	<pre>
				4276	-function <code>ArcTan</code> <var>slope</var>,[<var>center</var>,[<var>range</var>,[<var>bias</var>]]]
				4277	</pre>
				4278
				4279	<p>Defaulting to '<code>1.0,0.5,1.0,0.5</code>'.
				4280	</p>
				4281
				4282	<pre>
				4283	<var>range</var>/π * atan( <var>slope</var>π ( <b><var>u</var></b> - <var>center</var> ) ) + <var>bias</var>
				4284	</pre>
				4285	</dd>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4286	</tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4287	</dl>
				4288
				4289
				4290
				4291	<div style="margin: auto;">
				4292	<h3 class="magick-header"><a id="fuzz"></a>-fuzz <var>distance</var>{<var>%</var>}</h3>
				4293	</div>
				4294
				4295	<p class="magick-description">Colors within this <var>distance</var> are considered equal.</p>
				4296
				4297	<p>A number of algorithms search for a target color. By default the color must
				4298	be exact. Use this option to match colors that are close to the target color
				4299	in RGB space. For example, if you want to automagically trim the edges of an
				4300	image with <a href="command-line-options.html#trim">-trim</a> but the image was scanned and the target
				4301	background color may differ by a small amount. This option can account for
				4302	these differences.</p>
				4303
				4304	<p>The <var>distance</var> can be in absolute intensity units or, by
				4305	appending <code>%</code> as a percentage of the maximum possible intensity (255,
				4306	65535, or 4294967295).</p>
				4307
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4308	<p>Use <a href="command-line-options.html#fuzz" >+fuzz</a> to reset the fuzz value to 0.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4309
				4310
				4311	<div style="margin: auto;">
				4312	<h3 class="magick-header"><a id="fx"></a>-fx <var>expression</var></h3>
				4313	</div>
				4314
				4315	<p class="magick-description">apply a mathematical expression to an image or image channels.</p>
				4316
				4317	<p>If the first character of <var>expression</var> is <code>@</code>,
				4318	the expression is read from a file titled by the remaining characters in the
				4319	string.</p>
				4320
				4321	<p>See <a href="fx.html">FX,
				4322	The Special Effects Image Operator</a> for a detailed discussion of this
				4323	option.</p>
				4324
				4325
				4326	<div style="margin: auto;">
				4327	<h3 class="magick-header"><a id="gamma"></a>-gamma <var>value</var></h3>
				4328	</div>
				4329
				4330	<p class="magick-description">level of gamma correction.</p>
				4331
				4332	<p>The same color image displayed on two different workstations may look
				4333	different due to differences in the display monitor. Use gamma correction to
				4334	adjust for this color difference. Reasonable values extend from
				4335	<code>0.8</code> to <code>2.3</code>. Gamma less than 1.0 darkens the image and
				4336	gamma greater than 1.0 lightens it. Large adjustments to image gamma may
				4337	result in the loss of some image information if the pixel quantum size is only
				4338	eight bits (quantum range 0 to 255).</p>
				4339
				4340	<p>Gamma adjusts the image's channel values pixel-by-pixel according to
				4341	a power law, namely, pow(pixel,1/gamma) or pixel^(1/gamma), where pixel is the
				4342	normalized or 0 to 1 color value. For example, using a value of gamma=2 is the
				4343	same as taking the square root of the image.</p>
				4344
				4345	<p>You can apply separate gamma values to the red, green, and blue channels of
				4346	the image with a gamma value list delimited with commas (e.g.,
				4347	<code>1.7,2.3,1.2</code>).</p>
				4348
				4349	<p>Use <a href="command-line-options.html#gamma">+gamma <var>value</var></a> to set the
				4350	image gamma level without actually adjusting the image pixels. This option
				4351	is useful if the image is of a known gamma but not set as an image attribute
				4352	(e.g. PNG images). Write the "file gamma" which is the reciprocal of the
				4353	display gamma; e.g., if your image is sRGB and you want to write a PNG gAMA
				4354	chunk, use</p>
				4355
				4356	<pre>
				4357	convert input.png +gamma .45455 output.png
				4358	</pre>
				4359
				4360	<p>(0.45455 is 1/2.2)</p>
				4361
				4362	<p>Note that gamma adjustments are also available via the <a href="command-line-options.html#level">-level</a> operator.</p>
				4363
				4364	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4365	<h3 class="magick-header"><a id="gaussian-blur"></a>-gaussian-blur <var>radius</var><br />-gaussian-blur <var>radius</var>x<var>sigma</var></h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4366	</div>
				4367
				4368	<p class="magick-description">Blur the image with a Gaussian operator.</p>
				4369
				4370	<p>Convolve the image with a Gaussian or normal distribution using the given
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4371	<var >Sigma</var> value. The formula is:</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4372
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4373	<p class="text-center"><img class="img-thumbnail" alt="gaussian distribution" width="243px" height="42px" src="../images/gaussian-blur.png"/> </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4374
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4375	<p>The <var >Sigma</var> value is the important argument, and
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4376	determines the actual amount of blurring that will take place. </p>
				4377
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4378	<p>The <var >Radius</var> is only used to determine the size of the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4379	array which will hold the calculated Gaussian distribution. It should be an
				4380	integer. If not given, or set to zero, IM will calculate the largest possible
				4381	radius that will provide meaningful results for the Gaussian distribution.
				4382	</p>
				4383
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4384	<p>The larger the <var >Radius</var> the radius the slower the
				4385	operation is. However too small a <var >Radius</var>, and sever
				4386	aliasing effects may result. As a guideline, <var >Radius</var>
				4387	should be at least twice the <var >Sigma</var> value, though three
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4388	times will produce a more accurate result. </p>
				4389
				4390	<p>This differs from the faster <a href="command-line-options.html#blur">-blur</a> operator in that a
				4391	full 2-dimensional convolution is used to generate the weighted average of the
				4392	neighboring pixels. </p>
				4393
				4394	<p>The <a href="command-line-options.html#virtual-pixel">-virtual-pixel</a> setting will determine how
				4395	pixels which are outside the image proper are blurred into the final result.
				4396	</p>
				4397
				4398
				4399	<div style="margin: auto;">
				4400	<h3 class="magick-header"><a id="geometry"></a>-geometry <var>geometry</var></h3>
				4401	</div>
				4402
				4403	<p class="magick-description">Set the preferred size and location of the image.</p>
				4404
				4405	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				4406
				4407	<div style="margin: auto;">
				4408	<h3 class="magick-header"><a id="gravity"></a>-gravity <var>type</var></h3>
				4409	</div>
				4410
				4411	<p class="magick-description">Sets the current gravity suggestion for various other settings and options.</p>
				4412
				4413	<p>Choices include: <code>NorthWest</code>, <code>North</code>,
				4414	<code>NorthEast</code>, <code>West</code>, <code>Center</code>, <code>East</code>,
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4415	<code>SouthWest</code>, <code>South</code>, <code>SouthEast</code>. Use <a
				4416	href="command-line-options.html#list">-list gravity</a> to get a complete list of <a
				4417	href="command-line-options.html#gravity">-gravity</a> settings available in your ImageMagick
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4418	installation.</p>
				4419
				4420	<p>The direction you choose specifies where to position text or subimages. For
				4421	example, a gravity of <code>Center</code> forces the text to be centered within
Cristy	776113a	2016-04-29 12:01:19 -0400	[diff] [blame]	4422	the image. By default, the image gravity is <code>undefined</code>. See <a
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4423	href="command-line-options.html#draw">-draw</a> for more details about graphic primitives. Only the
				4424	text primitive of <a href="command-line-options.html#draw">-draw</a> is affected by the <a
				4425	href="command-line-options.html#gravity">-gravity</a> option.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4426
				4427	<p>The <a href="command-line-options.html#gravity">-gravity</a> option is also used in concert with the
				4428	<a href="command-line-options.html#geometry">-geometry</a> setting and other settings or options that
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4429	take <var>geometry</var> as an argument, such as the <a
				4430	href="command-line-options.html#crop">-crop</a> option. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4431
				4432	<p>If a <a href="command-line-options.html#gravity">-gravity</a> setting occurs before another option
				4433	or setting having a <var>geometry</var> argument that specifies an
				4434	offset, the offset is usually applied to the point within the image suggested
				4435	by the <a href="command-line-options.html#gravity">-gravity</a> argument. Thus, in the following
				4436	command, for example, suppose the file <code>image.png</code> has dimensions
				4437	200x100. The offset specified by the argument to <a href="command-line-options.html#region">-region</a>
				4438	is (−40,+20). The argument to <a href="command-line-options.html#gravity">-gravity</a> is
				4439	<code>Center</code>, which suggests the midpoint of the image, at the point
				4440	(100,50). The offset (−40,20) is applied to that point, giving
				4441	(100−40,50+20)=(60,70), so the specified 10x10 region is located at
				4442	that point. (In addition, the <a href="command-line-options.html#gravity">-gravity</a> affects the
				4443	region itself, which is <var>centered</var> at the pixel
				4444	coordinate (60,70). (See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.)</p>
				4445
				4446	<pre>
				4447	convert image.png -gravity Center -region 10x10-40+20 \
				4448	-negate output.png
				4449	</pre>
				4450
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4451	<p>When used as an option to <a href="composite.html">composite</a>, <a
				4452	href="command-line-options.html#gravity">-gravity</a> gives the direction that the image gravitates
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4453	within the composite.</p>
				4454
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4455	<p>When used as an option to <a href="montage.html">montage</a>, <a
				4456	href="command-line-options.html#gravity">-gravity</a> gives the direction that an image gravitates
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4457	within a tile. The default gravity is <code>Center</code> for this purpose.</p>
				4458
				4459
				4460	<div style="margin: auto;">
				4461	<h3 class="magick-header"><a id="grayscale"></a>-grayscale <var>method</var></h3>
				4462	</div>
				4463
				4464	<p class="magick-description">convert image to grayscale.</p>
				4465
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4466	<p>This will use one of the <a href="command-line-options.html#intensity" >-intensity</a> methods to
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4467	convert the given image into a linear-grayscale image. </p>
				4468
				4469	<p>For example, to convert an image to (linear) Rec709Luminance grayscale, type:</p>
				4470
				4471	<pre>
				4472	convert in.png -grayscale Rec709Luminance out.png
				4473	</pre>
				4474
				4475	<p>which is equivalent to:</p>
				4476
				4477	<pre>
				4478	convert in.png -colorspace gray out.png
				4479	</pre>
				4480
				4481	<p>Similarly, to convert an image to (non-linear) Rec709Luma grayscale, type:</p>
				4482
				4483	<pre>
				4484	convert in.png -grayscale Rec709Luma out.png
				4485	</pre>
				4486
				4487	<p>which is equivalent to:</p>
				4488
				4489	<pre>
				4490	convert in.png -set colorspace RGB -colorspace gray out.png
				4491	</pre>
				4492
				4493	<p>Note that a 'colorspace' intensity method will produce the same result
				4494	regardless of the current colorpsace of the image. But a 'mathematical'
				4495	intensity method will depend on the current colorspace the image is currently
				4496	using. </p>
				4497
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4498	<p>While this operation uses an <a href="command-line-options.html#intensity" >-intensity</a> method,
				4499	it does not use or set the <a href="command-line-options.html#intensity" >-intensity</a> setting, so
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4500	will not effect other operations that may use that setting.</p>
				4501
				4502
				4503	<div style="margin: auto;">
				4504	<h3 class="magick-header"><a id="green-primary"></a>-green-primary <var>x,y</var></h3>
				4505	</div>
				4506
				4507	<p class="magick-description">green chromaticity primary point.</p>
				4508
				4509
				4510	<div style="margin: auto;">
				4511	<h3 class="magick-header"><a id="hald-clut"></a>-hald-clut</h3>
				4512	</div>
				4513
				4514	<p class="magick-description">apply a Hald color lookup table to the image.</p>
				4515
				4516	<p>A Hald color lookup table is a 3-dimensional color cube mapped to 2
				4517	dimensions. Create it with the <code>HALD:</code> prefix (e.g. HALD:8). You
				4518	can apply any color transformation to the Hald image and then use this option
				4519	to apply the transform to the image. </p>
				4520
				4521	<pre>
				4522	convert image.png hald.png -hald-clut transform.png
				4523	</pre>
				4524
				4525	<p>This option provides a convenient method for you to use Gimp or Photoshop
				4526	to make color corrections to the Hald CLUT image and subsequently apply them
				4527	to multiple images using an ImageMagick script. </p>
				4528
				4529	<p>Note that the representation is only of the normal RGB color space and that
				4530	the whole color value triplet is used for the interpolated lookup of the
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4531	represented Hald color cube image. Because of this the operation is not <a
				4532	href="command-line-options.html#channel" >-channel</a> setting effected, nor can it adjust or modify an
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4533	images transparency or alpha/matte channel.</p>
				4534
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4535	<p>See also <a href="command-line-options.html#clut" >-clut</a> which provides color value replacement
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	4536	of the individual color channels, usually involving a simpler grayscale
				4537	image. E.g: grayscale to color replacement, or modification by a histogram
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4538	mapping. </p>
				4539
				4540
				4541	<div style="margin: auto;">
				4542	<h3 class="magick-header"><a id="help"></a>-help</h3>
				4543	</div>
				4544
				4545	<p class="magick-description">print usage instructions.</p>
				4546
				4547	<div style="margin: auto;">
				4548	<h3 class="magick-header"><a id="highlight-color"></a>-highlight-color <var>color</var></h3>
				4549	</div>
				4550
				4551	<p class="magick-description">when comparing images, emphasize pixel differences with this color.</p>
				4552
				4553	<div style="margin: auto;">
				4554	<h3 class="magick-header"><a id="hough-lines"></a>-hough-lines <var>width</var>x<var>height</var>{<var>+threshold</var>}</h3>
				4555	</div>
				4556
				4557	<p class="magick-description">identify straight lines in the image (e.g. -hough-lines 9x9+195).</p>
				4558
				4559	<p>Use the Hough line detector with any binary edge extracted image to locate and draw any straight lines that it finds.</p>
				4560
				4561	<p>The process accumulates counts for every white pixel in the binary edge image for every possible orientation (for angles from 0 to 179 in 1 deg increments) and distance from the center of the image to the corners (in 1 px increments). It stores the counts in an accumulator matrix of angle vs distance. The size of the accumulator will be 180x(diagonal/2). Next it searches the accumulator for peaks in counts and converts the locations of the peaks to slope and intercept in the normal x,y input image space. The algorithm uses slope/intercepts to find the endpoints clipped to the bounds of the image. The lines are drawn from the given endpoints. The counts are a measure of the length of the lines.</p>.
				4562
				4563	<p>The WxH arguments specify the filter size for locating the peaks in the Hough accumulator. The threshold excludes lines whose counts are less than the threshold value.</p>
				4564
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4565	<p>Use <code><a href="command-line-options.html#background" >-background</a></code> to specify the color of the background onto which the lines will be drawn. The default is black.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4566
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4567	<p>Use <code><a href="command-line-options.html#fill" >-fill</a></code> to specify the color of the lines. The default is black.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4568
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4569	<p>Use <code><a href="command-line-options.html#stroke" >-stroke</a></code> and <code><a href="command-line-options.html#strokewidth" >-strokewidth</a></code> to specify the thickness of the lines. The default is black and no strokewidth.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4570
				4571	<p>A text file listing the endpoints and counts may be created by using the suffix, .mvg, for the output image.</p>
				4572
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4573	<p>Use <code><a href="command-line-options.html#define" >-define</a> hough-lines:accumulator=true</code> to return the accumulator image in addition to the lines image.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4574
				4575	<div style="margin: auto;">
				4576	<h3 class="magick-header"><a id="iconGeometry"></a>-iconGeometry <var>geometry</var></h3>
				4577	</div>
				4578
				4579	<p class="magick-description">specify the icon geometry.</p>
				4580
				4581	<p>Offsets, if present in the geometry specification, are handled in the same
				4582	manner as the <a href="command-line-options.html#geometry">-geometry</a> option, using X11 style to
				4583	handle negative offsets.</p>
				4584
				4585	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				4586
				4587	<div style="margin: auto;">
				4588	<h3 class="magick-header"><a id="iconic"></a>-iconic</h3>
				4589	</div>
				4590
				4591	<p class="magick-description">start in icon mode in X Windows", 'animate', 'display</p>
				4592
				4593	<div style="margin: auto;">
				4594	<h3 class="magick-header"><a id="identify"></a>-identify</h3>
				4595	</div>
				4596
				4597	<p class="magick-description">identify the format and characteristics of the image.</p>
				4598
				4599	<p>This information is printed: image scene number; image name; image size;
				4600	the image class (<var>DirectClass</var> or <var>PseudoClass</var>); the total number of unique colors; and the
				4601	number of seconds to read and transform the image. Refer to <a href="miff.html">MIFF</a> for
				4602	a description of the image class.</p>
				4603
				4604	<p>If <a href="command-line-options.html#colors">-colors</a> is also specified, the total unique colors
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4605	in the image and color reduction error values are printed. Refer to <a
				4606	href="quantize.html">color
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4607	reduction algorithm</a> for a description of these values.</p>
				4608
				4609	<p>If <a href="command-line-options.html#verbose">-verbose</a> precedes this option, copious
				4610	amounts of image properties are displayed including image statistics, profiles,
				4611	image histogram, and others.</p>
				4612
				4613	<div style="margin: auto;">
				4614	<h3 class="magick-header"><a id="ift"></a>-ift</h3>
				4615	</div>
				4616
				4617	<p class="magick-description">implements the inverse discrete Fourier transform (DFT).</p>
				4618
				4619	<p>This option is new as of ImageMagick 6.5.4-3 (and now working for Windows
				4620	users in ImageMagick 6.6.0-9). It transforms a pair of magnitude and phase
				4621	images from the frequency domain to a single image in the normal or spatial
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4622	domain. See for example, <a
				4623	href="http://en.wikipedia.org/wiki/Fourier_transform">Fourier Transform</a>,
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4624	<a href="http://en.wikipedia.org/wiki/DFT">Discrete Fourier Transform</a> and
				4625	<a href="http://en.wikipedia.org/wiki/FFT">Fast Fourier Transform</a>.</p>
				4626
				4627	<p>For example, depending upon the image format used to store the result of
				4628	the <a href="command-line-options.html#fft">-fft</a>, one would use either</p>
				4629
				4630	<pre>
				4631	convert fft_image.miff -ift fft_image_ift.png
				4632	</pre>
				4633
				4634	<p>or</p>
				4635
				4636	<pre>
				4637	convert fft_image-0.png fft_image-1.png -ift fft_image_ift.png
				4638	</pre>
				4639
				4640	<p>The resulting image may need to be cropped due to padding introduced when
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4641	the original image, prior to the <a href="command-line-options.html#fft">-fft</a> or <a
				4642	href="command-line-options.html#fft">+fft</a>, was not square or even dimensioned. Any padding is at
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4643	the right and/or bottom sides of the image.</p>
				4644
				4645	<p>The <a href="http://www.fftw.org/">FFTW</a> delegate library is required to
				4646	use <a href="command-line-options.html#ift">-ift</a>.</p>
				4647
				4648	<p>Use <a href="command-line-options.html#ift">+ift</a> (with HDRI enabled) to transform a pair of real
				4649	and imaginary images from the frequency domain to a single image in the normal
				4650	(spatial) domain.</p>
				4651
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4652	<p>By default the IFT is not normalized (and the FFT is). Use "<code><a href="command-line-options.html#define" >-define</a> fourier:normalize=inverse</code> to explicitly normalize the IFT and unnormalize the FFT.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4653
				4654	<div style="margin: auto;">
				4655	<h3 class="magick-header"><a id="immutable"></a>-immutable</h3>
				4656	</div>
				4657
				4658	<p class="magick-description">make image immutable.</p>
				4659
				4660	<div style="margin: auto;">
				4661	<h3 class="magick-header"><a id="implode"></a>-implode <var>factor</var></h3>
				4662	</div>
				4663
				4664	<p class="magick-description">implode image pixels about the center.</p>
				4665
				4666	<div style="margin: auto;">
				4667	<h3 class="magick-header"><a id="insert"></a>-insert <var>index</var></h3>
				4668	</div>
				4669
				4670	<p class="magick-description">insert the last image into the image sequence.</p>
				4671
				4672	<p>This option takes last image in the current image sequence and inserts it
				4673	at the given index. If a negative index is used, the insert position is
				4674	calculated before the last image is removed from the sequence. As such
				4675	<code>-insert -1</code> will result in no change to the image sequence.</p>
				4676
				4677	<p>The <code>+insert</code> option is equivalent to <code>-insert -1</code>. In
				4678	other words, insert the last image, at the end of the current image sequence.
				4679	Consequently this has no effect on the image sequence order.</p>
				4680
				4681	<div style="margin: auto;">
				4682	<h3 class="magick-header"><a id="intensity"></a>-intensity <var>method</var></h3>
				4683	</div>
				4684
				4685	<p class="magick-description">method to generate intensity value from pixel.</p>
				4686
				4687	<p>ImageMagick provides a number of methods used in situations where an
				4688	operator needs to determine a single grayscale value for some purpose, from
				4689	an image with red, green, and blue pixel components. Typically the linear
				4690	<code>Rec709Luminance</code> formula is used, which is the same formula used when
				4691	converting images to <code>-colorspace gray</code>. </p>
				4692
				4693	<p>The following formulas are currently provided, and will first convert
				4694	the pixel values to linear-RGB or non-linear sRGB colorspace before
				4695	being applied to calculate the final greyscale value. </p>
				4696
				4697	<dl class="dl-horizontal">
				4698	<dt>Rec601Luma</dt><dd> 0.298839R' + 0.586811G'+ 0.114350B'</dd>
				4699	<dt>Rec601Luminance</dt><dd> 0.298839R + 0.586811G + 0.114350B</dd>
				4700	<dt>Rec709Luma</dt><dd> 0.212656R' + 0.715158G' + 0.072186B'</dd>
				4701	<dt>Rec709Luminance</dt><dd> 0.212656R + 0.715158G + 0.072186B</dd>
				4702	<dt>Brightness</dt><dd> max(R', G', B')</dd>
				4703	<dt>Lightness</dt><dd> (min(R', G', B') + max(R', G', B')) / 2.0</dd>
				4704	</dl>
				4705
				4706	<p>Note that the above R,G,B values is the image's linear-RGB values, while
				4707	R',G',B' are sRGB non-linear values. </p>
				4708
				4709	<p>These intensity methods are mathematical in nature and will use the
				4710	current value in the images respective R,G,B channel regardless of
				4711	what that is, or what colorspace the image is currently using.</p>
				4712
				4713	<dl class="dl-horizontal">
				4714	<dt>Average</dt><dd>(R + G + B) / 3.0</dd>
				4715	<dt>MS</dt><dd>(R^2 + G^2 + B^2) / 3.0</dd>
				4716	<dt>RMS</dt><dd>sqrt( (R^2 + G^2 + B^2) / 3.0 )</dd>
				4717	</dl>
				4718
				4719	<p>These methods are often used for other purposes, such as generating a
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4720	grayscale difference image between two color images (using <a href="command-line-options.html#compose"
				4721	>-compose</a> '<code>Difference</code>' composition. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4722
				4723	<p> For example The 'MS' (Mean Squared) setting is good for minimizing color
				4724	error comparisions. While... The method 'RMS' (Root Mean Squared) for
				4725	example is appropriate for calculating color vector distance, from a color
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4726	difference image. This is equivalent to the color only component of the <a
				4727	href="command-line-options.html#fuzz" >-fuzz</a> factor color compare setting. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4728
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4729	<p>See also <a href="command-line-options.html#grayscale" >-grayscale</a> which applies one of the above
				4730	grayscaling formula directly to an image without setting the <a
				4731	href="command-line-options.html#intensity" >-intensity</a> setting.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4732
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4733	<p>The <a href="command-line-options.html#colorspace" >-colorspace gray</a> image conversion also uses
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4734	the current intensity setting, but will always convert the image to the
				4735	appropriate sRGB or linear-RGB colorspace before appling the above
				4736	function.</p>
				4737
				4738	<p>To print a complete list of possible pixel intensity setting methods, use <a href="command-line-options.html#list">-list intensity</a>.</p>
				4739
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4740	<p>Operators affected by the <a href="command-line-options.html#intensity" >-intensity</a> setting include:</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4741
				4742	<pre>
				4743	-adaptive-blur
				4744	-adaptive-sharpen
				4745	-black-threshold
				4746	-clut (when mapping greyscale CLUT image to alpha channel if set by -channels)
				4747	-colors for gray colorspace
				4748	-compose {LightenIntensity, DarkenIntensity, CopyOpacity, CopyBlack}
				4749	-contrast-stretch
				4750	-distort {ErodeIntensity, DilateIntensity}
				4751	-normalize
				4752	-random-threshold
				4753	-selective-blur
				4754	-shade
				4755	-threshold
				4756	-tint
				4757	-white-threshold
				4758	</pre>
				4759
				4760	<div style="margin: auto;">
				4761	<h3 class="magick-header"><a id="intent"></a>-intent <var>type</var></h3>
				4762	</div>
				4763
				4764	<p class="magick-description">use this type of rendering intent when managing the image color.</p>
				4765
				4766	<p>Use this option to affect the color management operation of an image (see
				4767	<a href="command-line-options.html#profile">-profile</a>). Choose from these intents: <code>Absolute,
				4768	Perceptual, Relative, Saturation</code>.</p>
				4769
				4770	<p>The default intent is Perceptual for the sRGB colorspace and undefined for the RGB and gray colorspaces.</p>
				4771
				4772	<p>To print a complete list of rendering intents, use <a href="command-line-options.html#list">-list intent</a>.</p>
				4773
				4774	<div style="margin: auto;">
				4775	<h3 class="magick-header"><a id="interlace"></a>-interlace <var>type</var></h3>
				4776	</div>
				4777
				4778	<p class="magick-description">the type of interlacing scheme.</p>
				4779
				4780	<p>Choose from:</p>
				4781
				4782	<pre>
				4783	none
				4784	line
				4785	plane
				4786	partition
				4787	JPEG
				4788	GIF
				4789	PNG
				4790	</pre>
				4791
				4792	<p>This option is used to specify the type of interlacing scheme for raw image
				4793	formats such as <code>RGB</code> or <code>YUV</code>.</p>
				4794
				4795	<p><code>None</code> means do not interlace (RGBRGBRGBRGBRGBRGB...),</p>
				4796
				4797	<p><code>Line</code> uses scanline interlacing (RRR...GGG...BBB...RRR...GGG...BBB...), and.</p>
				4798
				4799	<p><code>Plane</code> uses plane interlacing (RRRRRR...GGGGGG...BBBBBB...).</p>
				4800
				4801	<p><code>Partition</code> is like plane except the different planes are saved to
				4802	individual files (e.g. image.R, image.G, and image.B).</p>
				4803
				4804	<p>Use <code>Line</code> or <code>Plane</code> to create an <code>interlaced
				4805	PNG</code> or <code>GIF</code> or <code>progressive JPEG</code> image.</p>
				4806
				4807	<p>To print a complete list of interlacing schemes, use <a href="command-line-options.html#list">-list
				4808	interlace</a>.</p>
				4809
				4810	<div style="margin: auto;">
				4811	<h3 class="magick-header"><a id="interpolate"></a>-interpolate <var>type</var></h3>
				4812	</div>
				4813
				4814	<p class="magick-description">Set the pixel color interpolation method to use when looking up a color based on a floating point or real value.</p>
				4815
				4816	<p>When looking up the color of a pixel using a non-integer floating point
				4817	value, you typically fall in between the pixel colors defined by the source
				4818	image. This setting determines how the color is determined from the colors of
				4819	the pixels surrounding that point. That is how to determine the color of a
				4820	point that falls between two, or even four different colored pixels. </p>
				4821
				4822	<dl class="dl-horizontal">
				4823	<dt>integer</dt>
				4824	<dd>The color of the top-left pixel (floor function)</dd>
				4825	<dt>nearest-neighbor</dt>
				4826	<dd>The nearest pixel to the lookup point (rounded function)</dd>
				4827	<dt>average</dt>
				4828	<dd>The average color of the surrounding four pixels</dd>
				4829	<dt>bilinear</dt>
				4830	<dd>A double linear interpolation of pixels (the default)</dd>
				4831	<dt>mesh</dt>
				4832	<dd>Divide area into two flat triangular interpolations</dd>
				4833	<dt>bicubic</dt>
				4834	<dd>Fitted bicubic-spines of surrounding 16 pixels</dd>
				4835	<dt>spline</dt>
				4836	<dd>Direct spline curves (colors are blurred)</dd>
				4837	<dt>filter</dt>
				4838	<dd>Use resize <a href="command-line-options.html#filter">-filter</a> settings</dd>
				4839	</dl>
				4840
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4841	<p>This most important for distortion operators such as <a href="command-line-options.html#distort"
				4842	>-distort</a>, <a href="command-line-options.html#implode" >-implode</a>, <a href="command-line-options.html#transform"
				4843	>-transform</a> and <a href="command-line-options.html#fx" >-fx</a>. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4844
				4845	<p>To print a complete list of interpolation methods, use <a href="command-line-options.html#list">-list interpolate</a>.</p>
				4846
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4847	<p>See also <a href="command-line-options.html#virtual-pixel" >-virtual-pixel</a>, for control of the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4848	lookup for positions outside the boundaries of the image. </p>
				4849
				4850
				4851	<div style="margin: auto;">
				4852	<h3 class="magick-header"><a id="interline-spacing"></a>-interline-spacing <var>value</var></h3>
				4853	</div>
				4854
				4855	<p class="magick-description">the space between two text lines.</p>
				4856
				4857	<div style="margin: auto;">
				4858	<h3 class="magick-header"><a id="interword-spacing"></a>-interword-spacing <var>value</var></h3>
				4859	</div>
				4860
				4861	<p class="magick-description">the space between two words.</p>
				4862
				4863	<div style="margin: auto;">
				4864	<h3 class="magick-header"><a id="kerning"></a>-kerning <var>value</var></h3>
				4865	</div>
				4866
				4867	<p class="magick-description">the space between two letters.</p>
				4868
				4869	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4870	<h3 class="magick-header"><a id="kuwahara"></a>-kuwahara <var>radius</var><br />-kuwahara <var>radius</var>x<var>sigma</var></h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4871	</div>
				4872
				4873	<p class="magick-description">edge preserving noise reduction filter.</p>
				4874
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4875	<p>The <var >radius</var> is more important than the <var >sigma</var>. If <var >sigma</var> is left off, it will be computed automatically from the <var >radius</var> as <var >sigma</var>=<var >radius</var>-0.5. The <var >sigma</var> provides a bit of additional smoothing control.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4876
				4877
				4878	<div style="margin: auto;">
				4879	<h3 class="magick-header"><a id="label"></a>-label <var>name</var></h3>
				4880	</div>
				4881
				4882	<p class="magick-description">assign a label to an image.</p>
				4883
				4884	<p>Use this option to assign a specific label to the image, as it is read in
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4885	or created. You can use the <a href="command-line-options.html#set" >-set</a> operation to re-assign
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4886	a the labels of images already read in. Image formats such as TIFF, PNG,
				4887	MIFF, supports saving the label information with the image.</p>
				4888
				4889	<p>When saving an image to a <var>PostScript</var> file, any label
				4890	assigned to an image is used as a header string to print above the postscript
				4891	image. </p>
				4892
				4893	<p>You can include the image filename, type, width, height, or other image
				4894	attribute by embedding special format character. See <a href="escape.html">Format and Print Image
				4895	Properties</a> for details of the percent escape codes.</p>
				4896
				4897	<p>For example,</p>
				4898
				4899	<pre>
				4900	-label "%m:%f %wx%h" bird.miff
				4901	</pre>
				4902
				4903	<p>assigns an image label of <code>MIFF:bird.miff 512x480</code> to the
				4904	"<code>bird.miff</code>" image and whose width is 512 and height is 480, as it
				4905	is read in. If a <a href="command-line-options.html#label">+label</a> option was used instead, any
				4906	existing label present in the image would be used. You can remove all labels
				4907	from an image by assigning the empty string. </p>
				4908
				4909	<p>A label is not drawn on the image, but is embedded in the image datastream
				4910	via <var>Label</var> tag or similar mechanism. If you want the label to be
				4911	visible on the image itself, use the <a href="command-line-options.html#draw">-draw</a> option, or
				4912	during the final processing in the creation of an image montage.</p>
				4913
				4914	<p>If the first character of <var>string</var> is <var>@</var>, the image label is read from a file titled by the
				4915	remaining characters in the string. Labels in a file are literal, no embedded
				4916	formatting characters are recognized.</p>
				4917
				4918
				4919	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4920	<h3 class="magick-header"><a id="lat"></a>-lat <var>width</var><br />-lat <var>width</var>x<var>height</var>{<var>+-</var>}<var>offset</var>{<var>%</var>}</h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4921	</div>
				4922
				4923	<p class="magick-description">perform local adaptive threshold.</p>
				4924
				4925	<p>Adaptively threshold each pixel based on the value of pixels in a
				4926	surrounding window. If the current pixel is lighter than this average plus
				4927	the optional <code>offset</code>, then it is made white, otherwise it is made
				4928	black. Small variations in pixel values such as found in scanned documents
				4929	can be ignored if offset is positive. A negative offset will make it more
				4930	sensitive to those small variations. </p>
				4931
				4932	<p>This is commonly used to threshold images with an uneven background. It is
				4933	based on the assumption that average color of the small window is the
				4934	the local background color, from which to separate the foreground color. </p>
				4935
				4936
				4937	<div style="margin: auto;">
				4938	<h3 class="magick-header"><a id="layers"></a>-layers <var>method</var></h3>
				4939	</div>
				4940
				4941	<p class="magick-description">handle multiple images forming a set of image layers or animation frames.</p>
				4942
				4943	<p>Perform various image operation methods to a ordered sequence of images
				4944	which may represent either a set of overlaid 'image layers', a GIF disposal
				4945	animation, or a fully-'coalesced' animation sequence. </p>
				4946
				4947	<table class="table table-condensed table-striped">
				4948	<tbody>
				4949	<tr>
				4950	<th style="width: 8%">Method</th>
				4951	<th>Description</th>
				4952	</tr>
				4953
				4954	<tr>
				4955	<td>compare-any</td>
				4956	<td>Crop the second and later frames to the smallest rectangle
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4957	that contains all the differences between the two images. No GIF <a
				4958	href="command-line-options.html#dispose" >-dispose</a> methods are taken into account. </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4959	</tr>
				4960
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4961	<tr><td></td><td>This exactly the same as the <a href="command-line-options.html#deconstruct"
				4962	>-deconstruct</a> operator, and does not preserve animations normal
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4963	working, especially when animation used layer disposal methods such as
				4964	'<code>Previous</code>' or '<code>Background</code>'. </td>
				4965	</tr>
				4966
				4967	<tr>
				4968	<td>compare-clear</td>
				4969	<td>As '<code>compare-any</code>' but crop to the bounds of any
				4970	opaque pixels which become transparent in the second frame. That is the
				4971	smallest image needed to mask or erase pixels for the next frame. </td>
				4972	</tr>
				4973
				4974	<tr>
				4975	<td>compare-overlay</td>
				4976	<td>As '<code>compare-any</code>' but crop to pixels that add
				4977	extra color to the next image, as a result of overlaying color pixels.
				4978	That is the smallest single overlaid image to add or change colors. </td>
				4979	</tr>
				4980
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4981	<tr><td></td><td>This can be used with the <a href="command-line-options.html#compose" >-compose</a> alpha
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4982	composition method '<code>change-mask</code>', to reduce the image to
				4983	just the pixels that need to be overlaid. </td>
				4984	</tr>
				4985
				4986	<tr>
				4987	<td>coalesce</td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4988	<td>Equivalent to a call to the <a href="command-line-options.html#coalesce"
				4989	>-coalesce</a> operator. Apply the layer disposal methods set in the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4990	current image sequence to form a fully defined animation sequence, as
				4991	it should be displayed. Effectively converting a GIF animation into a
				4992	'film strip'-like animation. </td>
				4993	</tr>
				4994
				4995	<tr>
				4996	<td>composite</td>
				4997	<td>Alpha Composition of two image lists, separated by a
				4998	"<code>null:</code>" image, with the destination image list first, and
				4999	the source images last. An image from each list are composited
				5000	together until one list is finished. The separator image and source
				5001	image lists are removed. </td>
				5002	</tr>
				5003
				5004
				5005	<tr><td></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5006	<td>The <a href="command-line-options.html#geometry" >-geometry</a> offset is adjusted according
				5007	to <a href="command-line-options.html#gravity" >-gravity</a> in accordance of the virtual
				5008	canvas size of the first image in each list. Unlike a normal <a
				5009	href="command-line-options.html#composite" >-composite</a> operation, the canvas offset is also
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5010	added to the final composite positioning of each image. </td> </tr>
				5011
				5012	<tr><td></td>
				5013	<td>If one of the image lists only contains one image, that image is
				5014	applied to all the images in the other image list, regardless of which
				5015	list it is. In this case it is the image meta-data of the list which
				5016	preserved. </td>
				5017	</tr>
				5018
				5019
				5020	<tr>
				5021	<td>dispose</td>
				5022	<td>This like '<code>coalesce</code>' but shows the look of
				5023	the animation after the layer disposal method has been applied, before
				5024	the next sub-frame image is overlaid. That is the 'dispose' image that
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5025	results from the application of the GIF <a href="command-line-options.html#dispose"
				5026	>-dispose</a> method. This allows you to check what
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5027	is going wrong with a particular animation you may be developing.
				5028	</td>
				5029	</tr>
				5030
				5031	<tr>
				5032	<td>flatten</td>
				5033	<td>Create a canvas the size of the first images virtual
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5034	canvas using the current <a href="command-line-options.html#background" >-background</a> color,
				5035	and <a href="command-line-options.html#compose" >-compose</a> each image in turn onto that
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5036	canvas. Images falling outside that canvas is clipped. Final
				5037	image will have a zero virtual canvas offset. </td>
				5038	</tr>
				5039
				5040	<tr><td></td>
				5041	<td>This usually used as one of the final 'image layering' operations
				5042	overlaying all the prepared image layers into a final image. </td>
				5043	</tr>
				5044
				5045	<tr><td></td>
				5046	<td>For a single image this method can also be used to fillout a virtual
				5047	canvas with real pixels, or to underlay an opaque color to remove
				5048	transparency from an image.</td>
				5049	</tr>
				5050
				5051
				5052	<tr>
				5053	<td>merge</td>
				5054	<td>As 'flatten' method but merging all the given image
				5055	layers to create a new layer image just large enough to hold all the
				5056	image without clipping or extra space. The new images virtual offset
				5057	will preserve the position of the new layer, even if this offset is
				5058	negative. The virtual canvas size of the first image is preserved.
				5059	</td>
				5060	</tr>
				5061
				5062	<tr><td></td><td>Caution is advised when handling image layers with
				5063	negative offsets as few image file formats handle them correctly.
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5064	Following this operation method with <a href="command-line-options.html#repage" >+repage</a>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5065	will remove the layer offset, and create an image in which all the
				5066	overlaid image positions relative to each other is preserved, though
				5067	not necessarily exactly where you specified them.
				5068	</td>
				5069	</tr>
				5070
				5071	<tr><td></td><td>See also 'trim-bounds' below which is closely related but
				5072	without doing the'flatten' to merge the images together. </td>
				5073	</tr>
				5074
				5075	<tr>
				5076	<td>mosaic</td>
				5077	<td>As 'flatten' method but expanding the initial canvas size
				5078	of the first image in a positive direction only so as to hold all the
				5079	image layers. However as a virtual canvas is 'locked' to the origin,
				5080	by its own definition, image layers with a negative offsets will still
				5081	become clipped by the top and left edges. See 'merge' or 'trim-bounds'
				5082	if this could be a problem. </td>
				5083
				5084	</tr>
				5085
				5086	<tr><td></td><td>This method is commonly used to layout individual image
				5087	using various offset but without knowing the final canvas size. The
				5088	resulting image will, like 'flatten' not have any virtual offset, so
				5089	can be saved to any image file format. </td>
				5090	</tr>
				5091
				5092
				5093	<tr>
				5094	<td>optimize</td>
				5095	<td>Optimize a coalesced animation, into GIF animation using
				5096	a number of general techniques. This currently a short cut to
				5097	apply both the '<code>optimize-frame</code>', and
				5098	'<code>optimize-transparency</code>' methods but may be expanded to
				5099	include other optimization methods as they are developed. </td>
				5100	</tr>
				5101
				5102	<tr>
				5103	<td>optimize-frame</td>
				5104	<td>Optimize a coalesced animation, into GIF animation by
				5105	reducing the number of pixels per frame as much as possible by
				5106	attempting to pick the best layer disposal method to use, while ensuring
				5107	the result will continue to animate properly. </td>
				5108	</tr>
				5109
				5110	<tr><td></td><td> There is no guarantee that the best optimization is found.
				5111	But then no reasonably fast GIF optimization algorithm can do this.
				5112	However this does seem to do better than most other GIF frame
				5113	optimizers seen. </td>
				5114	</tr>
				5115
				5116	<tr>
				5117	<td>optimize-plus</td>
				5118	<td>As '<code>optimize-frame</code>' but attempt to improve the
				5119	overall optimization by adding extra frames to the animation, without
				5120	changing the final look or timing of the animation. The frames are
				5121	added to attempt to separate the clearing of pixels from the
				5122	overlaying of new additional pixels from one animation frame to the
				5123	next. If this does not improve the optimization (for the next frame
				5124	only), it will fall back to the results of the previous normal
				5125	'<code>optimize-frame</code>' technique. </td>
				5126	</tr>
				5127
				5128	<tr><td></td><td>There is the possibility that the change in the disposal
				5129	style will result in a worsening in the optimization of later frames,
				5130	though this is unlikely. In other words there no guarantee that it is
				5131	better than the normal '<code>optimize-frame</code>' technique. For some
				5132	animations however you can get a vast improvement in the final
				5133	animation size. </td>
				5134	</tr>
				5135
				5136	<tr>
				5137	<td>optimize-transparency</td>
				5138	<td>Given a GIF animation, replace any pixel in the sub-frame
				5139	overlay images with transparency, if it does not change the resulting
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5140	animation by more than the current <a href="command-line-options.html#fuzz" >-fuzz</a> factor.
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5141	</td>
				5142	</tr>
				5143
				5144	<tr><td></td><td>This should allow a existing frame optimized GIF animation
				5145	to compress into a smaller file size due to larger areas of one
				5146	(transparent) color rather than a pattern of multiple colors repeating
				5147	the current disposed image of the last frame. </td>
				5148	</tr>
				5149
				5150	<tr>
				5151	<td>remove-dups</td>
				5152	<td>Remove (and merge time delays) of duplicate consecutive
				5153	images, so as to simplify layer overlays of coalesced animations.
				5154	</td>
				5155	</tr>
				5156
				5157	<tr><td></td><td>Usually this a result of using a constant time delay
				5158	across the whole animation, or after a larger animation was split into
				5159	smaller sub-animations. The duplicate frames could also have been
				5160	used as part of some frame optimization methods. </td>
				5161	</tr>
				5162
				5163	<tr>
				5164	<td>remove-zero</td>
				5165	<td>Remove any image with a zero time delay, unless ALL the
				5166	images have a zero time delay (and is not a proper timed animation, a
				5167	warning is then issued). </td>
				5168	</tr>
				5169
				5170	<tr><td></td><td>In a GIF animation, such images are usually frames which
				5171	provide partial intermediary updates between the frames that are
				5172	actually displayed to users. These frames are usually added for
				5173	improved frame optimization in GIF animations. </td>
				5174	</tr>
				5175
				5176	<tr>
				5177	<td>trim-bounds</td>
				5178	<td>Find the bounds of all the images in the current
				5179	image sequence, then adjust the offsets so all images are contained on
				5180	a minimal positive canvas. None of the image data is modified or
				5181	merged, only the individual image virtual canvas size and offset.
				5182	All the images is given the same canvas size, and and will have
				5183	a positive offset, but will remain in the same position relative to
				5184	each other. As a result of the minimal canvas size at least one image
				5185	will touch every edge of that canvas. The image data touching those
				5186	edges however may be transparent. </td>
				5187	</tr>
				5188
				5189	<tr><td></td><td>The result is much like if you used 'merge' followed by a
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5190	<a href="command-line-options.html#repage" >+repage</a> option, except that all the images
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5191	have been kept separate. If 'flatten' is used after using
				5192	'trim-bounds' you will get the same result. </td>
				5193	</tr>
				5194
				5195	</tbody>
				5196	</table>
				5197
				5198	<p>To print a complete list of layer types, use <a href="command-line-options.html#list">-list layers</a>.</p>
				5199
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5200	<p>The operators <a href="command-line-options.html#coalesce" >-coalesce</a>, <a href="command-line-options.html#deconstruct"
				5201	>-deconstruct</a>, <a href="command-line-options.html#flatten" >-flatten</a>, and <a href="command-line-options.html#mosaic"
				5202	>-mosaic</a> are only aliases for the above methods and may be depreciated in
				5203	the future. Also see <a href="command-line-options.html#page" >-page</a>, <a href="command-line-options.html#repage"
				5204	>-repage</a> operators, the <a href="command-line-options.html#compose" >-compose</a> setting, and the
				5205	GIF <a href="command-line-options.html#dispose" >-dispose</a> and <a href="command-line-options.html#delay" >-delay</a>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5206	settings. </p>
				5207
				5208
				5209	<div style="margin: auto;">
				5210	<h3 class="magick-header"><a id="level"></a>-level <var>black_point</var>{,<var>white_point</var>}{<var>%</var>}{,<var>gamma</var>}</h3>
				5211	</div>
				5212
				5213	<p class="magick-description">adjust the level of image channels.</p>
				5214
				5215	<p>Given one, two or three values delimited with commas: black-point,
				5216	white-point, gamma (for example: 10,250,1.0 or 2%,98%,0.5). The black and
				5217	white points range from 0 to <var>QuantumRange</var>, or from 0 to
				5218	100%; if the white point is omitted it is set to (<var>QuantumRange</var> - black_point), so as to center contrast changes.
				5219	If a <code>%</code> sign is present anywhere in the string, both black and white
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5220	points are percentages of the full color range. Gamma will do a <a
				5221	href="command-line-options.html#gamma">-gamma</a> adjustment of the values. If it is omitted, the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5222	default of 1.0 (no gamma correction) is assumed.</p>
				5223
				5224	<p>In normal usage (<code>-level</code>) the image values are stretched so that
				5225	the given '<code>black_point</code>' value in the original image is set to zero
				5226	(or black), while the given '<code>white_point</code>' value is set to <var>QuantumRange</var> (or white). This provides you with direct
				5227	contrast adjustments to the image. The '<code>gamma</code>' of the resulting
				5228	image will then be adjusted. </p>
				5229
				5230	<p>From ImageMagick v6.4.1-9 using the plus form of the operator
				5231	(<code>+level</code>) or adding the special '!' flag anywhere in the argument
				5232	list, will cause the operator to do the reverse of the level adjustment. That
				5233	is a zero, or <var>QuantumRange</var> value (black, and white, resp.)
				5234	in the original image, is adjusted to the given level values, allowing you to
				5235	de-contrast, or compress the channel values within the image. The
				5236	'<code>gamma</code>' is adjusted before the level adjustment to de-contrast the
				5237	image is made. </p>
				5238
				5239	<p>Only the channels defined by the current <a href="command-line-options.html#channel">-channel</a>
				5240	setting are adjusted (defaults to RGB color channels only), allowing you to
				5241	limit the effect of this operator. </p>
				5242
				5243	<p>Please note that the transparency channel is treated as 'matte'
				5244	values (0 is opaque) and not as 'alpha' values (0 is transparent).</p>
				5245
				5246
				5247	<div style="margin: auto;">
				5248	<h3 class="magick-header"><a id="level-colors"></a>-level-colors {<var>black_color</var>}{,}{<var>white_color</var>}</h3>
				5249	</div>
				5250
				5251	<p class="magick-description">adjust the level of an image using the provided dash separated colors.</p>
				5252
				5253	<p>This function is exactly like <a href="command-line-options.html#level">-level</a>, except that the
				5254	value value for each color channel is determined by the
				5255	'<code>black_color</code>' and '<code>white_color</code>' colors given (as
				5256	described under the <a href="command-line-options.html#fill">-fill</a> option). </p>
				5257
				5258	<p>This effectually means the colors provided to <code>-level-colors</code>
				5259	is mapped to become 'black' and 'white' respectively, with all the other
				5260	colors linearly adjusted (or clipped) to match that change. Each channel is
				5261	adjusted separately using the channel values of the colors specified. </p>
				5262
				5263	<p>On the other hand the plus form of the operator (<code>+level-colors</code>)
				5264	will map the image color 'black' and 'white' to the given colors
				5265	respectively, resulting in a gradient (de-contrasting) tint of the image to
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	5266	those colors. This can also be used to convert a plain grayscale image into a
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5267	one using the gradient of colors specified. </p>
				5268
				5269	<p>By supplying a single color with a comma separator either before or after
				5270	that color, will just replace the respective 'black' or 'white' point
				5271	respectively. But if no comma separator is provided, the given color is
				5272	used for both the black and white color points, making the operator either
				5273	threshold the images around that color (- form) or set all colors to that
				5274	color (+ form). </p>
				5275
				5276
				5277	<div style="margin: auto;">
				5278	<h3 class="magick-header"><a id="limit"></a>-limit <var>type value</var></h3>
				5279	</div>
				5280
				5281	<p class="magick-description">Set the pixel cache resource limit.</p>
				5282
Cristy	e09ed31	2016-03-06 08:07:39 -0500	[diff] [blame]	5283	<p>Choose from: <code>width</code>, <code>height</code>, <code>area</code>, <code>memory</code>, <code>map</code>, <code>disk</code>, <code>file</code>, <code>thread</code>, <code>throttle</code>, or <code>time</code>.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5284
				5285	<p>The value for <code>file</code> is in number of files. The other limits are
				5286	in bytes. Define arguments for the memory, map, area, and disk resource limits
				5287	with SI prefixes (.e.g 100MB).</p>
				5288
				5289	<p>By default the limits are 768 files, 3GB of image area, 1.5GiB memory, 3GiB
				5290	memory map, and 18.45EB of disk. These limits are adjusted relative to the
				5291	available resources on your computer if this information is available. When
				5292	any limit is reached, ImageMagick fails in some fashion but attempts to take
				5293	compensating actions, if possible. For example, the following limits
				5294	memory:</p>
				5295
				5296	<pre>
				5297	-limit memory 32MiB -limit map 64MiB
				5298	</pre>
				5299
				5300	<p>Use <a href="command-line-options.html#list">-list resource</a> to list the current limits. For example, our system shows these limits:</p>
				5301
				5302	<pre>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5303	-> identify -list resource
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5304	Resource limits:
				5305	Width: 100MP
				5306	Height: 100MP
				5307	Area: 25.181GB
				5308	Memory: 11.726GiB
				5309	Map: 23.452GiB
				5310	Disk: unlimited
				5311	File: 768
				5312	Thread: 12
				5313	Throttle: 0
				5314	Time: unlimited
				5315	</pre>
				5316
				5317	<p>Requests for pixel storage to keep intermediate images are satisfied by one
				5318	of three resource categories: in-memory pool, memory-mapped files pool, and
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5319	disk pool (in that order) depending on the <a href="command-line-options.html#limit">‑limit</a> settings
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5320	and whether the system honors a resource request. If the total size of
				5321	allocated pixel storage in the given pool reaches the corresponding limit, the
				5322	request is passed to the next pool. Additionally, requests that exceed the
				5323	<code>area</code> limit automagically are allocated on disk.</p>
				5324
				5325	<p>To illustrate how ImageMagick utilizes resource limits, consider a typical
				5326	image resource request. First, ImageMagick tries to allocate the pixels in
				5327	memory. The request might be denied if the resource request exceeds the
				5328	<code>memory</code> limit or if the system does not honor the request. If
				5329	a memory request is not honored, the pixels are allocated to disk and the file
				5330	is memory-mapped. However, if the allocation request exceeds the
				5331	<code>map</code> limit, the resource allocation goes to disk. In all cases, if
				5332	the resource request exceeds the <code>area</code> limit, the pixels are
				5333	automagically cached to disk. If the disk has a hard limit, the program
				5334	fails.</p>
				5335
				5336	<p>In most cases you simply do not need to concern yourself with resource
				5337	limits. ImageMagick chooses reasonable defaults and most images do not tax
				5338	your computer resources. Where limits do come in handy is when you process
				5339	images that are large or on shared systems where ImageMagick can consume all
				5340	or most of the available memory. In this case, the ImageMagick workflow slows
				5341	other processes or, in extreme cases, brings the system to a halt. Under
				5342	these circumstances, setting limits give some assurances that the ImageMagick
				5343	workflow will not interfere with other concurrent uses of the computer. For
				5344	example, assume you have a web interface that processes images uploaded from
				5345	the Internet. To assure ImageMagick does not exceed 10MiB of memory you can
				5346	simply set the area limit to 10MiB:</p>
				5347
				5348	<pre>
				5349	-limit area 10MB
				5350	</pre>
				5351
				5352	<p>Now whenever a large image is processed, the pixels are automagically
				5353	cached to disk instead of memory. This of course implies that large images
				5354	typically process very slowly, simply because pixel processing in memory can
				5355	be an order of magnitude faster than on disk. Because your web site users
				5356	might inadvertently upload a huge image to process, you should set a disk
				5357	limit as well:</p>
				5358
				5359	<pre>
				5360	-limit area 10MB -limit disk 500MB
				5361	</pre>
				5362
				5363	<p>Here ImageMagick stops processing if an image requires more than 500MB of disk storage.</p>
				5364
				5365	<p>In addition to command-line resource limit option, resources can be set
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5366	with <a href="resources.html#environment" >environment variables</a>. Set the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5367	environment variables <code>MAGICK_AREA_LIMIT</code>,
				5368	<code>MAGICK_DISK_LIMIT</code>, <code>MAGICK_FILE_LIMIT</code>,
				5369	<code>MAGICK_MEMORY_LIMIT</code>, <code>MAGICK_MAP_LIMIT</code>,
				5370	<code>MAGICK_THREAD_LIMIT</code>, <code>MAGICK_TIME_LIMIT</code> for limits of
				5371	image area, disk space, open files, heap memory, memory map, number of threads
				5372	of execution, and maximum elapsed time in seconds respectively.</p>
				5373
				5374	<p> Inquisitive users can try adding <a href="command-line-options.html#debug">-debug cache</a> to
				5375	their commands and then scouring the generated output for references to the
				5376	pixel cache, in order to determine how the pixel cache was allocated and how
				5377	resources were consumed. Advanced Unix/Linux users can pipe that output
				5378	through <code>grep memory\|open\|destroy\|disk</code> for more readable sifting.
				5379	</p>
				5380
				5381	<p>For more about ImageMagick's use of resources, see the section <b>Cache
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5382	Storage and Resource Requirements</b> on the <a href="architecture.html#cache
				5383	">Architecture</a> page. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5384
				5385	<div style="margin: auto;">
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	5386	<h3 class="magick-header"><a id="linear-stretch"></a>-linear-stretch <var>black-point</var><br />-linear-stretch <var>black-point</var>{x<var>white-point</var>}{<var>%</var>}</h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5387	</div>
				5388
				5389	<p class="magick-description">Linear with saturation stretch.</p>
				5390
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5391	<p>This is very similar to <a href="command-line-options.html#contrast-stretch" >-contrast-stretch</a>,
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5392	and uses a 'histogram bin' to determine the range of color values that needs to
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5393	be stretched. However it then stretches those colors using the <a
				5394	href="command-line-options.html#level" >-level</a> operator.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5395
				5396	<p>As such while the initial determination may have 'binning' round off
				5397	effects, the image colors are stretched mathematically, rather than using the
				5398	histogram bins. This makes the operator more accurate. </p>
				5399
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5400	<p>note however that a <a href="command-line-options.html#linear-stretch" >-linear-stretch</a> of
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5401	'<code>0</code>' does nothing, while a value of '<code>1</code>' does a near
				5402	perfect stretch of the color range. </p>
				5403
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5404	<p>See also <a href="command-line-options.html#auto-level" >-auto-level</a> for a 'perfect'
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5405	normalization of mathematical images. </p>
				5406
				5407	<p>This operator is under review for re-development. </p>
				5408
				5409
				5410	<div style="margin: auto;">
				5411	<h3 class="magick-header"><a id="linewidth"></a>-linewidth</h3>
				5412	</div>
				5413
				5414	<p class="magick-description">the line width for subsequent draw operations.</p>
				5415
				5416	<div style="margin: auto;">
				5417	<h3 class="magick-header"><a id="liquid-rescale"></a>-liquid-rescale <var>geometry</var></h3>
				5418	</div>
				5419
				5420	<p class="magick-description">rescale image with seam-carving.</p>
				5421
				5422	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				5423
				5424	<div style="margin: auto;">
				5425	<h3 class="magick-header"><a id="list"></a>-list <var>type</var></h3>
				5426	</div>
				5427
				5428	<p class="magick-description">Print a list of supported arguments for various options or settings. Choose from these list types:</p>
				5429
				5430	<pre class="pre-scrollable">
				5431	Align
				5432	Alpha
				5433	Boolean
				5434	Cache
				5435	Channel
				5436	Class
				5437	ClipPath
				5438	Coder
				5439	Color
				5440	Colorspace
				5441	Command
				5442	Complex
				5443	Compose
				5444	Compress
				5445	Configure
				5446	DataType
				5447	Debug
				5448	Decoration
				5449	Delegate
				5450	Direction
				5451	Dispose
				5452	Distort
				5453	Dither
				5454	Endian
				5455	Evaluate
				5456	FillRule
				5457	Filter
				5458	Font
				5459	Format
				5460	Function
				5461	Gravity
				5462	Intensity
				5463	Intent
				5464	Interlace
				5465	Interpolate
				5466	Kernel
				5467	Layers
				5468	LineCap
				5469	LineJoin
				5470	List
				5471	Locale
				5472	LogEvent
				5473	Log
				5474	Magic
				5475	Method
				5476	Metric
				5477	Mime
				5478	Mode
				5479	Morphology
				5480	Module
				5481	Noise
				5482	Orientation
				5483	PixelIntensity
				5484	Policy
				5485	PolicyDomain
				5486	PolicyRights
				5487	Preview
				5488	Primitive
				5489	QuantumFormat
				5490	Resource
				5491	SparseColor
				5492	Statistic
				5493	Storage
				5494	Stretch
				5495	Style
				5496	Threshold
				5497	Type
				5498	Units
				5499	Validate
				5500	VirtualPixel
				5501	</pre>
				5502
				5503	<p>These lists vary depending on your version of ImageMagick. Use "<code>-list
				5504	list</code>" to get a complete listing of all the "<code>-list</code>" arguments
				5505	available:</p>
				5506
				5507	<pre>
				5508	identify -list list
				5509	</pre>
				5510
				5511	<div style="margin: auto;">
				5512	<h3 class="magick-header"><a id="log"></a>-log <var>string</var></h3>
				5513	</div>
				5514
				5515	<p class="magick-description">Specify format for debug log.</p>
				5516
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5517	<p>This option specifies the format for the log printed when the <a
				5518	href="command-line-options.html#debug">-debug</a> option is active.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5519
				5520	<p>You can display the following components by embedding special format
				5521	characters:</p>
				5522
				5523	<dl class="dl-horizontal">
				5524	<dt>%d</dt><dd>domain</dd>
				5525	<dt>%e</dt><dd>event</dd>
				5526	<dt>%f</dt><dd>function</dd>
				5527	<dt>%l</dt><dd>line</dd>
				5528	<dt>%m</dt><dd>module</dd>
				5529	<dt>%p</dt><dd>process ID</dd>
				5530	<dt>%r</dt><dd>real CPU time</dd>
				5531	<dt>%t</dt><dd>wall clock time</dd>
				5532	<dt>%u</dt><dd>user CPU time</dd>
				5533	<dt>%%</dt><dd>percent sign</dd>
				5534	<dt>\n</dt><dd>newline</dd>
				5535	<dt>\r</dt><dd>carriage return</dd>
				5536	</dl>
				5537
				5538	<p>For example:</p>
				5539
				5540	<pre>
				5541	convert -debug coders -log "%u %m:%l %e" in.gif out.png
				5542	</pre>
				5543
				5544	<p>The default behavior is to print all of the components.</p>
				5545
				5546	<div style="margin: auto;">
				5547	<h3 class="magick-header"><a id="loop"></a>-loop <var>iterations</var></h3>
				5548	</div>
				5549
				5550	<p class="magick-description">add Netscape loop extension to your GIF animation.</p>
				5551
				5552	<p>Set iterations to zero to repeat the animation an infinite number of times,
				5553	otherwise the animation repeats itself up to <var>iterations</var>
				5554	times.</p>
				5555
				5556	<div style="margin: auto;">
				5557	<h3 class="magick-header"><a id="lowlight-color"></a>-lowlight-color <var>color</var></h3>
				5558	</div>
				5559
				5560	<p class="magick-description">when comparing images, de-emphasize pixel differences with this color.</p>
				5561
				5562	<div style="margin: auto;">
				5563	<h3 class="magick-header"><a id="magnify"></a>-magnify</h3>
				5564	</div>
				5565
				5566	<p class="magick-description">double the size of the image with pixel art scaling.</p>
				5567
				5568
				5569	<div style="margin: auto;">
				5570	<h3 class="magick-header"><a id="map"></a>-map <var>type</var></h3>
				5571	</div>
				5572
				5573	<p class="magick-description">Display image using this <var>type</var>.</p>
				5574
				5575	<p>Choose from these <var>Standard Colormap</var> types:</p>
				5576
				5577	<pre>
				5578	best
				5579	default
				5580	gray
				5581	red
				5582	green
				5583	blue
				5584	</pre>
				5585
				5586	<p>The <var>X server</var> must support the <var>Standard
				5587	Colormap</var> you choose, otherwise an error occurs. Use <code>list</code> as
				5588	the type and <code>display</code> searches the list of colormap types in
				5589	<code>top-to-bottom</code> order until one is located. See <var>xstdcmap(1)</var> for one way of creating Standard Colormaps.</p>
				5590
				5591
				5592	<div style="margin: auto;">
				5593	<h3 class="magick-header"><a id="map_stream_"></a>-map <var>components</var></h3>
				5594	</div>
				5595
				5596	<p class="magick-description">pixel map.</p>
				5597
				5598	<p>Here are the valid components of a map:</p>
				5599
				5600	<dl class="dl-horizontal">
				5601	<dt>r</dt><dd> red pixel component</dd>
				5602	<dt>g</dt><dd> green pixel component</dd>
				5603	<dt>b</dt><dd> blue pixel component</dd>
				5604	<dt>a</dt><dd> alpha pixel component (0 is transparent)</dd>
				5605	<dt>o</dt><dd> opacity pixel component (0 is opaque)</dd>
				5606	<dt>i</dt><dd> grayscale intensity pixel component</dd>
				5607	<dt>c</dt><dd> cyan pixel component</dd>
				5608	<dt>m</dt><dd> magenta pixel component</dd>
				5609	<dt>y</dt><dd> yellow pixel component</dd>
				5610	<dt>k</dt><dd> black pixel component</dd>
				5611	<dt>p</dt><dd> pad component (always 0)</dd>
				5612	</dl>
				5613
				5614	<p>You can specify as many of these components as needed in any order (e.g.
				5615	bgr). The components can repeat as well (e.g. rgbr).</p>
				5616
				5617
				5618	<div style="margin: auto;">
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5619	<h3 class="magick-header"><a id="mattecolor"></a>-mattecolor <var>color</var></h3>
				5620	</div>
				5621
				5622	<p class="magick-description">Specify the color to be used with the <a href="command-line-options.html#frame">-frame</a> option.</p>
				5623
				5624	<p>The color is specified using the format described under the <a href="command-line-options.html#fill">-fill</a> option.</p>
				5625
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5626	<p>The default matte color is <code>#BDBDBD</code>, <span
				5627	style="background-color: #bdbdbd;">this shade of gray</span>.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5628
Cristy	f650f4f	2016-04-01 10:53:07 -0400	[diff] [blame]	5629	<p>This is an IMv6 option, use <a href="command-line-options.html#alpha-color">-alpha-color</a> with IMv7.</p>
				5630
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5631	<div style="margin: auto;">
				5632	<h3 class="magick-header"><a id="maximum"></a>-maximum</h3>
				5633	</div>
				5634
				5635	<p class="magick-description">return the maximum intensity of an image sequence.</p>
				5636
				5637	<p>Select the 'maximum' value from all the surrounding pixels. </p>
				5638
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5639	<p>This is legacy option from the <a href="command-line-options.html#statistic" >method</a> of the same
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5640	name. </p>
				5641
				5642	<div style="margin: auto;">
				5643	<h3 class="magick-header"><a id="median"></a>-median <var>geometry</var></h3>
				5644	</div>
				5645
				5646	<p class="magick-description">apply a median filter to the image.</p>
				5647
				5648	<p>Select the 'middle' value from all the surrounding pixels. </p>
				5649
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5650	<p>This is legacy option from the <a href="command-line-options.html#statistic" >method</a> of the same
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5651	name. </p>
				5652
				5653	<div style="margin: auto;">
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	5654	<h3 class="magick-header"><a id="mean-shift"></a>-mean-shift <var>width</var>x<var>height</var>{<var>+distance</var>{%}</h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5655	</div>
				5656
				5657	<p class="magick-description">image noise removal and color reduction/segmentation (e.g. -mean-shift 7x7+10%).</p>
				5658
				5659	<p><var>width</var>x<var>height</var> is the window size and <var>distance</var> is the color distance measured in the range 0 to 1 or 0 to 100%</p>
				5660
				5661	<p>The mean shift algorithm is iterative and thus slower the larger the window size. For each pixel, it gets all the pixels in the window centered at the pixel and excludes those that are outside the <var>radius=sqrt((width-1)(height-1)/4)</var> surrounding the pixel. From those pixels, it finds which of them are within the specified squared color distance from the current mean. It then computes a new x,y centroid from those coordinates and a new mean. This new x,y centroid is used as the center for a new window. This process is iterated until it converges and the final mean is then used to replace the original pixel value. It repeats this process for the next pixel, etc, until it processes all pixels in the image. Results are better when using other colorspaces rather than RGB. Recommend YIQ, YUV or YCbCr, which seem to give equivalent results.</p>
				5662
				5663	<div style="margin: auto;">
				5664	<h3 class="magick-header"><a id="metric"></a>-metric <var>type</var></h3>
				5665	</div>
				5666
				5667	<p class="magick-description">Output to STDERR a measure of the differences between images according to the <var>type</var> given metric.</p>
				5668
				5669	<p>Choose from:</p>
				5670
				5671	<dl class="dl-horizontal">
				5672	<dt>AE</dt><dd> absolute error count, number of different pixels (-fuzz effected)</dd>
				5673	<dt>FUZZ</dt><dd> mean color distance</dd>
				5674	<dt>MAE</dt><dd> mean absolute error (normalized), average channel error distance</dd>
				5675	<dt>MEPP</dt><dd> mean error per pixel (normalized mean error, normalized peak error)</dd>
				5676	<dt>MSE</dt><dd> mean error squared, average of the channel error squared</dd>
				5677	<dt>NCC</dt><dd> normalized cross correlation</dd>
				5678	<dt>PAE</dt><dd> peak absolute (normalized peak absolute)</dd>
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame^]	5679	<dt>PHASH</dt><dd> perceptual hash for the sRGB and HCLp colorspaces. Specify an alternative colorspace with <code>-define phash:colorspaces=<var>colorspace,colorspace,...</var></code></dd>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5680	<dt>PSNR</dt><dd> peak signal to noise ratio</dd>
				5681	<dt>RMSE</dt><dd> root mean squared (normalized root mean squared)</dd>
				5682	</dl>
				5683
				5684	<p>Control the '<code>AE</code>', or absolute count of pixels that are different,
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5685	with the <a href="command-line-options.html#fuzz" >-fuzz</a> factor (ignore pixels which
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5686	only changed by a small amount). Use '<code>PAE</code>' to find the
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5687	size of the <a href="command-line-options.html#fuzz" >-fuzz</a> factor needed to make all pixels
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5688	'similar', while '<code>MAE</code>' determines the factor needed
				5689	for about half the pixels to be similar. </p>
				5690
				5691	<p>The '<code>MEPP</code>' metric returns three different metrics
				5692	('<code>MAE</code>', '<code>MAE</code>' normalized, and '<code>PAE</code>'
				5693	normalized) from a single comparison run. </p>
				5694
				5695	<p>To print a complete list of metrics, use the <a href="command-line-options.html#list">-list
				5696	metric</a> option.</p>
				5697
				5698
				5699	<div style="margin: auto;">
				5700	<h3 class="magick-header"><a id="minimum"></a>-minimum</h3>
				5701	</div>
				5702
				5703	<p class="magick-description">return the minimum intensity of an image sequence.</p>
				5704
				5705	<p>Select the 'minimal' value from all the surrounding pixels. </p>
				5706
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5707	<p>This is legacy option from the <a href="command-line-options.html#statistic" >method</a> of the same
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5708	name. </p>
				5709
				5710
				5711
				5712	<div style="margin: auto;">
				5713	<h3 class="magick-header"><a id="mode"></a>-mode <var>geometry</var></h3>
				5714	</div>
				5715
				5716	<p class="magick-description">make each pixel the \'predominant color\' of the neighborhood.'</p>
				5717
				5718	<div style="margin: auto;">
				5719	<h3 class="magick-header">-mode <var>value</var></h3>
				5720	</div>
				5721
				5722	<p class="magick-description">Mode of operation.</p>
				5723
				5724	<p>Choose the <var>value</var> from these styles: <code>Frame,
				5725	Unframe, or Concatenate</code></p>
				5726
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5727	<p>Use the <a href="command-line-options.html#list" >-list</a> option with a '<code>Mode</code>' argument
				5728	for a list of <a href="command-line-options.html#mode" >-mode</a> arguments available in your
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5729	ImageMagick installation.</p>
				5730
				5731
				5732	<div style="margin: auto;">
				5733	<h3 class="magick-header"><a id="modulate"></a>-modulate <var>brightness</var>[,<var>saturation</var>,<var>hue</var>]</h3>
				5734	</div>
				5735
				5736	<p class="magick-description">Vary the <var>brightness</var>, <var>saturation</var>, and <var>hue</var> of an image.</p>
				5737
				5738	<p>The arguments are given as a percentages of variation. A value of 100 means
				5739	no change, and any missing values are taken to mean 100.</p>
				5740
				5741	<p>The <var>brightness</var> is a multiplier of the overall
				5742	brightness of the image, so 0 means pure black, 50 is half as bright, 200 is
				5743	twice as bright. To invert its meaning <a href="command-line-options.html#negate">-negate</a> the image
				5744	before and after. </p>
				5745
				5746	<p>The <var>saturation</var> controls the amount of color in an
				5747	image. For example, 0 produce a grayscale image, while a large value such as
				5748	200 produce a very colorful, 'cartoonish' color.</p>
				5749
				5750	<p>The <var>hue</var> argument causes a "rotation" of the colors
				5751	within the image by the amount specified. For example, 50 results in
				5752	a counter-clockwise rotation of 90, mapping red shades to purple, and so on.
				5753	A value of either 0 or 200 results in a complete 180 degree rotation of the
				5754	image. Using a value of 300 is a 360 degree rotation resulting in no change to
				5755	the original image. </p>
				5756
				5757	<p>For example, to increase the color brightness by 20% and decrease the color
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5758	saturation by 10% and leave the hue unchanged, use <a
				5759	href="command-line-options.html#modulate">-modulate 120,90</a>.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5760
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5761	<p>Use <a href="command-line-options.html#set">-set</a> attribute of '<code
				5762	>option:modulate:colorspace</code>' to specify which colorspace to
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5763	modulate. Choose from <code>HCL</code>, <code>HCLp</code>, <code>HSB</code>, <code>HSI</code>, <code>HSL</code> (the default), <code>HSV</code>, <code>HWB</code>, or <code>LCH</code> (LCHuv). For example,</p>
				5764
				5765	<pre>
				5766	convert image.png -set option:modulate:colorspace hsb -modulate 120,90 modulate.png
				5767	</pre>
				5768
				5769	<div style="margin: auto;">
				5770	<h3 class="magick-header"><a id="moments"></a>-moments</h3>
				5771	</div>
				5772
				5773	<p class="magick-description">report image moments and perceptual hash.</p>
				5774
				5775
				5776	<div style="margin: auto;">
				5777	<h3 class="magick-header"><a id="monitor"></a>-monitor</h3>
				5778	</div>
				5779
				5780	<p class="magick-description">monitor progress.</p>
				5781
				5782
				5783	<div style="margin: auto;">
				5784	<h3 class="magick-header"><a id="monochrome"></a>-monochrome</h3>
				5785	</div>
				5786
				5787	<p class="magick-description">transform the image to black and white.</p>
				5788
				5789	<div style="margin: auto;">
				5790	<h3 class="magick-header"><a id="morph"></a>-morph <var>frames</var></h3>
				5791	</div>
				5792
				5793	<p class="magick-description">morphs an image sequence.</p>
				5794
				5795	<p>Both the image pixels and size are linearly interpolated to give the
				5796	appearance of a metamorphosis from one image to the next, over all the images
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5797	in the current image list. The added images are the equivalent of a <a
				5798	href="command-line-options.html#blend">-blend</a> composition. The <var>frames</var>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5799	argument determine how many images to interpolate between each image. </p>
				5800
				5801
				5802	<div style="margin: auto;">
				5803	<h3 class="magick-header"><a id="morphology"></a>-morphology</h3>
				5804	<h3 class="magick-header">-morphology <var>method</var> <var>kernel</var></h3>
				5805	</div>
				5806
				5807	<p class="magick-description">apply a morphology method to the image.</p>
				5808
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5809	<p>Until I get around to writing an option summary for this, see <a
Cristy	364a72f	2016-11-04 22:38:41 -0400	[diff] [blame]	5810	href="https://www.imagemagick.org/Usage/morphology/" >IM Usage Examples,
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5811	Morphology</a>. </p>
				5812
				5813
				5814	<div style="margin: auto;">
				5815	<h3 class="magick-header"><a id="mosaic"></a>-mosaic</h3>
				5816	</div>
				5817
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5818	<p class="magick-description">an simple alias for the <a href="command-line-options.html#layers" >-layers</a> method "mosaic"</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5819
				5820
				5821	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5822	<h3 class="magick-header"><a id="motion-blur"></a>-motion-blur <var>radius</var><br />-motion-blur <var>radius</var>x<var>sigma</var>+<var>angle</var></h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5823	</div>
				5824
				5825	<p class="magick-description">simulate motion blur.</p>
				5826
				5827	<p>Blur with the given radius, standard deviation (sigma), and angle. The
				5828	angle given is the angle toward which the image is blurred. That is the
				5829	direction people would consider the object is coming from. </p>
				5830
				5831	<p>Note that the blur is not uniform distribution, giving the motion a
				5832	definite sense of direction of movement. </p>
				5833
				5834	<p>The <a href="command-line-options.html#virtual-pixel">-virtual-pixel</a> setting will determine how
				5835	pixels which are outside the image proper are blurred into the final result.
				5836	</p>
				5837
				5838	<div style="margin: auto;">
				5839	<h3 class="magick-header"><a id="name"></a>-name</h3>
				5840	</div>
				5841
				5842	<p class="magick-description">name an image.</p>
				5843	<div style="margin: auto;">
				5844	<h3 class="magick-header"><a id="negate"></a>-negate</h3>
				5845	</div>
				5846
				5847	<p class="magick-description">replace each pixel with its complementary color.</p>
				5848
				5849	<p>The red, green, and blue intensities of an image are negated. White becomes
				5850	black, yellow becomes blue, etc. Use <a href="command-line-options.html#negate">+negate</a> to only
				5851	negate the grayscale pixels of the image.</p>
				5852
				5853	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5854	<h3 class="magick-header"><a id="noise"></a>-noise <var>geometry</var><br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5855	+noise <var>type</var></h3>
				5856	</div>
				5857
				5858	<p class="magick-description">Add or reduce noise in an image.</p>
				5859
				5860	<p>The principal function of noise peak elimination filter is to smooth the
				5861	objects within an image without losing edge information and without creating
				5862	undesired structures. The central idea of the algorithm is to replace a pixel
				5863	with its next neighbor in value within a pixel window, if this pixel has been
				5864	found to be noise. A pixel is defined as noise if and only if this pixel is
				5865	a maximum or minimum within the pixel window.</p>
				5866
				5867	<p>Use <code><a href="command-line-options.html#noise">-noise</a> <var>radius</var></code> to
				5868	specify the width of the neighborhood when reducing noise. This is equivalent
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5869	to using a <code><a href="command-line-options.html#statistic" >-statistic</a> NonPeak</code> operation,
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5870	which should be used in preference.</p>
				5871
				5872	<p>Use <a href="command-line-options.html#noise">+noise</a> followed by a noise <var>type</var> to add noise to an image. Choose from these noise
				5873	types:</p>
				5874
				5875	<pre>
				5876	Gaussian
				5877	Impulse
				5878	Laplacian
				5879	Multiplicative
				5880	Poisson
				5881	Random
				5882	Uniform
				5883	</pre>
				5884
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5885	<p>The amount of noise added can be controlled by the <code><a
				5886	href="command-line-options.html#attenuate" >-attenuate</a></code> setting. If unset the value is
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5887	equivalent to 1.0, or a maximum noise addition.</p>
				5888
				5889	<p>Note that Random will replace the image with noise rather than add noise to the image. Use Uniform, if you wish to add random noise to the image.</p>
				5890
				5891	<p>To print a complete list of noises, use the <a href="command-line-options.html#list">-list noise</a> option.</p>
				5892
				5893	<p>Also see the <a href="command-line-options.html#evaluate">-evaluate</a> noise functions that allows
				5894	the use of a controlling value to specify the amount of noise that should be
				5895	added to an image. </p>
				5896
				5897
				5898	<div style="margin: auto;">
				5899	<h3 class="magick-header"><a id="normalize"></a>-normalize</h3>
				5900	</div>
				5901
				5902	<p class="magick-description">Increase the contrast in an image by <var>stretching</var> the range of intensity values.</p>
				5903
				5904	<p>The intensity values are stretched to cover the entire range of possible
				5905	values. While doing so, black-out at most <var>2%</var> of the pixels and
				5906	white-out at most <var>1%</var> of the pixels.</p>
				5907
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5908	<p>Note that as of ImageMagick 6.4.7-0, <a href="command-line-options.html#normalize" >-normalize</a>
				5909	is equivalent to <a href="command-line-options.html#contrast-stretch" >-contrast-stretch 2%x1%</a>.
				5910	(Before this version, it was equivalent to <a href="command-line-options.html#contrast-stretch"
				5911	>-contrast-stretch 2%x99%</a>).</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5912
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	5913	<p>All the channels are normalized in concert by the same amount so as to
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5914	preserve color integrity, when the default <a href="command-line-options.html#channel" >+channel</a>
				5915	setting is in use. Specifying any other <a href="command-line-options.html#channel" >-channel</a>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5916	setting will normalize the RGB channels independently.</p>
				5917
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5918	<p>See <a href="command-line-options.html#contrast-stretch" >-contrast-stretch</a> for more details.
				5919	Also see <a href="command-line-options.html#auto-level" >-auto-level</a> for a 'perfect' normalization
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5920	that is better suited to mathematically generated images. </p>
				5921
				5922	<p>This operator is under review for re-development. </p>
				5923
				5924
				5925	<div style="margin: auto;">
				5926	<h3 class="magick-header"><a id="opaque"></a>-opaque <var>color</var></h3>
				5927	</div>
				5928
				5929	<p class="magick-description">change this color to the fill color within the image.</p>
				5930
				5931	<p>The <var>color</var> argument is defined using the format
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5932	described under the <a href="command-line-options.html#fill" >-fill</a> option. The <a href="command-line-options.html#fuzz"
				5933	>-fuzz</a> setting can be used to match and replace colors similar to the one
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5934	given.</p>
				5935
				5936	<p>Use <a href="command-line-options.html#opaque">+opaque</a> to paint any pixel that does not match
				5937	the target color. </p>
				5938
				5939	<p>The <a href="command-line-options.html#transparent">-transparent</a> operator is exactly the same
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5940	as <a href="command-line-options.html#opaque" >-opaque</a> but replaces the matching color with
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5941	transparency rather than the current <a href="command-line-options.html#fill">-fill</a> color setting.
				5942	To ensure that it can do this it also ensures that the image has an alpha
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5943	channel enabled, as per "<code><a href="command-line-options.html#alpha" >-alpha</a> set</code>", for
				5944	the new transparent colors, and does not require you to modify the <a
				5945	href="command-line-options.html#channel">-channel</a> to enable alpha channel handling. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5946
				5947
				5948	<div style="margin: auto;">
				5949	<h3 class="magick-header"><a id="ordered-dither"></a>-ordered-dither <var>threshold_map</var>{,<var>level</var>...}</h3>
				5950	</div>
				5951
				5952	<p class="magick-description">dither the image using a pre-defined ordered dither <var>threshold map</var> specified, and a uniform color map with the
				5953	given number of <var>levels</var> per color channel.</p>
				5954
				5955	<p>You can choose from these standard threshold maps:</p>
				5956
				5957	<pre class="pre-scrollable">
				5958	threshold 1x1 Threshold 1x1 (non-dither)
				5959	checks 2x1 Checkerboard 2x1 (dither)
				5960	o2x2 2x2 Ordered 2x2 (dispersed)
				5961	o3x3 3x3 Ordered 3x3 (dispersed)
				5962	o4x4 4x4 Ordered 4x4 (dispersed)
				5963	o8x8 8x8 Ordered 8x8 (dispersed)
				5964	h3x4a 4x1 Halftone 4x4 (angled)
				5965	h6x6a 6x1 Halftone 6x6 (angled)
				5966	h8x8a 8x1 Halftone 8x8 (angled)
				5967	h3x4o Halftone 4x4 (orthogonal)
				5968	h6x6o Halftone 6x6 (orthogonal)
				5969	h8x8o Halftone 8x8 (orthogonal)
				5970	h36x16o Halftone 16x16 (orthogonal)
				5971	c5x5b c5x5 Circles 5x5 (black)
				5972	c5x5w Circles 5x5 (white)
				5973	c6x6b c6x6 Circles 6x6 (black)
				5974	c6x6w Circles 6x6 (white)
				5975	c7x7b c7x7 Circles 7x7 (black)
				5976	c7x7w Circles 7x7 (white)
				5977	</pre>
				5978
				5979	<p> The <code>threshold</code> generated a simple 50% threshold of the image.
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5980	This could be used with <var >level</var> to do the equivalent of <a
				5981	href="command-line-options.html#posterize" >-posterize</a> to reduce an image to basic primary colors.
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5982	</p>
				5983
				5984	<p>The <code>checks</code> pattern produces a 3 level checkerboard dither
				5985	pattern. That is a grayscale will become a pattern of solid black, solid
				5986	white, and mid-tone colors into a checkerboard pattern of black and white.
				5987	</p>
				5988
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5989	<p>You can define your own <var >threshold map</var> for ordered
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5990	dithering and halftoning your images, in either personal or system
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5991	<code>thresholds.xml</code> XML file. See <a href="resources.html" >Resources</a>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5992	for more details of configuration files. </p>
				5993
				5994	<p>To print a complete list of the thresholds that have been defined, use the
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5995	<a href="command-line-options.html#list" >-list threshold</a> option.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5996
				5997	<p>Note that at this time the same threshold dithering map is used for all
				5998	color channels, no attempt is made to offset or rotate the map for different
				5999	channels is made, to create an offset printing effect. Also as the maps are
				6000	simple threshold levels, the halftone and circle maps will create incomplete
				6001	circles along the edges of a colored area. Also all the effects are purely
				6002	on/off boolean effects, without anti-aliasing to make the circles smooth
				6003	looking. Large dots can be made to look better with a small amount of blurring
				6004	after being created. </p>
				6005
				6006
				6007	<div style="margin: auto;">
				6008	<h3 class="magick-header"><a id="orient"></a>-orient <var>image orientation</var></h3>
				6009	</div>
				6010
				6011	<p class="magick-description">specify orientation of a digital camera image.</p>
				6012
				6013	<p>Choose from these orientations:</p>
				6014
				6015	<pre>
				6016	bottom-left right-top
				6017	bottom-right top-left
				6018	left-bottom top-right
				6019	left-top undefined
				6020	right-bottom
				6021	</pre>
				6022
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6023	<p>To print a complete list of orientations, use the <a href="command-line-options.html#list" >-list
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6024	orientation</a> option.</p>
				6025
				6026
				6027	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6028	<h3 class="magick-header"><a id="page"></a>-page <var>geometry</var><br/>
				6029	-page <var>media</var>[<var>offset</var>][{<var>^!<></var>}]<br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6030	+page
				6031	</h3>
				6032	</div>
				6033
				6034	<p class="magick-description">Set the size and location of an image on the larger virtual canvas.</p>
				6035
				6036	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				6037
				6038	<p>For convenience you can specify the page size using <var>media</var> (see below). Offsets can then be added as with other
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6039	<var>geometry</var> arguments (e.g. <a
				6040	href="command-line-options.html#page">-page</a> <code>Letter+43+43</code>).</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6041
				6042	<p>Use <var>media</var> as shorthand to specify the dimensions (<var>width</var>x<var>height</var>) of the <var>PostScript</var> page in dots per inch or a TEXT page in pixels.
				6043	The choices for a PostScript page are:</p>
				6044
				6045	<dl class="dl-horizontal">
				6046	<dt> 11x17 </dt> <dd> 792 x 1224</dd>
				6047	<dt> Ledger </dt> <dd> 1224 x 792</dd>
				6048	<dt> Legal </dt> <dd> 612 x 1008</dd>
				6049	<dt> Letter </dt> <dd> 612 x 792</dd>
				6050	<dt> LetterSmall</dt> <dd> 612 x 792</dd>
				6051	<dt> ArchE </dt> <dd> 2592 x 3456</dd>
				6052	<dt> ArchD </dt> <dd> 1728 x 2592</dd>
				6053	<dt> ArchC </dt> <dd> 1296 x 1728</dd>
				6054	<dt> ArchB </dt> <dd> 864 x 1296</dd>
				6055	<dt> ArchA </dt> <dd> 648 x 864</dd>
				6056	<dt> A0 </dt> <dd> 2380 x 3368</dd>
				6057	<dt> A1 </dt> <dd> 1684 x 2380</dd>
				6058	<dt> A2 </dt> <dd> 1190 x 1684</dd>
				6059	<dt> A3 </dt> <dd> 842 x 1190</dd>
				6060	<dt> A4 </dt> <dd> 595 x 842</dd>
				6061	<dt> A4Small </dt> <dd> 595 x 842</dd>
				6062	<dt> A5 </dt> <dd> 421 x 595</dd>
				6063	<dt> A6 </dt> <dd> 297 x 421</dd>
				6064	<dt> A7 </dt> <dd> 210 x 297</dd>
				6065	<dt> A8 </dt> <dd> 148 x 210</dd>
				6066	<dt> A9 </dt> <dd> 105 x 148</dd>
				6067	<dt> A10 </dt> <dd> 74 x 105</dd>
				6068	<dt> B0 </dt> <dd> 2836 x 4008</dd>
				6069	<dt> B1 </dt> <dd> 2004 x 2836</dd>
				6070	<dt> B2 </dt> <dd> 1418 x 2004</dd>
				6071	<dt> B3 </dt> <dd> 1002 x 1418</dd>
				6072	<dt> B4 </dt> <dd> 709 x 1002</dd>
				6073	<dt> B5 </dt> <dd> 501 x 709</dd>
				6074	<dt> C0 </dt> <dd> 2600 x 3677</dd>
				6075	<dt> C1 </dt> <dd> 1837 x 2600</dd>
				6076	<dt> C2 </dt> <dd> 1298 x 1837</dd>
				6077	<dt> C3 </dt> <dd> 918 x 1298</dd>
				6078	<dt> C4 </dt> <dd> 649 x 918</dd>
				6079	<dt> C5 </dt> <dd> 459 x 649</dd>
				6080	<dt> C6 </dt> <dd> 323 x 459</dd>
				6081	<dt> Flsa </dt> <dd> 612 x 936</dd>
				6082	<dt> Flse </dt> <dd> 612 x 936</dd>
				6083	<dt> HalfLetter </dt> <dd> 396 x 612</dd>
				6084	</dl>
				6085
				6086	<p>This option is also used to place subimages when writing to a multi-image
				6087	format that supports offsets, such as GIF89 and MNG. When used for this
				6088	purpose the offsets are always measured from the top left corner of the canvas
				6089	and are not affected by the <a href="command-line-options.html#gravity">-gravity</a> option. To
				6090	position a GIF or MNG image, use <a href="command-line-options.html#page">-page</a><var>{+-}x{+-}y</var> (e.g. -page +100+200). When writing to a MNG
				6091	file, a <a href="command-line-options.html#page">-page</a> option appearing ahead of the first image in
				6092	the sequence with nonzero width and height defines the width and height values
				6093	that are written in the <code>MHDR</code> chunk. Otherwise, the MNG width and
				6094	height are computed from the bounding box that contains all images in the
				6095	sequence. When writing a GIF89 file, only the bounding box method is used to
				6096	determine its dimensions.</p>
				6097
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6098	<p>For a PostScript page, the image is sized as in <a
				6099	href="command-line-options.html#geometry">-geometry</a> but positioned relative to the <var>lower
				6100	left-hand corner</var> of the page by {+-}<code>x</code><var>offset</var>{+-}<code>y</code> <var>offset</var>. Use <a
				6101	href="command-line-options.html#page">-page 612x792</a>, for example, to center the image within the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6102	page. If the image size exceeds the PostScript page, it is reduced to fit the
				6103	page. The default gravity for the <a href="command-line-options.html#page">-page</a> option is <var>NorthWest</var>, i.e., positive <code>x</code> and <code>y</code> <var>offset</var> are measured rightward and downward from the top left
				6104	corner of the page, unless the <a href="command-line-options.html#gravity">-gravity</a> option is
				6105	present with a value other than <var>NorthWest</var>.</p>
				6106
				6107	<p>The default page dimensions for a TEXT image is 612x792.</p>
				6108
				6109	<p>This option is used in concert with <a href="command-line-options.html#density">-density</a>.</p>
				6110
				6111	<p>Use <a href="command-line-options.html#page">+page</a> to remove the page settings for an image.</p>
				6112
				6113	<div style="margin: auto;">
				6114	<h3 class="magick-header"><a id="paint"></a>-paint <var>radius</var></h3>
				6115	</div>
				6116
				6117	<p class="magick-description">simulate an oil painting.</p>
				6118
				6119	<p>Each pixel is replaced by the most frequent color in a circular
				6120	neighborhood whose width is specified with <var>radius</var>.</p>
				6121
				6122	<div style="margin: auto;">
				6123	<h3 class="magick-header"><a id="path"></a>-path <var>path</var></h3></div>
				6124
				6125	<p class="magick-description">write images to this path on disk.</p>
				6126
				6127	<div style="margin: auto;">
				6128	<h3 class="magick-header"><a id="pause_animate_"></a>-pause <var>seconds</var></h3>
				6129	</div>
				6130
				6131	<p class="magick-description">Pause between animation loops</p>
				6132
				6133	<p>Pause for the specified number of seconds before repeating the animation.</p>
				6134
				6135	<div style="margin: auto;">
				6136	<h3 class="magick-header"><a id="pause_import_"></a>-pause <var>seconds</var></h3>
				6137	</div>
				6138
				6139	<p class="magick-description">Pause between snapshots.</p>
				6140
				6141	<p>Pause for the specified number of seconds before taking the next snapshot.</p>
				6142
				6143	<div style="margin: auto;">
				6144	<h3 class="magick-header"><a id="perceptible"></a>-perceptible <var>epsilon</var></h3>
				6145	</div>
				6146
				6147	<p class="magick-description">set each pixel whose value is less than \|<var>epsilon</var>\| to <var>-epsilon</var> or <var>epsilon</var> (whichever is closer) otherwise the pixel value remains unchanged.</p>
				6148
				6149	<div style="margin: auto;">
				6150	<h3 class="magick-header"><a id="ping"></a>-ping</h3>
				6151	</div>
				6152
				6153	<p class="magick-description">efficiently determine image characteristics.</p>
				6154
				6155	<div style="margin: auto;">
				6156	<h3 class="magick-header"><a id="pointsize"></a>-pointsize <var>value</var></h3>
				6157	</div>
				6158
				6159	<p class="magick-description">pointsize of the PostScript, OPTION1, or TrueType font.</p>
				6160
				6161	<div style="margin: auto;">
				6162	<h3 class="magick-header"><a id="polaroid"></a>-polaroid <var>angle</var></h3>
				6163	</div>
				6164
				6165	<p class="magick-description">simulate a Polaroid picture.</p>
				6166
				6167	<p>Use <code>+polaroid</code> to rotate the image at a random angle between -15 and +15 degrees.</p>
				6168
				6169	<div style="margin: auto;">
				6170	<h3 class="magick-header"><a id="poly"></a>-poly <var>"wt,exp ..."</var></h3>
				6171	</div>
				6172
				6173	<p class="magick-description">combines multiple images according to a weighted sum of polynomials; one floating point weight (coefficient) and one floating point polynomial exponent (power) for each image expressed as comma separated pairs.</p>
				6174
				6175	<p> The weights should typically be fractions between -1 and 1. But the sum of weights should be 1 or at least between 0 and 1 to avoid clamping in non-hdri mode at black and white.</p>
				6176
				6177	<p>The exponents may be positive, negative or zero. A negative exponent is equivalent to 1 divided by the image raised to the corresponding positive exponent. A zero exponent always produces 1 scaled by quantumrange to white, i.e. wt*white, no matter what the image.</p>
				6178
				6179	<p>The format is: <var>output = wt1image1^exp1 + wt2image2^exp2 </var>...</p>
				6180
				6181	<p>Some simple uses are:</p>
				6182	<ul>
				6183	<li>A weighted sum of each image provided all weights add to unity and all exponents=1. If the the weights are all equal to 1/(number of images), then this is equivalent to <a href="command-line-options.html#profile">-evaluate-sequence</a> <var>mean</var>.</li>
				6184	<li>The sum of squares of two or more images, provided the weights are equal (and sum to 1 to avoid clamping) and the exponents equal 2.</li>
				6185	</ul>
				6186
				6187	<p>Note that one may add a constant color to the expression simply by using xc:somecolor for one of the images and specifying the desired weight and exponent equal to 0.</p>
				6188
				6189	<p>Similarly one may add white to the expression by simply using null: (or xc:white) for one of the images with the appropriate weight and exponent equal to 0.</p>
				6190
				6191
				6192	<div style="margin: auto;">
				6193	<h3 class="magick-header"><a id="posterize"></a>-posterize <var>levels</var></h3>
				6194	</div>
				6195
				6196	<p class="magick-description">reduce the image to a limited number of color levels per channel.</p>
				6197
				6198	<p>Very low values of <var>levels</var>, e.g., 2, 3, 4, have the most
				6199	visible effect.</p>
				6200
				6201	<div style="margin: auto;">
				6202	<h3 class="magick-header"><a id="precision"></a>-precision <var>value</var></h3>
				6203	</div>
				6204
				6205	<p class="magick-description">set the maximum number of significant digits to be printed.</p>
				6206
				6207	<div style="margin: auto;">
				6208	<h3 class="magick-header"><a id="preview"></a>-preview <var>type</var></h3>
				6209	</div>
				6210
				6211	<p class="magick-description">image preview type.</p>
				6212
				6213	<p>Use this option to affect the preview operation of an image (e.g.
				6214	<code>convert file.png -preview Gamma Preview:gamma.png</code>). Choose from
				6215	these previews:</p>
				6216
				6217	<pre class="pre-scrollable">
				6218	AddNoise
				6219	Blur
				6220	Brightness
				6221	Charcoal
				6222	Despeckle
				6223	Dull
				6224	EdgeDetect
				6225	Gamma
				6226	Grayscale
				6227	Hue
				6228	Implode
				6229	JPEG
				6230	OilPaint
				6231	Quantize
				6232	Raise
				6233	ReduceNoise
				6234	Roll
				6235	Rotate
				6236	Saturation
				6237	Segment
				6238	Shade
				6239	Sharpen
				6240	Shear
				6241	Solarize
				6242	Spiff
				6243	Spread
				6244	Swirl
				6245	Threshold
				6246	Wave
				6247	</pre>
				6248
				6249	<p>To print a complete list of previews, use the <a href="command-line-options.html#list">-list preview</a> option.</p>
				6250
				6251	<p>The default preview is <code>JPEG</code>.</p>
				6252
				6253	<div style="margin: auto;">
				6254	<h3 class="magick-header"><a id="print"></a>-print <var>string</var></h3>
				6255	</div>
				6256
				6257	<p class="magick-description">interpret string and print to console.</p>
				6258
				6259	<div style="margin: auto;">
				6260	<h3 class="magick-header"><a id="process"></a>-process <var>command</var></h3>
				6261	</div>
				6262
				6263	<p class="magick-description">process the image with a custom image filter.</p>
				6264
				6265	<p>The command arguments has the form <code>"module arg1 arg2 arg3 ...
				6266	argN"</code> where <code>module</code> is the name of the module to invoke (e.g.
				6267	"Analyze") and arg1 arg2 arg3 ... argN are an arbitrary number of arguments to
				6268	pass to the process module.</p>
				6269
				6270	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6271	<h3 class="magick-header"><a id="profile"></a>-profile <var>filename</var><br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6272	+profile <var>profile_name</var></h3>
				6273	</div>
				6274
				6275	<p class="magick-description">Manage ICM, IPTC, or generic profiles in an image.</p>
				6276
				6277	<p>Using <a href="command-line-options.html#profile">-profile</a> <var>filename</var> adds an
				6278	ICM (ICC color management), IPTC (newswire information), or a generic profile
				6279	to the image.</p>
				6280
				6281	<p>Use <a href="command-line-options.html#profile">+profile <var>profile_name</var></a> to
				6282	remove the indicated profile. ImageMagick uses standard filename globbing, so
				6283	wildcard expressions may be used to remove more than one profile. Here we
				6284	remove all profiles from the image except for the XMP profile: <code>+profile
				6285	"!xmp,*"</code>. </p>
				6286
				6287	<p>Use <code>identify -verbose</code> to find out which profiles are in the
				6288	image file. Use <a href="command-line-options.html#strip">-strip</a> to remove all profiles (and
				6289	comments).</p>
				6290
				6291	<p>To extract a profile, the <a href="command-line-options.html#profile">-profile</a> option is not
				6292	used. Instead, simply write the file to an image format such as <var>APP1, 8BIM, ICM,</var> or <var>IPTC</var>.</p>
				6293
				6294	<p>For example, to extract the Exif data (which is stored in JPEG files in the
				6295	<var>APP1</var> profile), use.</p>
				6296
				6297	<pre>
				6298	convert cockatoo.jpg profile.exif
				6299	</pre>
				6300
				6301	<p>It is important to note that results may depend on whether or not the
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6302	original image already has an included profile. Also, keep in mind that <a
				6303	href="command-line-options.html#profile">-profile</a> is an "operator" (as opposed to a "setting") and
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6304	therefore a conversion is made each time it is encountered, in order, in the
				6305	command-line. For instance, in the following example, if the original image is
				6306	CMYK with profile, a CMYK-CMYK-RGB conversion results.</p>
				6307
				6308	<pre>
				6309	convert CMYK.tif -profile "CMYK.icc" -profile "RGB.icc" RGB.tiff
				6310	</pre>
				6311
				6312	<p>Furthermore, since ICC profiles are not necessarily symmetric, extra
				6313	conversion steps can yield unwanted results. CMYK profiles are often very
				6314	asymmetric since they involve 3−>4 and 4−>3 channel mapping.
				6315	</p>
				6316
				6317	<div style="margin: auto;">
				6318	<h3 class="magick-header"><a id="quality"></a>-quality <var>value</var></h3>
				6319	</div>
				6320
				6321	<p class="magick-description">JPEG/MIFF/PNG compression level.</p>
				6322
				6323	<p>For the JPEG and MPEG image formats, quality is 1 (lowest image quality and
				6324	highest compression) to 100 (best quality but least effective compression).
				6325	The default is to use the estimated quality of your input image if it can
				6326	be determined, otherwise 92. When the quality is greater than 90, then the
				6327	chroma channels are not downsampled.
				6328	Use the <a href="command-line-options.html#sampling-factor">-sampling-factor</a> option to specify the
				6329	factors for chroma downsampling.</p>
				6330
				6331	<p>For the JPEG-2000 image format, quality is mapped using a non-linear
				6332	equation to the compression ratio required by the Jasper library. This
				6333	non-linear equation is intended to loosely approximate the quality provided by
				6334	the JPEG v1 format. The default quality value 100, a request for non-lossy
				6335	compression. A quality of 75 results in a request for 16:1 compression.</p>
				6336
				6337	<p>For the MNG and PNG image formats, the quality value sets the zlib
				6338	compression level (quality / 10) and filter-type (quality % 10). The default
				6339	PNG "quality" is 75, which means compression level 7 with adaptive PNG
				6340	filtering, unless the image has a color map, in which case it means
				6341	compression level 7 with no PNG filtering.</p>
				6342
				6343	<p>For compression level 0 (quality value less than 10), the Huffman-only
				6344	strategy is used, which is fastest but not necessarily the worst
				6345	compression.</p>
				6346
				6347	<p>If filter-type is 4 or less, the specified PNG filter-type is used for
				6348	all scanlines:</p>
				6349
				6350	<dl class="dl-horizontal">
				6351	<dt>0</dt><dd>none</dd>
				6352	<dt>1</dt><dd>sub</dd>
				6353	<dt>2</dt><dd>up</dd>
				6354	<dt>3</dt><dd>average</dd>
				6355	<dt>4</dt><dd>Paeth</dd>
				6356	</dl>
				6357
				6358	<p>If filter-type is 5, adaptive filtering is used when quality is greater
				6359	than 50 and the image does not have a color map, otherwise no filtering is
				6360	used.</p>
				6361
				6362	<p>If filter-type is 6, adaptive filtering
				6363	with <var>minimum-sum-of-absolute-values</var> is used.</p>
				6364
				6365	<p>Only if the output is MNG, if filter-type is 7, the LOCO color
				6366	transformation (intrapixel differencing) and adaptive filtering
				6367	with <var>minimum-sum-of-absolute-values</var> are used.</p>
				6368
				6369	<p>If the filter-type is 8 the zlib Z_RLE compression strategy (or the
				6370	Z_HUFFMAN_ONLY strategy, when compression level is 0) is used with
				6371	adaptive PNG filtering.</p>
				6372
				6373	<p>If the filter-type is 9 the zlib Z_RLE compression strategy (or the
				6374	Z_HUFFMAN_ONLY strategy, when compression level is 0) is used with
				6375	no PNG filtering.</p>
				6376
				6377	<p>The quality setting has no effect on the appearance or signature of PNG
				6378	and MNG images, since the compression is always lossless.</p>
				6379
				6380	<p>Not all combinations of compression level, strategy, and PNG filter type
				6381	can be obtained using the -quality option. For more precise control,
				6382	you can use the PNG:compression-level=N, PNG:compression-strategy=N, and
				6383	PNG:compression-filter=N defines, respectively, instead.
				6384	See <a href="command-line-options.html#define">-define</a>. Values from the defines take precedence
				6385	over values from the -quality option.</p>
				6386
				6387	<p>For further information, see
				6388	the <a href="http://www.w3.org/pub/WWW/TR">PNG</a> specification.</p>
				6389
				6390	<p>For the MIFF and TIFF image formats, quality/10 is the <a href="command-line-options.html#compress">Zip/BZip</a> 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>
				6391
				6392	<p>For the BPG image format, quality/2 is the actual BPG compression level (range from 0 to 51).</p>
				6393
				6394	<div style="margin: auto;">
				6395	<h3 class="magick-header"><a id="quantize"></a>-quantize <var>colorspace</var></h3>
				6396	</div>
				6397
				6398	<p class="magick-description">reduce colors using this colorspace.</p>
				6399
				6400	<p>This setting defines the colorspace used to sort out and reduce the number
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6401	of colors needed by an image (for later dithering) by operators such as <a
				6402	href="command-line-options.html#colors" >-colors</a>, Note that color reduction also happens
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6403	automatically when saving images to color-limited image file formats, such as
				6404	GIF, and PNG8.</p>
				6405
				6406
				6407	<div style="margin: auto;">
				6408	<h3 class="magick-header"><a id="quiet"></a>-quiet</h3>
				6409	</div>
				6410
				6411	<p class="magick-description">suppress all warning messages. Error messages are still reported.</p>
				6412
				6413	<div style="margin: auto;">
				6414	<h3 class="magick-header"><a id="radial-blur"></a>-radial-blur <var>angle</var></h3>
				6415	</div>
				6416
				6417	<p class="magick-description">Blur around the center of the image.</p>
				6418
				6419	<p>Note that this is actually a rotational blur rather than a radial and as
				6420	such actually mis-named. </p>
				6421
				6422	<p>The <a href="command-line-options.html#virtual-pixel">-virtual-pixel</a> setting will determine how
				6423	pixels which are outside the image proper are blurred into the final result.
				6424	</p>
				6425
				6426
				6427	<div style="margin: auto;">
				6428	<h3 class="magick-header"><a id="raise"></a>-raise <var>thickness</var></h3>
				6429	</div>
				6430
				6431	<p class="magick-description">Lighten or darken image edges.</p>
				6432
				6433	<p>This will create a 3-D effect. Use <a href="command-line-options.html#raise">-raise</a> to create
				6434	a raised effect, otherwise use <a href="command-line-options.html#raise">+raise</a>. </p>
				6435
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6436	<p>Unlike the similar <a href="command-line-options.html#frame">-frame</a> option, <a
				6437	href="command-line-options.html#raise">-raise</a> does not alter the dimensions of the image.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6438
				6439	<div style="margin: auto;">
				6440	<h3 class="magick-header"><a id="random-threshold"></a>-random-threshold <var>low</var>x<var>high</var></h3>
				6441	</div>
				6442
				6443	<p class="magick-description">Apply a random threshold to the image.</p>
				6444
				6445	<div style="margin: auto;">
Cristy	e077971	2016-07-30 17:25:22 -0400	[diff] [blame]	6446	<h3 class="magick-header"><a id="read-mask"></a>-read-mask
				6447	<var>filename</var></h3>
				6448	</div>
				6449
				6450	<p class="magick-description">Prevent updates to image pixels specified by the mask.</p>
				6451
				6452	<p>This the same as using a mask used for composite masking operations, with
				6453	grayscale values causing blended updates of the image the mask is attached to.
				6454	</p>
				6455
				6456	<p>Use <a href="command-line-options.html#read-mask">+read-mask</a> to remove the mask from images.</p>
				6457
				6458	<p>Also see <a href="command-line-options.html#clip-mask">-clip-mask</a> which work in the same way,
				6459	but with strict boolean masking. </p>
				6460
				6461	<div style="margin: auto;">
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6462	<h3 class="magick-header"><a id="red-primary"></a>-red-primary <var>x,y</var></h3>
				6463	</div>
				6464
				6465	<p class="magick-description">Set the red chromaticity primary point.</p>
				6466
				6467	<div style="margin: auto;">
				6468	<h3 class="magick-header"><a id="regard-warnings"></a>-regard-warnings</h3>
				6469	</div>
				6470
				6471	<p class="magick-description">Pay attention to warning messages.</p>
				6472
				6473	<p>This option causes some warnings in some image formats to be treated
				6474	as errors. </p>
				6475
				6476	<div style="margin: auto;">
				6477	<h3 class="magick-header"><a id="remap"></a>-remap <var>filename</var></h3>
				6478	</div>
				6479
				6480	<p class="magick-description">Reduce the number of colors in an image to the colors used by this image.</p>
				6481
				6482	<p>If the <a href="command-line-options.html#dither">-dither</a> setting is enabled (the default) then
				6483	the given colors are dithered over the image as necessary, otherwise the closest
				6484	color (in RGB colorspace) is selected to replace that pixel in the image. </p>
				6485
				6486	<p>As a side effect of applying a <a href="command-line-options.html#remap">-remap</a> of colors across all
				6487	images in the current image sequence, all the images will have the same color
				6488	table. That means that when saved to a file format such as GIF, it will use
				6489	that color table as a single common or global color table, for all the images,
				6490	without requiring extra local color tables. </p>
				6491
				6492	<p>Use <a href="command-line-options.html#remap">+remap</a> to reduce all images in the current image
				6493	sequence to use a common color map over all the images. This equivalent to
				6494	appending all the images together (without extra background colors) and color
				6495	reducing those images using <a href="command-line-options.html#colors">-colors</a> with a 256 color
				6496	limit, then <a href="command-line-options.html#remap">-remap</a> those colors over the original list of
				6497	images. This ensures all the images follow a single color map. </p>
				6498
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6499	<p>If the number of colors over all the images is less than 256, then <a
				6500	href="command-line-options.html#remap">+remap</a> should not perform any color reduction or dithering, as
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6501	no color changes are needed. In that case, its only effect is to force the use
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6502	of a global color table. This recommended after using either <a
				6503	href="command-line-options.html#colors">-colors</a> or <a href="command-line-options.html#ordered-dither">-ordered-dither</a> to
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6504	reduce the number of colors in an animated image sequence. </p>
				6505
				6506	<p>Note, the remap image colormap has at most 8-bits of precision. Deeper color maps are automagically coalesced with other colors to meet this requirement.</p>
				6507
				6508	<div style="margin: auto;">
				6509	<h3 class="magick-header"><a id="region"></a>-region <var>geometry</var></h3>
				6510	</div>
				6511
				6512	<p class="magick-description">Set a region in which subsequent operations apply.</p>
				6513
				6514	<p>The <var>x</var> and <var>y</var> offsets are treated
				6515	in the same manner as in <a href="command-line-options.html#crop">-crop</a>.</p>
				6516
				6517	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				6518
				6519	<p>Use <code>+region</code> to remove any previously set regions.</p>
				6520
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6521	<div style="margin: auto;">
				6522	<h3 class="magick-header"><a id="remote"></a>-remote</h3>
				6523	</div>
				6524
				6525	<p class="magick-description">perform a remote operation.</p>
				6526
				6527	<p>The only command recognized is the name of an image file to load.</p>
				6528
				6529	<p>If you have more than one <a href="display.html">display</a> application
				6530	running simultaneously, use the <a href="command-line-options.html#window"> window</a> option to
				6531	specify which application to control.</p>
				6532
				6533	<div style="margin: auto;">
				6534	<h3 class="magick-header"><a id="render"></a>-render</h3>
				6535	</div>
				6536
				6537	<p class="magick-description">render vector operations.</p>
				6538
				6539	<p>Use <a href="command-line-options.html#render">+render</a> to turn off rendering vector operations.
				6540	This useful when saving the result to vector formats such as MVG or SVG.</p>
				6541
				6542	<div style="margin: auto;">
				6543	<h3 class="magick-header"><a id="repage"></a>-repage <var>geometry</var></h3>
				6544	</div>
				6545
				6546	<p class="magick-description">Adjust the canvas and offset information of the image.</p>
				6547
				6548	<p>This option is like <a href="command-line-options.html#page">-page</a> but acts as an image operator
				6549	rather than a setting. You can separately set the canvas size or the offset
				6550	of the image on that canvas by only providing those components. </p>
				6551
				6552	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				6553
				6554	<p>If a <code>!</code> flag is given the offset given is added to the existing
				6555	offset to move the image relative to its previous position. This useful for
				6556	animation sequences. </p>
				6557
				6558	<p>A given a canvas size of zero such as '<code>0x0</code>' forces it to
				6559	recalculate the canvas size so the image (at its current offset) will appear
				6560	completely on that canvas (unless it has a negative offset).</p>
				6561
				6562	<p>Use <a href="command-line-options.html#repage">+repage</a> to completely remove/reset the virtual
				6563	canvas meta-data from the images. </p>
				6564
				6565	<p>The <a href="command-line-options.html#set">-set</a> '<code>page</code>' option can be used to
				6566	directly assign virtual canvas meta-data. </p>
				6567
				6568
				6569	<div style="margin: auto;">
				6570	<h3 class="magick-header"><a id="resample"></a>-resample <var>horizontal</var>x<var>vertical</var></h3>
				6571	</div>
				6572
				6573	<p class="magick-description">Resample image to specified horizontal and vertical resolution.</p>
				6574
				6575	<p>Resize the image so that its rendered size remains the same as the original
				6576	at the specified target resolution. For example, if a 300 DPI image renders at
				6577	3 inches by 2 inches on a 300 DPI device, when the image has been resampled to
				6578	72 DPI, it will render at 3 inches by 2 inches on a 72 DPI device. Note that
				6579	only a small number of image formats (e.g. JPEG, PNG, and TIFF) are capable of
				6580	storing the image resolution. For formats which do not support an image
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6581	resolution, the original resolution of the image must be specified via <a
				6582	href="command-line-options.html#density">-density</a> on the command line prior to specifying the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6583	resample resolution.</p>
				6584
				6585	<p>Note that Photoshop stores and obtains image resolution from a proprietary
				6586	embedded profile. If this profile exists in the image, then Photoshop will
				6587	continue to treat the image using its former resolution, ignoring the image
				6588	resolution specified in the standard file header.</p>
				6589
				6590	<div style="margin: auto;">
				6591	<h3 class="magick-header"><a id="resize"></a>-resize <var>geometry</var></h3>
				6592	</div>
				6593
				6594	<p class="magick-description">Resize an image.</p>
				6595
				6596	<p>See <a href="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
				6597	ignored, and the <a href="command-line-options.html#gravity">-gravity</a> option has no effect.</p>
				6598
				6599	<p>If the <a href="command-line-options.html#filter">-filter</a> option
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6600	or <code>-define filter:option=value</code> precedes the <a
				6601	href="command-line-options.html#resize">-resize</a> option, the image is resized with the specified
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6602	filter.</p>
				6603
				6604	<p>Many image processing algorithms assume your image is in a linear-light
				6605	coding. If your image is gamma-corrected, you can remove the nonlinear gamma
				6606	correction, apply the transform, then restore it like this:</p>
				6607
				6608	<pre>
				6609	convert portrait.jpg -gamma .45455 -resize 25% -gamma 2.2 \
				6610	-quality 92 passport.jpg
				6611	</pre>
				6612
				6613	<div style="margin: auto;">
				6614	<h3 class="magick-header"><a id="respect-parentheses"></a>-respect-parentheses</h3>
				6615	</div>
				6616
				6617	<p class="magick-description">settings remain in effect until parenthesis boundary.</p>
				6618
				6619	<div style="margin: auto;">
				6620	<h3 class="magick-header"><a id="reverse"></a>-reverse</h3>
				6621	</div>
				6622
				6623	<p class="magick-description">Reverse the order of images in the current image list.</p>
				6624
				6625
				6626	<div style="margin: auto;">
				6627	<h3 class="magick-header"><a id="roll"></a>-roll {<var>+-</var>}<var>x</var>{<var>+-</var>}<var>y</var></h3>
				6628	</div>
				6629
				6630	<p class="magick-description">roll an image vertically or horizontally by the amount given.</p>
				6631
				6632	<p>A negative <var>x</var> offset rolls the image right-to-left.
				6633	A negative <var>y</var> offset rolls the image bottom-to-top.</p>
				6634
				6635
				6636	<div style="margin: auto;">
				6637	<h3 class="magick-header"><a id="rotate"></a>-rotate <var>degrees</var>{<var><</var>}{<var>></var>}</h3>
				6638	</div>
				6639
				6640	<p class="magick-description">Apply Paeth image rotation (using shear operations) to the image.</p>
				6641
				6642	<p>Use <code>></code> to rotate the image only if its width exceeds the
				6643	height. <code><</code> rotates the image <var>only</var> if its width is less
				6644	than the height. For example, if you specify <code>-rotate "-90>"</code> and
				6645	the image size is 480x640, the image is not rotated. However, if the image is
				6646	640x480, it is rotated by -90 degrees. If you use <code>></code> or
				6647	<code><</code>, enclose it in quotation marks to prevent it from being
				6648	misinterpreted as a file redirection.</p>
				6649
				6650	<p>Empty triangles in the corners, left over from rotating the image, are
				6651	filled with the <code>background</code> color. </p>
				6652
				6653	<p>See also the <a href="command-line-options.html#distort">-distort</a> operator and specifically the
				6654	'<code>ScaleRotateTranslate</code>' distort method. </p>
				6655
				6656
				6657	<div style="margin: auto;">
				6658	<h3 class="magick-header"><a id="sample"></a>-sample <var>geometry</var></h3>
				6659	</div>
				6660
				6661	<p class="magick-description">minify / magnify the image with pixel subsampling and pixel replication, respectively.</p>
				6662
				6663	<p>Change the image size simply by directly sampling the pixels original
				6664	from the image. When magnifying, pixels are replicated in blocks. When
				6665	minifying, pixels are sub-sampled (i.e., some rows and columns are skipped
				6666	over). </p>
				6667
				6668	<p>The results are thus equivalent to using <a href="command-line-options.html#resize">-resize</a> with
				6669	a <a href="command-line-options.html#filter">-filter</a> setting of <code>point</code> (nearest
				6670	neighbor), though <a href="command-line-options.html#sample">-sample</a> is a lot faster, as it
				6671	avoids all the filter processing of the image. As such it completely ignores
				6672	the current <a href="command-line-options.html#filter">-filter</a> setting. </p>
				6673
				6674	<p>The key feature of the <a href="command-line-options.html#sample">-sample</a> is that no new colors
				6675	will be added to the resulting image, though some colors may disappear. </p>
				6676
				6677	<p>See <a href="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
				6678	ignored, unlike <a href="command-line-options.html#resize">-resize</a>. </p>
				6679
				6680
				6681	<p>The actual sampling point is the middle of the sub-region being sampled.
				6682	As such a single pixel sampling of an image will take the middle pixel, (or
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6683	top-left-middle if image has even dimensions). However the <a
				6684	href="command-line-options.html#define">-define</a> '<code>sample:offset</code>' can be set to modify
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6685	this position some other location within each sub-region being sampled, as
				6686	a percentage offset.</p>
				6687
				6688	<p>By default this value is '<code>50</code>' for the midpoint, but could be set
				6689	to '<code>0</code>' for top-left, '<code>100</code>' for bottom-right, or with
				6690	separate X and Y offsets such as '<code>0x50</code>' for left-middle edge of
				6691	sampling sub-region.</p>
				6692
				6693
				6694	<div style="margin: auto;">
				6695	<h3 class="magick-header"><a id="sampling-factor"></a>-sampling-factor <var>horizontal-factor</var>x<var>vertical-factor</var></h3>
				6696	</div>
				6697
				6698	<p class="magick-description">sampling factors used by JPEG or MPEG-2 encoder and YUV decoder/encoder.</p>
				6699
				6700	<p>This option specifies the sampling factors to be used by the JPEG encoder
				6701	for chroma downsampling. If this option is omitted, the JPEG library will use
				6702	its own default values. When reading or writing the YUV format and when
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6703	writing the M2V (MPEG-2) format, use <a
				6704	href="command-line-options.html#sampling-factor">-sampling-factor 2x1</a> or <a
				6705	href="command-line-options.html#sampling-factor">-sampling-factor 4:2:2</a> to specify the 4:2:2
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6706	downsampling method.</p>
				6707
				6708	<div style="margin: auto;">
				6709	<h3 class="magick-header"><a id="scale"></a>-scale <var>geometry</var></h3>
				6710	</div>
				6711
				6712	<p class="magick-description">minify / magnify the image with pixel block averaging and pixel replication, respectively.</p>
				6713
				6714	<p>Change the image size simply by replacing pixels by averaging pixels
				6715	together when minifying, or replacing pixels when magnifying. </p>
				6716
				6717	<p>The results are thus equivalent to using <a href="command-line-options.html#resize">-resize</a> with
				6718	a <a href="command-line-options.html#filter">-filter</a> setting of <code>box</code>. Though it is a lot
				6719	faster, as it avoids all the filter processing of the image. As such it
				6720	completely ignores the current <a href="command-line-options.html#filter">-filter</a> setting. </p>
				6721
				6722	<p>If when shrinking (minifying) images the original image is some integer
				6723	multiple of the new image size, the number of pixels averaged together to
				6724	produce the new pixel color is the same across the whole image. This is
				6725	a special case known as 'binning' and is often used as a method of reducing
				6726	noise in image such as those generated by digital cameras, especially in low
				6727	light conditions. </p>
				6728
				6729
				6730	<div style="margin: auto;">
				6731	<h3 class="magick-header"><a id="scene"></a>-scene <var>value</var></h3>
				6732	</div>
				6733
				6734	<p class="magick-description">set scene number.</p>
				6735
				6736	<p>This option sets the scene number of an image or the first image in an image sequence.</p>
				6737
				6738	<div style="margin: auto;">
				6739	<h3 class="magick-header"><a id="screen"></a>-screen</h3>
				6740	</div>
				6741
				6742	<p class="magick-description">specify the screen to capture.</p>
				6743
				6744	<p>This option indicates that the GetImage request used to obtain the image
				6745	should be done on the root window, rather than directly on the specified
				6746	window. In this way, you can obtain pieces of other windows that overlap the
				6747	specified window, and more importantly, you can capture menus or other popups
				6748	that are independent windows but appear over the specified window.</p>
				6749
				6750	<div style="margin: auto;">
				6751	<h3 class="magick-header"><a id="seed"></a>-seed</h3>
				6752	</div>
				6753
				6754	<p class="magick-description">seed a new sequence of pseudo-random numbers</p>
				6755
				6756	<div style="margin: auto;">
				6757	<h3 class="magick-header"><a id="segment"></a>-segment <var>cluster-threshold</var>x<var>smoothing-threshold</var></h3>
				6758	</div>
				6759
				6760	<p class="magick-description">segment the colors of an image.</p>
				6761
				6762	<p>Segment an image by analyzing the histograms of the color components and
				6763	identifying units that are homogeneous with the fuzzy c-means technique. This
				6764	is part of the ImageMagick color quantization routines. </p>
				6765
				6766	<p>Specify <var>cluster threshold</var> as the number of pixels in
				6767	each cluster that must exceed the cluster threshold to be considered valid.
				6768	<var>Smoothing threshold</var> eliminates noise in the second
				6769	derivative of the histogram. As the value is increased, you can expect
				6770	a smoother second derivative. The default is 1.5.</p>
				6771
				6772	<p>If the <a href="command-line-options.html#verbose">-verbose</a> setting is defined, a detailed report
				6773	of the color clusters is returned.</p>
				6774
				6775
				6776	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6777	<h3 class="magick-header"><a id="selective-blur"></a>-selective-blur <var>radius</var><br />-selective-blur <var>radius</var>x<var>sigma</var>{<var>+threshold</var>}</h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6778	</div>
				6779
				6780	<p class="magick-description">Selectively blur pixels within a contrast threshold.</p>
				6781
				6782	<p>Blurs those pixels that are less than or equal to the threshold in
				6783	contrast. The threshold may be expressed as a fraction of <var>QuantumRange</var> or as a percentage.</p>
				6784
				6785	<div style="margin: auto;">
				6786	<h3 class="magick-header"><a id="separate"></a>-separate</h3>
				6787	</div>
				6788
				6789	<p class="magick-description">separate an image channel into a grayscale image. Specify the channel with <a href="command-line-options.html#channel">-channel</a>.</p>
				6790
				6791	<div style="margin: auto;">
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	6792	<h3 class="magick-header"><a id="sepia-tone"></a>-sepia-tone <var>percent-threshold</var></h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6793	</div>
				6794
				6795	<p class="magick-description">simulate a sepia-toned photo.</p>
				6796
				6797	<p>Specify <var>threshold</var> as the percent threshold of the intensity (0 - 99.9%).</p>
				6798
				6799	<p>This option applies a special effect to the image, similar to the effect
				6800	achieved in a photo darkroom by sepia toning. Threshold ranges from 0 to <var>QuantumRange</var> and is a measure of the extent of the sepia
				6801	toning. A threshold of 80% is a good starting point for a reasonable
				6802	tone.</p>
				6803
				6804
				6805
				6806	<div style="margin: auto;">
				6807	<h3 class="magick-header"><a id="set"></a>-set <var>key value</var></h3>
				6808	<h3 class="magick-header">+set <var>key</var></h3>
				6809	</div>
				6810
				6811	<p class="magick-description">sets image attributes and properties for images in the current image sequence.</p>
				6812
				6813	<p>This will assign (or modify) specific settings attached to all the images
				6814	in the current image sequence. Using the <a href="command-line-options.html#set">+set</a> form of the
				6815	option will either remove, or reset that setting to a default state, as
				6816	appropriate. </p>
				6817
				6818	<p>For example, it will modify specific well known image meta-data
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6819	'attributes' such as those normally overridden by: the options <a
				6820	href="command-line-options.html#delay" >-delay</a>, <a href="command-line-options.html#dispose" >-dispose</a>, and <a
				6821	href="command-line-options.html#page" >-page</a>, <a href="command-line-options.html#colorspace" >-colorspace</a>; generally
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6822	assigned before the image is read in, by using a <var>key</var> of
				6823	the same name. </p>
				6824
				6825	<p>If the given <var>key</var> does not match a specific known
				6826	'attribute ', such as shown above, the setting is stored as a a free form
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6827	'property' string. Such settings are listed in <a href="command-line-options.html#verbose"
				6828	>-verbose</a> information ("<code>info:</code>" output format) as "Properties".
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6829	</p>
				6830
				6831	<p>This includes string 'properties' that are set by and assigned to images
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6832	using the options <a href="command-line-options.html#comment" >-comment</a>, <a href="command-line-options.html#label"
				6833	>-label</a>, <a href="command-line-options.html#caption" >-caption</a>. These options actually assign
				6834	a global 'artifact' which are automatically assigned (and any <a href="escape.html" >Format Percent
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6835	Escapes</a> expanded) to images as they are read in. For example:</p>
				6836
				6837	<pre>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6838	-> convert rose: -set comment 'Rose is a rose is a rose is a rose' rose.png
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6839	identify -format %c rose.png
				6840	Rose is a rose is a rose is a rose
				6841	</pre>
				6842
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6843	<p>The set value can also make use of <a href="escape.html" >Format and Print Image
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6844	Properties</a> in the defined value. For example:</p>
				6845
				6846	<pre>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6847	-> convert rose: -set origsize '%wx%h' -resize 50% \
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6848	-format 'Old size = %[origsize] New size = %wx%h' info:
				6849	Old size = 70x46 New size = 35x23
				6850	</pre>
				6851
				6852	<p>Other well known 'properties' that are available include:
				6853	'<code>date:create</code>' and '<code>date:modify</code>' and
				6854	'<code>signature</code>'. </p>
				6855
				6856	<p>The <a href="command-line-options.html#repage">-repage</a> operator will also allow you to modify
				6857	the '<code>page</code>' attribute of an image for images already in memory (also
				6858	see <a href="command-line-options.html#repage">-page</a>). However it is designed to provide a finer
				6859	control of the sub-parts of this 'attribute'. The <a href="command-line-options.html#set">-set page</a>
				6860	option will only provide a direct, unmodified assignment of '<code>page</code>'
				6861	attribute. </p>
				6862
				6863	<p>This option can also associate a colorspace or profile with your image.
				6864	For example,</p>
				6865
				6866	<pre>
				6867	convert image.psd -set profile ISOcoated_v2_eci.icc image-icc.psd
				6868	</pre>
				6869
				6870	<p>Some 'properties' must be defined in a specific way to be used. For
				6871	example only 'properties' prefixed with "<code>filename:</code>" can be used to
				6872	modify the output filename of an image. For example</p>
				6873
				6874	<pre>
				6875	convert rose: -set filename:mysize '%wx%h' 'rose_%[filename:mysize].png'
				6876	</pre>
				6877
				6878	<p>If the setting value is prefixed with "<code>option:</code>" the setting will
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6879	be saved as a global "Artifact" exactly as if it was set using the <a
				6880	href="command-line-options.html#define" >-define</a> option. As such settings are global in scope, they
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6881	can be used to pass 'attributes' and 'properties' of one specific image,
				6882	in a way that allows you to use them in a completely different image, even if
				6883	the original image has long since been modified or destroyed. For example: </p>
				6884
				6885	<pre>
				6886	convert rose: -set option:rosesize '%wx%h' -delete 0 \
				6887	label:'%[rosesize]' label_size_of_rose.gif"
				6888	</pre>
				6889
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6890	<p>Note that <a href="escape.html" >Format Percent Escapes</a> will only match
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6891	a 'artifact' if the given <var>key</var> does not match an existing
				6892	'attribute' or 'property'. </p>
				6893
				6894	<p>You can set the attributes of the image registry by prefixing the value
				6895	with <code>registry:</code>.</p>
				6896
				6897	<p>The <a href="command-line-options.html#set">-set profile</a> option can also be used to inject
				6898	previously-formatted ancillary chunks into the output PNG file, using
				6899	the commandline option as shown below or by setting the profile via a
				6900	programming interface:</p>
				6901
				6902	<pre>
				6903	convert in.png -set profile PNG-chunk-x:<filename> out.png
				6904	</pre>
				6905
				6906	<p>where <var>x</var> is a location flag and
				6907	<var>filename</var> is a file containing the chunk
				6908	name in the first 4 bytes, then a colon (":"), followed by the chunk data.
				6909	This encoder will compute the chunk length and CRC, so those must not
				6910	be included in the file.</p>
				6911
				6912	<p>"x" can be "b" (before PLTE), "m" (middle, i.e., between PLTE and IDAT),
				6913	or "e" (end, i.e., after IDAT). If you want to write multiple chunks
				6914	of the same type, then add a short unique string after the "x" to prevent
				6915	subsequent profiles from overwriting the preceding ones, e.g.,</p>
				6916
				6917
				6918	<pre>
				6919	convert in.png -set profile PNG-chunk-b01:file01 \
				6920	-profile PNG-chunk-b02:file02 out.png
				6921	</pre>
				6922
				6923	<div style="margin: auto;">
				6924	<h3 class="magick-header"><a id="shade"></a>-shade <var>azimuth</var>x<var>elevation</var></h3>
				6925	</div>
				6926
				6927	<p class="magick-description">shade the image using a distant light source.</p>
				6928
				6929	<p>Specify <var>azimuth</var> and <var>elevation</var> as
				6930	the position of the light source. Use <a href="command-line-options.html#shade">+shade</a> to return
				6931	the shading results as a grayscale image.</p>
				6932
				6933	<div style="margin: auto;">
				6934	<h3 class="magick-header"><a id="shadow"></a>-shadow <var>percent-opacity</var>{x<var>sigma</var>}{<var>+-</var>}<var>x</var>{<var>+-</var>}<var>y</var>{<var>%</var>}</h3>
				6935	</div>
				6936
				6937	<p class="magick-description">simulate an image shadow.</p>
				6938
				6939	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6940	<h3 class="magick-header"><a
				6941	id="shared-memory"></a>-shared-memory</h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6942	</div>
				6943
				6944	<p class="magick-description">use shared memory.</p>
				6945
				6946	<p>This option specifies whether the utility should attempt to use shared
				6947	memory for pixmaps. ImageMagick must be compiled with shared memory support,
				6948	and the display must support the <var>MIT-SHM</var> extension.
				6949	Otherwise, this option is ignored. The default is <code>True</code>.</p>
				6950
				6951	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6952	<h3 class="magick-header"><a id="sharpen"></a>-sharpen <var>radius</var><br />-sharpen <var>radius</var>x<var>sigma</var></h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6953	</div>
				6954
				6955	<p class="magick-description">sharpen the image.</p>
				6956
				6957	<p>Use a Gaussian operator of the given radius and standard deviation (sigma).</p>
				6958
				6959	<div style="margin: auto;">
				6960	<h3 class="magick-header"><a id="shave"></a>-shave <var>geometry</var></h3>
				6961	</div>
				6962
				6963	<p class="magick-description">Shave pixels from the image edges.</p>
				6964
				6965	<p>The <var>size</var> portion of the <var>geometry</var>
				6966	argument specifies the width of the region to be removed from both sides of
				6967	the image and the height of the regions to be removed from top and bottom.
				6968	Offsets are ignored.</p>
				6969
				6970	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				6971
				6972	<div style="margin: auto;">
				6973	<h3 class="magick-header"><a id="shear"></a>-shear <var>Xdegrees</var>[x<var>Ydegrees</var>]</h3>
				6974	</div>
				6975
				6976	<p class="magick-description">Shear the image along the x-axis and/or y-axis.</p>
				6977
				6978	<p>The shear angles may be positive, negative, or zero. When <var>Ydegrees</var> is omitted it defaults to 0. When both angles are
				6979	given, the horizontal component of the shear is performed before the vertical
				6980	component.</p>
				6981
				6982	<p>Shearing slides one edge of an image along the x-axis or y-axis (i.e.,
				6983	horizontally or vertically, respectively),creating a parallelogram. The amount
				6984	of each is controlled by the respective shear angle. For horizontal shears,
				6985	<var>Xdegrees</var> is measured clockwise relative to "up" (the
				6986	negative y-axis), sliding the top edge to the right when 0°<<var>Xdegrees</var><90° and to the left when 90°<<var>Xdegrees</var><180°. For vertical shears <var>Ydegrees</var> is measured clockwise relative to "right" (the
				6987	positive x-axis), sliding the right edge down when 0°<<var>Ydegrees</var><90° and up when 90°<<var>Ydegrees</var><180°.</p>
				6988
				6989	<p>Empty triangles left over from shearing the image are filled with the color
				6990	defined by the <a href="command-line-options.html#fill">-background</a> option. The color is specified
				6991	using the format described under the <a href="command-line-options.html#fill">-fill</a> option.</p>
				6992
				6993	<p>The horizontal shear is performed before the vertical part. This is
				6994	important to note, since horizontal and vertical shears do not
				6995	<var>commute</var>, i.e., the order matters in a sequence of shears. For
				6996	example, the following two commands are not equivalent.</p>
				6997
				6998	<pre>
				6999	convert logo: -shear 20x0 -shear 0x60 logo-sheared.png
				7000	convert logo: -shear 0x60 -shear 20x0 logo-sheared.png
				7001	</pre>
				7002
				7003	<p>The first of the two commands above is equivalent to the following, except
				7004	for the amount of empty space created; the command that follows generates
				7005	a smaller image, and so is a better choice in terms of time and space.</p>
				7006
				7007	<pre>
				7008	convert logo: -shear 20x60 logo-sheared.png
				7009	</pre>
				7010
				7011	<div style="margin: auto;">
				7012	<h3 class="magick-header"><a id="sigmoidal-contrast"></a>-sigmoidal-contrast <var>contrast</var>x<var>mid-point</var></h3>
				7013	</div>
				7014
				7015	<p class="magick-description">increase the contrast without saturating highlights or shadows.</p>
				7016
				7017	<p>Increase the contrast of the image using a sigmoidal transfer function
				7018	without saturating highlights or shadows. <var>Contrast</var>
				7019	indicates how much to increase the contrast. For example, 0 is none, 3 is
				7020	typical and 20 is a lot.
				7021	</p>
				7022
				7023	<p>The <var>mid-point</var> indicates where the maximum change
				7024	'slope' in contrast should fall in the resultant image (0 is white; 50% is
				7025	middle-gray; 100% is black). </p>
				7026
				7027	<p>By default the image contrast is increased, use <var>+sigmoidal-contrast</var> to decrease the contrast.</p>
				7028
				7029	<p>To achieve the equivalent of a sigmoidal brightness change (similar to
				7030	a gamma adjustment), you would use <var>-sigmoidal-contrast
				7031	{brightness}x0%</var> to increase brightness and <var>+sigmoidal-contrast {brightness}x0%</var> to decrease brightness.
				7032	Note the use of '0' fo rthe mid-point of the sigmoidal curve. </p>
				7033
				7034	<p>Using a very high <var>contrast</var> will produce a sort of
				7035	'smoothed thresholding' of the image. Not as sharp (with high aliasing
				7036	effects) of a true threshold, but with tapered gray-levels around the threshold
				7037	<var>mid-point</var>. </p>
				7038
				7039	<div style="margin: auto;">
				7040	<h3 class="magick-header"><a id="silent"></a>-silent</h3>
Cristy	f650f4f	2016-04-01 10:53:07 -0400	[diff] [blame]	7041
				7042
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7043	</div>
				7044
Cristy	f650f4f	2016-04-01 10:53:07 -0400	[diff] [blame]	7045	<p class="magick-description">operate silently. This option is only used
				7046	by the <a href="import.html">import</a> tool.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7047
				7048	<div style="margin: auto;">
				7049	<h3 class="magick-header"><a id="similarity-threshold"></a>-similarity-threshold <var>value</var></h3>
				7050	</div>
				7051
				7052	<p class="magick-description">minimum RMSE for subimage match.</p>
				7053
				7054	<p>If this setting is used, then the search will stop as soon as it finds a match whose metric is less than or equal to the value. A partially filled second output image will result. Using a value of zero, will cause the search to stop at the first perfect match it finds. If this setting is left off, then the search will proceed to completion or as limited by <var>-dissimilarity-threshold</var>.</p>
				7055
				7056	<div style="margin: auto;">
				7057	<h3 class="magick-header"><a id="size"></a>-size <var>width</var>[x<var>height</var>][<var>+offset</var>]</h3>
				7058	</div>
				7059
				7060	<p class="magick-description">set the width and height of the image.</p>
				7061
				7062	<p>Use this option to specify the width and height of raw images whose
				7063	dimensions are unknown such as <code>GRAY</code>, <code>RGB</code>, or
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7064	<code>CMYK</code>. In addition to width and height, use <a
				7065	href="command-line-options.html#size">-size</a> with an offset to skip any header information in the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7066	image or tell the number of colors in a <code>MAP</code> image file, (e.g. -size
				7067	640x512+256).</p>
				7068
				7069	<p>For Photo CD images, choose from these sizes:</p>
				7070
				7071	<pre>
				7072	192x128
				7073	384x256
				7074	768x512
				7075	1536x1024
				7076	3072x2048
				7077	</pre>
				7078
				7079	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7080	<h3 class="magick-header"><a id="sketch"></a>-sketch <var>radius</var><br />-sketch <var>radius</var>x<var>sigma</var>+<var>angle</var></h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7081	</div>
				7082
				7083	<p class="magick-description">simulate a pencil sketch.</p>
				7084
				7085	<p>Sketch with the given radius, standard deviation (sigma), and angle. The
				7086	angle given is the angle toward which the image is sketched. That is the
				7087	direction people would consider the object is coming from. </p>
				7088
				7089	<div style="margin: auto;">
				7090	<h3 class="magick-header"><a id="smush"></a>-smush <var>offset</var></h3>
				7091	</div>
				7092
				7093	<p class="magick-description">smush an image sequence together.</p>
				7094
				7095	<div style="margin: auto;">
				7096	<h3 class="magick-header"><a id="snaps"></a>-snaps <var>value</var></h3>
				7097	</div>
				7098
				7099	<p class="magick-description">Set the number of screen snapshots.</p>
				7100
				7101	<p>Use this option to grab more than one image from the X server screen, to create an animation sequence.</p>
				7102
				7103	<div style="margin: auto;">
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	7104	<h3 class="magick-header"><a id="solarize"></a>-solarize <var>percent-threshold</var></h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7105	</div>
				7106
				7107	<p class="magick-description">negate all pixels above the threshold level.</p>
				7108
				7109	<p>Specify <var>factor</var> as the percent threshold of the intensity (0 - 99.9%).</p>
				7110
				7111	<p>This option produces a <var>solarization</var> effect seen when
				7112	exposing a photographic film to light during the development process.</p>
				7113
				7114	<div style="margin: auto;">
				7115	<h3 class="magick-header"><a id="sparse-color"></a>-sparse-color <var>method</var> '<var>x</var>,<var>y</var> <var>color</var> ...'</h3>
				7116	</div>
				7117
				7118	<p class="magick-description"> color the given image using the specified points of color, and filling the other intervening colors using the given methods. </p>
				7119
				7120
				7121	<dl class="dl-horizontal">
				7122	<dt>barycentric</dt>
				7123	<dd>three point triangle of color given 3 points.
				7124	Giving only 2 points will form a linear gradient between those points.
				7125	The gradient generated extends beyond the triangle created by those
				7126	3 points. </dd>
				7127	<dt>bilinear</dt>
				7128	<dd>Like barycentric but for 4 points. Less than 4 points
				7129	fall back to barycentric. </dd>
				7130	<dt>voronoi</dt>
				7131	<dd>Simply map each pixel to the to nearest color point
				7132	given. The result are polygonal 'cells' of solid color. </dd>
				7133	<dt>manhatten</dt>
				7134	<dd>Like voronoi, but resulting polygonal 'cells' are mapped to a fixed coordinate system.</dd>
				7135	<dt>shepards</dt>
				7136	<dd>Colors points biased on the ratio of inverse distance
				7137	squared. Generating spots of color in a sea of the average of
				7138	colors. </dd>
				7139	<dt>inverse</dt>
				7140	<dd>Colors points biased on the ratio of inverse distance.
				7141	This generates sharper points of color rather than rounded spots of
				7142	'<code>shepards</code>' Generating spots of color in a sea of the
				7143	average of colors. </dd>
				7144	</dl>
				7145
				7146	<p>The points are placed according to the images location on the virtual
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7147	canvas (<a href="command-line-options.html#page" >-page</a> or <a href="command-line-options.html#repage" >-repage</a>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7148	offset), and do not actually have to exist on the given image, but may be
				7149	some point beyond the edge of the image. All points are floating point values.
				7150	</p>
				7151
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7152	<p>Only the color channels defined by the <a href="command-line-options.html#channel" >-channel</a> are
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7153	modified, which means that by default matte/alpha transparency channel is not
				7154	effected. Typically transparency channel is turned off either before or after
				7155	the operation. </p>
				7156
				7157	<p>Of course if some color points are transparent to generate a transparent
				7158	gradient, then the image also requires transparency enabled to store the
				7159	values. </p>
				7160
				7161	<p>All the above methods when given a single point of color will replace all
				7162	the colors in the image with the color given, regardless of the point. This is
				7163	logical, and provides an alternative technique to recolor an image to some
				7164	default value. </p>
				7165
				7166
				7167	<div style="margin: auto;">
				7168	<h3 class="magick-header"><a id="splice"></a>-splice <var>geometry</var></h3>
				7169	</div>
				7170
				7171	<p class="magick-description">Splice the current background color into the image.</p>
				7172
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7173	<p>This will add rows and columns of the current <a
				7174	href="command-line-options.html#background">-background</a> color into the given image according to the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7175	given <a href="command-line-options.html#gravity">-gravity</a> geometry setting. See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument. Essentially <a href="command-line-options.html#splice">-splice</a> will divide the
				7176	image into four quadrants, separating them by the inserted rows and columns.
				7177	</p>
				7178
				7179	<p>If a dimension of geometry is zero no rows or columns will be added for that
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7180	dimension. Similarly using a zero offset with the appropriate <a
				7181	href="command-line-options.html#gravity">-gravity</a> setting will add rows and columns to the edges of
				7182	the image, padding the image only along that one edge. Edge padding is what <a
				7183	href="command-line-options.html#splice">-splice</a> is most commonly used for. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7184
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7185	<p>If the exact same <var>geometry</var> and <a
				7186	href="command-line-options.html#gravity">-gravity</a> is later used with <a href="command-line-options.html#chop">-chop</a> the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7187	added added all splices removed. </p>
				7188
				7189	<div style="margin: auto;">
				7190	<h3 class="magick-header"><a id="spread"></a>-spread <var>amount</var></h3>
				7191	</div>
				7192
				7193	<p class="magick-description">displace image pixels by a random amount.</p>
				7194
				7195	<p>The argument <var>amount</var> defines the size of the
				7196	neighborhood around each pixel from which to choose a candidate pixel to
				7197	blend.</p>
				7198
				7199	<p>The lookup is controlled by the <a href="command-line-options.html#interpolate">-interpolate</a> setting.</p>
				7200
				7201	<div style="margin: auto;">
				7202	<h3 class="magick-header"><a id="statistic"></a>-statistic <var>type</var> <var>geometry</var></h3>
				7203	</div>
				7204
				7205	<p class="magick-description">replace each pixel with corresponding statistic from the neighborhood.</p>
				7206
				7207	<p>Choose from these statistic types:</p>
				7208	<dl class="dl-horizontal">
				7209	<dt>Gradient</dt><dd>maximum difference (max - min) value in neighborhood</dd>
				7210	<dt>Maximum</dt><dd>maximum value per channel in neighborhood</dd>
				7211	<dt>Minimum</dt><dd>minimum value per channel in neighborhood</dd>
				7212	<dt>Mean</dt><dd>average value per channel in neighborhood</dd>
				7213	<dt>Median</dt><dd>median value per channel in neighborhood</dd>
				7214	<dt>Mode</dt><dd>mode (most frequent) value per channel in neighborhood</dd>
				7215	<dt>Nonpeak</dt><dd>value just before or after the median value per channel in neighborhood</dd>
				7216	<dt>RMS</dt><dd>root mean square value per channel in neighborhood</dd>
				7217	<dt>StandardDeviation</dt><dd> standard deviation value per channel in neighborhood</dd>
				7218	</dl>
				7219
				7220	<div style="margin: auto;">
				7221	<h3 class="magick-header"><a id="stegano"></a>-stegano <var>offset</var></h3>
				7222	</div>
				7223
				7224	<p class="magick-description">hide watermark within an image.</p>
				7225
				7226	<p>Use an offset to start the image hiding some number of pixels from the
				7227	beginning of the image. Note this offset and the image size. You will need
				7228	this information to recover the steganographic image (e.g. display -size
				7229	320x256+35 stegano:image.png).</p>
				7230
				7231	<div style="margin: auto;">
				7232	<h3 class="magick-header"><a id="stereo"></a>-stereo <var>+x</var>{<var>+y</var>}</h3>
				7233	</div>
				7234
				7235	<p class="magick-description">composite two images to create a red / cyan stereo anaglyph.</p>
				7236
				7237	<p>The left side of the stereo pair (second image) is saved as the red channel of the output image. The right side (first image) is saved as the green and blue channels. Red-green stereo glasses are required to properly view the stereo image.</p>
				7238
				7239	<div style="margin: auto;">
				7240	<h3 class="magick-header"><a id="storage-type"></a>-storage-type <var>type</var></h3>
				7241	</div>
				7242
				7243	<p class="magick-description">pixel storage type. Here are the valid types:</p>
				7244
				7245	<dl class="dl-horizontal">
				7246	<dt>char</dt><dd>unsigned characters</dd>
				7247	<dt>double</dt><dd>doubles</dd>
				7248	<dt>float</dt><dd>floats</dd>
				7249	<dt>integer</dt><dd>integers</dd>
				7250	<dt>long</dt><dd>longs</dd>
				7251	<dt>quantum</dt><dd>pixels in the native depth of your ImageMagick distribution</dd>
				7252	<dt>short</dt><dd>unsigned shorts</dd>
				7253	</dl>
				7254
				7255	<p>Float and double types are normalized from 0.0 to 1.0 otherwise the pixels
				7256	values range from 0 to the maximum value the storage type can support.</p>
				7257
				7258	<div style="margin: auto;">
				7259	<h3 class="magick-header"><a id="stretch"></a>-stretch <var>fontStretch</var></h3>
				7260	</div>
				7261
				7262	<p class="magick-description">Set a type of stretch style for fonts.</p>
				7263
				7264	<p>This setting suggests a type of stretch that ImageMagick should try to
				7265	apply to the currently selected font family. Select <var>fontStretch</var> from the following.</p>
				7266
				7267	<pre>
				7268	Any
				7269	Condensed
				7270	Expanded
				7271	ExtraCondensed
				7272	ExtraExpanded
				7273	Normal
				7274	SemiCondensed
				7275	SemiExpanded
				7276	UltraCondensed
				7277	UltraExpanded
				7278	</pre>
				7279
				7280	<p>To print a complete list of stretch types, use <a href="command-line-options.html#list">-list
				7281	stretch</a>.</p>
				7282
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7283	<p>For other settings that affect fonts, see the options <a
				7284	href="command-line-options.html#font">-font</a>, <a href="command-line-options.html#family">-family</a>, <a
				7285	href="command-line-options.html#style">-style</a>, and <a href="command-line-options.html#weight">-weight</a>. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7286
				7287	<div style="margin: auto;">
				7288	<h3 class="magick-header"><a id="strip"></a>-strip</h3>
				7289	</div>
				7290
Cristy	776113a	2016-04-29 12:01:19 -0400	[diff] [blame]	7291	<p class="magick-description">strip the image of any profiles, comments or these PNG chunks: bKGD,cHRM,EXIF,gAMA,iCCP,iTXt,sRGB,tEXt,zCCP,zTXt,date.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7292
				7293	<div style="margin: auto;">
				7294	<h3 class="magick-header"><a id="stroke"></a>-stroke <var>color</var></h3>
				7295	</div>
				7296
				7297	<p class="magick-description">color to use when stroking a graphic primitive.</p>
				7298
				7299	<p>The color is specified using the format described under the <a href="command-line-options.html#fill">-fill</a> option.</p>
				7300
				7301	<p>See <a href="command-line-options.html#draw">-draw</a> for further details.</p>
				7302
				7303	<div style="margin: auto;">
				7304	<h3 class="magick-header"><a id="strokewidth"></a>-strokewidth <var>value</var></h3>
				7305	</div>
				7306
				7307	<p class="magick-description">set the stroke width.</p>
				7308
				7309	<p>See <a href="command-line-options.html#draw">-draw</a> for further details.</p>
				7310
				7311	<div style="margin: auto;">
				7312	<h3 class="magick-header"><a id="style"></a>-style <var>fontStyle</var></h3>
				7313	</div>
				7314
				7315	<p class="magick-description">Set a font style for text.</p>
				7316
				7317	<p>This setting suggests a font style that ImageMagick should try to apply to
				7318	the currently selected font family. Select <var>fontStyle</var> from
				7319	the following.</p>
				7320
				7321	<pre>
				7322	Any
				7323	Italic
				7324	Normal
				7325	Oblique
				7326	</pre>
				7327
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7328	<p>For other settings that affect fonts, see the options <a
				7329	href="command-line-options.html#font">-font</a>, <a href="command-line-options.html#family">-family</a>, <a
				7330	href="command-line-options.html#stretch">-stretch</a>, and <a href="command-line-options.html#weight">-weight</a>. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7331
				7332	<div style="margin: auto;">
				7333	<h3 class="magick-header"><a id="subimage-search"></a>-subimage-search</h3>
				7334	</div>
				7335
				7336	<p class="magick-description">search for subimage.</p>
				7337
				7338	<p>This option is required to have compare search for the best match location
				7339	of a small image within a larger image. This search will produce two images
				7340	(or two frames). The first is the "difference" image and the second will
				7341	be the "match score" image.</p>
				7342
				7343	<p>The "match-score" image is smaller containing a pixel for ever possible
				7344	position of the top-left corner of the given sub-image. that is its size will
				7345	be the size of the larger_image - sub_image + 1. The brightest location in
				7346	this image is the location s the locate on the best match that is also
				7347	reported. Note that this may or may not be a perfect match, and the actual
				7348	brightness will reflect this. Other bright 'peaks' can be used to locate other
				7349	possible matching locations. </p>
				7350
				7351	<p>Note that the search will try to compare the sub-image at every possible
				7352	location in the larger image, as such it can be very slow. The smaller the
				7353	sub-image the faster this search is. </p>
				7354
				7355
				7356	<div style="margin: auto;">
				7357	<h3 class="magick-header"><a id="swap"></a>-swap <var>index,index</var></h3>
				7358	</div>
				7359
				7360	<p class="magick-description">Swap the positions of two images in the image sequence.</p>
				7361
				7362	<p>For example, <a href="command-line-options.html#swap">-swap 0,2</a> swaps the first and the third
				7363	images in the current image sequence. Use <a href="command-line-options.html#swap">+swap</a> to switch
				7364	the last two images in the sequence.</p>
				7365
				7366	<div style="margin: auto;">
				7367	<h3 class="magick-header"><a id="swirl"></a>-swirl <var>degrees</var></h3>
				7368	</div>
				7369
				7370	<p class="magick-description">swirl image pixels about the center.</p>
				7371
				7372	<p><var>Degrees</var> defines the tightness of the swirl.</p>
				7373
				7374	<div style="margin: auto;">
				7375	<h3 class="magick-header"><a id="synchronize"></a>-synchronize</h3>
				7376	</div>
				7377
				7378	<p class="magick-description">synchronize image to storage device.</p>
				7379
				7380	<p>Set to "true" to ensure all image data is fully flushed and synchronized
				7381	to disk. There is a performance penalty, but the benefits include ensuring a
				7382	valid image file in the event of a system crash and early reporting if there
				7383	is not enough disk space for the image pixel cache.</p>
				7384
				7385	<div style="margin: auto;">
				7386	<h3 class="magick-header"><a id="taint"></a>-taint</h3>
				7387	</div>
				7388
				7389	<p class="magick-description">Mark the image as modified.</p>
				7390
				7391	<div style="margin: auto;">
				7392	<h3 class="magick-header"><a id="text-font"></a>-text-font <var>name</var></h3>
				7393	</div>
				7394
				7395	<p class="magick-description">font for writing fixed-width text.</p>
				7396
				7397	<p>Specifies the name of the preferred font to use in fixed (typewriter style)
				7398	formatted text. The default is 14 point <var>Courier</var>.</p>
				7399
				7400	<p>You can tag a font to specify whether it is a PostScript, TrueType, or
				7401	OPTION1 font. For example, <code>Courier.ttf</code> is a TrueType font and
				7402	<code>x:fixed</code> is OPTION1.</p>
				7403
				7404	<div style="margin: auto;">
				7405	<h3 class="magick-header"><a id="texture"></a>-texture <var>filename</var></h3>
				7406	</div>
				7407
				7408	<p class="magick-description">name of texture to tile onto the image background.</p>
				7409
				7410	<div style="margin: auto;">
				7411	<h3 class="magick-header"><a id="threshold"></a>-threshold <var>value</var>{<var>%</var>}</h3>
				7412	</div>
				7413
				7414	<!-- {<var>green,blue,opacity</var>}
				7415	<p>If the green or blue value is omitted, these channels use the same value as
				7416	the first one provided. If all three color values are the same, the result is
				7417	a bi-level image. If the opacity threshold is omitted, OpaqueOpacity is used
				7418	and any partially transparent pixel becomes fully transparent.</p>
				7419	-->
				7420
				7421	<p class="magick-description">Apply simultaneous black/white threshold to the image.</p>
				7422
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7423	<p>Any pixel values (more specifically, those channels set using <a href="command-line-options.html#channel">‑channel</a>) that exceed the specified threshold are reassigned the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7424	maximum channel value, while all other values are assigned the minimum.</p>
				7425
				7426	<p> The threshold value can be given as a percentage or as an absolute integer
				7427	value corresponding to the desired channel value. When given as an integer,
				7428	the minimum attainable value is 0 (corresponding to black when all channels
				7429	are affected), but the maximum value (corresponding to white) is that of the
				7430	<code>quantum depth</code> of the particular build of ImageMagick, and is
				7431	therefore dependent on the installation. For that reason, a reasonable
				7432	recommendation for most applications is to specify the threshold values as
				7433	a percentage. </p>
				7434
				7435	<p> The following would force pixels with red values above 50% to have 100%
				7436	red values, while those at or below 50% red would be set to 0 in the red
				7437	channel. The green, blue, and alpha channels (if present) would be unchanged.
				7438	</p>
				7439
				7440	<pre>
				7441	convert in.png -channel red -threshold 50% out.png
				7442	</pre>
				7443
				7444	<p>As (possibly) impractical but instructive examples, the following would
				7445	generate an all-black and an all-white image with the same dimensions as the
				7446	input image.</p>
				7447
				7448
				7449	<pre>
				7450	convert in.png -threshold 100% black.png
				7451	convert in.png -threshold -1 white.png
				7452	</pre>
				7453
				7454	<p>Note that the values of the transparency channel is treated as 'matte'
				7455	values (0 is opaque) and not as 'alpha' values (0 is transparent).</p>
				7456
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7457	<p> See also <a href="command-line-options.html#black-threshold">‑black‑threshold</a> and <a href="command-line-options.html#white-threshold">‑white‑threshold</a>.
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7458	</p>
				7459
				7460	<div style="margin: auto;">
				7461	<h3 class="magick-header"><a id="thumbnail"></a>-thumbnail <var>geometry</var></h3>
				7462	</div>
				7463
				7464	<p class="magick-description">Create a thumbnail of the image.</p>
				7465
				7466	<p>This is similar to <a href="command-line-options.html#resize">-resize</a>, except it is optimized
				7467	for speed and any image profile, other than a color profile, is removed to
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7468	reduce the thumbnail size. To strip the color profiles as well, add <a
				7469	href="command-line-options.html#strip">-strip</a> just before of after this option.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7470
				7471	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				7472
				7473	<div style="margin: auto;">
				7474	<h3 class="magick-header"><a id="tile"></a>-tile <var>filename</var></h3>
				7475	</div>
				7476
				7477	<p class="magick-description">Set the tile image used for filling a subsequent graphic primitive.</p>
				7478
				7479	<div style="margin: auto;">
				7480	<h3 class="magick-header">-tile <var>geometry</var></h3>
				7481	</div>
				7482
				7483	<p class="magick-description">Specify the layout of images.</p>
				7484
				7485	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				7486
				7487	<div style="margin: auto;">
				7488	<h3 class="magick-header">-tile</h3>
				7489	</div>
				7490
				7491	<p class="magick-description">Specifies that a subsequent composite operation is repeated across and down image.</p>
				7492
				7493	<div style="margin: auto;">
				7494	<h3 class="magick-header"><a id="tile-offset"></a>-tile-offset {<var>+-</var>}<var>x</var>{<var>+-</var>}<var>y</var></h3>
				7495	</div>
				7496
				7497	<p class="magick-description">Specify the offset for tile images, relative to the background image it is tiled on.</p>
				7498
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7499	<p>This should be set before the tiling image is set by <a href="command-line-options.html#tile"
				7500	>-tile</a> or <a href="command-line-options.html#texture" >-texture</a>, or directly applied for
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7501	creating a tiled canvas using <code>TILE:</code> or <code>PATTERN:</code> input
				7502	formats. </p>
				7503
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7504	<p>Internally ImageMagick does a <a href="command-line-options.html#roll" >-roll</a> of the tile image
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7505	by the arguments given when the tile image is set. </p>
				7506
				7507	<div style="margin: auto;">
				7508	<h3 class="magick-header"><a id="tint"></a>-tint <var>value</var></h3>
				7509	</div>
				7510
				7511	<p class="magick-description">Tint the image with the fill color.</p>
				7512
				7513	<p>Tint the image with the fill color.</p>
				7514
				7515	<p>Specify the amount of tinting as a percentage. Pure colors like black,
				7516	white red, yellow, will not be affected by -tint. Only mid-range colors such
				7517	as the various shades of grey.</p>
				7518
				7519	<div style="margin: auto;">
				7520	<h3 class="magick-header"><a id="title"></a>-title <var>string</var></h3>
				7521	</div>
				7522
				7523	<p class="magick-description">Assign a title to displayed image.", "animate", "display", "montage</p>
				7524
				7525	<p>Use this option to assign a specific title to the image. This assigned to
				7526	the image window and is typically displayed in the window title bar.
				7527	Optionally you can include the image filename, type, width, height, Exif data,
				7528	or other image attribute by embedding special format characters described
				7529	under the <a href="command-line-options.html#format">-format</a> option.</p>
				7530
				7531	<p>For example,</p>
				7532
				7533	<pre>
				7534	-title "%m:%f %wx%h"
				7535	</pre>
				7536
				7537	<p>produces an image title of <code>MIFF:bird.miff 512x480</code> for an image
				7538	titled <code>bird.miff</code> and whose width is 512 and height is 480.</p>
				7539
				7540
				7541	<div style="margin: auto;">
				7542	<h3 class="magick-header"><a id="transform"></a>-transform</h3>
				7543	</div>
				7544
				7545	<p class="magick-description">transform the image.</p>
				7546
				7547	<p>This option applies the transformation matrix from a previous <a href="command-line-options.html#affine">-affine</a> option.</p>
				7548
				7549	<pre>
				7550	convert -affine 2,2,-2,2,0,0 -transform bird.ppm bird.jpg
				7551	</pre>
				7552
				7553
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7554	<p>This operator has been now been superseded by the <a
				7555	href="command-line-options.html#distort">-distort</a> '<code>AffineProjection</code>' method. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7556
				7557
				7558	<div style="margin: auto;">
				7559	<h3 class="magick-header"><a id="transparent"></a>-transparent <var>color</var></h3>
				7560	</div>
				7561
				7562	<p class="magick-description">Make this color transparent within the image.</p>
				7563
				7564	<p>The <var>color</var> argument is defined using the format
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7565	described under the <a href="command-line-options.html#fill">-fill</a> option. The <a href="command-line-options.html#fuzz"
				7566	>-fuzz</a> setting can be used to match and replace colors similar to the one
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7567	given. </p>
				7568
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7569	<p>Use <a href="command-line-options.html#transparent" >+transparent</a> to invert the pixels matched.
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7570	that is make all non-matching colors transparent. </p>
				7571
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7572	<p>The <a href="command-line-options.html#opaque">-opaque</a> operator is exactly the same as <a
				7573	href="command-line-options.html#transparent" >-transparent</a> but replaces the matching color with the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7574	current <a href="command-line-options.html#fill">-fill</a> color setting, rather than transparent.
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7575	However the <a href="command-line-options.html#transparent" >-transparent</a> operator also ensures
				7576	that the image has an alpha channel enabled, as per "<code><a href="command-line-options.html#alpha"
				7577	>-alpha</a> set</code>", and does not require you to modify the <a
				7578	href="command-line-options.html#channel">-channel</a> to enable alpha channel handling. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7579
				7580	<p>Note that this does not define the color as being the 'transparency color'
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7581	used for color-mapped image formats, such as GIF. For that use <a
				7582	href="command-line-options.html#transparent-color" >-transparent-color</a> </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7583
				7584
				7585	<div style="margin: auto;">
				7586	<h3 class="magick-header"><a id="transparent-color"></a>-transparent-color <var>color</var></h3>
				7587	</div>
				7588
				7589	<p class="magick-description">Set the transparent color.</p>
				7590
				7591	<p>Sometimes this is used for saving to image formats such as
				7592	GIF and PNG8 which uses this color to represent boolean transparency. This
				7593	does not make a color transparent, it only defines what color the transparent
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7594	color is in the color palette of the saved image. Use <a
				7595	href="command-line-options.html#transparent">-transparent</a> to make an opaque color transparent.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7596
				7597	<p>This option allows you to have both an opaque visible color, as well as a
				7598	transparent color of the same color value without conflict. That is, you can
				7599	use the same color for both the transparent and opaque color areas within an
				7600	image. This, in turn, frees to you to select a transparent color that is
				7601	appropriate when an image is displayed by an application that does not handle a
				7602	transparent color index, while allowing ImageMagick to correctly handle images of this
				7603	type. </p>
				7604
				7605	<p>The default transparent color is <code>#00000000</code>, which is fully transparent black.</p>
				7606
				7607	<div style="margin: auto;">
				7608	<h3 class="magick-header"><a id="transpose"></a>-transpose</h3>
				7609	</div>
				7610
				7611	<p class="magick-description">Mirror the image along the top-left to bottom-right diagonal.</p>
				7612
				7613	<p> This option mathematically transposes the pixel array. It is equivalent to the sequence <code>-flip -rotate 90</code>.
				7614	</p>
				7615
				7616	<div style="margin: auto;">
				7617	<h3 class="magick-header"><a id="transverse"></a>-transverse</h3>
				7618	</div>
				7619
				7620	<p class="magick-description">Mirror the image along the images bottom-left top-right diagonal. Equivalent to the operations <code>-flop -rotate 90</code>.</p>
				7621
				7622
				7623	<div style="margin: auto;">
				7624	<h3 class="magick-header"><a id="treedepth"></a>-treedepth <var>value</var></h3>
				7625	</div>
				7626
				7627	<p class="magick-description">tree depth for the color reduction algorithm.</p>
				7628
				7629	<p>Normally, this integer value is zero or one. A value of zero or one causes
				7630	the use of an optimal tree depth for the color reduction algorithm.</p>
				7631
				7632	<p>An optimal depth generally allows the best representation of the source
				7633	image with the fastest computational speed and the least amount of memory.
				7634	However, the default depth is inappropriate for some images. To assure the
				7635	best representation, try values between 2 and 8 for this parameter. Refer to
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7636	the <a href="quantize.html"
				7637	>color reduction algorithm</a> for more details.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7638
				7639	<p>The <a href="command-line-options.html#colors">-colors</a> or <a href="command-line-options.html#monochrome">-monochrome</a>
				7640	option, or writing to an image format which requires color reduction, is
				7641	required for this option to take effect.</p>
				7642
				7643	<div style="margin: auto;">
				7644	<h3 class="magick-header"><a id="trim"></a>-trim</h3>
				7645	</div>
				7646
				7647	<p class="magick-description">trim an image.</p>
				7648
				7649	<p>This option removes any edges that are exactly the same color as the corner
				7650	pixels. Use <a href="command-line-options.html#fuzz">-fuzz</a> to make <a href="command-line-options.html#trim">-trim</a> remove
				7651	edges that are nearly the same color as the corner pixels.</p>
				7652
				7653	<p>The page or virtual canvas information of the image is preserved allowing
				7654	you to extract the result of the <a href="command-line-options.html#trim">-trim</a> operation from the
				7655	image. Use a <a href="command-line-options.html#repage">+repage</a> to remove the virtual canvas page
				7656	information if it is unwanted.</p>
				7657
				7658	<p>If the trimmed image 'disappears' an warning is produced, and a special
				7659	single pixel transparent 'missed' image is returned, in the same way as when a
				7660	<a href="command-line-options.html#crop">-crop</a> operation 'misses' the image proper. </p>
				7661
				7662
				7663	<div style="margin: auto;">
				7664	<h3 class="magick-header"><a id="type"></a>-type <var>type</var></h3>
				7665	</div>
				7666
				7667	<p class="magick-description">the image type.</p> <p>Choose from: <code>Bilevel</code>,
				7668	<code>Grayscale</code>, <code>GrayscaleMatte</code>, <code>Palette</code>,
				7669	<code>PaletteMatte</code>, <code>TrueColor</code>, <code>TrueColorMatte</code>,
				7670	<code>ColorSeparation</code>, or <code>ColorSeparationMatte</code>.</p>
				7671
				7672	<p>Normally, when a format supports different subformats such as grayscale and
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7673	truecolor, the encoder will try to choose an efficient subformat. The <a
				7674	href="command-line-options.html#type">-type</a> option can be used to override this behavior. For
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7675	example, to prevent a JPEG from being written in grayscale format even though
				7676	only gray pixels are present, use.</p>
				7677
				7678	<pre>
				7679	convert bird.png -type TrueColor bird.jpg
				7680	</pre>
				7681
				7682	<p>Similarly, use <a href="command-line-options.html#type">-type TrueColorMatte</a> to force the
				7683	encoder to write an alpha channel even though the image is opaque, if the
				7684	output format supports transparency.</p>
				7685
				7686	<p>Use <a href="command-line-options.html#type">-type optimize</a> to ensure the image is written in the smallest possible file size.</p>
				7687
				7688	<div style="margin: auto;">
				7689	<h3 class="magick-header"><a id="undercolor"></a>-undercolor <var>color</var></h3>
				7690	</div>
				7691
				7692	<p class="magick-description">set the color of the annotation bounding box.</p>
				7693
				7694	<p>The color is specified using the format described under the <a href="command-line-options.html#fill">-fill</a> option.</p>
				7695
				7696	<p>See <a href="command-line-options.html#draw">-draw</a> for further details.</p>
				7697
				7698
				7699	<div style="margin: auto;">
				7700	<h3 class="magick-header"><a id="update"></a>-update <var>seconds</var></h3>
				7701	</div>
				7702
				7703	<p class="magick-description">detect when image file is modified and redisplay.</p>
				7704
				7705	<p>Suppose that while you are displaying an image the file that is currently
				7706	displayed is over-written. <code>display</code> will automagically detect that
				7707	the input file has been changed and update the displayed image
				7708	accordingly.</p>
				7709
				7710
				7711	<div style="margin: auto;">
				7712	<h3 class="magick-header"><a id="unique-colors"></a>-unique-colors</h3>
				7713	</div>
				7714
				7715	<p class="magick-description">discard all but one of any pixel color.</p>
				7716
				7717
				7718	<div style="margin: auto;">
				7719	<h3 class="magick-header"><a id="units"></a>-units <var>type</var></h3>
				7720	</div>
				7721
				7722	<p class="magick-description">the units of image resolution.</p>
				7723
				7724	<p>Choose from: <code>Undefined</code>, <code>PixelsPerInch</code>, or
				7725	<code>PixelsPerCentimeter</code>. This option is normally used in conjunction
				7726	with the <a href="command-line-options.html#density">-density</a> option.</p>
				7727
				7728
				7729	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7730	<h3 class="magick-header"><a id="unsharp"></a>-unsharp <var>radius</var><br />-unsharp <var>radius</var>x<var>sigma</var>{<var>+gain</var>}{<var>+threshold</var>}</h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7731	</div>
				7732
				7733	<p class="magick-description">sharpen the image with an unsharp mask operator.</p>
				7734
				7735	<p>The <a href="command-line-options.html#unsharp">-unsharp</a> option sharpens an image. The image is
				7736	convolved with a Gaussian operator of the given radius and standard deviation
				7737	(sigma). For reasonable results, radius should be larger than sigma. Use
				7738	a radius of 0 to have the method select a suitable radius.</p>
				7739
				7740	<p>The parameters are:</p>
				7741
				7742	<dl class="dl-horizontal">
				7743	<dt>radius</dt>
				7744	<dd>The radius of the Gaussian, in pixels, not counting the center pixel (default 0).</dd>
				7745	<dt>sigma</dt>
				7746	<dd>The standard deviation of the Gaussian, in pixels (default 1.0).</dd>
				7747	<dt>gain</dt>
				7748	<dd>The fraction of the difference between the original and the blur image that is added back into the original (default 1.0).</dd>
				7749	<dt>threshold</dt>
				7750	<dd>The threshold, as a fraction of <var>QuantumRange</var>, needed to apply the difference amount (default 0.05).</dd>
				7751	</dl>
				7752
				7753	<div style="margin: auto;">
				7754	<h3 class="magick-header"><a id="verbose"></a>-verbose</h3>
				7755	</div>
				7756
				7757	<p class="magick-description">print detailed information about the image when this option precedes the <a href="command-line-options.html#identify">-identify</a> option or <code>info:</code>.</p>
				7758
				7759
				7760	<div style="margin: auto;">
				7761	<h3 class="magick-header"><a id="version"></a>-version</h3>
				7762	</div>
				7763
				7764	<p class="magick-description">print ImageMagick version string and exit.</p>
				7765
				7766
				7767	<div style="margin: auto;">
				7768	<h3 class="magick-header"><a id="view"></a>-view <var>string</var></h3>
				7769	</div>
				7770
				7771	<p class="magick-description">FlashPix viewing parameters.</p>
				7772
				7773
				7774	<div style="margin: auto;">
				7775	<h3 class="magick-header"><a id="vignette"></a>-vignette <var>radius</var>{x<var>sigma</var>}{<var>+-</var>}<var>x</var>{<var>+-</var>}<var>y</var>{<var>%</var>}</h3>
				7776	</div>
				7777
				7778	<p class="magick-description">soften the edges of the image in vignette style.</p>
				7779
				7780	<p>The vignette effect rolloff is controlled by radiusxsigma. For nominal rolloff, this would be set to 0xsigma. A value of 0x0 will produce a circle/ellipse with no rolloff. The arguments x and y control the size of the circle. Larger values decrease the radii and smaller values increase the radii. Values of +0+0 will generate a circle/ellipse the same size as the image. The default values for x and y are 10% of the corresponding image dimension. Thus, the radii will be decreased by 10%, i.e., the diameters of the circle/ellipse will be 80% of the corresponding image dimension.</p>
				7781
				7782	<div style="margin: auto;">
				7783	<h3 class="magick-header"><a id="virtual-pixel"></a>-virtual-pixel <var>method</var></h3>
				7784	</div>
				7785
				7786	<p class="magick-description">Specify contents of <var>virtual pixels</var>.</p>
				7787
				7788	<p>This option defines what color source should be used if and when a color
				7789	lookup completely 'misses' the source image. The color(s) that appear to
				7790	surround the source image. Generally this color is derived from the source
				7791	image, but could also be set to a specify background color. </p>
				7792
				7793	<p>Choose from these methods:</p>
				7794
				7795	<dl class="dl-horizontal">
				7796	<dt>background</dt><dd>the area surrounding the image is the background color</dd>
				7797	<dt>black</dt><dd>the area surrounding the image is black</dd>
				7798	<dt>checker-tile</dt><dd>alternate squares with image and background color</dd>
				7799	<dt>dither</dt><dd>non-random 32x32 dithered pattern</dd>
				7800	<dt>edge</dt><dd>extend the edge pixel toward infinity</dd>
				7801	<dt>gray</dt><dd>the area surrounding the image is gray</dd>
				7802	<dt>horizontal-tile</dt><dd>horizontally tile the image, background color above/below</dd>
				7803	<dt>horizontal-tile-edge</dt><dd>horizontally tile the image and replicate the side edge pixels</dd>
				7804	<dt>mirror</dt><dd>mirror tile the image</dd>
				7805	<dt>random</dt><dd>choose a random pixel from the image</dd>
				7806	<dt>tile</dt><dd>tile the image (default)</dd>
				7807	<dt>transparent</dt><dd>the area surrounding the image is transparent blackness</dd>
				7808	<dt>vertical-tile</dt><dd>vertically tile the image, sides are background color</dd>
				7809	<dt>vertical-tile-edge</dt><dd>vertically tile the image and replicate the side edge pixels</dd>
				7810	<dt>white</dt><dd>the area surrounding the image is white</dd>
				7811	</dl>
				7812
				7813	<p>The default value is "edge".</p>
				7814
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7815	<p>This most important for distortion operators such as <a href="command-line-options.html#distort"
				7816	>-distort</a>, <a href="command-line-options.html#implode" >-implode</a>, and <a href="command-line-options.html#fx" >-fx</a>.
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7817	However it also effects operations that may access pixels just outside the
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7818	image proper, such as <a href="command-line-options.html#convolve">-convolve</a>, <a
				7819	href="command-line-options.html#blur">-blur</a>, and <a href="command-line-options.html#sharpen">-sharpen</a>. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7820
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7821	<p>To print a complete list of virtual pixel types, use the <a
				7822	href="command-line-options.html#list">-list virtual-pixel</a> option.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7823
				7824
				7825	<div style="margin: auto;">
				7826	<h3 class="magick-header"><a id="visual"></a>-visual <var>type</var></h3>
				7827	</div>
				7828
				7829	<p class="magick-description">Animate images using this X visual type.", 'animate', 'display'</p>
				7830
				7831	<p>Choose from these visual classes:</p>
				7832
				7833	<pre>
				7834	StaticGray TrueColor
				7835	GrayScale DirectColor
				7836	StaticColor default
				7837	PseudoColor visual id
				7838	</pre>
				7839
				7840	<p>The X server must support the visual you choose, otherwise an error occurs.
				7841	If a visual is not specified, the visual class that can display the most
				7842	simultaneous colors on the default screen is chosen.</p>
				7843
				7844
				7845	<div style="margin: auto;">
				7846	<h3 class="magick-header"><a id="watermark"></a>-watermark <var>brightness</var>x<var>saturation</var></h3>
				7847	</div>
				7848
				7849	<p class="magick-description">Watermark an image using the given percentages of brightness and saturation.</p>
				7850
				7851	<p>Take a grayscale image (with alpha mask) and modify the destination image's
				7852	brightness according to watermark image's grayscale value and the
				7853	<var>brightness</var> percentage. The destinations color saturation
				7854	attribute is just direct modified by the <var>saturation</var>
				7855	percentage, which defaults to 100 percent (no color change). </p>
				7856
				7857
				7858	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7859	<h3 class="magick-header"><a id="wave"></a>-wave <var>amplitude</var><br />-wave <var>amplitude</var>x<var>wavelength</var></h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7860	</div>
				7861
				7862	<p class="magick-description">Shear the columns of an image into a sine wave.</p>
				7863
Cristy	e09ed31	2016-03-06 08:07:39 -0500	[diff] [blame]	7864	<div style="margin: auto;">
				7865	<h3 class="magick-header"><a id="wavelet-denoise"></a>-wavelet-denoise <var>threshold</var><br />-wavelet-denoise <var>threshold</var>x<var>softness</var></h3>
				7866	</div>
				7867
				7868	<p class="magick-description">removes noise from the image using a wavelet transform. The threshold is the value below which everything is considered noise and ranges from 0.0 (none) to QuantumRange or use percent (e.g. 5%). Softness attenuates the threshold and typically ranges from 0.0 (none) to 1.0. The higher the value the more noise that remains in the image.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7869
				7870	<div style="margin: auto;">
				7871	<h3 class="magick-header"><a id="weight"></a>-weight <var>fontWeight</var></h3>
				7872	</div>
				7873
				7874	<p class="magick-description">Set a font weight for text.</p>
				7875
				7876	<p>This setting suggests a font weight that ImageMagick should try to apply to
				7877	the currently selected font family. Use a positive integer for
				7878	<var>fontWeight</var> or select from the following.</p>
				7879
				7880	<dl class="dl-horizontal">
				7881	<dt>Thin </dt>
				7882	<dd>Same as <var>fontWeight</var> = 100.</dd>
				7883	<dt>ExtraLight </dt>
				7884	<dd>Same as <var>fontWeight</var> = 200.</dd>
				7885	<dt>Light </dt>
				7886	<dd>Same as <var>fontWeight</var> = 300.</dd>
				7887	<dt>Normal </dt>
				7888	<dd>Same as <var>fontWeight</var> = 400.</dd>
				7889	<dt>Medium </dt>
				7890	<dd>Same as <var>fontWeight</var> = 500.</dd>
				7891	<dt>DemiBold </dt>
				7892	<dd>Same as <var>fontWeight</var> = 600.</dd>
				7893	<dt>Bold </dt>
				7894	<dd>Same as <var>fontWeight</var> = 700.</dd>
				7895	<dt>ExtraBold </dt>
				7896	<dd>Same as <var>fontWeight</var> = 800.</dd>
				7897	<dt>Heavy </dt>
				7898	<dd>Same as <var>fontWeight</var> = 900.</dd>
				7899	</dl>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7900	<br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7901
				7902	<p>To print a complete list of weight types, use <a href="command-line-options.html#list">-list weight</a>.</p>
				7903
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7904	<p>For other settings that affect fonts, see the options <a
				7905	href="command-line-options.html#font">-font</a>, <a href="command-line-options.html#family">-family</a>, <a
				7906	href="command-line-options.html#stretch">-stretch</a>, and <a href="command-line-options.html#style">-style</a>. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7907
				7908	<div style="margin: auto;">
				7909	<h3 class="magick-header"><a id="white-point"></a>-white-point <var>x,y</var></h3>
				7910	</div>
				7911
				7912	<p class="magick-description">chromaticity white point.</p>
				7913
				7914	<div style="margin: auto;">
				7915	<h3 class="magick-header"><a id="white-threshold"></a>-white-threshold <var>value</var>{<var>%</var>}</h3>
				7916	</div>
				7917
				7918	<p class="magick-description">Force to white all pixels above the threshold while leaving all pixels at or below the threshold unchanged.</p>
				7919
				7920	<p> The threshold value can be given as a percentage or as an absolute integer
				7921	value within [0, <var>QuantumRange</var>] corresponding to the
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7922	desired <a href="command-line-options.html#channel">‑channel</a> value. See <a href="command-line-options.html#threshold">‑threshold</a>for more details on thresholds and resulting values. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7923
				7924	<div style="margin: auto;">
				7925	<h3 class="magick-header"><a id="window"></a>-window <var>id</var></h3>
				7926	</div>
				7927
				7928	<p class="magick-description">Make the image the background of a window.", 'animate', 'display'</p>
				7929
				7930	<p><var>id</var> can be a window id or name. Specify <code>root</code>
				7931	to select X's root window as the target window.</p>
				7932
				7933	<p>By default the image is tiled onto the background of the target window. If
				7934	<code>backdrop</code> or <a href="command-line-options.html#geometry">-resize</a> are specified, the
				7935	image is surrounded by the background color. Refer to <code>X RESOURCES</code>
				7936	for details.</p>
				7937
				7938	<p>The image will not display on the root window if the image has more unique
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7939	colors than the target window colormap allows. Use <a
				7940	href="command-line-options.html#colors">-colors</a> to reduce the number of colors.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7941
				7942	<div style="margin: auto;">
				7943	<h3 class="magick-header"><a id="window-group"></a>-window-group</h3>
				7944	</div>
				7945
				7946	<p class="magick-description">specify the window group.</p>
				7947
				7948	<div style="margin: auto;">
				7949	<h3 class="magick-header"><a id="write"></a>-write <var>filename</var></h3>
				7950	</div>
				7951
				7952	<p class="magick-description">write an image sequence.</p>
				7953
				7954	<p>The image sequence preceding the <a href="command-line-options.html#write">-write</a> <var>filename</var> 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="command-line-options.html#write">+write</a> <var>filename</var> option.</p>
				7955
				7956	<p>Use <a href="command-line-options.html#compress">-compress</a> to specify the type of image compression.</p>
Cristy	e077971	2016-07-30 17:25:22 -0400	[diff] [blame]	7957
				7958	<div style="margin: auto;">
				7959	<h3 class="magick-header"><a id="write-mask"></a>-write-mask <var>filename</var></h3>
				7960	</div>
				7961
				7962	<p class="magick-description">Prevent updates to image pixels specified by the mask.</p>
				7963
				7964	<p>This the same as using a mask used for composite masking operations, with
				7965	grayscale values causing blended updates of the image the mask is attached to.
				7966	</p>
				7967
				7968	<p>Use <a href="command-line-options.html#write-mask">+write-mask</a> to remove the mask from images.</p>
				7969
				7970	<p>Also see <a href="command-line-options.html#clip-mask">-clip-mask</a> which work in the same way,
				7971	but with strict boolean masking. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7972	</div>
				7973	</div>
				7974
				7975
Cristy	e93be68	2015-11-26 09:07:51 -0500	[diff] [blame]	7976
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7977	<footer class="magick-footer">
cristy	29f2c97	2015-07-28 13:37:46 +0000	[diff] [blame]	7978	<p><a href="support.html">Donate</a> •
				7979	<a href="sitemap.html">Sitemap</a> •
cristy	d243201	2015-05-04 23:15:15 +0000	[diff] [blame]	7980	<a href="links.html">Related</a> •
Cristy	e077971	2016-07-30 17:25:22 -0400	[diff] [blame]	7981	<a href="security-policy.html">Security</a> •
cristy	29f2c97	2015-07-28 13:37:46 +0000	[diff] [blame]	7982	<a href="architecture.html">Architecture</a>
cristy	d243201	2015-05-04 23:15:15 +0000	[diff] [blame]	7983	</p>
				7984	<p><a href="command-line-options.html#">Back to top</a> •
cristy	ea2793e	2015-05-31 16:52:26 +0000	[diff] [blame]	7985	<a href="http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x89AB63D48277377A">Public Key</a> •
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame^]	7986	<a href="http://www.imagemagick.org/script/contact.php">Contact Us</a></p>
Cristy	de27d76	2016-01-02 12:56:44 -0500	[diff] [blame]	7987	<p><small>© 1999-2016 ImageMagick Studio LLC</small></p>
cristy	d243201	2015-05-04 23:15:15 +0000	[diff] [blame]	7988	</footer>
				7989	</div><!-- /.container -->
				7990
Cristy	542697a	2015-10-12 20:10:32 -0400	[diff] [blame]	7991	<script src="https://localhost/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
Cristy	1f1f3a0	2016-06-01 07:25:42 -0400	[diff] [blame]	7992	<script src="../js/magick.html"></script>
cristy	d243201	2015-05-04 23:15:15 +0000	[diff] [blame]	7993	</div>
cristy	ad41c0c	2012-10-31 00:49:28 +0000	[diff] [blame]	7994	</body>
cristy	5a367e4	2015-05-05 12:39:18 +0000	[diff] [blame]	7995	</html>
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame^]	7996	<!-- Magick Cache 4th November 2016 22:35 -->