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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
Cristy	6549abb	2016-11-10 08:25:55 -0500	[diff] [blame]	1160	the <a href="http://www.imagemagick.org/www/quantize.html">
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	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
Cristy	6549abb	2016-11-10 08:25:55 -0500	[diff] [blame]	1410	<p>See <a href="http://www.imagemagick.org/www/compose.html">Alpha Compositing</a> for
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	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	6549abb	2016-11-10 08:25:55 -0500	[diff] [blame]	1706	href="https://www.imagemagick.org/script/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>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	1797	<td>set each pixel whose value is below zero to zero and any the pixel
				1798	whose value is above the quantum range to the quantum range (e.g. 65535)
				1799	otherwise the pixel value remains unchanged. Define supported in
				1800	ImageMagick 6.9.1-3 and above.</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1801	</tr>
				1802
				1803	<tr>
Cristy	de27d76	2016-01-02 12:56:44 -0500	[diff] [blame]	1804	<td>connected-components:area-threshold=<var>value</var></td>
				1805	<td>Merges any region with area smaller than <var>value</var> into its surrounding region or largest neighbor.</td>
				1806	</tr>
				1807
				1808	<tr>
				1809	<td>connected-components:keep=<var>list-of-ids</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	1810	<td>Comma and/or hyphenated list of id values to keep in the output.
				1811	Supported in Imagemagick 6.9.3-0.</td>
Cristy	de27d76	2016-01-02 12:56:44 -0500	[diff] [blame]	1812	</tr>
				1813
				1814	<tr>
				1815	<td>connected-components:mean-color=<var>true</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	1816	<td>Changes the output image from id values to mean color values. Supported
				1817	in Imagemagick 6.9.2-8.</td>
Cristy	de27d76	2016-01-02 12:56:44 -0500	[diff] [blame]	1818	</tr>
				1819
				1820	<tr>
				1821	<td>connected-components:remove=<var>list-of-ids</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	1822	<td>Comma and/or hyphenated list of id values to remove from the output.
				1823	Supported in Imagemagick 6.9.2-9.</td>
Cristy	de27d76	2016-01-02 12:56:44 -0500	[diff] [blame]	1824	</tr>
				1825
				1826	<tr>
				1827	<td>connected-components:verbose=<var>true</var></td>
				1828	<td>Lists id, bounding box, centroid, area, mean color for each region.</td>
				1829	</tr>
				1830
				1831	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1832	<td>convolve:scale=<var>{kernel_scale}[!^] [,{origin_addition}] [%]</var></td>
				1833	<td>Defines the kernel scaling. The special flag ! automatically scales to
				1834	full dynamic range. The ! flag can be used in combination with a factor or
				1835	percent. The factor or percent is then applied after the automatic scaling.
				1836	An example is 50%!. This produces a result 50% darker than full dynamic
				1837	range scaling. The ^ flag assures the kernel is 'zero-summing', for
				1838	example when some values are positive and some are negative as in edge
				1839	detection kernels. The origin addition adds that value to the center
				1840	pixel of the kernel. This produces and effect that is like adding the image
				1841	that many times to the result of the filtered image. The typical value
				1842	is 1 so that the original image is added to the result of the convolution.
				1843	The default is 0.</td>
				1844	</tr>
				1845
				1846	<tr>
				1847	<td>convolve:showkernel=<var>1</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1848	<td>Outputs (to 'standard error') all the information about a specified <a
				1849	href="command-line-options.html#morphology" >-morphology convolve</a> kernel.</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1850	</tr>
				1851
				1852	<tr>
				1853	<td>dcm:display-range=<var>reset</var></td>
				1854	<td>Sets the display range to the minimum and maximum pixel values for the
				1855	DCM image format.</td>
				1856	</tr>
				1857
				1858	<tr>
				1859	<td>dds:cluster-fit=<var>true\|false</var></td>
				1860	<td>Enables the dds cluster-fit.</td>
				1861	</tr>
				1862
				1863	<tr>
				1864	<td>dds:compression=<var>dxt1\|dxt5\|none</var></td>
				1865	<td>Sets the dds compression.</td>
				1866	</tr>
				1867
				1868	<tr>
				1869	<td>dds:mipmaps=<var>value</var></td>
				1870	<td>Sets the dds number of mipmaps.</td>
				1871	</tr>
				1872
				1873	<tr>
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame]	1874	<td>dds:weight-by-alpha=<var>true\|false</var></td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1875	<td>Enables the dds alpha weighting.</td>
				1876	</tr>
				1877
				1878	<tr>
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame]	1879	<td>deskew:auto-crop=<var>true</var></td>
				1880	<td>auto crop the image after deskewing.</td>
				1881	</tr>
				1882
				1883	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1884	<td>delegate:bimodal=<var>true</var></td>
				1885	<td>Specifies direct conversion from Postscript to PDF.</td>
				1886	</tr>
				1887
				1888	<tr>
				1889	<td>distort:scale=<var>value</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	1890	<td>Sets the output scaling factor for use with <a href="command-line-options.html#distort"
				1891	>-distort</a></td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1892	</tr>
				1893
				1894	<tr>
				1895	<td>distort:viewport=<var>WxH+X+Y</var></td>
				1896	<td>Sets the viewport for use with <a href="command-line-options.html#distort">-distort</a></td>
				1897	</tr>
				1898
				1899	<tr>
				1900	<td>dot:layout-engine=<var>value</var></td>
				1901	<td>Specifies the layout engine for the DOT image format (e.g.
				1902	<code>neato</code>).</td>
				1903	</tr>
				1904
				1905	<tr>
				1906	<td>filter:option=<var>value</var></td>
				1907	<td>Set a filter option for use with <a href="command-line-options.html#resize">-resize</a>.
				1908	See <a href="command-line-options.html#filter">-filter</a> for details.</td>
				1909	</tr>
				1910
				1911	<tr>
				1912	<td>fourier:normalize=<var>inverse</var></td>
				1913	<td>Sets the location for the FFT/IFT normalization as use by
				1914	<a href="command-line-options.html#fft">+-fft</a> and <a href="command-line-options.html#ift">+-ift</a>. The default is
				1915	<var>forward</var>.</td>
				1916	</tr>
				1917
				1918	<tr>
				1919	<td>h:format=<var>value</var></td>
				1920	<td>Set the image encoding format use when writing a C-style header.
				1921	<var>format</var> can be any output format supported by ImageMagick
				1922	except for <var>h</var> and <var>magick</var></td>. If this
				1923	option is omitted, the default is <var>GIF</var> for PseudoClass
				1924	images and <var>PNM</var> for DirectClass images.
				1925	</tr>
				1926
				1927	<tr>
				1928	<td>icon:auto-resize</td>
				1929	<td>Automatically stores multiple sizes when writing an ico image
				1930	(requires a 256x256 input image).</td>
				1931	</tr>
				1932
				1933	<tr>
				1934	<td>jp2:layer-number=<var>value</var></td>
				1935	<td>Sets the maximum number of quality layers to decode. Same for JPT, JC2,
				1936	and J2K</td>
				1937	</tr>
				1938
				1939	<tr>
				1940	<td>jp2:number-resolutions=<var>value</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	1941	<td>Sets the number of resolutions to encode.Same for JPT, JC2, and
				1942	J2K</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1943	</tr>
				1944
				1945	<tr>
				1946	<td>jp2:progression-order=<var>value</var></td>
				1947	<td>choose from LRCP, RLCP, RPCL, PCRL or CPRL. Same for JPT, JC2, and
				1948	J2K</td>
				1949	</tr>
				1950
				1951	<tr>
				1952	<td>jp2:quality=<var>value,value...</var></td>
				1953	<td>Sets the quality layer PSNR, given in dB. The order is from left to
				1954	right in ascending order. The default is a single lossless quality layer.
				1955	Same for JPT, JC2, and J2K</td>
				1956	</tr>
				1957
				1958	<tr>
				1959	<td>jp2:rate=<var>value</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	1960	<td>Specify the compression factor to use while writing JPEG-2000 files.
				1961	The compression factor is the reciprocal of the compression ratio. The
				1962	valid range is 0.0 to 1.0, with 1.0 indicating lossless compression. If
				1963	defined, this value overrides the -quality setting. A quality setting
				1964	of 75 results in a rate value of 0.06641. Same for JPT, JC2, and J2K</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1965	</tr>
				1966
				1967	<tr>
				1968	<td>jp2:reduce-factor=<var>value</var></td>
				1969	<td>Sets the number of highest resolution levels to be discarded.Same for
				1970	JPT, JC2, and J2K</td>
				1971	</tr>
				1972
				1973	<tr>
				1974	<td>jpeg:block-smoothing=<var>on\|off</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	1975	<td> </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1976	</tr>
				1977
				1978	<tr>
				1979	<td>jpeg:colors=<var>value</var></td>
				1980	<td>Set the desired number of colors and let the JPEG encoder do the
				1981	quantizing.</td>
				1982	</tr>
				1983
				1984	<tr>
				1985	<td>jpeg:dct-method=<var>value</var></td>
				1986	<td>Choose from <code>default</code>, <code>fastest</code>,
				1987	<code>float</code>, <code>ifast</code>, and <code>islow</code>.</td>
				1988	</tr>
				1989
				1990	<tr>
				1991	<td>jpeg:extent=<var>value</var></td>
				1992	<td>Restrict the maximum JPEG file size, for example <code>-define
				1993	jpeg:extent=400KB</code>. The JPEG encoder will search for the highest
				1994	compression quality level that results in an output file that does not
Cristy	e93be68	2015-11-26 09:07:51 -0500	[diff] [blame]	1995	exceed the value. The <code>-quality</code> option also will be respected
				1996	starting with version 6.9.2-5. Between 6.9.1-0 and 6.9.2-4, add -quality
				1997	100 in order for the jpeg:extent to work properly. Prior to 6.9.1-0, the
				1998	-quality setting was ignored.</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	1999	</tr>
				2000
				2001	<tr>
				2002	<td>jpeg:fancy-upsampling=<var>on\|off</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2003	<td> </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2004	</tr>
				2005
				2006	<tr>
				2007	<td>jpeg:optimize-coding=<var>on\|off</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2008	<td> </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2009	</tr>
				2010
				2011	<tr>
				2012	<td>jpeg:q-table=<var>table</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2013	<td> </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2014	</tr>
				2015
				2016	<tr>
				2017	<td>jpeg:sampling-factor=<var>sampling-factor-string</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2018	<td> </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2019	</tr>
				2020
				2021	<tr>
				2022	<td>jpeg:size=<var>geometry</var></td>
				2023	<td>Set the size hint of a JPEG image, for
				2024	example, <code>-define jpeg:size=128x128</code>.
				2025	It is most useful for increasing performance and reducing the memory
				2026	requirements when reducing the size of a large JPEG image.</td>
				2027	</tr>
				2028
				2029	<tr>
				2030	<td>json:features</td>
				2031	<td>includes features in verbose information</td>
				2032	</tr>
				2033
				2034	<tr>
				2035	<td>json:limit</td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2036	<td> </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2037	</tr>
				2038
				2039	<tr>
				2040	<td>json:locate</td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2041	<td> </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2042	</tr>
				2043
				2044	<tr>
				2045	<td>json:moments</td>
				2046	<td>includes image moments in verbose information</td>
				2047	</tr>
				2048
				2049	<tr>
				2050	<td>magick:format=<var>value</var></td>
				2051	<td>Set the image encoding format use when writing a C-style header.
				2052	This is the same as "h:format=format" described above.</td>.
				2053	</tr>
				2054
				2055	<tr>
				2056	<td>mng:need-cacheoff</td>
				2057	<td>turn playback caching off for streaming MNG.</td>
				2058	</tr>
				2059
				2060	<tr>
				2061	<td>morphology:compose=<var>compose-method</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2062	<td>Specifies how to merge results generated by multiple<a
				2063	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]	2064	typical value is 'lighten' as used, for example, with the sobel edge
				2065	kernels. </td>
				2066	</tr>
				2067
				2068	<tr>
				2069	<td>morphology:showkernel=<var>1</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2070	<td>Outputs (to 'standard error') all the information about a generated <a
				2071	href="command-line-options.html#morphology" >-morphology</a> kernel.</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2072	</tr>
				2073
				2074	<tr>
				2075	<td>pcl:fit-to-page=<var>true</var></td>
				2076
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2077	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2078	<td>pdf:fit-page=<var>geometry</var></td>
				2079	<td> geometry specifies the scaling dimensions for resizing when the PDF is
				2080	being read. The geometry is either WxH{%} or page size. No offsets are
				2081	allowed. (introduced in IM 6.8.8-8)</td>
				2082	</tr>
				2083
				2084	<tr>
				2085	<td>pdf:fit-to-page=<var>true</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2086	<td> </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2087	</tr>
				2088
				2089	<tr>
				2090	<td>pdf:use-cropbox=<var>true</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2091	<td> </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2092	</tr>
				2093
				2094	<tr>
				2095	<td>pdf:use-trimbox=<var>true</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2096	<td> </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2097	</tr>
				2098
				2099	<tr>
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame]	2100	<td>phash:colorspaces=<var>colorspace,colorspace,...</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2101	<td>the perceptual hash defaults to the sRGB and HCLp colorspaces. When
				2102	using this define, you can specify up to six alternative colorspaces. (as
				2103	of IM 7.0.3-8)</td>
				2104	</tr>
				2105
				2106	<tr>
				2107	<td>phash:normalize=<var>true</var></td>
				2108	<td>normalizes the phash metric by dividing by the number of channels
				2109	specified by <code>-define phash:colorspaces</code> when using compare
				2110	-metric phash. (as of IM 7.0.3-8)</td>
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame]	2111	</tr>
				2112
				2113	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2114	<td>png:bit-depth=<var>value</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2115	<td> </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2116	</tr>
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame]	2117
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2118	<tr>
				2119	<td>png:color-type=<var>value</var></td>
				2120	<td>desired bit-depth and color-type for PNG output. You can force the PNG
				2121	encoder to use a different bit-depth and color-type than it would have
				2122	normally selected, but only if this does not cause any loss of image
				2123	quality. Any attempt to reduce image quality is treated as an error and no
				2124	PNG file is written. E.g., if you have a 1-bit black-and-white image, you
				2125	can use these "defines" to cause it to be written as an 8-bit grayscale,
				2126	indexed, or even a 64-bit RGBA. But if you have a 16-million color image,
				2127	you cannot force it to be written as a grayscale or indexed PNG. If you
				2128	wish to do this, you must use the appropriate <a href="command-line-options.html#depth">-depth</a>,
				2129	<a href="command-line-options.html#colors">-colors</a>, or <a href="command-line-options.html#type">-type</a> directives to
				2130	reduce the image quality prior to using the PNG encoder. Note that in
				2131	indexed PNG files, "bit-depth" refers to the number of bits per index,
				2132	which can be 1, 2, 4, or 8. In such files, the color samples always have
				2133	8-bit depth.</td>
				2134	</tr>
				2135
				2136	<tr>
				2137	<td>png:compression-filter=<var>value</var></td>
				2138	<td> valid values are 0 through 9. 0-4 are the corresponding PNG filters,
				2139	5 means adaptive filtering except for images with a colormap, 6 means
				2140	adaptive filtering for all images, 7 means MNG "loco" compression, 8 means
				2141	Z_RLE strategy with adaptive filtering, and 9 means Z_RLE strategy with no
				2142	filtering.</td>
				2143	</tr>
				2144
				2145	<tr>
				2146	<td>png:compression-level=<var>value</var></td>
				2147	<td> valid values are 0 through 9, with 0 providing the least but fastest
				2148	compression and 9 usually providing the best and always the slowest.</td>
				2149	</tr>
				2150
				2151	<tr>
				2152	<td>png:compression-strategy=<var>value</var></td>
				2153	<td> valid values are 0 through 4, meaning default, filtered, huffman_only,
				2154	rle, and fixed ZLIB compression strategy. If you are using an old zlib
				2155	that does not support Z_RLE (before 1.2.0) or Z_FIXED (before 1.2.2.2),
				2156	values 3 and 4, respectively, will use the zlib default strategy
				2157	instead.</td>
				2158	</tr>
				2159
				2160	<tr>
				2161	<td>png:format=<var>value</var></td>
				2162	<td> valid values are <var>png8</var>, <var>png24</var>,
				2163	<var>png32</var>, <var>png48</var>,
				2164	<var>png64</var>, and <var>png00</var>.
				2165	This property can be useful for specifying
				2166	the specific PNG format to be used, when the usual method of prepending the
				2167	format name to the output filename is inconvenient, such as when writing
				2168	a PNG-encoded ICO file or when using <a href="mogrify.html">mogrify</a>.
				2169	Value = <var>png8</var> reduces the number of colors to 256,
				2170	only one of which may be fully transparent, if necessary. The other
				2171	values do not force any reduction of quality; it is an error to request
				2172	a format that cannot represent the image data without loss (except that
				2173	it is allowed to reduce the bit-depth from 16 to 8 for all formats).
				2174	Value = <var>png24</var> and <var>png48</var>
				2175	allow transparency, only if a single color is fully transparent and that
				2176	color does not also appear in an opaque pixel; such transparency is
				2177	written in a PNG <code>tRNS</code> chunk.
				2178	Value = <var>png00</var> causes the image to inherit its
				2179	color-type and bit-depth from the input image, if the input was also
				2180	a PNG.</td>
				2181	</tr>
				2182
				2183	<tr>
				2184	<td>png:exclude-chunk=<var>value</var></td>
				2185
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2186	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2187	<td>png:include-chunk=<var>value</var></td>
				2188	<td>ancillary chunks to be excluded from or included in PNG output.
				2189
				2190	<p>The <var>value</var> can be the name of a PNG chunk-type such
				2191	as <var>bKGD</var>, a comma-separated list of chunk-names
				2192	(which can include the word <var>date</var>, the word
				2193	<var>all</var>, or the word <var>none</var>).
				2194	Although PNG chunk-names are case-dependent, you can use all lowercase
				2195	names if you prefer.</p>
				2196
				2197	<p>The "include-chunk" and "exclude-chunk" lists only affect the behavior
				2198	of the PNG encoder and have no effect on the PNG decoder.</p>
				2199
				2200	<p>As a special case, if the <code>sRGB</code> chunk is excluded and
				2201	the <code>gAMA</code> chunk is included, the <code>gAMA</code> chunk will
				2202	only be written if gamma is not 1/2.2, since most decoders assume
				2203	sRGB and gamma=1/2.2 when no colorspace information is included in
				2204	the PNG file. Because the list is processed from left to right, you
				2205	can achieve this with a single define:</p>
				2206
				2207	<pre>
				2208	-define png:include-chunk=none,gAMA
				2209	</pre>
				2210
				2211	<p>As a special case, if the <code>sRGB</code> chunk is not excluded and
				2212	the PNG encoder recognizes that the image contains the sRGB ICC profile,
				2213	the PNG encoder will write the <code>sRGB</code> chunk instead of the
				2214	entire ICC profile. To force the PNG encoder to write the sRGB
				2215	profile as an <code>iCCP</code> chunk in the output PNG instead of the
				2216	<code>sRGB</code> chunk, exclude the <code>sRGB</code> chunk.</p>
				2217
				2218	<p>The critical PNG chunks <code>IHDR</code>, <code>PLTE</code>,
				2219	<code>IDAT</code>, and <code>IEND</code> cannot be excluded. Any such
				2220	entries appearing in the list will be ignored.</p>
				2221
				2222	<p>If the ancillary PNG <code>tRNS</code> chunk is excluded and the
				2223	image has transparency, the PNG colortype is forced to be 4 or 6
				2224	(GRAY_ALPHA or RGBA). If the image is not transparent, then the
				2225	<code>tRNS</code> chunk isn't written anyhow, and there is no effect
				2226	on the PNG colortype of the output image.</p>
				2227
				2228	<p>The <a href="command-line-options.html#strip">-strip</a> option does the equivalent of the
				2229	following for PNG output:</p>
				2230
				2231	<pre>
				2232	-define png:exclude-chunk=EXIF,iCCP,iTXt,sRGB,tEXt,zCCP,zTXt,date
				2233	</pre>
				2234
				2235	<p>The default behavior is to include all known PNG ancillary chunks
				2236	plus ImageMagick's private <code>vpAg</code> ("virtual page") chunk,
				2237	and to exclude all PNG chunks that are unknown to ImageMagick,
				2238	regardless of their PNG "copy-safe" status as described in the
				2239	PNG specification.</p>
				2240
				2241	<p>Any chunk names that are not known to ImageMagick are ignored
				2242	if they appear in either the "include-chunk" or "exclude-chunk" list.
				2243	The ancillary chunks currently known to ImageMagick are
				2244	<code>bKGD</code>, <code>cHRM</code>, <code>gAMA</code>, <code>iCCP</code>,
				2245	<code>oFFs</code>, <code>pHYs</code>, <code>sRGB</code>, <code>tEXt</code>,
				2246	<code>tRNS</code>, <code>vpAg</code>, and <code>zTXt</code>.</p>
				2247
				2248	<p>You can also put <code>date</code> in the list to include or exclude
				2249	the "Date:create" and "Date:modify" text chunks that ImageMagick normally
				2250	inserts in the output PNG.</p></td>
				2251	</tr>
				2252
				2253	<tr>
				2254	<td>png:preserve-colormap[=<var>true</var>]</td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2255	<td>Use the existing image->colormap. Normally the PNG encoder will
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2256	try to optimize the palette, eliminating unused entries and putting
				2257	the transparent colors first. If this flag is set, that behavior
				2258	is suppressed.</td>
				2259	</tr>
				2260
				2261	<tr>
				2262	<td>png:preserve-iCCP[=<var>true</var>]</td>
				2263	<td>By default, the PNG decoder and encoder examine any ICC profile
				2264	that is present, either from an <code>iCCP</code> chunk in the PNG
				2265	input or supplied via an option, and if the profile is recognized
				2266	to be the sRGB profile, converts it to the <code>sRGB</code> chunk.
				2267	You can use <code>-define png:preserve-iCCP</code> to prevent
				2268	this from happening; in such cases the <code>iCCP</code> chunk
				2269	will be read or written and no <code>sRGB</code> chunk will be
				2270	written. There are some ICC profiles that claim to be sRGB but
				2271	have various errors that cause them to be rejected by libpng16; such
				2272	profiles are recognized anyhow and converted to the <code>sRGB</code>
				2273	chunk, but are rejected if the <code>-define png:preserve-iCCP</code>
				2274	is present. Note that not all "sRGB" ICC profiles are recognized
				2275	yet; we will add them to the list as we encounter them.</td>
				2276	</tr>
				2277
				2278	<tr>
				2279	<td>png:swap-bytes[=<var>true</var>]</td>
				2280	<td>The PNG specification requires that any multi-byte integers be stored in
				2281	network byte order (MSB-LSB endian). This option allows you to
				2282	fix any invalid PNG files that have 16-bit samples stored incorrectly
				2283	in little-endian order (LSB-MSB). The "-define png:swap-bytes" option
				2284	must appear before the input filename on the commandline. The swapping
				2285	is done during the libpng decoding operation.</td>
				2286	</tr>
				2287
				2288	<tr>
				2289	<td>profile:skip=<var>name1,name2,...</var></td>
				2290	<td>Skip the named profile[s] when reading the image. Use skip="*" to
				2291	skip all named profiles in the image. Many named profiles exist,
				2292	including ICC, EXIF, APP1, IPTC, XMP, and others.</td>
				2293	</tr>
				2294
				2295	<tr>
				2296	<td>ps:imagemask</td>
				2297	<td>If the ps:imagemask flag is defined, the PS3 and EPS3 coders will
				2298	create Postscript files that render bilevel images with the Postscript
				2299	imagemask operator instead of the image operator.</td>
				2300	</tr>
				2301
				2302	<tr>
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame]	2303	<td>psd:additional-info=all\|selective</td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2304	<td>This option should only be used when converting from a PSD file to
				2305	another PSD file. This should be placed after the image is read. The two
				2306	options are 'all' and 'selective'. The 'selective' option will preserve
				2307	all additional information that is not related to the geometry of the
				2308	image. The 'all' option should only be used when the geometry of the
				2309	image has not been changed. This option is helpful when transferring
				2310	non-simple layers, such as adjustment layers from the input PSD file to
				2311	the output PSD file. If this option is not used, the additional
				2312	information will not be preserved. This define is available as of
				2313	Imagemagick version 6.9.5-8.
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame]	2314	</td>
				2315	</tr>
				2316
				2317	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2318	<td>psd:alpha-unblend=off</td>
				2319	<td>Disables new automatic un-blending of transparency with the base image
				2320	for the flattened layer 0 before adding the alpha channel to the output
				2321	image. This define must be placed before the input psd image. (Available
				2322	as of IM 6.9.2.5). The automatic un-blending is new to IM 6.9.2.5 and
				2323	prevents the transparency from being applied twice in the output
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame]	2324	image. This option should be set before reading the image.</td>
				2325	</tr>
				2326
				2327	<tr>
				2328	<td>psd:preserve-opacity-mask=true</td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2329	<td>This option should only be used when converting from a PSD file to
				2330	another PSD file. It will preserve the opacity mask of a layer and add it
				2331	back to the layer when the image is saved. Setting this to 'true' will
				2332	enable this feature. This define is available as of Imagemagick version
				2333	6.9.5-10.
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame]	2334	</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2335	</tr>
				2336
				2337	<tr>
Cristy	1f1f3a0	2016-06-01 07:25:42 -0400	[diff] [blame]	2338	<td>preserve-timestamp=<var>{True, False}</var></td>
				2339	<td>Preserve file timestamp (<code>mogrify</code> only).</td>
				2340	</tr>
				2341
				2342	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2343	<td>quantum:format=<var>type</var></td>
				2344	<td>Set the type to <code>floating-point</code> to specify a floating-point
				2345	format for raw files (e.g. GRAY:) or for MIFF and TIFF images in HDRI mode
				2346	to preserve negative values. If <a href="command-line-options.html#depth">-depth</a> 16 is
				2347	included, the result is a single precision floating point format.
				2348	If <a href="command-line-options.html#depth">-depth</a> 32 is included, the result is
				2349	double precision floating point format.</td>
				2350	</tr>
				2351
				2352	<tr>
				2353	<td>quantum:polarity=<var>photometric-interpretation</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2354	<td>Set the photometric-interpretation of an image (typically for TIFF
				2355	image file format) to either <code>min-is-black</code> (default) or
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2356	<code>min-is-white</code>.</td>
				2357	</tr>
				2358
				2359	<tr>
				2360	<td>sample:offset=<var>geometry</var></td>
				2361	<td>Location of the sampling point within the sub-region being sampled,
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2362	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]	2363	</tr>
				2364
				2365	<tr>
				2366	<td>showkernel=<var>1</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2367	<td>Outputs (to 'standard error') all the information about a generated <a
				2368	href="command-line-options.html#morphology" >-morphology</a> kernel.</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2369	</tr>
				2370
				2371	<tr>
				2372	<td>stream:buffer-size=<var>value</var></td>
				2373	<td>Set the stream buffer size. Select 0 for unbuffered I/O.</td>
				2374	</tr>
				2375
				2376	<tr>
				2377	<td>tiff:alpha=<var>associated\|unassociated\|unspecified</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2378	<td>Specify the alpha extra samples as associated, unassociated or
				2379	unspecified </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2380	</tr>
				2381
				2382	<tr>
				2383	<td>tiff:endian=<var>msb\|lsb</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2384	<td> </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2385	</tr>
				2386
				2387	<tr>
				2388	<td>tiff:exif-properties=<var>false</var></td>
				2389	<td>Skips reading the EXIF properties.</td>
				2390	</tr>
				2391
				2392	<tr>
				2393	<td>tiff:fill-order=<var>msb\|lsb</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2394	<td> </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2395	</tr>
				2396
				2397	<tr>
				2398	<td>tiff:ignore-layers=<var>true</var></td>
				2399	<td>Ignores the photoshop layers.</td>
				2400	</tr>
				2401
				2402	<tr>
				2403	<td>tiff:ignore-tags=<var>comma-separate-list-of-tag-IDs</var></td>
				2404	<td>Allows one or more tag ID values to be ignored.</td>
				2405	</tr>
				2406
				2407	<tr>
				2408	<td>tiff:rows-per-strip=<var>value</var></td>
				2409	<td>Sets the number of rows per strip</td>
				2410	</tr>
				2411
				2412	<tr>
				2413	<td>tiff:tile-geometry=<var>WxH</var></td>
				2414	<td>Sets the tile size for pyramid tiffs. Requires the suffix
				2415	PTIF: before the outputname</td>
				2416	</tr>
Cristy	e09ed31	2016-03-06 08:07:39 -0500	[diff] [blame]	2417
				2418	<tr>
				2419	<td>type:features=<var>string</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2420	<td> </td>
Cristy	e09ed31	2016-03-06 08:07:39 -0500	[diff] [blame]	2421	</tr>
				2422
				2423	<tr>
				2424	<td>type:hinting=<var>off</var></td>
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	2425	<td> </td>
Cristy	e09ed31	2016-03-06 08:07:39 -0500	[diff] [blame]	2426	</tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2427	</table>
				2428
				2429	<p>For example, to create a postscript file that will render only the black
				2430	pixels of a bilevel image, use:</p>
				2431
				2432	<pre>
				2433	convert bilevel.tif -define ps:imagemask eps3:stencil.ps
				2434	</pre>
				2435
				2436	<p>Set attributes of the image registry by prefixing the value with
				2437	<code>registry:</code>. For example, to set a temporary path to put work files,
				2438	use:</p>
				2439
				2440	<pre>
				2441	-define registry:temporary-path=/data/tmp
				2442	</pre>
				2443
				2444	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2445	<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]	2446	</div>
				2447
				2448	<p class="magick-description">display the next image after pausing.</p>
				2449
				2450	<p>This option is useful for regulating the animation of image sequences
				2451	<var>ticks/ticks-per-second</var> seconds must expire before the display of the
				2452	next image. The default is no delay between each showing of the image
				2453	sequence. The default ticks-per-second is 100.</p>
				2454
				2455	<p>Use <code>></code> to change the image delay <var>only</var> if its current
				2456	value exceeds the given delay. <code><</code> changes the image delay
				2457	<var>only</var> if current value is less than the given delay. For example, if
				2458	you specify <code>30></code> and the image delay is 20, the image delay does
				2459	not change. However, if the image delay is 40 or 50, the delay it is changed
				2460	to 30. Enclose the given delay in quotation marks to prevent the
				2461	<code><</code> or <code>></code> from being interpreted by your shell as
				2462	a file redirection.</p>
				2463
				2464
				2465	<div style="margin: auto;">
				2466	<h3 class="magick-header"><a id="delete"></a>-delete <var>indexes</var></h3>
				2467	</div>
				2468
				2469	<p class="magick-description">delete the images specified by index, from the image sequence.</p>
				2470
				2471	<p>Specify the image by its index in the sequence. The first image is index
				2472	0. Negative indexes are relative to the end of the sequence, for example, -1
				2473	represents the last image of the sequence. Specify a range of images with
				2474	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]	2475	<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]	2476
				2477
				2478	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2479	<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]	2480	</div>
				2481
				2482	<p class="magick-description">Set the horizontal and vertical resolution of an image for rendering to devices.</p>
				2483
				2484	<p>This option specifies the image resolution to store while encoding a raster
				2485	image or the canvas resolution while rendering (reading) vector formats such
				2486	as Postscript, PDF, WMF, and SVG into a raster image. Image resolution
				2487	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]	2488	raster image. The default unit of measure is in dots per inch (DPI). The <a
				2489	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]	2490	instead.</p>
				2491
				2492	<p>The default resolution is 72 dots per inch, which is equivalent to one
				2493	point per pixel (Macintosh and Postscript standard). Computer screens are
				2494	normally 72 or 96 dots per inch, while printers typically support 150, 300,
				2495	600, or 1200 dots per inch. To determine the resolution of your display, use
				2496	a ruler to measure the width of your screen in inches, and divide by the
				2497	number of horizontal pixels (1024 on a 1024x768 display).</p>
				2498
				2499	<p>If the file format supports it, this option may be used to update the
				2500	stored image resolution. Note that Photoshop stores and obtains image
				2501	resolution from a proprietary embedded profile. If this profile is not
				2502	stripped from the image, then Photoshop will continue to treat the image using
				2503	its former resolution, ignoring the image resolution specified in the standard
				2504	file header.</p>
				2505
				2506	<p>The <a href="command-line-options.html#density">-density</a> option sets an <var>attribute</var> and
				2507	does not alter the underlying raster image. It may be used to adjust the
				2508	rendered size for desktop publishing purposes by adjusting the scale applied
				2509	to the pixels. To resize the image so that it is the same size at a different
				2510	resolution, use the <a href="command-line-options.html#resample">-resample</a> option.</p>
				2511
				2512	<div style="margin: auto;">
				2513	<h3 class="magick-header"><a id="depth"></a>-depth <var>value</var></h3>
				2514	</div>
				2515
				2516	<p class="magick-description">depth of the image.</p>
				2517
				2518	<p>This the number of bits in a color sample within a pixel. Use this option
				2519	to specify the depth of raw images whose depth is unknown such as GRAY, RGB,
				2520	or CMYK, or to change the depth of any image after it has been read.</p>
				2521
				2522	<div style="margin: auto;">
				2523	<h3 class="magick-header"><a id="descend"></a>-descend</h3>
				2524	</div>
				2525
				2526	<p class="magick-description">obtain image by descending window hierarchy.</p>
				2527
				2528	<div style="margin: auto;">
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	2529	<h3 class="magick-header"><a id="deskew"></a>-deskew <var>threshold{%}</var></h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2530	</div>
				2531
				2532	<p class="magick-description">straighten an image. A threshold of 40% works for most images.</p>
				2533
				2534	<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]	2535	<var>true \| false</var></code> to auto crop the image.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2536
				2537	<div style="margin: auto;">
				2538	<h3 class="magick-header"><a id="despeckle"></a>-despeckle</h3>
				2539	</div>
				2540
				2541	<p class="magick-description">reduce the speckles within an image.</p>
				2542
				2543	<div style="margin: auto;">
				2544	<h3 class="magick-header"><a id="direction"></a>-direction <var>type</var></h3>
				2545	</div>
				2546
				2547	<p class="magick-description">render text right-to-left or left-to-right.</p>
				2548
				2549	<div style="margin: auto;">
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	2550	<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]	2551	</div>
				2552
				2553	<p class="magick-description">shift image pixels as defined by a displacement map.</p>
				2554
				2555	<p>With this option, the 'overlay' image, and optionally the 'mask' image,
				2556	is used as a displacement map, which is used to displace the lookup of
				2557	what part of the 'background' image is seen at each point of the overlaid
				2558	area. Much like the displacement map is a 'lens' that redirects light shining
				2559	through it so as to present a distorted view the original 'background' image
				2560	behind it. </p>
				2561
				2562	<p>Any perfect grey areas of the displacement map produce a zero
				2563	displacement of the image. Black areas produce the given maximum negative
				2564	displacement of the lookup point, while white produce a maximum positive
				2565	displacement of the lookup. </p>
				2566
				2567	<p>Note that it is the lookup of the 'background' that is displaced, not a
				2568	displacement of the image itself. As such an area of the displacement map
				2569	containing 'white' will have the lookup point 'shifted' by a positive amount,
				2570	and thus generating a copy of the destination image to the right/downward from
				2571	the correct position. That is the image will look like it may have been
				2572	'shifted' in a negative left/upward direction. Understanding this is a very
				2573	important in understanding how displacement maps work. </p>
				2574
				2575	<p>The given arguments define the maximum amount of displacement in pixels
				2576	that a particular map can produce. If the displacement scale is large enough
				2577	it is also possible to lookup parts of the 'background' image that lie well
				2578	outside the bounds of the displacement map itself. That is you could very
				2579	easily copy a section of the original image from outside the overlay area
				2580	into the overlay area. </p>
				2581
				2582	<p>The '%' flag makes the displacement scale relative to the size of the
				2583	overlay image (100% = half width/height of image). Using '!' switches
				2584	percentage arguments to refer to the destination image size instead.
				2585	these flags were added as of IM v6.5.3-5.</p>
				2586
				2587	<p>Normally a single grayscale displacement map is provided, which with the
				2588	given scaling values will determine a single direction (vector) in which
				2589	displacements can occur (positively or negatively). However, if you also
				2590	specify a third image which is normally used as a <var>mask</var>,
				2591	the <var>composite image</var> is used for horizontal X
				2592	displacement, while the <var>mask image</var> is used for vertical Y
				2593	displacement. This allows you to define completely different displacement
				2594	values for the X and Y directions, and allowing you to lookup any point within
				2595	the <var>scale</var> bounds. In other words each pixel can lookup
				2596	any other nearby pixel, producing complex 2 dimensional displacements, rather
				2597	than a simple 1 dimensional vector displacements. </p>
				2598
				2599	<p>Alternatively rather than supplying two separate images, as of IM v6.4.4-0,
				2600	you can use the 'red' channel of the overlay image to specify the horizontal
				2601	or X displacement, and the 'green' channel for the vertical or Y displacement.
				2602	</p>
				2603
				2604	<p>As of IM v6.5.3-5 any alpha channel in the overlay image is used as a
				2605	mask the transparency of the destination image. However areas outside the
				2606	overlaid areas will not be effected. </p>
				2607
				2608
				2609	<div style="margin: auto;">
				2610	<h3 class="magick-header"><a id="display"></a>-display <var>host:display[.screen]</var></h3>
				2611	</div>
				2612
				2613	<p class="magick-description">Specifies the X server to contact.</p>
				2614
				2615	<p>This option is used with convert for obtaining image or font from this
				2616	X server. See <var>X(1)</var>.</p>
				2617
				2618	<div style="margin: auto;">
				2619	<h3 class="magick-header"><a id="dispose"></a>-dispose <var>method</var></h3>
				2620	</div>
				2621
				2622	<p class="magick-description">define the GIF disposal image setting for images that are being created or read in. </p>
				2623
				2624	<p>The layer disposal method defines the way each the displayed image is to be
				2625	modified after the current 'frame' of an animation has finished being
				2626	displayed (after its 'delay' period), but before the next frame on an
				2627	animation is to be overlaid onto the display. </p>
				2628
				2629	<p>Here are the valid methods:</p>
				2630
				2631	<dl class="dl-horizontal">
				2632	<dt>Undefined</dt><dd>0: No disposal specified (equivalent to '<code>none</code>').</dd>
				2633	<dt>None</dt><dd>1: Do not dispose, just overlay next frame image.</dd>
				2634	<dt>Background</dt><dd>2: Clear the frame area with the background color.</dd>
				2635	<dt>Previous</dt><dd>3: Clear to the image prior to this frames overlay.</dd>
				2636	</dl>
				2637
				2638	<p>You can also use the numbers given above, which is what the GIF format
				2639	uses internally to represent the above settings. </p>
				2640
				2641	<p>To print a complete list of dispose methods, use <a href="command-line-options.html#list">-list dispose</a>.</p>
				2642
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2643	<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]	2644	resetting the layer disposal methods of images being read in. </p>
				2645
				2646	<p>Use <a href="command-line-options.html#set">-set</a> '<code>dispose</code>' method to set the image
				2647	disposal method for images already in memory.</p>
				2648
				2649	<div style="margin: auto;">
				2650	<h3 class="magick-header"><a id="dissimilarity-threshold"></a>-dissimilarity-threshold <var>value</var></h3>
				2651	</div>
				2652
				2653	<p class="magick-description">maximum RMSE for subimage match (default 0.2).</p>
				2654
				2655
				2656	<div style="margin: auto;">
				2657	<h3 class="magick-header"><a id="dissolve"></a>-dissolve <var>src_percent</var>[x<var>dst_percent</var>]</h3>
				2658	</div>
				2659
				2660	<p class="magick-description">dissolve an image into another by the given percent.</p>
				2661
				2662	<p>The opacity of the composite image is multiplied by the given percent, then
				2663	it is composited 'over' the main image. If <var>src_percent</var>
				2664	is greater than 100, start dissolving the main image so it becomes
				2665	transparent at a value of '<code>200</code>'. If both percentages
				2666	are given, each image are dissolved to the percentages given. </p>
				2667
				2668	<p>Note that dissolve percentages do not add, two opaque images dissolved
				2669	'50,50', produce a 75% transparency. For a 50% + 50% blending of the two
				2670	images, you would need to use dissolve values of '50,100'. </p>
				2671
				2672	<div style="margin: auto;">
				2673	<h3 class="magick-header"><a id="distort"></a>-distort <var>method arguments</var></h3>
				2674	</div>
				2675
				2676	<p class="magick-description">distort an image, using the given <var>method</var> and its required <var>arguments</var>.</p>
				2677
				2678	<p>The <var>arguments</var> is a single string containing a list
				2679	of floating point numbers separated by commas or spaces. The number of
				2680	and meaning of the floating point values depends on the distortion <var>method</var> being used. </p>
				2681
				2682	<p>Choose from these distortion types:</p>
				2683
				2684	<table class="table table-condensed table-striped">
				2685	<tr>
				2686	<th style="width: 8%">Method</th>
				2687	<th>Description</th>
				2688	</tr>
				2689
				2690	<tr>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2691	<td>ScaleRotateTranslate <br/> SRT</td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2692	<td>
				2693	Distort image by first scaling and rotating about a given 'center',
				2694	before translating that 'center' to the new location, in that order. It
				2695	is an alternative method of specifying a 'Affine' type of
				2696	distortion, but without shearing effects. It also provides a good way
				2697	of rotating and displacing a smaller image for tiling onto a larger
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2698	background (IE 2-dimensional animations). <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2699
				2700	The number of arguments determine the specific meaning of each
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2701	argument for the scales, rotation, and translation operations. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2702
				2703	<dl class="dl-horizontal">
				2704	<dt>2:</dt><dd><var>Scale Angle</var></dd>
				2705	<dt>3:</dt><dd><var>X,Y Angle</var></dd>
				2706	<dt>4:</dt><dd><var>X,Y Scale Angle</var></dd>
				2707	<dt>5:</dt> <dd><var>X,Y ScaleX,ScaleY Angle</var></dd>
				2708	<dt>6:</dt> <dd><var>X,Y Scale Angle NewX,NewY</var></dd>
				2709	<dt>7:</dt> <dd><var>X,Y ScaleX,ScaleY Angle NewX,NewY</var></dd>
				2710	</dl>
				2711
				2712	This is actually an alternative way of specifying a 2 dimensional linear
				2713	'Affine' or 'AffineProjection' distortion. </td> </tr>
				2714
				2715	<tr>
				2716	<td>Affine</td>
				2717	<td>
				2718	Distort the image linearly by moving a list of at least 3 or more sets
				2719	of control points (as defined below). Ideally 3 sets or 12 floating
				2720	point values are given allowing the image to be linearly scaled,
				2721	rotated, sheared, and translated, according to those three points. See
				2722	also the related 'AffineProjection' and 'SRT'
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2723	distortions. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2724
				2725	More than 3 sets given control point pairs (12 numbers) is least
				2726	squares fitted to best match a linear affine distortion. If only 2
				2727	control point pairs (8 numbers) are given a two point image translation
				2728	rotation and scaling is performed, without any possible shearing,
				2729	flipping or changes in aspect ratio to the resulting image. If only one
				2730	control point pair is provides the image is only translated, (which may
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2731	be a floating point non-integer translation). <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2732
				2733	This distortion does not include any form of perspective distortion.
				2734	</td>
				2735
				2736	</tr>
				2737
				2738	<tr>
				2739	<td>AffineProjection</td>
				2740	<td>
				2741	Linearly distort an image using the given Affine Matrix of 6
				2742	pre-calculated coefficients forming a set of Affine Equations to map
				2743	the source image to the destination image.
				2744
				2745	<p class="text-center"><var>
				2746	s<sub>x</sub>, r<sub>x</sub>,
				2747	r<sub>y</sub>, s<sub>y</sub>,
				2748	t<sub>x</sub>, t<sub>y</sub>
				2749	</var></p>
				2750
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2751	See <a href="command-line-options.html#affine" >-affine</a> setting for more detail, and
				2752	meanings of these coefficients. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2753
				2754	The distortions 'Affine' and 'SRT' provide
				2755	alternative methods of defining this distortion, with ImageMagick doing
				2756	the calculations needed to generate the required coefficients. You can
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2757	see the internally generated coefficients, by using a <a
				2758	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]	2759
				2760	</tr>
				2761
				2762	<tr>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2763	<td>BilinearForward<br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2764	BilinearReverse</td>
				2765	<td>
				2766	Bilinear Distortion, given a minimum of 4 sets of coordinate pairs, or
				2767	16 values (see below). Not that lines may not appear straight after
				2768	distortion, though the distance between coordinates will remain
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2769	consistent. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2770
				2771	The 'BilinearForward' is used to map rectangles to any
				2772	quadrilateral, while the 'BilinearReverse' form maps any
				2773	quadrilateral to a rectangle, while preserving the straight line edges
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2774	in each case. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2775
				2776	Note that 'BilinearForward' can generate invalid pixels
Cristy	f650f4f	2016-04-01 10:53:07 -0400	[diff] [blame]	2777	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]	2778	color setting. Also if the quadrilateral becomes 'flipped' the image
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2779	may disappear. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2780
				2781	There are future plans to produce a true Bilinear distortion that will
				2782	attempt to map any quadrilateral to any other quadrilateral, while
				2783	preserving edges (and edge distance ratios).
				2784
				2785	</td>
				2786	</tr>
				2787
				2788	<tr>
				2789	<td>Perspective</td>
				2790	<td>
				2791	Perspective distort the images, using a list of 4 or more sets of
				2792	control points (as defined below). More that 4 sets (16 numbers) of
				2793	control points provide least squares fitting for more accurate
				2794	distortions (for the purposes of image registration and panorama
				2795	effects). Less than 4 sets will fall back to a 'Affine'
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2796	linear distortion. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2797
				2798	Perspective Distorted images ensures that straight lines remain
				2799	straight, but the scale of the distorted image will vary. The horizon
				2800	is anti-aliased, and the 'sky' color may be set using the
Cristy	f650f4f	2016-04-01 10:53:07 -0400	[diff] [blame]	2801	<a href="command-line-options.html#alpha-color" >-alpha-color</a> setting. </td>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2802	</tr>
				2803
				2804	<tr>
				2805	<td>PerspectiveProjection </td>
				2806	<td>
				2807	Do a 'Perspective' distortion biased on a set of 8
				2808	pre-calculated coefficients. You can get these coefficients by looking
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2809	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]	2810	'Perspective' distortion, or by calculating them yourself.
				2811	If the last two perspective scaling coefficients are zero, the
				2812	remaining 6 represents a transposed 'Affine Matrix'. </td>
				2813
				2814	</tr>
				2815
				2816	<tr>
				2817	<td>Arc</td>
				2818	<td>
				2819	Arc the image (variation of polar mapping) over the angle given around
				2820	a circle.
				2821
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2822	<p><dl class="dl-horizontal">
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2823	<dt>arc_angle</dt>
				2824	<dd>The angle over which to arc the image side-to-side</dd>
				2825	<dt>rotate_angle</dt>
				2826	<dd>Angle to rotate resulting image from vertical center</dd>
				2827	<dt>top_radius</dt>
				2828	<dd>Set top edge of source image at this radius</dd>
				2829	<dt>bottom_radius </dt>
				2830	<dd>Set bottom edge to this radius (radial scaling)</dd>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2831	</dl></p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2832
				2833	The resulting image is always resized to best fit the resulting image,
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2834	(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]	2835	preserve scale and aspect ratio of the original image as much as
				2836	possible with the arguments given by the user. All four arguments will
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2837	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]	2838
				2839	This a variation of a polar distortion designed to try to preserve the
				2840	aspect ratio of the image rather than direct Cartesian to Polar
				2841	conversion. </td>
				2842	</tr>
				2843
				2844	<tr>
				2845	<td>Polar</td>
				2846	<td>
				2847	Like 'Arc' but do a complete Cartesian to Polar mapping of
				2848	the image. that is the height of the input image is mapped to the
				2849	radius limits, while the width is wrapped around between the
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2850	angle limits. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2851
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2852	Arguments: <var>Rmax,Rmin CenterX,CenterY, start,end_angle</var> <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2853
				2854	All arguments are optional. With <var>Rmin</var> defaulting to zero, the
				2855	center to the center of the image, and the angles going from -180 (top)
				2856	to +180 (top). If <var>Rmax</var> is given the special value of
				2857	'0', the the distance from the center to the nearest edge
				2858	is used for the radius of the output image, which will ensure the whole
				2859	image is visible (though scaled smaller). However a special value of
				2860	'-1' will use the distance from the center to the furthest
				2861	corner, This may 'clip' the corners from the input rectangular image,
				2862	but will generate the exact reverse of a 'DePolar' with
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2863	the same arguments. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2864
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2865	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]	2866	output image center will default to 0,0 of the virtual
				2867	canvas, and the image size adjusted to ensure the whole input image is
				2868	made visible in the output image on the virtual canvas. </td>
				2869
				2870	</tr>
				2871
				2872	<tr>
				2873	<td>DePolar</td>
				2874	<td>
				2875	Uses the same arguments and meanings as a 'Polar' distortion
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2876	but generates the reverse Polar to Cartesian distortion. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2877
				2878	The special <var>Rmax</var> setting of '0' may however clip
				2879	the corners of the input image. However using the special
				2880	<var>Rmax</var> setting of '-1' (maximum center to corner
				2881	distance) will ensure the whole distorted image is preserved in the
				2882	generated result, so that the same argument to 'Polar' will
				2883	reverse the distortion re-producing the original.
				2884
				2885	Note that as this distortion requires the area resampling of a circular
				2886	arc, which can not be handled by the builtin EWA resampling function.
				2887	As such the normal EWA filters are turned off. It is recommended some
				2888	form of 'super-sampling' image processing technique be used to produce
				2889	a high quality result. </td>
				2890
				2891	</tr>
				2892
				2893	<tr>
				2894	<td>Barrel</td>
				2895	<td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2896	Given the four coefficients (A,B,C,D) as defined by <a
				2897	href="http://wiki.panotools.org/Lens_correction_model" >Helmut
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2898	Dersch</a>, perform a barrel or pin-cushion distortion appropriate to
				2899	correct radial lens distortions. That is in photographs, make straight
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2900	lines straight again. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2901
				2902	<p class="text-center">Arguments: <var>A B C</var> [ <var>D</var> [
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2903	<var>X</var> , <var>Y</var> ] ] <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2904	or <var>A<sub>x</sub> B<sub>x</sub> C<sub>x</sub> D<sub>x</sub>
				2905	A<sub>y</sub> B<sub>y</sub> C<sub>y</sub> D<sub>y</sub></var>
				2906	[ <var>X</var> , <var>Y</var> ] </p>
				2907	So that it forms the function
				2908	<p class="text-center">Rsrc = r * ( <var>A</var>r<sup>3</sup> + <var>B</var>r<sup>2</sup> +
				2909	<var>C</var>*r + <var>D</var> )</p>
				2910
				2911	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]	2912	(defaulting to the center of the image). <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2913	The second form is typically used to distort images, rather than
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2914	correct lens distortions. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2915	</td>
				2916
				2917	</tr>
				2918
				2919	<tr>
				2920	<td>BarrelInverse</td>
				2921	<td>
				2922	This is very similar to 'Barrel' with the same set of
				2923	arguments, and argument handling. However it uses the inverse
				2924	of the radial polynomial,
				2925	so that it forms the function
				2926	<p class="text-center">Rsrc = r / ( <var>A</var>r<sup>3</sup> + <var>B</var>r<sup>2</sup> +
				2927	<var>C</var>*r + <var>D</var> )</p>
				2928	Note that this is not the reverse of the 'Barrel'
				2929	distortion, just a different barrel-like radial distortion method.
				2930
				2931	</td>
				2932	</tr>
				2933
				2934	<tr>
				2935	<td>Shepards</td>
				2936	<td>
				2937	Distort the given list control points (any number) using an Inverse
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2938	Squared Distance Interpolation Method (<a
				2939	href="http://en.wikipedia.org/wiki/Shepard%27s_method" >Shepards
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2940	Method</a>). The control points in effect do 'localized' displacement
				2941	of the image around the given control point (preserving the look and
				2942	the rotation of the area near the control points. For best results
				2943	extra control points should be added to 'lock' the positions of the
				2944	corners, edges and other unchanging parts of the image, to prevent
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2945	their movement. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2946
				2947	The distortion has been likened to 'taffy pulling' using nails, or
				2948	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]	2949	position, distorting the surface of the jelly. <br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	2950
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	2951	Internally it is equivalent to generating a displacement map (see <a
				2952	href="command-line-options.html#displace" >-displace</a>) for source image color look-up using
				2953	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]	2954
				2955	</td>
				2956	</tr>
				2957
				2958	</table>
				2959
				2960	<p>To print a complete list of distortion methods, use <a href="command-line-options.html#list">-list
				2961	distort</a>.</p>
				2962
				2963	<p>Many of the above distortion methods such as '<code>Affine</code>',
				2964	'<code>Perspective</code>', and '<code>Shepards</code>' use a list control points
				2965	defining how these points in the given image should be distorted in the
				2966	destination image. Each set of four floating point values represent a source
				2967	image coordinate, followed immediately by the destination image coordinate.
				2968	This produces a list of values such as...</p>
				2969	<p class="text-center"><var>
				2970	U<sub>1</sub>,V<sub>1</sub> X<sub>1</sub>,Y<sub>1</sub>
				2971	U<sub>2</sub>,V<sub>2</sub> X<sub>2</sub>,Y<sub>2</sub>
				2972	U<sub>3</sub>,V<sub>3</sub> X<sub>3</sub>,Y<sub>3</sub>
				2973	...
				2974	U<sub>n</sub>,V<sub>n</sub> X<sub>n</sub>,Y<sub>n</sub>
				2975	</var></p>
				2976	<p>where <var>U,V</var> on the source image is mapped to <var>X,Y</var> on the
				2977	destination image. </p>
				2978
				2979	<p>For example, to warp an image using '<code>perspective</code>' distortion,
				2980	needs a list of at least 4 sets of coordinates, or 16 numbers. Here is the
				2981	perspective distortion of the built-in "rose:" image. Note how spaces were
				2982	used to group the 4 sets of coordinate pairs, to make it easier to read and
				2983	understand.</p>
				2984
				2985	<pre>
				2986	convert rose: -virtual-pixel black \
				2987	-distort Perspective '0,0,0,0 0,45,0,45 69,0,60,10 69,45,60,35' \
				2988	rose_3d_rotated.gif"
				2989	</pre>
				2990
				2991	<p>If more that the required number of coordinate pairs are given for
				2992	a distortion, the distortion method is 'least squares' fitted to produce the
				2993	best result for all the coordinate pairs given. If less than the ideal number
				2994	of points are given, the distort will generally fall back to a simpler form of
				2995	distortion that can handles the smaller number of coordinates (usually a linear
				2996	'<code>Affine</code>' distortion). </p>
				2997
				2998	<p>By using more coordinates you can make use of image registration tool to
				2999	find matching coordinate pairs in overlapping images, so as to improve the
				3000	'fit' of the distortion. Of course a bad coordinate pair can also make the
				3001	'fit' worse. Caution is always advised. </p>
				3002
				3003	<p>Colors are acquired from the source image according to a cylindrical
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3004	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]	3005	EWA resampling. This produces very high quality results, especially when
				3006	images become smaller (minified) in the output, which is very common when
				3007	using '<code>perspective</code>' distortion. For example here we view
				3008	a infinitely tiled 'plane' all the way to the horizon. </p>
				3009
				3010	<pre>
				3011	convert -size 90x90 pattern:checkerboard -normalize -virtual-pixel tile \
				3012	-distort perspective '0,0,5,45 89,0,45,46 0,89,0,89 89,89,89,89' \
				3013	checks_tiled.jpg
				3014	</pre>
				3015
				3016	<p>Note that a infinitely tiled perspective images involving the horizon can
				3017	be very slow, because of the number of pixels that are compressed to generate
				3018	each individual pixel close to the 'horizon'. You can turn off EWA
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3019	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]	3020	'<code>point</code>' (recommended if you plan to use super-sampling instead).
				3021	</p>
				3022
				3023	<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]	3024	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]	3025	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]	3026	what these pixels to be visible, set the color to match the rest of the
				3027	ground. </p>
				3028
				3029	<p>The output image size will by default be the same as the input image. This
				3030	means that if the part of the distorted image falls outside the viewed area of
				3031	the 'distorted space', those parts is clipped and lost. However if you use
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3032	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]	3033	will attempt (if possible) to show the whole of the distorted image, while
				3034	retaining a correct 'virtual canvas' offset, for image layering. This offset
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3035	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]	3036	is unwanted. </p>
				3037
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3038	<p>Setting <a href="command-line-options.html#verbose" >-verbose</a> setting, will cause <a
				3039	href="command-line-options.html#distort" >-distort</a> to attempt to output the internal coefficients,
				3040	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]	3041	and debugging purposes. This many not be available for all distorts. </p>
				3042
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3043	<p>You can alternatively specify a special "<code><a href="command-line-options.html#define"
				3044	>-define</a> distort:viewport={geometry_string}</code>" setting which will
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3045	specify the size and the offset of the generated 'viewport' image of the
				3046	distorted image space.</p>
				3047
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3048	<p>Setting a "<code><a href="command-line-options.html#define" >-define</a>
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	3049	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]	3050	otherwise) by that factor without changing the viewed contents of the
				3051	distorted image. This can be used either for 'super-sampling' the image for
				3052	a higher quality result, or for panning and zooming around the image (with
				3053	appropriate viewport changes, or post-distort cropping and resizing). </p>
				3054
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3055	<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]	3056	will output the cylindrical filter lookup table created by the EWA (Elliptical
				3057	Weighted Average) resampling algorithm. Note this table uses a squared radius
				3058	lookup value. This is typically only used for debugging EWA resampling. </p>
				3059
				3060
				3061	<div style="margin: auto;">
				3062	<h3 class="magick-header"><a id="distribute-cache"></a>-distribute-cache <var>port</var></h3>
				3063	</div>
				3064
				3065	<p class="magick-description">launch a distributed pixel cache server. </p>
				3066
				3067	<div style="margin: auto;">
				3068	<h3 class="magick-header"><a id="dither"></a>-dither <var>method</var></h3>
				3069	</div>
				3070
				3071	<p class="magick-description">Apply a Riemersma or Floyd-Steinberg error diffusion dither to
				3072	images when general color reduction is applied via an option, or automagically
				3073	when saving to specific formats. This enabled by default.</p>
				3074
				3075	<p>Dithering places two or more colors in neighboring pixels so that to the
				3076	eye a closer approximation of the images original color is reproduced. This
				3077	reduces the number of colors needed to reproduce the image but at the cost of
				3078	a lower level pattern of colors. Error diffusion dithers can use any set of
				3079	colors (generated or user defined) to an image. </p>
				3080
				3081	<p>Dithering is turned on by default, to turn it off use the plus form of the
				3082	setting, <a href="command-line-options.html#dither">+dither</a>. This will also also render PostScript
				3083	without text or graphic aliasing. Disabling dithering often (but not always)
				3084	leads to faster process, a smaller number of colors, but more cartoon like
				3085	image coloring. Generally resulting in 'color banding' effects in areas with
				3086	color gradients. </p>
				3087
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3088	<p>The color reduction operators <a href="command-line-options.html#colors">-colors</a>, <a
				3089	href="command-line-options.html#monochrome">-monochrome</a>, <a href="command-line-options.html#remap ">-remap</a>, and <a
				3090	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]	3091	color set they created. These operators are also used as part of automatic
				3092	color reduction when saving images to formats with limited color support, such
				3093	as <code>GIF:</code>, <code>XBM:</code>, and others, so dithering may also be used
				3094	in these cases. </p>
				3095
				3096	<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]	3097	to generate purely random dither. Or use <a
				3098	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]	3099	patterns, using uniform color maps, rather than specific color maps. </p>
				3100
				3101
				3102	<div style="margin: auto;">
				3103	<h3 class="magick-header"><a id="draw"></a>-draw <var>string</var></h3>
				3104	</div>
				3105
				3106	<p class="magick-description">Annotate an image with one or more graphic primitives.</p>
				3107
				3108	<p>Use this option to annotate or decorate an image with one or more graphic
				3109	primitives. The primitives include shapes, text, transformations, and pixel
				3110	operations.</p>
				3111
				3112	<p>The shape primitives:</p>
				3113
				3114	<dl class="dl-horizontal">
				3115	<dt>point</dt><dd> x,y</dd>
				3116	<dt>line</dt><dd> x0,y0 x1,y1</dd>
				3117	<dt>rectangle</dt><dd> x0,y0 x1,y1</dd>
				3118	<dt>roundRectangle</dt><dd> x0,y0 x1,y1 wc,hc</dd>
				3119	<dt>arc</dt><dd> x0,y0 x1,y1 a0,a1</dd>
				3120	<dt>ellipse</dt><dd> x0,y0 rx,ry a0,a1</dd>
				3121	<dt>circle</dt><dd> x0,y0 x1,y1</dd>
				3122	<dt>polyline</dt><dd> x0,y0 ... xn,yn</dd>
				3123	<dt>polygon</dt><dd> x0,y0 ... xn,yn</dd>
				3124	<dt>bezier</dt><dd> x0,y0 ... xn,yn</dd>
				3125	<dt>path</dt><dd>specification </dd>
				3126	<dt>image</dt><dd> operator x0,y0 w,h filename</dd>
				3127	</dl>
				3128
				3129	<p>The text primitive:</p>
				3130
				3131	<dl class="dl-horizontal">
				3132	<dt>text</dt><dd>x0,y0 string</dd>
				3133	</dl>
				3134	<p>The text gravity primitive:</p>
				3135
				3136	<dl class="dl-horizontal">
				3137	<dt>gravity</dt><dd>NorthWest, North, NorthEast, West, Center, East, SouthWest, South, or SouthEast</dd>
				3138	</dl>
				3139
				3140	<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]	3141	interact with the other primitives. It is equivalent to using the <a
				3142	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]	3143	scope to the <a href="command-line-options.html#draw">-draw</a> option in which it appears.</p>
				3144
				3145	<p>The transformation primitives:</p>
				3146
				3147	<dl class="dl-horizontal">
				3148	<dt>rotate</dt><dd>degrees</dd>
				3149	<dt>translate</dt><dd>dx,dy</dd>
				3150	<dt>scale</dt><dd>sx,sy</dd>
				3151	<dt>skewX</dt><dd>degrees</dd>
				3152	<dt>skewY</dt><dd>degrees</dd>
				3153	</dl>
				3154
				3155	<p>The pixel operation primitives:</p>
				3156
				3157	<dl class="dl-horizontal">
				3158	<dt>color</dt><dd>x0,y0 method</dd>
				3159	<dt>matte</dt><dd>x0,y0 method</dd>
				3160	</dl>
				3161
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3162	<p>The shape primitives are drawn in the color specified by the preceding <a
				3163	href="command-line-options.html#fill">-fill</a> setting. For unfilled shapes, use <a
				3164	href="command-line-options.html#fill">-fill none</a>. You can optionally control the stroke (the
				3165	"outline" of a shape) with the <a href="command-line-options.html#stroke">-stroke</a> and <a
				3166	href="command-line-options.html#strokewidth">-strokewidth</a> settings.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3167
				3168	<p>A <code>point</code> primitive is specified by a single <var>point</var> in the
				3169	pixel plane, that is, by an ordered pair of integer coordinates,
				3170	<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]	3171	primitive is not affected by <a href="command-line-options.html#stroke">-stroke</a> or <a
				3172	href="command-line-options.html#strokewidth">-strokewidth</a>.)</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3173
				3174	<p>A <code>line</code> primitive requires a start point and end point.</p>
				3175
				3176	<p>A <code>rectangle</code> primitive is specified by the pair of points at the
				3177	upper left and lower right corners.</p>
				3178
				3179	<p>A <code>roundRectangle</code> primitive takes the same corner points as
				3180	a <code>rectangle</code> followed by the width and height of the rounded corners
				3181	to be removed.</p>
				3182
				3183	<p>The <code>circle</code> primitive makes a disk (filled) or circle (unfilled).
				3184	Give the center and any point on the perimeter (boundary).</p>
				3185
				3186	<p>The <code>arc</code> primitive is used to inscribe an elliptical segment in
				3187	to a given rectangle. An <code>arc</code> requires the two corners used for
				3188	<code>rectangle</code> (see above) followed by the start and end angles of the
				3189	arc of the segment segment (e.g. 130,30 200,100 45,90). The start and end
				3190	points produced are then joined with a line segment and the resulting segment
				3191	of an ellipse is filled.</p>
				3192
				3193	<p>Use <code>ellipse</code> to draw a partial (or whole) ellipse. Give the
				3194	center point, the horizontal and vertical "radii" (the <var>semi-axes</var> of
				3195	the ellipse) and start and end angles in degrees (e.g. 100,100 100,150
				3196	0,360).</p>
				3197
				3198	<p>The <code>polyline</code> and <code>polygon</code> primitives require three or
				3199	more points to define their perimeters. A <code>polyline</code> is simply
				3200	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]	3201	point. When unfilled, this is a <var>polygonal line</var>. If the <a
				3202	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]	3203	a <code>polyline</code> is identical to a <code>polygon</code>. </p>
				3204
				3205	<p>A <var>coordinate</var> is a pair of integers separated by a space or
				3206	optional comma. </p>
				3207
				3208	<p>As an example, to define a circle centered at 100,100 that extends to
				3209	150,150 use:</p>
				3210
				3211	<pre>
				3212	-draw 'circle 100,100 150,150'
				3213	</pre>
				3214
				3215	<p>The <code>Bezier</code> primitive creates a spline curve and requires three
				3216	or points to define its shape. The first and last points are the
				3217	<var>knots</var> and these points are attained by the curve, while any
				3218	intermediate coordinates are <var>control points</var>. If two control points
				3219	are specified, the line between each end knot and its sequentially respective
				3220	control point determines the tangent direction of the curve at that end. If
				3221	one control point is specified, the lines from the end knots to the one
				3222	control point determines the tangent directions of the curve at each end. If
				3223	more than two control points are specified, then the additional control points
				3224	act in combination to determine the intermediate shape of the curve. In order
				3225	to draw complex curves, it is highly recommended either to use the
				3226	<code>path</code> primitive or to draw multiple four-point bezier segments with
				3227	the start and end knots of each successive segment repeated. For example:</p>
				3228
				3229	<pre>
				3230	-draw 'bezier 20,50 45,100 45,0 70,50'
				3231	-draw 'bezier 70,50 95,100 95,0 120,50'
				3232	</pre>
				3233
				3234	<p>A <code>path</code> represents an outline of an object, defined in terms of
				3235	moveto (set a new current point), lineto (draw a straight line), curveto (draw
				3236	a Bezier curve), arc (elliptical or circular arc) and closepath (close the
				3237	current shape by drawing a line to the last moveto) elements. Compound paths
				3238	(i.e., a path with subpaths, each consisting of a single moveto followed by
				3239	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]	3240	<var>donut holes</var> in objects. (See <a
				3241	href="http://www.w3.org/TR/SVG/paths.html">Paths</a>.)</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3242
				3243	<p>Use <code>image</code> to composite an image with another image. Follow the
				3244	image keyword with the composite operator, image location, image size, and
				3245	filename:</p>
				3246
				3247	<pre>
				3248	-draw 'image SrcOver 100,100 225,225 image.jpg'
				3249	</pre>
				3250
				3251	<p>You can use 0,0 for the image size, which means to use the actual
				3252	dimensions found in the image header. Otherwise, it is scaled to the given
Cristy	6549abb	2016-11-10 08:25:55 -0500	[diff] [blame]	3253	dimensions. See <a href="http://www.imagemagick.org/www/compose.html">Alpha Compositing</a> for
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3254	a detailed discussion of alpha composition methods that are available. </p>
				3255
				3256	<p>The "special augmented compose operators" such as "dissolve" that require
				3257	arguments cannot be used at present with the <code>-draw image</code> option.
				3258	</p>
				3259
				3260	<p>Use <code>text</code> to annotate an image with text. Follow the text
				3261	coordinates with a string. If the string has embedded spaces, enclose it in
				3262	single or double quotes.</p>
				3263
				3264	<p>For example, the following annotates the image with <code>Works like
				3265	magick!</code> for an image titled <code>bird.miff</code>. </p>
				3266
				3267	<pre>
				3268	-draw "text 100,100 'Works like magick!' "
				3269	</pre>
				3270
				3271	<p>See the <a href="command-line-options.html#annotate">-annotate</a> option for another convenient way
				3272	to annotate an image with text.</p>
				3273
				3274	<p>The <code>rotate</code> primitive rotates subsequent shape primitives and
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3275	text primitives about the origin of the main image. If the <a
				3276	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]	3277	option, the origin for transformations is the upper left corner of the
				3278	region.</p>
				3279
				3280	<p>The <code>translate</code> primitive translates subsequent shape and text
				3281	primitives.</p>
				3282
				3283	<p>The <code>scale</code> primitive scales them.</p>
				3284
				3285	<p>The <code>skewX</code> and <code>skewY</code> primitives skew them with respect
				3286	to the origin of the main image or the region.</p>
				3287
				3288	<p>The transformations modify the current affine matrix, which is initialized
				3289	from the initial affine matrix defined by the <a href="command-line-options.html#affine">-affine</a>
				3290	option. Transformations are cumulative within the <a href="command-line-options.html#draw">-draw</a>
				3291	option. The initial affine matrix is not affected; that matrix is only changed
				3292	by the appearance of another <a href="command-line-options.html#affine">-affine</a> option. If another
				3293	<a href="command-line-options.html#draw">-draw</a> option appears, the current affine matrix is
				3294	reinitialized from the initial affine matrix.</p>
				3295
				3296	<p>Use the <code>color</code> primitive to change the color of a pixel to the
				3297	fill color (see <a href="command-line-options.html#fill">-fill</a>). Follow the pixel coordinate with
				3298	a method:</p>
				3299
				3300	<pre>
				3301	point
				3302	replace
				3303	floodfill
				3304	filltoborder
				3305	reset
				3306	</pre>
				3307
				3308	<p>Consider the target pixel as that specified by your coordinate. The
				3309	<code>point</code> method recolors the target pixel. The <code>replace</code>
				3310	method recolors any pixel that matches the color of the target pixel.
				3311	<code>Floodfill</code> recolors any pixel that matches the color of the target
				3312	pixel and is a neighbor, whereas <code>filltoborder</code> recolors any neighbor
				3313	pixel that is not the border color. Finally, <code>reset</code> recolors all
				3314	pixels.</p>
				3315
				3316	<p>Use <code>matte</code> to the change the pixel matte value to transparent.
				3317	Follow the pixel coordinate with a method (see the <code>color</code> primitive
				3318	for a description of methods). The <code>point</code> method changes the matte
				3319	value of the target pixel. The <code>replace</code> method changes the matte
				3320	value of any pixel that matches the color of the target pixel.
				3321	<code>Floodfill</code> changes the matte value of any pixel that matches the
				3322	color of the target pixel and is a neighbor, whereas <code>filltoborder</code>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3323	changes the matte value of any neighbor pixel that is not the border color (<a
				3324	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]	3325	matte value of all pixels.</p>
				3326
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3327	<p>You can set the primitive color, font, and font bounding box color with <a
				3328	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]	3329	respectively. Options are processed in command line order so be sure to use
				3330	these options <var>before</var> the <a href="command-line-options.html#draw">-draw</a> option.</p>
				3331
				3332	<p>Strings that begin with a number must be quoted (e.g. use '1.png' rather
				3333	than 1.png).</p>
				3334
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3335	<p>Drawing primitives conform to the <a href="magick-vector-graphics.html" >Magick
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3336	Vector Graphics</a> format.</p>
				3337
				3338
				3339	<div style="margin: auto;">
				3340	<h3 class="magick-header"><a id="duplicate"></a>-duplicate <var>count,indexes</var></h3>
				3341	</div>
				3342
				3343	<p class="magick-description">duplicate an image one or more times.</p>
				3344
				3345	<p>Specify the count and the image to duplicate by its index in the sequence.
				3346	The first image is index 0. Negative indexes are relative to the end of the
				3347	sequence, for example, -1 represents the last image of the sequence. Specify
				3348	a range of images with a dash (e.g. 0-4). Separate indexes with a comma (e.g.
				3349	0,2). Use <code>+duplicate</code> to duplicate the last image in the current
				3350	image sequence.</p>
				3351
				3352	<div style="margin: auto;">
				3353	<h3 class="magick-header"><a id="edge"></a>-edge <var>radius</var></h3>
				3354	</div>
				3355
				3356	<p class="magick-description">detect edges within an image.</p>
				3357
				3358	<div style="margin: auto;">
				3359	<h3 class="magick-header"><a id="emboss"></a>-emboss <var>radius</var></h3>
				3360	</div>
				3361
				3362	<p class="magick-description">emboss an image.</p>
				3363
				3364	<div style="margin: auto;">
				3365	<h3 class="magick-header"><a id="encipher"></a>-encipher <var>filename</var></h3>
				3366	</div>
				3367
				3368	<p class="magick-description">Encipher pixels for later deciphering by <a href="command-line-options.html#decipher">-decipher</a>.</p>
				3369
				3370	<p>Get the passphrase from the file specified by <var>filename</var>.</p>
				3371
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3372	<p>For more information, see the webpage, <a
Cristy	6549abb	2016-11-10 08:25:55 -0500	[diff] [blame]	3373	href="https://www.imagemagick.org/script/cipher.html">ImageMagick: Encipher or
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3374	Decipher an Image</a>.</p>
				3375
				3376
				3377
				3378	<div style="margin: auto;">
				3379	<h3 class="magick-header"><a id="encoding"></a>-encoding <var>type</var></h3>
				3380	</div>
				3381
				3382	<p class="magick-description">specify the text encoding.</p>
				3383
				3384	<p>Choose from</p>
				3385
				3386	<pre>
				3387	AdobeCustom AdobeExpert
				3388	AdobeStandard AppleRoman
				3389	BIG5 GB2312
				3390	Latin 2 None
				3391	SJIScode Symbol
				3392	Unicode Wansung
				3393	</pre>
				3394
				3395	<div style="margin: auto;">
				3396	<h3 class="magick-header"><a id="endian"></a>-endian <var>type</var></h3>
				3397	</div>
				3398
				3399	<p class="magick-description">Specify endianness (<code>MSB</code> or <code>LSB</code>) of the image.</p>
				3400
				3401	<p>To print a complete list of endian types, use the <a href="command-line-options.html#list">-list endian</a> option.</p>
				3402
				3403	<p>Use <a href="command-line-options.html#endian">+endian</a> to revert to unspecified endianness.</p>
				3404
				3405
				3406	<div style="margin: auto;">
				3407	<h3 class="magick-header"><a id="enhance"></a>-enhance</h3>
				3408	</div>
				3409
				3410	<p class="magick-description">Apply a digital filter to enhance a noisy image.</p>
				3411
				3412
				3413	<div style="margin: auto;">
				3414	<h3 class="magick-header"><a id="equalize"></a>-equalize</h3>
				3415	</div>
				3416
				3417	<p class="magick-description">perform histogram equalization on the image channel-by-channel.</p>
				3418
				3419	<p>To perform histogram equalization on all channels in concert, transform the
				3420	image into some other color space, such as HSL, OHTA, YIQ or YUV, then
				3421	equalize the appropriate intensity-like channel, then convert back to RGB.</p>
				3422
				3423	<p>For example using HSL, we have: ... <code>-colorspace HSL -channel lightness
				3424	-equalize -colorspace RGB</code> ...</p>
				3425
				3426	<p>For YIQ, YUV and OHTA use the red channel. For example, OHTA is a principal
				3427	components transformation that puts most of the information in the first
				3428	channel. Here we have ... <code>-colorspace OHTA -channel red -equalize
				3429	-colorspace RGB</code> ...</p>
				3430
				3431	<div style="margin: auto;">
				3432	<h3 class="magick-header"><a id="evaluate"></a>-evaluate <var>operator value</var></h3>
				3433	</div>
				3434
				3435	<p class="magick-description">Alter channel pixels by evaluating an arithmetic, relational, or logical expression.</p>
				3436
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3437	<p>(See the <a href="command-line-options.html#function" >-function</a> operator for some
				3438	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]	3439	elaborate calculations are needed.)</p>
				3440
				3441	<p>The behaviors of each <var>operator</var> are summarized in the
				3442	following list. For brevity, the numerical value of a "pixel" referred to
				3443	below is the value of the corresponding channel of that pixel, while
				3444	a "normalized pixel" is that number divided by the maximum
				3445	(installation-dependent) value <var>QuantumRange</var>. (If
				3446	normalized pixels are used, they are restored, following the other
				3447	calculations, to the full range by multiplying by <var>QuantumRange</var>.)</p>
				3448
				3449	<table class="table table-condensed table-striped">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3450	<col width="25%" />
				3451	<col width="75%" />
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3452	<thead>
				3453	<tr>
				3454	<th><var>operator</var></th>
				3455	<th>Summary (see further below for details)</th>
				3456	</tr>
				3457	</thead>
				3458	<tbody>
				3459
				3460	<tr><td>Abs </td> <td>Add <var>value</var> to pixels and return absolute value. </td></tr>
				3461	<tr><td>Add </td> <td>Add <var>value</var> to pixels. </td></tr>
				3462	<tr><td>AddModulus </td> <td>Add <var>value</var> to pixels modulo <var>QuantumRange</var>.</td></tr>
				3463	<tr><td>And </td> <td>Binary AND of pixels with <var>value</var>.</td></tr>
				3464	<tr><td>Cos, Cosine </td> <td>Apply cosine to pixels with frequency <var>value</var> with 50% bias added.</td></tr>
				3465	<tr><td>Divide </td> <td>Divide pixels by <var>value</var>.</td></tr>
				3466	<tr><td>Exp </td> <td>base-e exponential function</td></tr>
				3467	<tr><td>Exponential </td> <td>base-e exponential function</td></tr>
				3468	<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>
				3469	<tr><td>Log </td> <td>Apply scaled logarithm to normalized pixels.</td></tr>
				3470	<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>
				3471	<tr><td>Mean </td> <td>Add the <var>value</var> and divide by 2.</td></tr>
				3472	<tr><td>Median </td> <td>Choose the median value from an image sequence.</td></tr>
				3473	<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>
				3474	<tr><td>Multiply </td> <td>Multiply pixels by <var>value</var>.</td></tr>
				3475	<tr><td>Or </td> <td>Binary OR of pixels with <var>value</var>.</td></tr>
				3476	<tr><td>Pow </td> <td>Raise normalized pixels to the power <var>value</var>.</td></tr>
				3477	<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>
				3478	<tr><td>RMS</td> <td>Square the pixel and add the <var>value</var>.</td></tr>
				3479	<tr><td>RootMeanSquare</td> <td>Square the pixel and add the <var>value</var>.</td></tr>
				3480	<tr><td>Set </td> <td>Set pixel equal to <var>value</var>.</td></tr>
				3481	<tr><td>Sin, Sine </td> <td>Apply sine to pixels with frequency <var>value</var> with 50% bias added.</td></tr>
				3482	<tr><td>Subtract </td> <td>Subtract <var>value</var> from pixels.</td></tr>
				3483	<tr><td>Xor </td> <td>Binary XOR of pixels with <var>value.</var></td></tr>
				3484
				3485	<tr><td> </td><td> </td></tr>
				3486
				3487	<tr><td>Gaussian-noise</td><td> </td></tr>
				3488	<tr><td>Impulse-noise</td><td> </td></tr>
				3489	<tr><td>Laplacian-noise</td><td> </td></tr>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3490	<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]	3491	<tr><td>PoissonNoise</td><td> </td></tr>
				3492	<tr><td>Uniform-noise</td><td> </td></tr>
				3493
				3494	<tr><td> </td><td> </td></tr>
				3495
				3496	<tr><td>Threshold </td> <td>Threshold pixels larger than <var>value</var>.</td></tr>
				3497	<tr><td>ThresholdBlack </td> <td>Threshold pixels to zero values equal to or below <var>value</var>.</td></tr>
				3498	<tr><td>ThresholdWhite </td> <td>Threshold pixels to maximum values above <var>value</var>. </td></tr>
				3499	</tbody>
				3500	</table>
				3501
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3502	<p>The specified functions are applied only to each previously set <a
				3503	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]	3504	calculations are truncated (clipped) to fit in the interval [0, <var>QuantumRange</var>]. The transparency channel of the image is
				3505	represented as a 'alpha' values (0 = fully transparent), so, for example, a
				3506	<code>Divide</code> by 2 of the alpha channel will make the image
				3507	semi-transparent. Append the percent symbol '<code>%</code>' to specify a value
				3508	as a percentage of the <var>QuantumRange</var>.</p>
				3509
				3510	<p>To print a complete list of <a href="command-line-options.html#evaluate">-evaluate</a> operators, use
				3511	<a href="command-line-options.html#list">-list evaluate</a>.</p>
				3512
				3513	<p>The results of the <code>Add</code>, <code>Subtract</code> and
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3514	<code>Multiply</code> methods can also be achieved using either the <a
				3515	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]	3516	appropriate argument, to linearly modify the overall range of color values.
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3517	Please note, however, that <a href="command-line-options.html#level" >-level</a> treats transparency as
				3518	'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]	3519	'alpha' values.</p>
				3520
				3521	<p><code>AddModulus</code> has been added as of ImageMagick 6.4.8-4 and provides
				3522	addition modulo the <var>QuantumRange</var>. It is therefore
				3523	equivalent to <code>Add</code> unless the resulting pixel value is outside the
				3524	interval [0, <var>QuantumRange</var>]. </p>
				3525
				3526	<p><code>Exp or Exponential</code> has been added as of ImageMagick 6.6.5-1 and
				3527	works on normalized pixel values. The <var>value</var> used with
				3528	<code>Exp</code> should be negative so as to produce a decaying exponential
				3529	function. Non-negative values will always produce results larger unity and
				3530	thus outside the interval [0, <var>QuantumRange</var>]. The
				3531	formula is expressed below. </p>
				3532
				3533	<p class="text-center">
				3534	exp(<var>value</var> × <b><var>u</var></b>)
				3535	</p>
				3536
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3537	<p> If the input image is squared, for example, using <a href="command-line-options.html#-function"
				3538	>-function polynomial "2 0 0"</a>, then a decaying Gaussian function will be
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3539	the result.</p>
				3540
				3541	<p><code>Log</code> has been added as of ImageMagick 6.4.2-1 and works on
				3542	normalized pixel values. This a <var>scaled</var> log function. The <var>value</var> used with <code>Log</code> provides a <var>scaling
				3543	factor</var> that adjusts the curvature in the graph of the log function. The
				3544	formula applied to a normalized value <b><var>u</var></b> is below. </p>
				3545
				3546	<p class="text-center">
				3547	log(<var>value</var> × <b><var>u</var></b> + 1) / log(<var>value</var> + 1)
				3548	</p>
				3549
				3550	<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]	3551	normalized pixel values. Note that <code>Pow</code> is related to the <a
				3552	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]	3553	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]	3554	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]	3555	with <code>Pow</code>.</p>
				3556
				3557	<p><code>Cosine</code> and <code>Sine</code> was added as of IM v6.4.8-8 and
				3558	converts the image values into a value according to a (co)sine wave function.
				3559	The synonyms <code>Cos</code> and <code>Sin</code> may also be used. The output
				3560	is biased 50% and normalized by 50% so as to fit in the respective color value
				3561	range. The <var>value</var> scaling of the <var>period</var> of the
				3562	function (its frequency), and thus determines the number of 'waves' that will
				3563	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,
				3564	then the effective period is the <var>half</var> the <var>QuantumRange</var>.</p>
				3565
				3566	<p class="text-center">
				3567	0.5 + 0.5 × cos(2 π <b><var>u</var></b> × <var>value</var>).
				3568	</p>
				3569
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3570	<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]	3571	multi-value version of evaluate. </p>
				3572
				3573	<div style="margin: auto;">
				3574	<h3 class="magick-header"><a id="evaluate-sequence"></a>-evaluate-sequence <var>operator</var></h3>
				3575	</div>
				3576
				3577	<p class="magick-description">Alter channel pixels by evaluating an arithmetic, relational, or
				3578	logical expression over a sequence of images.</p>
				3579
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3580	<p>To print a complete list of <a
				3581	href="command-line-options.html#evaluate-sequence">-evaluate-sequence</a> operators, use <a
				3582	href="command-line-options.html#list">-list evaluate</a>.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3583
				3584	<div style="margin: auto;">
				3585	<h3 class="magick-header"><a id="extent"></a>-extent <var>geometry</var></h3>
				3586	</div>
				3587
				3588	<p class="magick-description">Set the image size and offset.</p>
				3589
				3590	<p>If the image is enlarged, unfilled areas are set to the background color.
				3591	To position the image, use offsets in the <var>geometry</var>
				3592	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]	3593	specify how to compose the image with the background, use <a href="command-line-options.html#compose"
				3594	>-compose</a>.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3595
				3596	<p>This command reduces or expands a JPEG image to fit on an 800x600
				3597	display. If the aspect ratio of the input image isn't exactly 4:3, then the
				3598	image is centered on an 800x600 black canvas: </p>
				3599
				3600	<pre>
				3601	convert input.jpg -resize 800x600 -background black -compose Copy \
				3602	-gravity center -extent 800x600 -quality 92 output.jpg
				3603	</pre>
				3604
				3605	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				3606
				3607	<div style="margin: auto;">
				3608	<h3 class="magick-header"><a id="extract"></a>-extract <var>geometry</var></h3>
				3609	</div>
				3610
				3611	<p class="magick-description">Extract the specified area from image.</p>
				3612
				3613	<p>This option is most useful for extracting a subregion of a very large raw
				3614	image. Note that these two commands are equivalent:</p>
				3615
				3616	<pre>
				3617	convert -size 16000x16000 -depth 8 -extract 640x480+1280+960 \
				3618	image.rgb image.png",
				3619	convert -size 16000x16000 -depth 8 'image.rgb[640x480+1280+960]' \
				3620	image.rgb image.png"
				3621	</pre>
				3622
				3623	<p>If you omit the offsets, as in</p>
				3624
				3625	<pre>
				3626	convert -size 16000x16000 -depth 8 -extract 640x480 \
				3627	image.rgb image.png
				3628	</pre>
				3629
				3630	<p>the image is <var>resized</var> to the specified dimensions instead,
				3631	equivalent to:</p>
				3632
				3633	<pre>
				3634	convert -size 16000x16000 -depth 8 -resize 640x480 image.rgb image.png
				3635	</pre>
				3636
				3637	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				3638
				3639	<div style="margin: auto;">
				3640	<h3 class="magick-header"><a id="family"></a>-family <var>fontFamily</var></h3>
				3641	</div>
				3642
				3643	<p class="magick-description">Set a font family for text.</p>
				3644
				3645	<p>This setting suggests a font family that ImageMagick should try to use for
				3646	rendering text. If the family can be found it is used; if not, a default font
				3647	(e.g., "Arial") or a family known to be similar is substituted (e.g.,
				3648	"Courier" might be used if "System" is requested but not found). </p>
				3649
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3650	<p>For other settings that affect fonts, see the options <a
				3651	href="command-line-options.html#font">-font</a>, <a href="command-line-options.html#stretch">-stretch</a>, <a
				3652	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]	3653
				3654	<div style="margin: auto;">
				3655	<h3 class="magick-header"><a id="features"></a>-features <var>distance</var></h3>
				3656	</div>
				3657
				3658	<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>
				3659
				3660	<pre>
				3661	Angular Second Moment Sum Entropy
				3662	Contrast Entropy
				3663	Correlation Difference Variance
				3664	Sum of Squares Variance Difference Entropy
				3665	Inverse Difference Moment Information Measure of Correlation 1
				3666	Sum Average Information Measure of Correlation 2
				3667	Sum Variance Maximum Correlation Coefficient
				3668	</pre>
				3669
				3670	<div style="margin: auto;">
				3671	<h3 class="magick-header"><a id="fft"></a>-fft</h3>
				3672	</div>
				3673
				3674	<p class="magick-description">implements the forward discrete Fourier transform (DFT).</p>
				3675
				3676	<p>This option is new as of ImageMagick 6.5.4-3 (and now working for Windows
				3677	users in ImageMagick 6.6.0-9). It transforms an image from the normal
				3678	(spatial) domain to the frequency domain. In the frequency domain, an image is
				3679	represented as a superposition of complex sinusoidal waves of varying
				3680	amplitudes. The image x and y coordinates are the possible frequencies along
				3681	the x and y directions, respectively, and the pixel intensity values are
				3682	complex numbers that correspond to the sinusoidal wave amplitudes. See for
				3683	example, <a href="http://en.wikipedia.org/wiki/Fourier_transform">Fourier
				3684	Transform</a>, <a href="http://en.wikipedia.org/wiki/DFT">Discrete Fourier
				3685	Transform</a> and <a href="http://en.wikipedia.org/wiki/FFT">Fast Fourier
				3686	Transform</a>.</p>
				3687
				3688	<p>A single image name is provided as output for this option. However, the
				3689	output result will have two components. It is either a two-frame image or two
				3690	separate images, depending upon whether the image format specified supports
				3691	multi-frame images. The reason that we get a dual output result is because the
				3692	frequency domain represents an image using complex numbers, which cannot be
				3693	visualized directly. Therefore, the complex values are automagically separated
				3694	into a two-component image representation. The first component is the
				3695	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]	3696	number. See for example, <a
				3697	href="http://en.wikipedia.org/wiki/Complex_numbers">Complex Numbers</a>.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3698
				3699	<p>The magnitude and phase component images must be specified using image
				3700	formats that do not limit the color or compress the image. Thus, MIFF, TIF,
				3701	PFM, EXR and PNG are the recommended image formats to use. All of these
				3702	formats, except PNG support multi-frame images. So for example,</p>
				3703
				3704	<pre>
				3705	convert image.png -fft fft_image.miff
				3706	</pre>
				3707
				3708	<p>generates a magnitude image as <code>fft_image.miff[0]</code> and a phase
				3709	image as <code>fft_image.miff[1]</code>. Similarly,</p>
				3710
				3711	<pre>
				3712	convert image.png -fft fft_image.png
				3713	</pre>
				3714
				3715	<p>generates a magnitude image as <code>fft_image-0.png</code> and a phase image
				3716	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]	3717	force any of the other formats to produce two output images by including <a
				3718	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]	3719
				3720	<p>The input image can be any size, but if not square and even-dimensioned, it
				3721	is padded automagically to the larger of the width or height of the input
				3722	image and to an even number of pixels. The padding will occur at the bottom
				3723	and/or right sides of the input image. The resulting output magnitude and
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3724	phase images is square at this size. The kind of padding relies on the <a
				3725	href="command-line-options.html#virtual-pixel">-virtual-pixel</a> setting.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3726
				3727	<p>Both output components will have dynamic ranges that fit within
				3728	[0, <var>QuantumRange</var>], so that HDRI need not be enabled.
				3729	Phase values nominally range from 0 to 2*π, but is scaled to span the full
				3730	dynamic range. (The first few releases had non-HDRI scaled but HDRI not
				3731	scaled). The magnitude image is not scaled and thus generally will contain
				3732	very small values. As such, the image normally will appear totally black. In
				3733	order to view any detail, the magnitude image typically is enhanced with a log
				3734	function into what is usually called the spectrum. A log function is used to
				3735	enhance the darker values more in comparison to the lighter values. This can
				3736	be done, for example, as follows:</p>
				3737
				3738	<pre>
				3739	convert fft_image.miff[0] -contrast-stretch 0 \
				3740	-evaluate log 1000 fft_image_spectrum.png"
				3741	</pre>
				3742
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3743	<p>where either <a href="command-line-options.html#contrast-stretch">-contrast-stretch</a> 0 or <a
				3744	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]	3745	range, first. The argument to the <a href="command-line-options.html#evaluate">-evaluate</a> log
				3746	typically is specified between 100 and 10,000, depending upon the amount of
				3747	detail that one wants to bring out in the spectrum. Larger values produce more
				3748	visible detail. Too much detail, however, may hide the important features.</p>
				3749
				3750	<p>The <a href="http://www.fftw.org/">FFTW</a> delegate library is required to
				3751	use <a href="command-line-options.html#fft">-fft</a>.</p>
				3752
				3753	<p>Use <a href="command-line-options.html#fft">+fft</a> to produce two output images that are the real
				3754	and imaginary components of the complex valued Fourier transform.</p>
				3755
				3756	<p>However, as the real and imaginary components can contain negative values,
				3757	this requires that IM be configured with HDRI enabled. In this case, you must
				3758	use either MIFF, TIF, PFM or MPC formats for the real and imaginary component
				3759	results, since they are formats that preserve both negative and fractional
				3760	values without clipping them or truncating the fractional part. With either
				3761	MIFF or TIF, one should add -define quantum:format=32, to allow those image
				3762	types to work properly in HDRI mode without clipping.</p>
				3763
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3764	<p>The real and imaginary component images resulting from <a
				3765	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]	3766	padding that was discussed above for the magnitude and phase component
				3767	images.</p>
				3768
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3769	<p>See the discussion on HDRI implementations of ImageMagick on the page <a
				3770	href="high-dynamic-range.html" >High Dynamic-Range Images</a>. For more
				3771	about HDRI go the ImageMagick <a
Cristy	364a72f	2016-11-04 22:38:41 -0400	[diff] [blame]	3772	href="https://www.imagemagick.org/Usage/basics/#hdri" >Usage</a> pages, <a
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3773	href="http://www.fmwconcepts.com/imagemagick/fourier_transforms/fourier.html"
				3774	>Fred's Fourier Processing With ImageMagick page</a> or this <a
				3775	href="http://en.wikipedia.org/wiki/High_dynamic_range_imaging" >Wikipedia</a>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3776	entry. </p>
				3777
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3778	<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]	3779
				3780
				3781	<div style="margin: auto;">
				3782	<h3 class="magick-header"><a id="fill"></a>-fill <var>color</var></h3>
				3783	</div>
				3784
				3785	<p class="magick-description">color to use when filling a graphic primitive.</p>
				3786
				3787	<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]	3788	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]	3789	a description of how to properly specify the color argument.</p>
				3790
				3791	<p>Enclose the color specification in quotation marks to prevent the "#" or
				3792	the parentheses from being interpreted by your shell.</p>
				3793
				3794	<p>For example,</p>
				3795
				3796	<pre>
				3797	-fill blue
				3798	-fill "#ddddff"
				3799	-fill "rgb(255,255,255)"
				3800	</pre>
				3801
				3802	<p>See <a href="command-line-options.html#draw">-draw</a> for further details.</p>
				3803
				3804	<p>To print a complete list of color names, use the <a href="command-line-options.html#list">-list color</a> option.</p>
				3805
				3806	<div style="margin: auto;">
				3807	<h3 class="magick-header"><a id="filter"></a>-filter <var>type</var></h3>
				3808	</div>
				3809
				3810	<p class="magick-description">Use this <var>type</var> of filter when resizing or distorting an image.</p>
				3811
				3812	<p>Use this option to affect the resizing operation of an image during
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3813	operations such as <a href="command-line-options.html#resize">-resize</a> and <a href="command-line-options.html#distort"
				3814	>-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]	3815
				3816	<pre>
				3817	Point Hermite Cubic
				3818	Box Gaussian Catrom
				3819	Triangle Quadratic Mitchell
				3820	</pre>
				3821
				3822	<p>The <code>Bessel</code> and <code>Sinc</code> filter is also provided (as well
				3823	as a faster <code>SincFast</code> equivalent form). However these filters are
				3824	generally useless on their own as they are infinite filters that are being
				3825	clipped to the filters support size. Their direct use is not recommended
				3826	except via expert settings (see below). </p>
				3827
				3828	<p>Instead these special filter functions are typically windowed by a windowing
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3829	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]	3830	using these functions will define a 'Windowed' filter, appropriate to the
				3831	operator involved. Windowed filters include: </p>
				3832
				3833	<pre>
				3834	Lanczos Hamming Parzen
				3835	Blackman Kaiser Welsh
				3836	Hanning Bartlett Bohman
				3837	</pre>
				3838
				3839	<p>Also one special self-windowing filter is also provided
				3840	<code>Lagrange</code>, which will automagically re-adjust its function depending
				3841	on the current 'support' or 'lobes' expert settings (see below).</p>
				3842
				3843	<p>If you do not select a filter with this option, the filter defaults to
				3844	<code>Mitchell</code> for a colormapped image, an image with a matte channel, or
				3845	if the image is enlarged. Otherwise the filter default to
				3846	<code>Lanczos</code>.</p>
				3847
				3848	<p>To print a complete list of resize filters, use the <a href="command-line-options.html#list">-list
				3849	filter</a> option.</p>
				3850
				3851	<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]	3852	use of these expert settings (see also <a href="command-line-options.html#define" >-define</a> and <a
				3853	href="command-line-options.html#set" >-set</a>):-</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3854
				3855	<table class="table table-condensed table-striped">
				3856	<tr>
				3857	<td>-define filter:blur=<var>factor</var></td>
				3858	<td>Scale the X axis of the filter (and its window). Use > 1.0 for
				3859	blurry or < 1.0 for sharp. This should only be used with Gaussian and
				3860	Gaussian-like filters simple filters, or you may not get the expected
				3861	results. </td>
				3862	</tr>
				3863
				3864	<tr>
				3865	<td>-define filter:support=<var>radius</var></td>
				3866	<td>Set the filter support radius. Defines how large the filter should be and
				3867	thus directly defines how slow the filtered resampling process is. All
				3868	filters have a default 'preferred' support size. Some filters like
				3869	<code>Lagrange</code> and windowed filters adjust themselves depending on
				3870	this value. With simple filters this value either does nothing (but slow
				3871	the resampling), or will clip the filter function in a detrimental way.
				3872	</td>
				3873	</tr>
				3874
				3875	<tr>
				3876	<td>-define filter:lobes=<var>count</var></td>
				3877	<td>Set the number of lobes to use for the Sinc/Bessel filter. This an
				3878	alternative way of specifying the 'support' range of the filter, that is
				3879	designed to be more suited to windowed filters, especially when used for
				3880	image distorts.</td>
				3881	</tr>
				3882
				3883	<tr>
				3884	<td>-define filter:sigma=<var>value</var></td>
				3885	<td>The 'sigma' value used to define the <code>Gaussian</code> filter. Default
				3886	sigma value is '<code>0.5</code>'. It only effects <code>Gaussian</code> but
				3887	does not shrink (but may enlarge) the filter's 'support'. It can be used
				3888	to generate very small blurs but without the filter 'missing' pixels due
				3889	to using a small support setting. A larger value of '<code>0.707</code>'
				3890	(a value of '1/sqrt(2)') is another common setting. </td>
				3891	</tr>
				3892
				3893	<tr>
				3894	<td>-define filter:b=<var>b-spline_factor</var></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3895	<tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3896	<td>-define filter:c=<var>keys_alpha_factor</var></td>
				3897	<td>Redefine the values used for cubic filters such as <code>Cubic</code>,
				3898	<code>Catrom</code>, <code>Mitchel</code>, and <code>Hermite</code>, as well as
				3899	the <code>Parzen</code> cubic windowing function. If only one of the values
				3900	are defined, the other is set so as to generate a 'Cubic-Keys' filter.
				3901	The values meaning was defined by a research paper by
				3902	Mitchell-Netravali.</td>
				3903	</tr>
				3904
				3905	<tr>
				3906	<td>-define filter:kaiser-beta=<var>value</var></td>
				3907	<td>The 'alpha' value used to as part of the Kaiser Windowing function.
				3908	Default value is '6.5'. It only effects Kaiser windowing function, and
				3909	does not effect any other attributes.
				3910	Before ImageMagick v6.7.6-10, this option was known as "filter:alpha", (an
				3911	inheritance from the very old "zoom" program). It was changed to bring the
				3912	function in line with more modern academic research usage, and better
				3913	assign it be more definitive. </td>
				3914	</tr>
				3915
				3916	<tr>
				3917	<td>-define filter:kaiser-alpha=<var>value</var></td>
				3918	<td>This value when multiplied by 'PI' is equivalent to "kaiser-beta", and
				3919	will override that setting. It only effects Kaiser windowing function,
				3920	and does not effect any other attributes. </td>
				3921	</tr>
				3922
				3923	<tr>
				3924	<td>-define filter:filter=<var>filter_function</var></td>
				3925	<td>Use this function directly as the weighting filter. This will allow
				3926	you to directly use a windowing function such as <code>Blackman</code>,
				3927	as a resampling filter, rather than as its normal usage as a windowing
				3928	function. If defined, no windowing function also defined, the window function is set
				3929	to <code>Box</code>). Directly specifying <code>Sinc</code> or <code>Jinc</code>
				3930	as a filter will also do this. </td>
				3931	</tr>
				3932
				3933	<tr>
				3934	<td>-define filter:window=<var>filter_function</var></td>
				3935	<td>The IIR (infinite impulse response) filters <code>Sinc</code> and
				3936	<code>Jinc</code> are windowed (brought down to zero over the defined
				3937	support range) with the given filter. This allows you to specify a filter
				3938	function to be used as a windowing function for these IIR filters.
				3939	Many of the defined filters are actually windowing functions for these IIR
				3940	filters. A typical choices is <code>Box</code>, (which effectively turns
				3941	off the windowing function). </td>
				3942	</tr>
				3943
				3944	<tr>
				3945	<td>-define filter:win-support=<var>radius</var></td>
				3946	<td>Scale windowing function to this size instead. This causes the windowing
				3947	(or self-windowing Lagrange filter) to act is if the support window is
				3948	larger than what is actually supplied to the calling operator. The filter
				3949	however is still clipped to the real support size given. If unset this
				3950	will equal the normal filter support size. </td>
				3951	</tr>
				3952
				3953	<tr>
				3954	<td>-define filter:verbose=<var>1</var></td>
				3955	<td>This causes IM to print information on the final internal filter
				3956	selection to standard output. This includes a commented header on the
				3957	filter settings being used, and data allowing the filter weights to be
				3958	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
				3959	a <code>SincFast</code> windowed <code>SincFast</code> filter, while
				3960	<code>Mitchell</code> is defined as a general <code>Cubic</code> family filter
				3961	with specific 'B' and 'C' settings. </td>
				3962	</tr>
				3963
				3964	</table>
				3965
				3966	<p>For example, to get a 8 lobe jinc windowed sinc filter (Genseng filter?):</p>
				3967
				3968	<pre>
				3969	convert image.png \
				3970	-filter sinc \
				3971	-set filter:window=jinc \
				3972	-set filter:lobes=8 \
				3973	-resize 150% image.jpg"
				3974	</pre>
				3975
				3976	<p>Or a raw un-windowed Sinc filter with 4 lobes:</p>
				3977
				3978	<pre>
				3979	convert image.png \
				3980	-set filter:filter=sinc \
				3981	-set filter:lobes=4 \
				3982	-resize 150% image.jpg"
				3983	</pre>
				3984
				3985	<p>To extract the data for a raw windowing function, combine it with
				3986	a '<code>Box</code>' filter. For example the '<code>Welch</code> parabolic
				3987	windowing function. </p>
				3988
				3989	<pre>
				3990	convert null: -define filter:filter=Box \
				3991	-define filter:window=Welch \
				3992	-define filter:support=1.0 \
				3993	-define filter:verbose=1 \
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	3994	-resize 2 null: > window_welch.dat
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	3995	gnuplot
				3996	set grid
				3997	plot \"window_welch.dat\" with lines
				3998	</pre>
				3999
				4000	<p>Note that the use of expert options is provided for image processing experts
				4001	who have studied and understand how resize filters work. Without this
				4002	knowledge, and an understanding of the definition of the actual filters
				4003	involved, using expert settings are more likely to be detrimental to your image
				4004	resizing.</p>
				4005
				4006
				4007	<div style="margin: auto;">
				4008	<h3 class="magick-header"><a id="flatten"></a>-flatten</h3>
				4009	</div>
				4010
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4011	<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]	4012
				4013
				4014	<div style="margin: auto;">
				4015	<h3 class="magick-header"><a id="flip"></a>-flip</h3>
				4016	</div>
				4017
				4018	<p class="magick-description">create a <var>mirror image</var></p>
				4019
				4020	<p>reflect the scanlines in the vertical direction. The image will be mirrored
				4021	upside-down. </p>
				4022
				4023
				4024	<div style="margin: auto;">
				4025	<h3 class="magick-header"><a id="floodfill"></a>-floodfill {<var>+-</var>}<var>x</var>{<var>+-</var>}<var>y</var> <var>color</var></h3>
				4026	</div>
				4027
				4028	<p class="magick-description">floodfill the image with color at the specified offset.</p>
				4029
				4030	<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]	4031	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]	4032	given <var>color</var> argument, connected to that 'seed point'
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4033	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]	4034
				4035	<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]	4036	<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]	4037	action will be taken. </p>
				4038
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4039	<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]	4040	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]	4041	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]	4042	its 'color floodfill' drawing method. </p>
				4043
				4044
				4045	<div style="margin: auto;">
				4046	<h3 class="magick-header"><a id="flop"></a>-flop</h3>
				4047	</div>
				4048
				4049	<p class="magick-description">create a <var>mirror image</var>.</p>
				4050
				4051	<p>Reflect the scanlines in the horizontal direction, just like the image in
				4052	a vertical mirror. </p>
				4053
				4054
				4055	<div style="margin: auto;">
				4056	<h3 class="magick-header"><a id="font"></a>-font <var>name</var></h3>
				4057	</div>
				4058
				4059	<p class="magick-description">set the font to use when annotating images with text, or creating labels.</p>
				4060
				4061	<p>To print a complete list of fonts, use the <a href="command-line-options.html#list">-list font</a>
				4062	option (for versions prior to 6.3.6, use 'type' instead of 'font').</p>
				4063
				4064	<p>In addition to the fonts specified by the above pre-defined list, you can
				4065	also specify a font from a specific source. For example <code>Arial.ttf</code>
				4066	is a TrueType font file, <code>ps:helvetica</code> is PostScript font, and
				4067	<code>x:fixed</code> is X11 font.</p>
				4068
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4069	<p>For other settings that affect fonts, see the options <a
				4070	href="command-line-options.html#family">-family</a>, <a href="command-line-options.html#stretch">-stretch</a>, <a
				4071	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]	4072
				4073
				4074	<div style="margin: auto;">
				4075	<h3 class="magick-header"><a id="foreground"></a>-foreground <var>color</var></h3>
				4076	</div>
				4077
				4078	<p class="magick-description">Define the foreground color for menus.", "display</p>
				4079
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4080	<p>The color is specified using the format described under the <a
				4081	href="command-line-options.html#fill">-fill</a> option.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4082
				4083	<p>The default foreground color is black.</p>
				4084
				4085	<div style="margin: auto;">
				4086	<h3 class="magick-header"><a id="format"></a>-format <var>type</var></h3>
				4087	</div>
				4088
				4089	<p class="magick-description">the image format type.</p>
				4090
				4091	<p>When used with the <code>mogrify</code> utility, this option converts any
				4092	image to the image <a href="formats.html">format</a> you specify.
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4093	For a list of image format types supported by ImageMagick, use <a
				4094	href="command-line-options.html#list">-list format</a>.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4095
				4096	<p>By default the file is written to its original name. However, if the
				4097	filename extension matches a supported format, the extension is replaced with
				4098	the image format type specified with <a href="command-line-options.html#format">-format</a>. For
				4099	example, if you specify <var>tiff</var> as the format type and the
				4100	input image filename is <var>image.gif</var>, the output image
				4101	filename becomes <var>image.tiff</var>.</p>
				4102
				4103	<div style="margin: auto;">
				4104	<h3 class="magick-header"><a id="format_identify_"></a>-format <var>string</var></h3>
				4105	</div>
				4106
				4107	<p class="magick-description">output formatted image characteristics.</p>
				4108
				4109	<p>See <a href="escape.html">Format and Print Image
				4110	Properties</a> for an explanation on how to specify the argument to this
				4111	option.</p>
				4112
				4113	<div style="margin: auto;">
				4114	<h3 class="magick-header"><a id="frame"></a>-frame <var>geometry</var></h3>
				4115	</div>
				4116
				4117	<p class="magick-description">Surround the image with a border or beveled frame.</p>
				4118
Cristy	f650f4f	2016-04-01 10:53:07 -0400	[diff] [blame]	4119	<p>The color of the border is specified with the <a href="command-line-options.html#alpha-color"
				4120	>-alpha-color</a> command line option. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4121
				4122	<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
				4123	height that is added to the dimensions of the image. If no offsets are given
				4124	in the <var>geometry</var> argument, then the border added is
				4125	a solid color. Offsets <var>x</var> and <var>y</var>, if present, specify that
				4126	the width and height of the border is partitioned to form an outer bevel of
				4127	thickness <var>x</var> pixels and an inner bevel of thickness
				4128	<var>y</var> pixels. Negative offsets make no sense as frame arguments.
				4129	</p>
				4130
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4131	<p>The <a href="command-line-options.html#frame">-frame</a> option is affected by the current <a
				4132	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]	4133	'<code>Over</code>' composition method. It generates an image of the appropriate
				4134	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]	4135	draws the frame of four distinct colors close to the current <a
Cristy	f650f4f	2016-04-01 10:53:07 -0400	[diff] [blame]	4136	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]	4137	center of this image. This means that with the default compose method of
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4138	'<code>Over</code>' any transparent parts may be replaced by the current <a
				4139	href="command-line-options.html#bordercolor">-bordercolor</a> setting.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4140
				4141	<p>The image composition is not
				4142	affected by the <a href="command-line-options.html#gravity">-gravity</a> option.</p>
				4143
				4144
				4145	<div style="margin: auto;">
				4146	<h3 class="magick-header"><a id="frame_import_"></a>-frame</h3>
				4147	</div>
				4148
				4149	<p class="magick-description">include the X window frame in the imported image. </p>
				4150	<div style="margin: auto;">
				4151	<h3 class="magick-header"><a id="function"></a>-function <var>function</var> <var>parameters</var></h3>
				4152	</div>
				4153
				4154	<p class="magick-description">Apply a function to channel values.</p>
				4155
				4156	<p>This operator performs calculations based on the given arguments to modify
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4157	each of the color values for each previously set <a
				4158	href="command-line-options.html#channel">-channel</a> in the image. See <a
				4159	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]	4160	calculations are handled.</p>
				4161
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4162	<p>This is can be considered a multi-argument version of the <a
				4163	href="command-line-options.html#evaluate">-evaluate</a> operator. (Added in
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4164	ImageMagick 6.4.8−8.)</p>
				4165
				4166	<p>Here, <var>parameters</var> is a comma-separated list of
				4167	numerical values. The number of values varies depending on which <var>function</var> is selected. Choose the <var>function</var> from:</p>
				4168
				4169	<pre>
				4170	Polynomial
				4171	Sinusoid
				4172	Arcsin
				4173	Arctan
				4174	</pre>
				4175
				4176	<p>To print a complete list of <a href="command-line-options.html#function">-function</a> operators,
				4177	use <a href="command-line-options.html#list">-list function</a>. Descriptions follow.</p>
				4178
				4179	<dl class="dl-horizontal">
				4180	<dt>Polynomial</dt>
				4181	<dd><p>The <code>Polynomial</code> function takes an arbitrary number of parameters,
				4182	these being the coefficients of a polynomial, in decreasing order of degree.
				4183	That is, entering</p>
				4184
				4185	<pre>
				4186	-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>
				4187	</pre>
				4188
				4189	<p>will invoke a polynomial function given by</p>
				4190
				4191	<pre>
				4192	<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>,
				4193	</pre>
				4194
				4195	<p>where <b><var>u</var></b> is pixel's original normalized channel value.</p>
				4196
				4197	<p>The <code>Polynomial</code> function can be used in place of <code>Set</code>
				4198	(the <var>constant</var> polynomial) and <code>Add</code>, <code>Divide</code>,
				4199	<code>Multiply</code>, and <code>Subtract</code> (some <var>linear</var>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4200	polynomials) of the <a href="command-line-options.html#evaluate">-evaluate</a> operator. The <a
				4201	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]	4202	correspondences follow.</p>
				4203
				4204	<table class="table table-condensed table-striped">
				4205	<tr>
				4206	<td>-evaluate Set <var>value</var> </td>
				4207	<td>-function Polynomial <var>value</var></td>
				4208	<td>(Constant functions; set <var>value</var>×100% gray when channels are RGB.)</td>
				4209	</tr>
				4210	<tr>
				4211	<td>-evaluate Add <var>value</var> </td>
				4212	<td>-function Polynomial 1,<var>value</var></td>
				4213	</tr>
				4214	<tr>
				4215	<td>-evaluate Subtract <var>value</var> </td>
				4216	<td>-function Polynomial 1,−<var>value</var></td>
				4217	</tr>
				4218	<tr>
				4219	<td>-evaluate Multiply <var>value</var> </td>
				4220	<td>-function Polynomial <var>value</var>,0</td>
				4221	</tr>
				4222	<tr>
				4223	<td>+level black% x white%</td>
				4224	<td>-function Polynomial A,B</td>
				4225	<td>(Reduce contrast. Here, A=(white-black)/100 and B=black/100.)</td>
				4226	</tr>
				4227	</table>
				4228
				4229	<p>The <code>Polynomial</code> function gives great versatility, since
				4230	polynomials can be used to fit any continuous curve to any degree of accuracy
				4231	desired.</p>
				4232
				4233	</dd>
				4234	<dt>Sinusoid</dt>
				4235	<dd>
				4236	<p>The <code>Sinusoid</code> function can be used to vary the channel values
				4237	sinusoidally by setting frequency, phase shift, amplitude, and a bias. These
				4238	values are given as one to four parameters, as follows,</p>
				4239
				4240	<pre>
				4241	-function <code>Sinusoid</code> <var>freq</var>,[<var>phase</var>,[<var>amp</var>,[<var>bias</var>]]]
				4242	</pre>
				4243
				4244	<p>where <var>phase</var> is in degrees. (The domain [0,1] of the function
				4245	corresponds to 0 through <var>freq</var>×360 degrees.)
				4246	The result is that if a pixel's normalized channel value is originally
				4247	<b><var>u</var></b>, its resulting normalized value is given by </p>
				4248
				4249	<pre>
				4250	<var>amp</var> * sin(2π (<var>freq</var> * <b><var>u</var></b> + <var>phase</var> / 360)) + <var>bias</var>
				4251	</pre>
				4252
				4253	<p> For example, the following generates a curve that starts and ends at 0.9
				4254	(when <b><var>u</var></b>=0 and 1, resp.), oscillating three times between
				4255	.7−.2=.5 and .7+.2=.9. </p>
				4256
				4257	<pre>
				4258	-function Sinusoid 3,-90,.2,.7
				4259	</pre>
				4260
				4261	<p>The default values of <var>amp</var> and <var>bias</var> are both .5. The default for <var>phase</var>
				4262	is 0.</p>
				4263
				4264	<p>The <code>Sinusoid</code> function generalizes <code>Sin</code> and
				4265	<code>Cos</code> of the <a href="command-line-options.html#evaluate">-evaluate</a> operator by allowing
				4266	varying amplitude, phase and bias. The correspondence is as follows.</p>
				4267
				4268	<table class="table table-condensed table-striped">
				4269	<tr>
				4270	<td>-evaluate Sin <var>freq</var> </td>
				4271	<td>-function Sinusoid <var>freq</var>,0 </td>
				4272	</tr>
				4273	<tr>
				4274	<td>-evaluate Cos <var>freq</var> </td>
				4275	<td>-function Sinusoid <var>freq</var>,90 </td>
				4276	</tr>
				4277	</table>
				4278	</dd>
				4279	<dt>ArcSin</dt>
				4280	<dd>
				4281	<p>The <code>ArcSin</code> function generates the inverse curve of a Sinusoid,
				4282	and can be used to generate cylindrical distortion and displacement maps.
				4283	The curve can be adjusted relative to both the input values and output range
				4284	of values.</p>
				4285
				4286	<pre>
				4287	-function <code>ArcSin</code> <var>width</var>,[<var>center</var>,[<var>range</var>,[<var>bias</var>]]]
				4288	</pre>
				4289
				4290	<p>with all values given in terms of normalized color values (0.0 for black,
				4291	1.0 for white). Defaulting to values covering the full range from 0.0 to 1.0
				4292	for bout input (<var>width</var>), and output (<var>width</var>) values. '<code>1.0,0.5,1.0,0.5</code>' </p>
				4293
				4294	<pre>
				4295	<var>range</var>/π * asin( 2/<var>width</var> * ( <b><var>u</var></b> - <var>center</var> ) ) + <var>bias</var>
				4296	</pre>
				4297
				4298	</dd>
				4299	<dt>ArcTan</dt>
				4300	<dd>
				4301	<p>The <code>ArcTan</code> function generates a curve that smooth crosses from
				4302	limit values at infinities, though a center using the given slope value.
				4303	All these values can be adjusted via the arguments.</p>
				4304
				4305	<pre>
				4306	-function <code>ArcTan</code> <var>slope</var>,[<var>center</var>,[<var>range</var>,[<var>bias</var>]]]
				4307	</pre>
				4308
				4309	<p>Defaulting to '<code>1.0,0.5,1.0,0.5</code>'.
				4310	</p>
				4311
				4312	<pre>
				4313	<var>range</var>/π * atan( <var>slope</var>π ( <b><var>u</var></b> - <var>center</var> ) ) + <var>bias</var>
				4314	</pre>
				4315	</dd>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4316	</tr>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4317	</dl>
				4318
				4319
				4320
				4321	<div style="margin: auto;">
				4322	<h3 class="magick-header"><a id="fuzz"></a>-fuzz <var>distance</var>{<var>%</var>}</h3>
				4323	</div>
				4324
				4325	<p class="magick-description">Colors within this <var>distance</var> are considered equal.</p>
				4326
				4327	<p>A number of algorithms search for a target color. By default the color must
				4328	be exact. Use this option to match colors that are close to the target color
				4329	in RGB space. For example, if you want to automagically trim the edges of an
				4330	image with <a href="command-line-options.html#trim">-trim</a> but the image was scanned and the target
				4331	background color may differ by a small amount. This option can account for
				4332	these differences.</p>
				4333
				4334	<p>The <var>distance</var> can be in absolute intensity units or, by
				4335	appending <code>%</code> as a percentage of the maximum possible intensity (255,
				4336	65535, or 4294967295).</p>
				4337
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4338	<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]	4339
				4340
				4341	<div style="margin: auto;">
				4342	<h3 class="magick-header"><a id="fx"></a>-fx <var>expression</var></h3>
				4343	</div>
				4344
				4345	<p class="magick-description">apply a mathematical expression to an image or image channels.</p>
				4346
				4347	<p>If the first character of <var>expression</var> is <code>@</code>,
				4348	the expression is read from a file titled by the remaining characters in the
				4349	string.</p>
				4350
				4351	<p>See <a href="fx.html">FX,
				4352	The Special Effects Image Operator</a> for a detailed discussion of this
				4353	option.</p>
				4354
				4355
				4356	<div style="margin: auto;">
				4357	<h3 class="magick-header"><a id="gamma"></a>-gamma <var>value</var></h3>
				4358	</div>
				4359
				4360	<p class="magick-description">level of gamma correction.</p>
				4361
				4362	<p>The same color image displayed on two different workstations may look
				4363	different due to differences in the display monitor. Use gamma correction to
				4364	adjust for this color difference. Reasonable values extend from
				4365	<code>0.8</code> to <code>2.3</code>. Gamma less than 1.0 darkens the image and
				4366	gamma greater than 1.0 lightens it. Large adjustments to image gamma may
				4367	result in the loss of some image information if the pixel quantum size is only
				4368	eight bits (quantum range 0 to 255).</p>
				4369
				4370	<p>Gamma adjusts the image's channel values pixel-by-pixel according to
				4371	a power law, namely, pow(pixel,1/gamma) or pixel^(1/gamma), where pixel is the
				4372	normalized or 0 to 1 color value. For example, using a value of gamma=2 is the
				4373	same as taking the square root of the image.</p>
				4374
				4375	<p>You can apply separate gamma values to the red, green, and blue channels of
				4376	the image with a gamma value list delimited with commas (e.g.,
				4377	<code>1.7,2.3,1.2</code>).</p>
				4378
				4379	<p>Use <a href="command-line-options.html#gamma">+gamma <var>value</var></a> to set the
				4380	image gamma level without actually adjusting the image pixels. This option
				4381	is useful if the image is of a known gamma but not set as an image attribute
				4382	(e.g. PNG images). Write the "file gamma" which is the reciprocal of the
				4383	display gamma; e.g., if your image is sRGB and you want to write a PNG gAMA
				4384	chunk, use</p>
				4385
				4386	<pre>
				4387	convert input.png +gamma .45455 output.png
				4388	</pre>
				4389
				4390	<p>(0.45455 is 1/2.2)</p>
				4391
				4392	<p>Note that gamma adjustments are also available via the <a href="command-line-options.html#level">-level</a> operator.</p>
				4393
				4394	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4395	<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]	4396	</div>
				4397
				4398	<p class="magick-description">Blur the image with a Gaussian operator.</p>
				4399
				4400	<p>Convolve the image with a Gaussian or normal distribution using the given
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4401	<var >Sigma</var> value. The formula is:</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4402
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4403	<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]	4404
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4405	<p>The <var >Sigma</var> value is the important argument, and
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4406	determines the actual amount of blurring that will take place. </p>
				4407
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4408	<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]	4409	array which will hold the calculated Gaussian distribution. It should be an
				4410	integer. If not given, or set to zero, IM will calculate the largest possible
				4411	radius that will provide meaningful results for the Gaussian distribution.
				4412	</p>
				4413
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4414	<p>The larger the <var >Radius</var> the radius the slower the
				4415	operation is. However too small a <var >Radius</var>, and sever
				4416	aliasing effects may result. As a guideline, <var >Radius</var>
				4417	should be at least twice the <var >Sigma</var> value, though three
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4418	times will produce a more accurate result. </p>
				4419
				4420	<p>This differs from the faster <a href="command-line-options.html#blur">-blur</a> operator in that a
				4421	full 2-dimensional convolution is used to generate the weighted average of the
				4422	neighboring pixels. </p>
				4423
				4424	<p>The <a href="command-line-options.html#virtual-pixel">-virtual-pixel</a> setting will determine how
				4425	pixels which are outside the image proper are blurred into the final result.
				4426	</p>
				4427
				4428
				4429	<div style="margin: auto;">
				4430	<h3 class="magick-header"><a id="geometry"></a>-geometry <var>geometry</var></h3>
				4431	</div>
				4432
				4433	<p class="magick-description">Set the preferred size and location of the image.</p>
				4434
				4435	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				4436
				4437	<div style="margin: auto;">
				4438	<h3 class="magick-header"><a id="gravity"></a>-gravity <var>type</var></h3>
				4439	</div>
				4440
				4441	<p class="magick-description">Sets the current gravity suggestion for various other settings and options.</p>
				4442
				4443	<p>Choices include: <code>NorthWest</code>, <code>North</code>,
				4444	<code>NorthEast</code>, <code>West</code>, <code>Center</code>, <code>East</code>,
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4445	<code>SouthWest</code>, <code>South</code>, <code>SouthEast</code>. Use <a
				4446	href="command-line-options.html#list">-list gravity</a> to get a complete list of <a
				4447	href="command-line-options.html#gravity">-gravity</a> settings available in your ImageMagick
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4448	installation.</p>
				4449
				4450	<p>The direction you choose specifies where to position text or subimages. For
				4451	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]	4452	the image. By default, the image gravity is <code>undefined</code>. See <a
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4453	href="command-line-options.html#draw">-draw</a> for more details about graphic primitives. Only the
				4454	text primitive of <a href="command-line-options.html#draw">-draw</a> is affected by the <a
				4455	href="command-line-options.html#gravity">-gravity</a> option.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4456
				4457	<p>The <a href="command-line-options.html#gravity">-gravity</a> option is also used in concert with the
				4458	<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]	4459	take <var>geometry</var> as an argument, such as the <a
				4460	href="command-line-options.html#crop">-crop</a> option. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4461
				4462	<p>If a <a href="command-line-options.html#gravity">-gravity</a> setting occurs before another option
				4463	or setting having a <var>geometry</var> argument that specifies an
				4464	offset, the offset is usually applied to the point within the image suggested
				4465	by the <a href="command-line-options.html#gravity">-gravity</a> argument. Thus, in the following
				4466	command, for example, suppose the file <code>image.png</code> has dimensions
				4467	200x100. The offset specified by the argument to <a href="command-line-options.html#region">-region</a>
				4468	is (−40,+20). The argument to <a href="command-line-options.html#gravity">-gravity</a> is
				4469	<code>Center</code>, which suggests the midpoint of the image, at the point
				4470	(100,50). The offset (−40,20) is applied to that point, giving
				4471	(100−40,50+20)=(60,70), so the specified 10x10 region is located at
				4472	that point. (In addition, the <a href="command-line-options.html#gravity">-gravity</a> affects the
				4473	region itself, which is <var>centered</var> at the pixel
				4474	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>
				4475
				4476	<pre>
				4477	convert image.png -gravity Center -region 10x10-40+20 \
				4478	-negate output.png
				4479	</pre>
				4480
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4481	<p>When used as an option to <a href="composite.html">composite</a>, <a
				4482	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]	4483	within the composite.</p>
				4484
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4485	<p>When used as an option to <a href="montage.html">montage</a>, <a
				4486	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]	4487	within a tile. The default gravity is <code>Center</code> for this purpose.</p>
				4488
				4489
				4490	<div style="margin: auto;">
				4491	<h3 class="magick-header"><a id="grayscale"></a>-grayscale <var>method</var></h3>
				4492	</div>
				4493
				4494	<p class="magick-description">convert image to grayscale.</p>
				4495
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4496	<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]	4497	convert the given image into a linear-grayscale image. </p>
				4498
				4499	<p>For example, to convert an image to (linear) Rec709Luminance grayscale, type:</p>
				4500
				4501	<pre>
				4502	convert in.png -grayscale Rec709Luminance out.png
				4503	</pre>
				4504
				4505	<p>which is equivalent to:</p>
				4506
				4507	<pre>
				4508	convert in.png -colorspace gray out.png
				4509	</pre>
				4510
				4511	<p>Similarly, to convert an image to (non-linear) Rec709Luma grayscale, type:</p>
				4512
				4513	<pre>
				4514	convert in.png -grayscale Rec709Luma out.png
				4515	</pre>
				4516
				4517	<p>which is equivalent to:</p>
				4518
				4519	<pre>
				4520	convert in.png -set colorspace RGB -colorspace gray out.png
				4521	</pre>
				4522
				4523	<p>Note that a 'colorspace' intensity method will produce the same result
				4524	regardless of the current colorpsace of the image. But a 'mathematical'
				4525	intensity method will depend on the current colorspace the image is currently
				4526	using. </p>
				4527
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4528	<p>While this operation uses an <a href="command-line-options.html#intensity" >-intensity</a> method,
				4529	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]	4530	will not effect other operations that may use that setting.</p>
				4531
				4532
				4533	<div style="margin: auto;">
				4534	<h3 class="magick-header"><a id="green-primary"></a>-green-primary <var>x,y</var></h3>
				4535	</div>
				4536
				4537	<p class="magick-description">green chromaticity primary point.</p>
				4538
				4539
				4540	<div style="margin: auto;">
				4541	<h3 class="magick-header"><a id="hald-clut"></a>-hald-clut</h3>
				4542	</div>
				4543
				4544	<p class="magick-description">apply a Hald color lookup table to the image.</p>
				4545
				4546	<p>A Hald color lookup table is a 3-dimensional color cube mapped to 2
				4547	dimensions. Create it with the <code>HALD:</code> prefix (e.g. HALD:8). You
				4548	can apply any color transformation to the Hald image and then use this option
				4549	to apply the transform to the image. </p>
				4550
				4551	<pre>
				4552	convert image.png hald.png -hald-clut transform.png
				4553	</pre>
				4554
				4555	<p>This option provides a convenient method for you to use Gimp or Photoshop
				4556	to make color corrections to the Hald CLUT image and subsequently apply them
				4557	to multiple images using an ImageMagick script. </p>
				4558
				4559	<p>Note that the representation is only of the normal RGB color space and that
				4560	the whole color value triplet is used for the interpolated lookup of the
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4561	represented Hald color cube image. Because of this the operation is not <a
				4562	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]	4563	images transparency or alpha/matte channel.</p>
				4564
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4565	<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]	4566	of the individual color channels, usually involving a simpler grayscale
				4567	image. E.g: grayscale to color replacement, or modification by a histogram
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4568	mapping. </p>
				4569
				4570
				4571	<div style="margin: auto;">
				4572	<h3 class="magick-header"><a id="help"></a>-help</h3>
				4573	</div>
				4574
				4575	<p class="magick-description">print usage instructions.</p>
				4576
				4577	<div style="margin: auto;">
				4578	<h3 class="magick-header"><a id="highlight-color"></a>-highlight-color <var>color</var></h3>
				4579	</div>
				4580
				4581	<p class="magick-description">when comparing images, emphasize pixel differences with this color.</p>
				4582
				4583	<div style="margin: auto;">
				4584	<h3 class="magick-header"><a id="hough-lines"></a>-hough-lines <var>width</var>x<var>height</var>{<var>+threshold</var>}</h3>
				4585	</div>
				4586
				4587	<p class="magick-description">identify straight lines in the image (e.g. -hough-lines 9x9+195).</p>
				4588
				4589	<p>Use the Hough line detector with any binary edge extracted image to locate and draw any straight lines that it finds.</p>
				4590
				4591	<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>.
				4592
				4593	<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>
				4594
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4595	<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]	4596
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4597	<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]	4598
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4599	<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]	4600
				4601	<p>A text file listing the endpoints and counts may be created by using the suffix, .mvg, for the output image.</p>
				4602
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4603	<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]	4604
				4605	<div style="margin: auto;">
				4606	<h3 class="magick-header"><a id="iconGeometry"></a>-iconGeometry <var>geometry</var></h3>
				4607	</div>
				4608
				4609	<p class="magick-description">specify the icon geometry.</p>
				4610
				4611	<p>Offsets, if present in the geometry specification, are handled in the same
				4612	manner as the <a href="command-line-options.html#geometry">-geometry</a> option, using X11 style to
				4613	handle negative offsets.</p>
				4614
				4615	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				4616
				4617	<div style="margin: auto;">
				4618	<h3 class="magick-header"><a id="iconic"></a>-iconic</h3>
				4619	</div>
				4620
				4621	<p class="magick-description">start in icon mode in X Windows", 'animate', 'display</p>
				4622
				4623	<div style="margin: auto;">
				4624	<h3 class="magick-header"><a id="identify"></a>-identify</h3>
				4625	</div>
				4626
				4627	<p class="magick-description">identify the format and characteristics of the image.</p>
				4628
				4629	<p>This information is printed: image scene number; image name; image size;
				4630	the image class (<var>DirectClass</var> or <var>PseudoClass</var>); the total number of unique colors; and the
				4631	number of seconds to read and transform the image. Refer to <a href="miff.html">MIFF</a> for
				4632	a description of the image class.</p>
				4633
				4634	<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]	4635	in the image and color reduction error values are printed. Refer to <a
Cristy	6549abb	2016-11-10 08:25:55 -0500	[diff] [blame]	4636	href="http://www.imagemagick.org/www/quantize.html">color
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4637	reduction algorithm</a> for a description of these values.</p>
				4638
				4639	<p>If <a href="command-line-options.html#verbose">-verbose</a> precedes this option, copious
				4640	amounts of image properties are displayed including image statistics, profiles,
				4641	image histogram, and others.</p>
				4642
				4643	<div style="margin: auto;">
				4644	<h3 class="magick-header"><a id="ift"></a>-ift</h3>
				4645	</div>
				4646
				4647	<p class="magick-description">implements the inverse discrete Fourier transform (DFT).</p>
				4648
				4649	<p>This option is new as of ImageMagick 6.5.4-3 (and now working for Windows
				4650	users in ImageMagick 6.6.0-9). It transforms a pair of magnitude and phase
				4651	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]	4652	domain. See for example, <a
				4653	href="http://en.wikipedia.org/wiki/Fourier_transform">Fourier Transform</a>,
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4654	<a href="http://en.wikipedia.org/wiki/DFT">Discrete Fourier Transform</a> and
				4655	<a href="http://en.wikipedia.org/wiki/FFT">Fast Fourier Transform</a>.</p>
				4656
				4657	<p>For example, depending upon the image format used to store the result of
				4658	the <a href="command-line-options.html#fft">-fft</a>, one would use either</p>
				4659
				4660	<pre>
				4661	convert fft_image.miff -ift fft_image_ift.png
				4662	</pre>
				4663
				4664	<p>or</p>
				4665
				4666	<pre>
				4667	convert fft_image-0.png fft_image-1.png -ift fft_image_ift.png
				4668	</pre>
				4669
				4670	<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]	4671	the original image, prior to the <a href="command-line-options.html#fft">-fft</a> or <a
				4672	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]	4673	the right and/or bottom sides of the image.</p>
				4674
				4675	<p>The <a href="http://www.fftw.org/">FFTW</a> delegate library is required to
				4676	use <a href="command-line-options.html#ift">-ift</a>.</p>
				4677
				4678	<p>Use <a href="command-line-options.html#ift">+ift</a> (with HDRI enabled) to transform a pair of real
				4679	and imaginary images from the frequency domain to a single image in the normal
				4680	(spatial) domain.</p>
				4681
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4682	<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]	4683
				4684	<div style="margin: auto;">
				4685	<h3 class="magick-header"><a id="immutable"></a>-immutable</h3>
				4686	</div>
				4687
				4688	<p class="magick-description">make image immutable.</p>
				4689
				4690	<div style="margin: auto;">
				4691	<h3 class="magick-header"><a id="implode"></a>-implode <var>factor</var></h3>
				4692	</div>
				4693
				4694	<p class="magick-description">implode image pixels about the center.</p>
				4695
				4696	<div style="margin: auto;">
				4697	<h3 class="magick-header"><a id="insert"></a>-insert <var>index</var></h3>
				4698	</div>
				4699
				4700	<p class="magick-description">insert the last image into the image sequence.</p>
				4701
				4702	<p>This option takes last image in the current image sequence and inserts it
				4703	at the given index. If a negative index is used, the insert position is
				4704	calculated before the last image is removed from the sequence. As such
				4705	<code>-insert -1</code> will result in no change to the image sequence.</p>
				4706
				4707	<p>The <code>+insert</code> option is equivalent to <code>-insert -1</code>. In
				4708	other words, insert the last image, at the end of the current image sequence.
				4709	Consequently this has no effect on the image sequence order.</p>
				4710
				4711	<div style="margin: auto;">
				4712	<h3 class="magick-header"><a id="intensity"></a>-intensity <var>method</var></h3>
				4713	</div>
				4714
				4715	<p class="magick-description">method to generate intensity value from pixel.</p>
				4716
				4717	<p>ImageMagick provides a number of methods used in situations where an
				4718	operator needs to determine a single grayscale value for some purpose, from
				4719	an image with red, green, and blue pixel components. Typically the linear
				4720	<code>Rec709Luminance</code> formula is used, which is the same formula used when
				4721	converting images to <code>-colorspace gray</code>. </p>
				4722
				4723	<p>The following formulas are currently provided, and will first convert
				4724	the pixel values to linear-RGB or non-linear sRGB colorspace before
				4725	being applied to calculate the final greyscale value. </p>
				4726
				4727	<dl class="dl-horizontal">
				4728	<dt>Rec601Luma</dt><dd> 0.298839R' + 0.586811G'+ 0.114350B'</dd>
				4729	<dt>Rec601Luminance</dt><dd> 0.298839R + 0.586811G + 0.114350B</dd>
				4730	<dt>Rec709Luma</dt><dd> 0.212656R' + 0.715158G' + 0.072186B'</dd>
				4731	<dt>Rec709Luminance</dt><dd> 0.212656R + 0.715158G + 0.072186B</dd>
				4732	<dt>Brightness</dt><dd> max(R', G', B')</dd>
				4733	<dt>Lightness</dt><dd> (min(R', G', B') + max(R', G', B')) / 2.0</dd>
				4734	</dl>
				4735
				4736	<p>Note that the above R,G,B values is the image's linear-RGB values, while
				4737	R',G',B' are sRGB non-linear values. </p>
				4738
				4739	<p>These intensity methods are mathematical in nature and will use the
				4740	current value in the images respective R,G,B channel regardless of
				4741	what that is, or what colorspace the image is currently using.</p>
				4742
				4743	<dl class="dl-horizontal">
				4744	<dt>Average</dt><dd>(R + G + B) / 3.0</dd>
				4745	<dt>MS</dt><dd>(R^2 + G^2 + B^2) / 3.0</dd>
				4746	<dt>RMS</dt><dd>sqrt( (R^2 + G^2 + B^2) / 3.0 )</dd>
				4747	</dl>
				4748
				4749	<p>These methods are often used for other purposes, such as generating a
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4750	grayscale difference image between two color images (using <a href="command-line-options.html#compose"
				4751	>-compose</a> '<code>Difference</code>' composition. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4752
				4753	<p> For example The 'MS' (Mean Squared) setting is good for minimizing color
				4754	error comparisions. While... The method 'RMS' (Root Mean Squared) for
				4755	example is appropriate for calculating color vector distance, from a color
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4756	difference image. This is equivalent to the color only component of the <a
				4757	href="command-line-options.html#fuzz" >-fuzz</a> factor color compare setting. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4758
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4759	<p>See also <a href="command-line-options.html#grayscale" >-grayscale</a> which applies one of the above
				4760	grayscaling formula directly to an image without setting the <a
				4761	href="command-line-options.html#intensity" >-intensity</a> setting.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4762
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4763	<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]	4764	the current intensity setting, but will always convert the image to the
				4765	appropriate sRGB or linear-RGB colorspace before appling the above
				4766	function.</p>
				4767
				4768	<p>To print a complete list of possible pixel intensity setting methods, use <a href="command-line-options.html#list">-list intensity</a>.</p>
				4769
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4770	<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]	4771
				4772	<pre>
				4773	-adaptive-blur
				4774	-adaptive-sharpen
				4775	-black-threshold
				4776	-clut (when mapping greyscale CLUT image to alpha channel if set by -channels)
				4777	-colors for gray colorspace
				4778	-compose {LightenIntensity, DarkenIntensity, CopyOpacity, CopyBlack}
				4779	-contrast-stretch
				4780	-distort {ErodeIntensity, DilateIntensity}
				4781	-normalize
				4782	-random-threshold
				4783	-selective-blur
				4784	-shade
				4785	-threshold
				4786	-tint
				4787	-white-threshold
				4788	</pre>
				4789
				4790	<div style="margin: auto;">
				4791	<h3 class="magick-header"><a id="intent"></a>-intent <var>type</var></h3>
				4792	</div>
				4793
				4794	<p class="magick-description">use this type of rendering intent when managing the image color.</p>
				4795
				4796	<p>Use this option to affect the color management operation of an image (see
				4797	<a href="command-line-options.html#profile">-profile</a>). Choose from these intents: <code>Absolute,
				4798	Perceptual, Relative, Saturation</code>.</p>
				4799
				4800	<p>The default intent is Perceptual for the sRGB colorspace and undefined for the RGB and gray colorspaces.</p>
				4801
				4802	<p>To print a complete list of rendering intents, use <a href="command-line-options.html#list">-list intent</a>.</p>
				4803
				4804	<div style="margin: auto;">
				4805	<h3 class="magick-header"><a id="interlace"></a>-interlace <var>type</var></h3>
				4806	</div>
				4807
				4808	<p class="magick-description">the type of interlacing scheme.</p>
				4809
				4810	<p>Choose from:</p>
				4811
				4812	<pre>
				4813	none
				4814	line
				4815	plane
				4816	partition
				4817	JPEG
				4818	GIF
				4819	PNG
				4820	</pre>
				4821
				4822	<p>This option is used to specify the type of interlacing scheme for raw image
				4823	formats such as <code>RGB</code> or <code>YUV</code>.</p>
				4824
				4825	<p><code>None</code> means do not interlace (RGBRGBRGBRGBRGBRGB...),</p>
				4826
				4827	<p><code>Line</code> uses scanline interlacing (RRR...GGG...BBB...RRR...GGG...BBB...), and.</p>
				4828
				4829	<p><code>Plane</code> uses plane interlacing (RRRRRR...GGGGGG...BBBBBB...).</p>
				4830
				4831	<p><code>Partition</code> is like plane except the different planes are saved to
				4832	individual files (e.g. image.R, image.G, and image.B).</p>
				4833
				4834	<p>Use <code>Line</code> or <code>Plane</code> to create an <code>interlaced
				4835	PNG</code> or <code>GIF</code> or <code>progressive JPEG</code> image.</p>
				4836
				4837	<p>To print a complete list of interlacing schemes, use <a href="command-line-options.html#list">-list
				4838	interlace</a>.</p>
				4839
				4840	<div style="margin: auto;">
				4841	<h3 class="magick-header"><a id="interpolate"></a>-interpolate <var>type</var></h3>
				4842	</div>
				4843
				4844	<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>
				4845
				4846	<p>When looking up the color of a pixel using a non-integer floating point
				4847	value, you typically fall in between the pixel colors defined by the source
				4848	image. This setting determines how the color is determined from the colors of
				4849	the pixels surrounding that point. That is how to determine the color of a
				4850	point that falls between two, or even four different colored pixels. </p>
				4851
				4852	<dl class="dl-horizontal">
				4853	<dt>integer</dt>
				4854	<dd>The color of the top-left pixel (floor function)</dd>
				4855	<dt>nearest-neighbor</dt>
				4856	<dd>The nearest pixel to the lookup point (rounded function)</dd>
				4857	<dt>average</dt>
				4858	<dd>The average color of the surrounding four pixels</dd>
				4859	<dt>bilinear</dt>
				4860	<dd>A double linear interpolation of pixels (the default)</dd>
				4861	<dt>mesh</dt>
				4862	<dd>Divide area into two flat triangular interpolations</dd>
				4863	<dt>bicubic</dt>
				4864	<dd>Fitted bicubic-spines of surrounding 16 pixels</dd>
				4865	<dt>spline</dt>
				4866	<dd>Direct spline curves (colors are blurred)</dd>
				4867	<dt>filter</dt>
				4868	<dd>Use resize <a href="command-line-options.html#filter">-filter</a> settings</dd>
				4869	</dl>
				4870
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4871	<p>This most important for distortion operators such as <a href="command-line-options.html#distort"
				4872	>-distort</a>, <a href="command-line-options.html#implode" >-implode</a>, <a href="command-line-options.html#transform"
				4873	>-transform</a> and <a href="command-line-options.html#fx" >-fx</a>. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4874
				4875	<p>To print a complete list of interpolation methods, use <a href="command-line-options.html#list">-list interpolate</a>.</p>
				4876
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4877	<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]	4878	lookup for positions outside the boundaries of the image. </p>
				4879
				4880
				4881	<div style="margin: auto;">
				4882	<h3 class="magick-header"><a id="interline-spacing"></a>-interline-spacing <var>value</var></h3>
				4883	</div>
				4884
				4885	<p class="magick-description">the space between two text lines.</p>
				4886
				4887	<div style="margin: auto;">
				4888	<h3 class="magick-header"><a id="interword-spacing"></a>-interword-spacing <var>value</var></h3>
				4889	</div>
				4890
				4891	<p class="magick-description">the space between two words.</p>
				4892
				4893	<div style="margin: auto;">
				4894	<h3 class="magick-header"><a id="kerning"></a>-kerning <var>value</var></h3>
				4895	</div>
				4896
				4897	<p class="magick-description">the space between two letters.</p>
				4898
				4899	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4900	<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]	4901	</div>
				4902
				4903	<p class="magick-description">edge preserving noise reduction filter.</p>
				4904
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4905	<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]	4906
				4907
				4908	<div style="margin: auto;">
				4909	<h3 class="magick-header"><a id="label"></a>-label <var>name</var></h3>
				4910	</div>
				4911
				4912	<p class="magick-description">assign a label to an image.</p>
				4913
				4914	<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]	4915	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]	4916	a the labels of images already read in. Image formats such as TIFF, PNG,
				4917	MIFF, supports saving the label information with the image.</p>
				4918
				4919	<p>When saving an image to a <var>PostScript</var> file, any label
				4920	assigned to an image is used as a header string to print above the postscript
				4921	image. </p>
				4922
				4923	<p>You can include the image filename, type, width, height, or other image
				4924	attribute by embedding special format character. See <a href="escape.html">Format and Print Image
				4925	Properties</a> for details of the percent escape codes.</p>
				4926
				4927	<p>For example,</p>
				4928
				4929	<pre>
				4930	-label "%m:%f %wx%h" bird.miff
				4931	</pre>
				4932
				4933	<p>assigns an image label of <code>MIFF:bird.miff 512x480</code> to the
				4934	"<code>bird.miff</code>" image and whose width is 512 and height is 480, as it
				4935	is read in. If a <a href="command-line-options.html#label">+label</a> option was used instead, any
				4936	existing label present in the image would be used. You can remove all labels
				4937	from an image by assigning the empty string. </p>
				4938
				4939	<p>A label is not drawn on the image, but is embedded in the image datastream
				4940	via <var>Label</var> tag or similar mechanism. If you want the label to be
				4941	visible on the image itself, use the <a href="command-line-options.html#draw">-draw</a> option, or
				4942	during the final processing in the creation of an image montage.</p>
				4943
				4944	<p>If the first character of <var>string</var> is <var>@</var>, the image label is read from a file titled by the
				4945	remaining characters in the string. Labels in a file are literal, no embedded
				4946	formatting characters are recognized.</p>
				4947
				4948
				4949	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4950	<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]	4951	</div>
				4952
				4953	<p class="magick-description">perform local adaptive threshold.</p>
				4954
				4955	<p>Adaptively threshold each pixel based on the value of pixels in a
				4956	surrounding window. If the current pixel is lighter than this average plus
				4957	the optional <code>offset</code>, then it is made white, otherwise it is made
				4958	black. Small variations in pixel values such as found in scanned documents
				4959	can be ignored if offset is positive. A negative offset will make it more
				4960	sensitive to those small variations. </p>
				4961
				4962	<p>This is commonly used to threshold images with an uneven background. It is
				4963	based on the assumption that average color of the small window is the
				4964	the local background color, from which to separate the foreground color. </p>
				4965
				4966
				4967	<div style="margin: auto;">
				4968	<h3 class="magick-header"><a id="layers"></a>-layers <var>method</var></h3>
				4969	</div>
				4970
				4971	<p class="magick-description">handle multiple images forming a set of image layers or animation frames.</p>
				4972
				4973	<p>Perform various image operation methods to a ordered sequence of images
				4974	which may represent either a set of overlaid 'image layers', a GIF disposal
				4975	animation, or a fully-'coalesced' animation sequence. </p>
				4976
				4977	<table class="table table-condensed table-striped">
				4978	<tbody>
				4979	<tr>
				4980	<th style="width: 8%">Method</th>
				4981	<th>Description</th>
				4982	</tr>
				4983
				4984	<tr>
				4985	<td>compare-any</td>
				4986	<td>Crop the second and later frames to the smallest rectangle
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4987	that contains all the differences between the two images. No GIF <a
				4988	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]	4989	</tr>
				4990
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	4991	<tr><td></td><td>This exactly the same as the <a href="command-line-options.html#deconstruct"
				4992	>-deconstruct</a> operator, and does not preserve animations normal
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	4993	working, especially when animation used layer disposal methods such as
				4994	'<code>Previous</code>' or '<code>Background</code>'. </td>
				4995	</tr>
				4996
				4997	<tr>
				4998	<td>compare-clear</td>
				4999	<td>As '<code>compare-any</code>' but crop to the bounds of any
				5000	opaque pixels which become transparent in the second frame. That is the
				5001	smallest image needed to mask or erase pixels for the next frame. </td>
				5002	</tr>
				5003
				5004	<tr>
				5005	<td>compare-overlay</td>
				5006	<td>As '<code>compare-any</code>' but crop to pixels that add
				5007	extra color to the next image, as a result of overlaying color pixels.
				5008	That is the smallest single overlaid image to add or change colors. </td>
				5009	</tr>
				5010
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5011	<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]	5012	composition method '<code>change-mask</code>', to reduce the image to
				5013	just the pixels that need to be overlaid. </td>
				5014	</tr>
				5015
				5016	<tr>
				5017	<td>coalesce</td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5018	<td>Equivalent to a call to the <a href="command-line-options.html#coalesce"
				5019	>-coalesce</a> operator. Apply the layer disposal methods set in the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5020	current image sequence to form a fully defined animation sequence, as
				5021	it should be displayed. Effectively converting a GIF animation into a
				5022	'film strip'-like animation. </td>
				5023	</tr>
				5024
				5025	<tr>
				5026	<td>composite</td>
				5027	<td>Alpha Composition of two image lists, separated by a
				5028	"<code>null:</code>" image, with the destination image list first, and
				5029	the source images last. An image from each list are composited
				5030	together until one list is finished. The separator image and source
				5031	image lists are removed. </td>
				5032	</tr>
				5033
				5034
				5035	<tr><td></td>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5036	<td>The <a href="command-line-options.html#geometry" >-geometry</a> offset is adjusted according
				5037	to <a href="command-line-options.html#gravity" >-gravity</a> in accordance of the virtual
				5038	canvas size of the first image in each list. Unlike a normal <a
				5039	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]	5040	added to the final composite positioning of each image. </td> </tr>
				5041
				5042	<tr><td></td>
				5043	<td>If one of the image lists only contains one image, that image is
				5044	applied to all the images in the other image list, regardless of which
				5045	list it is. In this case it is the image meta-data of the list which
				5046	preserved. </td>
				5047	</tr>
				5048
				5049
				5050	<tr>
				5051	<td>dispose</td>
				5052	<td>This like '<code>coalesce</code>' but shows the look of
				5053	the animation after the layer disposal method has been applied, before
				5054	the next sub-frame image is overlaid. That is the 'dispose' image that
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5055	results from the application of the GIF <a href="command-line-options.html#dispose"
				5056	>-dispose</a> method. This allows you to check what
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5057	is going wrong with a particular animation you may be developing.
				5058	</td>
				5059	</tr>
				5060
				5061	<tr>
				5062	<td>flatten</td>
				5063	<td>Create a canvas the size of the first images virtual
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5064	canvas using the current <a href="command-line-options.html#background" >-background</a> color,
				5065	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]	5066	canvas. Images falling outside that canvas is clipped. Final
				5067	image will have a zero virtual canvas offset. </td>
				5068	</tr>
				5069
				5070	<tr><td></td>
				5071	<td>This usually used as one of the final 'image layering' operations
				5072	overlaying all the prepared image layers into a final image. </td>
				5073	</tr>
				5074
				5075	<tr><td></td>
				5076	<td>For a single image this method can also be used to fillout a virtual
				5077	canvas with real pixels, or to underlay an opaque color to remove
				5078	transparency from an image.</td>
				5079	</tr>
				5080
				5081
				5082	<tr>
				5083	<td>merge</td>
				5084	<td>As 'flatten' method but merging all the given image
				5085	layers to create a new layer image just large enough to hold all the
				5086	image without clipping or extra space. The new images virtual offset
				5087	will preserve the position of the new layer, even if this offset is
				5088	negative. The virtual canvas size of the first image is preserved.
				5089	</td>
				5090	</tr>
				5091
				5092	<tr><td></td><td>Caution is advised when handling image layers with
				5093	negative offsets as few image file formats handle them correctly.
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5094	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]	5095	will remove the layer offset, and create an image in which all the
				5096	overlaid image positions relative to each other is preserved, though
				5097	not necessarily exactly where you specified them.
				5098	</td>
				5099	</tr>
				5100
				5101	<tr><td></td><td>See also 'trim-bounds' below which is closely related but
				5102	without doing the'flatten' to merge the images together. </td>
				5103	</tr>
				5104
				5105	<tr>
				5106	<td>mosaic</td>
				5107	<td>As 'flatten' method but expanding the initial canvas size
				5108	of the first image in a positive direction only so as to hold all the
				5109	image layers. However as a virtual canvas is 'locked' to the origin,
				5110	by its own definition, image layers with a negative offsets will still
				5111	become clipped by the top and left edges. See 'merge' or 'trim-bounds'
				5112	if this could be a problem. </td>
				5113
				5114	</tr>
				5115
				5116	<tr><td></td><td>This method is commonly used to layout individual image
				5117	using various offset but without knowing the final canvas size. The
				5118	resulting image will, like 'flatten' not have any virtual offset, so
				5119	can be saved to any image file format. </td>
				5120	</tr>
				5121
				5122
				5123	<tr>
				5124	<td>optimize</td>
				5125	<td>Optimize a coalesced animation, into GIF animation using
				5126	a number of general techniques. This currently a short cut to
				5127	apply both the '<code>optimize-frame</code>', and
				5128	'<code>optimize-transparency</code>' methods but may be expanded to
				5129	include other optimization methods as they are developed. </td>
				5130	</tr>
				5131
				5132	<tr>
				5133	<td>optimize-frame</td>
				5134	<td>Optimize a coalesced animation, into GIF animation by
				5135	reducing the number of pixels per frame as much as possible by
				5136	attempting to pick the best layer disposal method to use, while ensuring
				5137	the result will continue to animate properly. </td>
				5138	</tr>
				5139
				5140	<tr><td></td><td> There is no guarantee that the best optimization is found.
				5141	But then no reasonably fast GIF optimization algorithm can do this.
				5142	However this does seem to do better than most other GIF frame
				5143	optimizers seen. </td>
				5144	</tr>
				5145
				5146	<tr>
				5147	<td>optimize-plus</td>
				5148	<td>As '<code>optimize-frame</code>' but attempt to improve the
				5149	overall optimization by adding extra frames to the animation, without
				5150	changing the final look or timing of the animation. The frames are
				5151	added to attempt to separate the clearing of pixels from the
				5152	overlaying of new additional pixels from one animation frame to the
				5153	next. If this does not improve the optimization (for the next frame
				5154	only), it will fall back to the results of the previous normal
				5155	'<code>optimize-frame</code>' technique. </td>
				5156	</tr>
				5157
				5158	<tr><td></td><td>There is the possibility that the change in the disposal
				5159	style will result in a worsening in the optimization of later frames,
				5160	though this is unlikely. In other words there no guarantee that it is
				5161	better than the normal '<code>optimize-frame</code>' technique. For some
				5162	animations however you can get a vast improvement in the final
				5163	animation size. </td>
				5164	</tr>
				5165
				5166	<tr>
				5167	<td>optimize-transparency</td>
				5168	<td>Given a GIF animation, replace any pixel in the sub-frame
				5169	overlay images with transparency, if it does not change the resulting
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5170	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]	5171	</td>
				5172	</tr>
				5173
				5174	<tr><td></td><td>This should allow a existing frame optimized GIF animation
				5175	to compress into a smaller file size due to larger areas of one
				5176	(transparent) color rather than a pattern of multiple colors repeating
				5177	the current disposed image of the last frame. </td>
				5178	</tr>
				5179
				5180	<tr>
				5181	<td>remove-dups</td>
				5182	<td>Remove (and merge time delays) of duplicate consecutive
				5183	images, so as to simplify layer overlays of coalesced animations.
				5184	</td>
				5185	</tr>
				5186
				5187	<tr><td></td><td>Usually this a result of using a constant time delay
				5188	across the whole animation, or after a larger animation was split into
				5189	smaller sub-animations. The duplicate frames could also have been
				5190	used as part of some frame optimization methods. </td>
				5191	</tr>
				5192
				5193	<tr>
				5194	<td>remove-zero</td>
				5195	<td>Remove any image with a zero time delay, unless ALL the
				5196	images have a zero time delay (and is not a proper timed animation, a
				5197	warning is then issued). </td>
				5198	</tr>
				5199
				5200	<tr><td></td><td>In a GIF animation, such images are usually frames which
				5201	provide partial intermediary updates between the frames that are
				5202	actually displayed to users. These frames are usually added for
				5203	improved frame optimization in GIF animations. </td>
				5204	</tr>
				5205
				5206	<tr>
				5207	<td>trim-bounds</td>
				5208	<td>Find the bounds of all the images in the current
				5209	image sequence, then adjust the offsets so all images are contained on
				5210	a minimal positive canvas. None of the image data is modified or
				5211	merged, only the individual image virtual canvas size and offset.
				5212	All the images is given the same canvas size, and and will have
				5213	a positive offset, but will remain in the same position relative to
				5214	each other. As a result of the minimal canvas size at least one image
				5215	will touch every edge of that canvas. The image data touching those
				5216	edges however may be transparent. </td>
				5217	</tr>
				5218
				5219	<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]	5220	<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]	5221	have been kept separate. If 'flatten' is used after using
				5222	'trim-bounds' you will get the same result. </td>
				5223	</tr>
				5224
				5225	</tbody>
				5226	</table>
				5227
				5228	<p>To print a complete list of layer types, use <a href="command-line-options.html#list">-list layers</a>.</p>
				5229
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5230	<p>The operators <a href="command-line-options.html#coalesce" >-coalesce</a>, <a href="command-line-options.html#deconstruct"
				5231	>-deconstruct</a>, <a href="command-line-options.html#flatten" >-flatten</a>, and <a href="command-line-options.html#mosaic"
				5232	>-mosaic</a> are only aliases for the above methods and may be depreciated in
				5233	the future. Also see <a href="command-line-options.html#page" >-page</a>, <a href="command-line-options.html#repage"
				5234	>-repage</a> operators, the <a href="command-line-options.html#compose" >-compose</a> setting, and the
				5235	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]	5236	settings. </p>
				5237
				5238
				5239	<div style="margin: auto;">
				5240	<h3 class="magick-header"><a id="level"></a>-level <var>black_point</var>{,<var>white_point</var>}{<var>%</var>}{,<var>gamma</var>}</h3>
				5241	</div>
				5242
				5243	<p class="magick-description">adjust the level of image channels.</p>
				5244
				5245	<p>Given one, two or three values delimited with commas: black-point,
				5246	white-point, gamma (for example: 10,250,1.0 or 2%,98%,0.5). The black and
				5247	white points range from 0 to <var>QuantumRange</var>, or from 0 to
				5248	100%; if the white point is omitted it is set to (<var>QuantumRange</var> - black_point), so as to center contrast changes.
				5249	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]	5250	points are percentages of the full color range. Gamma will do a <a
				5251	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]	5252	default of 1.0 (no gamma correction) is assumed.</p>
				5253
				5254	<p>In normal usage (<code>-level</code>) the image values are stretched so that
				5255	the given '<code>black_point</code>' value in the original image is set to zero
				5256	(or black), while the given '<code>white_point</code>' value is set to <var>QuantumRange</var> (or white). This provides you with direct
				5257	contrast adjustments to the image. The '<code>gamma</code>' of the resulting
				5258	image will then be adjusted. </p>
				5259
				5260	<p>From ImageMagick v6.4.1-9 using the plus form of the operator
				5261	(<code>+level</code>) or adding the special '!' flag anywhere in the argument
				5262	list, will cause the operator to do the reverse of the level adjustment. That
				5263	is a zero, or <var>QuantumRange</var> value (black, and white, resp.)
				5264	in the original image, is adjusted to the given level values, allowing you to
				5265	de-contrast, or compress the channel values within the image. The
				5266	'<code>gamma</code>' is adjusted before the level adjustment to de-contrast the
				5267	image is made. </p>
				5268
				5269	<p>Only the channels defined by the current <a href="command-line-options.html#channel">-channel</a>
				5270	setting are adjusted (defaults to RGB color channels only), allowing you to
				5271	limit the effect of this operator. </p>
				5272
				5273	<p>Please note that the transparency channel is treated as 'matte'
				5274	values (0 is opaque) and not as 'alpha' values (0 is transparent).</p>
				5275
				5276
				5277	<div style="margin: auto;">
				5278	<h3 class="magick-header"><a id="level-colors"></a>-level-colors {<var>black_color</var>}{,}{<var>white_color</var>}</h3>
				5279	</div>
				5280
				5281	<p class="magick-description">adjust the level of an image using the provided dash separated colors.</p>
				5282
				5283	<p>This function is exactly like <a href="command-line-options.html#level">-level</a>, except that the
				5284	value value for each color channel is determined by the
				5285	'<code>black_color</code>' and '<code>white_color</code>' colors given (as
				5286	described under the <a href="command-line-options.html#fill">-fill</a> option). </p>
				5287
				5288	<p>This effectually means the colors provided to <code>-level-colors</code>
				5289	is mapped to become 'black' and 'white' respectively, with all the other
				5290	colors linearly adjusted (or clipped) to match that change. Each channel is
				5291	adjusted separately using the channel values of the colors specified. </p>
				5292
				5293	<p>On the other hand the plus form of the operator (<code>+level-colors</code>)
				5294	will map the image color 'black' and 'white' to the given colors
				5295	respectively, resulting in a gradient (de-contrasting) tint of the image to
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	5296	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]	5297	one using the gradient of colors specified. </p>
				5298
				5299	<p>By supplying a single color with a comma separator either before or after
				5300	that color, will just replace the respective 'black' or 'white' point
				5301	respectively. But if no comma separator is provided, the given color is
				5302	used for both the black and white color points, making the operator either
				5303	threshold the images around that color (- form) or set all colors to that
				5304	color (+ form). </p>
				5305
				5306
				5307	<div style="margin: auto;">
				5308	<h3 class="magick-header"><a id="limit"></a>-limit <var>type value</var></h3>
				5309	</div>
				5310
				5311	<p class="magick-description">Set the pixel cache resource limit.</p>
				5312
Cristy	e09ed31	2016-03-06 08:07:39 -0500	[diff] [blame]	5313	<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]	5314
				5315	<p>The value for <code>file</code> is in number of files. The other limits are
				5316	in bytes. Define arguments for the memory, map, area, and disk resource limits
				5317	with SI prefixes (.e.g 100MB).</p>
				5318
				5319	<p>By default the limits are 768 files, 3GB of image area, 1.5GiB memory, 3GiB
				5320	memory map, and 18.45EB of disk. These limits are adjusted relative to the
				5321	available resources on your computer if this information is available. When
				5322	any limit is reached, ImageMagick fails in some fashion but attempts to take
				5323	compensating actions, if possible. For example, the following limits
				5324	memory:</p>
				5325
				5326	<pre>
				5327	-limit memory 32MiB -limit map 64MiB
				5328	</pre>
				5329
				5330	<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>
				5331
				5332	<pre>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5333	-> identify -list resource
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5334	Resource limits:
				5335	Width: 100MP
				5336	Height: 100MP
				5337	Area: 25.181GB
				5338	Memory: 11.726GiB
				5339	Map: 23.452GiB
				5340	Disk: unlimited
				5341	File: 768
				5342	Thread: 12
				5343	Throttle: 0
				5344	Time: unlimited
				5345	</pre>
				5346
				5347	<p>Requests for pixel storage to keep intermediate images are satisfied by one
				5348	of three resource categories: in-memory pool, memory-mapped files pool, and
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5349	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]	5350	and whether the system honors a resource request. If the total size of
				5351	allocated pixel storage in the given pool reaches the corresponding limit, the
				5352	request is passed to the next pool. Additionally, requests that exceed the
				5353	<code>area</code> limit automagically are allocated on disk.</p>
				5354
				5355	<p>To illustrate how ImageMagick utilizes resource limits, consider a typical
				5356	image resource request. First, ImageMagick tries to allocate the pixels in
				5357	memory. The request might be denied if the resource request exceeds the
				5358	<code>memory</code> limit or if the system does not honor the request. If
				5359	a memory request is not honored, the pixels are allocated to disk and the file
				5360	is memory-mapped. However, if the allocation request exceeds the
				5361	<code>map</code> limit, the resource allocation goes to disk. In all cases, if
				5362	the resource request exceeds the <code>area</code> limit, the pixels are
				5363	automagically cached to disk. If the disk has a hard limit, the program
				5364	fails.</p>
				5365
				5366	<p>In most cases you simply do not need to concern yourself with resource
				5367	limits. ImageMagick chooses reasonable defaults and most images do not tax
				5368	your computer resources. Where limits do come in handy is when you process
				5369	images that are large or on shared systems where ImageMagick can consume all
				5370	or most of the available memory. In this case, the ImageMagick workflow slows
				5371	other processes or, in extreme cases, brings the system to a halt. Under
				5372	these circumstances, setting limits give some assurances that the ImageMagick
				5373	workflow will not interfere with other concurrent uses of the computer. For
				5374	example, assume you have a web interface that processes images uploaded from
				5375	the Internet. To assure ImageMagick does not exceed 10MiB of memory you can
				5376	simply set the area limit to 10MiB:</p>
				5377
				5378	<pre>
				5379	-limit area 10MB
				5380	</pre>
				5381
				5382	<p>Now whenever a large image is processed, the pixels are automagically
				5383	cached to disk instead of memory. This of course implies that large images
				5384	typically process very slowly, simply because pixel processing in memory can
				5385	be an order of magnitude faster than on disk. Because your web site users
				5386	might inadvertently upload a huge image to process, you should set a disk
				5387	limit as well:</p>
				5388
				5389	<pre>
				5390	-limit area 10MB -limit disk 500MB
				5391	</pre>
				5392
				5393	<p>Here ImageMagick stops processing if an image requires more than 500MB of disk storage.</p>
				5394
				5395	<p>In addition to command-line resource limit option, resources can be set
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5396	with <a href="resources.html#environment" >environment variables</a>. Set the
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5397	environment variables <code>MAGICK_AREA_LIMIT</code>,
				5398	<code>MAGICK_DISK_LIMIT</code>, <code>MAGICK_FILE_LIMIT</code>,
				5399	<code>MAGICK_MEMORY_LIMIT</code>, <code>MAGICK_MAP_LIMIT</code>,
				5400	<code>MAGICK_THREAD_LIMIT</code>, <code>MAGICK_TIME_LIMIT</code> for limits of
				5401	image area, disk space, open files, heap memory, memory map, number of threads
				5402	of execution, and maximum elapsed time in seconds respectively.</p>
				5403
				5404	<p> Inquisitive users can try adding <a href="command-line-options.html#debug">-debug cache</a> to
				5405	their commands and then scouring the generated output for references to the
				5406	pixel cache, in order to determine how the pixel cache was allocated and how
				5407	resources were consumed. Advanced Unix/Linux users can pipe that output
				5408	through <code>grep memory\|open\|destroy\|disk</code> for more readable sifting.
				5409	</p>
				5410
				5411	<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]	5412	Storage and Resource Requirements</b> on the <a href="architecture.html#cache
				5413	">Architecture</a> page. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5414
				5415	<div style="margin: auto;">
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	5416	<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]	5417	</div>
				5418
				5419	<p class="magick-description">Linear with saturation stretch.</p>
				5420
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5421	<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]	5422	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]	5423	be stretched. However it then stretches those colors using the <a
				5424	href="command-line-options.html#level" >-level</a> operator.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5425
				5426	<p>As such while the initial determination may have 'binning' round off
				5427	effects, the image colors are stretched mathematically, rather than using the
				5428	histogram bins. This makes the operator more accurate. </p>
				5429
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5430	<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]	5431	'<code>0</code>' does nothing, while a value of '<code>1</code>' does a near
				5432	perfect stretch of the color range. </p>
				5433
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5434	<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]	5435	normalization of mathematical images. </p>
				5436
				5437	<p>This operator is under review for re-development. </p>
				5438
				5439
				5440	<div style="margin: auto;">
				5441	<h3 class="magick-header"><a id="linewidth"></a>-linewidth</h3>
				5442	</div>
				5443
				5444	<p class="magick-description">the line width for subsequent draw operations.</p>
				5445
				5446	<div style="margin: auto;">
				5447	<h3 class="magick-header"><a id="liquid-rescale"></a>-liquid-rescale <var>geometry</var></h3>
				5448	</div>
				5449
				5450	<p class="magick-description">rescale image with seam-carving.</p>
				5451
				5452	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				5453
				5454	<div style="margin: auto;">
				5455	<h3 class="magick-header"><a id="list"></a>-list <var>type</var></h3>
				5456	</div>
				5457
				5458	<p class="magick-description">Print a list of supported arguments for various options or settings. Choose from these list types:</p>
				5459
				5460	<pre class="pre-scrollable">
				5461	Align
				5462	Alpha
				5463	Boolean
				5464	Cache
				5465	Channel
				5466	Class
				5467	ClipPath
				5468	Coder
				5469	Color
				5470	Colorspace
				5471	Command
				5472	Complex
				5473	Compose
				5474	Compress
				5475	Configure
				5476	DataType
				5477	Debug
				5478	Decoration
				5479	Delegate
				5480	Direction
				5481	Dispose
				5482	Distort
				5483	Dither
				5484	Endian
				5485	Evaluate
				5486	FillRule
				5487	Filter
				5488	Font
				5489	Format
				5490	Function
				5491	Gravity
				5492	Intensity
				5493	Intent
				5494	Interlace
				5495	Interpolate
				5496	Kernel
				5497	Layers
				5498	LineCap
				5499	LineJoin
				5500	List
				5501	Locale
				5502	LogEvent
				5503	Log
				5504	Magic
				5505	Method
				5506	Metric
				5507	Mime
				5508	Mode
				5509	Morphology
				5510	Module
				5511	Noise
				5512	Orientation
				5513	PixelIntensity
				5514	Policy
				5515	PolicyDomain
				5516	PolicyRights
				5517	Preview
				5518	Primitive
				5519	QuantumFormat
				5520	Resource
				5521	SparseColor
				5522	Statistic
				5523	Storage
				5524	Stretch
				5525	Style
				5526	Threshold
				5527	Type
				5528	Units
				5529	Validate
				5530	VirtualPixel
				5531	</pre>
				5532
				5533	<p>These lists vary depending on your version of ImageMagick. Use "<code>-list
				5534	list</code>" to get a complete listing of all the "<code>-list</code>" arguments
				5535	available:</p>
				5536
				5537	<pre>
				5538	identify -list list
				5539	</pre>
				5540
				5541	<div style="margin: auto;">
				5542	<h3 class="magick-header"><a id="log"></a>-log <var>string</var></h3>
				5543	</div>
				5544
				5545	<p class="magick-description">Specify format for debug log.</p>
				5546
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5547	<p>This option specifies the format for the log printed when the <a
				5548	href="command-line-options.html#debug">-debug</a> option is active.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5549
				5550	<p>You can display the following components by embedding special format
				5551	characters:</p>
				5552
				5553	<dl class="dl-horizontal">
				5554	<dt>%d</dt><dd>domain</dd>
				5555	<dt>%e</dt><dd>event</dd>
				5556	<dt>%f</dt><dd>function</dd>
				5557	<dt>%l</dt><dd>line</dd>
				5558	<dt>%m</dt><dd>module</dd>
				5559	<dt>%p</dt><dd>process ID</dd>
				5560	<dt>%r</dt><dd>real CPU time</dd>
				5561	<dt>%t</dt><dd>wall clock time</dd>
				5562	<dt>%u</dt><dd>user CPU time</dd>
				5563	<dt>%%</dt><dd>percent sign</dd>
				5564	<dt>\n</dt><dd>newline</dd>
				5565	<dt>\r</dt><dd>carriage return</dd>
				5566	</dl>
				5567
				5568	<p>For example:</p>
				5569
				5570	<pre>
				5571	convert -debug coders -log "%u %m:%l %e" in.gif out.png
				5572	</pre>
				5573
				5574	<p>The default behavior is to print all of the components.</p>
				5575
				5576	<div style="margin: auto;">
				5577	<h3 class="magick-header"><a id="loop"></a>-loop <var>iterations</var></h3>
				5578	</div>
				5579
				5580	<p class="magick-description">add Netscape loop extension to your GIF animation.</p>
				5581
				5582	<p>Set iterations to zero to repeat the animation an infinite number of times,
				5583	otherwise the animation repeats itself up to <var>iterations</var>
				5584	times.</p>
				5585
				5586	<div style="margin: auto;">
				5587	<h3 class="magick-header"><a id="lowlight-color"></a>-lowlight-color <var>color</var></h3>
				5588	</div>
				5589
				5590	<p class="magick-description">when comparing images, de-emphasize pixel differences with this color.</p>
				5591
				5592	<div style="margin: auto;">
				5593	<h3 class="magick-header"><a id="magnify"></a>-magnify</h3>
				5594	</div>
				5595
				5596	<p class="magick-description">double the size of the image with pixel art scaling.</p>
				5597
				5598
				5599	<div style="margin: auto;">
				5600	<h3 class="magick-header"><a id="map"></a>-map <var>type</var></h3>
				5601	</div>
				5602
				5603	<p class="magick-description">Display image using this <var>type</var>.</p>
				5604
				5605	<p>Choose from these <var>Standard Colormap</var> types:</p>
				5606
				5607	<pre>
				5608	best
				5609	default
				5610	gray
				5611	red
				5612	green
				5613	blue
				5614	</pre>
				5615
				5616	<p>The <var>X server</var> must support the <var>Standard
				5617	Colormap</var> you choose, otherwise an error occurs. Use <code>list</code> as
				5618	the type and <code>display</code> searches the list of colormap types in
				5619	<code>top-to-bottom</code> order until one is located. See <var>xstdcmap(1)</var> for one way of creating Standard Colormaps.</p>
				5620
				5621
				5622	<div style="margin: auto;">
				5623	<h3 class="magick-header"><a id="map_stream_"></a>-map <var>components</var></h3>
				5624	</div>
				5625
				5626	<p class="magick-description">pixel map.</p>
				5627
				5628	<p>Here are the valid components of a map:</p>
				5629
				5630	<dl class="dl-horizontal">
				5631	<dt>r</dt><dd> red pixel component</dd>
				5632	<dt>g</dt><dd> green pixel component</dd>
				5633	<dt>b</dt><dd> blue pixel component</dd>
				5634	<dt>a</dt><dd> alpha pixel component (0 is transparent)</dd>
				5635	<dt>o</dt><dd> opacity pixel component (0 is opaque)</dd>
				5636	<dt>i</dt><dd> grayscale intensity pixel component</dd>
				5637	<dt>c</dt><dd> cyan pixel component</dd>
				5638	<dt>m</dt><dd> magenta pixel component</dd>
				5639	<dt>y</dt><dd> yellow pixel component</dd>
				5640	<dt>k</dt><dd> black pixel component</dd>
				5641	<dt>p</dt><dd> pad component (always 0)</dd>
				5642	</dl>
				5643
				5644	<p>You can specify as many of these components as needed in any order (e.g.
				5645	bgr). The components can repeat as well (e.g. rgbr).</p>
				5646
				5647
				5648	<div style="margin: auto;">
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5649	<h3 class="magick-header"><a id="mattecolor"></a>-mattecolor <var>color</var></h3>
				5650	</div>
				5651
				5652	<p class="magick-description">Specify the color to be used with the <a href="command-line-options.html#frame">-frame</a> option.</p>
				5653
				5654	<p>The color is specified using the format described under the <a href="command-line-options.html#fill">-fill</a> option.</p>
				5655
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5656	<p>The default matte color is <code>#BDBDBD</code>, <span
				5657	style="background-color: #bdbdbd;">this shade of gray</span>.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5658
Cristy	f650f4f	2016-04-01 10:53:07 -0400	[diff] [blame]	5659	<p>This is an IMv6 option, use <a href="command-line-options.html#alpha-color">-alpha-color</a> with IMv7.</p>
				5660
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5661	<div style="margin: auto;">
				5662	<h3 class="magick-header"><a id="maximum"></a>-maximum</h3>
				5663	</div>
				5664
				5665	<p class="magick-description">return the maximum intensity of an image sequence.</p>
				5666
				5667	<p>Select the 'maximum' value from all the surrounding pixels. </p>
				5668
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5669	<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]	5670	name. </p>
				5671
				5672	<div style="margin: auto;">
				5673	<h3 class="magick-header"><a id="median"></a>-median <var>geometry</var></h3>
				5674	</div>
				5675
				5676	<p class="magick-description">apply a median filter to the image.</p>
				5677
				5678	<p>Select the 'middle' value from all the surrounding pixels. </p>
				5679
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5680	<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]	5681	name. </p>
				5682
				5683	<div style="margin: auto;">
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	5684	<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]	5685	</div>
				5686
				5687	<p class="magick-description">image noise removal and color reduction/segmentation (e.g. -mean-shift 7x7+10%).</p>
				5688
				5689	<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>
				5690
				5691	<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>
				5692
				5693	<div style="margin: auto;">
				5694	<h3 class="magick-header"><a id="metric"></a>-metric <var>type</var></h3>
				5695	</div>
				5696
				5697	<p class="magick-description">Output to STDERR a measure of the differences between images according to the <var>type</var> given metric.</p>
				5698
				5699	<p>Choose from:</p>
				5700
				5701	<dl class="dl-horizontal">
				5702	<dt>AE</dt><dd> absolute error count, number of different pixels (-fuzz effected)</dd>
				5703	<dt>FUZZ</dt><dd> mean color distance</dd>
				5704	<dt>MAE</dt><dd> mean absolute error (normalized), average channel error distance</dd>
				5705	<dt>MEPP</dt><dd> mean error per pixel (normalized mean error, normalized peak error)</dd>
				5706	<dt>MSE</dt><dd> mean error squared, average of the channel error squared</dd>
				5707	<dt>NCC</dt><dd> normalized cross correlation</dd>
				5708	<dt>PAE</dt><dd> peak absolute (normalized peak absolute)</dd>
Cristy	3b0b58d	2016-11-06 07:40:23 -0500	[diff] [blame]	5709	<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]	5710	<dt>PSNR</dt><dd> peak signal to noise ratio</dd>
				5711	<dt>RMSE</dt><dd> root mean squared (normalized root mean squared)</dd>
				5712	</dl>
				5713
				5714	<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]	5715	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]	5716	only changed by a small amount). Use '<code>PAE</code>' to find the
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5717	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]	5718	'similar', while '<code>MAE</code>' determines the factor needed
				5719	for about half the pixels to be similar. </p>
				5720
				5721	<p>The '<code>MEPP</code>' metric returns three different metrics
				5722	('<code>MAE</code>', '<code>MAE</code>' normalized, and '<code>PAE</code>'
				5723	normalized) from a single comparison run. </p>
				5724
				5725	<p>To print a complete list of metrics, use the <a href="command-line-options.html#list">-list
				5726	metric</a> option.</p>
				5727
				5728
				5729	<div style="margin: auto;">
				5730	<h3 class="magick-header"><a id="minimum"></a>-minimum</h3>
				5731	</div>
				5732
				5733	<p class="magick-description">return the minimum intensity of an image sequence.</p>
				5734
				5735	<p>Select the 'minimal' value from all the surrounding pixels. </p>
				5736
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5737	<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]	5738	name. </p>
				5739
				5740
				5741
				5742	<div style="margin: auto;">
				5743	<h3 class="magick-header"><a id="mode"></a>-mode <var>geometry</var></h3>
				5744	</div>
				5745
				5746	<p class="magick-description">make each pixel the \'predominant color\' of the neighborhood.'</p>
				5747
				5748	<div style="margin: auto;">
				5749	<h3 class="magick-header">-mode <var>value</var></h3>
				5750	</div>
				5751
				5752	<p class="magick-description">Mode of operation.</p>
				5753
				5754	<p>Choose the <var>value</var> from these styles: <code>Frame,
				5755	Unframe, or Concatenate</code></p>
				5756
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5757	<p>Use the <a href="command-line-options.html#list" >-list</a> option with a '<code>Mode</code>' argument
				5758	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]	5759	ImageMagick installation.</p>
				5760
				5761
				5762	<div style="margin: auto;">
				5763	<h3 class="magick-header"><a id="modulate"></a>-modulate <var>brightness</var>[,<var>saturation</var>,<var>hue</var>]</h3>
				5764	</div>
				5765
				5766	<p class="magick-description">Vary the <var>brightness</var>, <var>saturation</var>, and <var>hue</var> of an image.</p>
				5767
				5768	<p>The arguments are given as a percentages of variation. A value of 100 means
				5769	no change, and any missing values are taken to mean 100.</p>
				5770
				5771	<p>The <var>brightness</var> is a multiplier of the overall
				5772	brightness of the image, so 0 means pure black, 50 is half as bright, 200 is
				5773	twice as bright. To invert its meaning <a href="command-line-options.html#negate">-negate</a> the image
				5774	before and after. </p>
				5775
				5776	<p>The <var>saturation</var> controls the amount of color in an
				5777	image. For example, 0 produce a grayscale image, while a large value such as
				5778	200 produce a very colorful, 'cartoonish' color.</p>
				5779
				5780	<p>The <var>hue</var> argument causes a "rotation" of the colors
				5781	within the image by the amount specified. For example, 50 results in
				5782	a counter-clockwise rotation of 90, mapping red shades to purple, and so on.
				5783	A value of either 0 or 200 results in a complete 180 degree rotation of the
				5784	image. Using a value of 300 is a 360 degree rotation resulting in no change to
				5785	the original image. </p>
				5786
				5787	<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]	5788	saturation by 10% and leave the hue unchanged, use <a
				5789	href="command-line-options.html#modulate">-modulate 120,90</a>.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5790
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5791	<p>Use <a href="command-line-options.html#set">-set</a> attribute of '<code
				5792	>option:modulate:colorspace</code>' to specify which colorspace to
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5793	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>
				5794
				5795	<pre>
				5796	convert image.png -set option:modulate:colorspace hsb -modulate 120,90 modulate.png
				5797	</pre>
				5798
				5799	<div style="margin: auto;">
				5800	<h3 class="magick-header"><a id="moments"></a>-moments</h3>
				5801	</div>
				5802
				5803	<p class="magick-description">report image moments and perceptual hash.</p>
				5804
				5805
				5806	<div style="margin: auto;">
				5807	<h3 class="magick-header"><a id="monitor"></a>-monitor</h3>
				5808	</div>
				5809
				5810	<p class="magick-description">monitor progress.</p>
				5811
				5812
				5813	<div style="margin: auto;">
				5814	<h3 class="magick-header"><a id="monochrome"></a>-monochrome</h3>
				5815	</div>
				5816
				5817	<p class="magick-description">transform the image to black and white.</p>
				5818
				5819	<div style="margin: auto;">
				5820	<h3 class="magick-header"><a id="morph"></a>-morph <var>frames</var></h3>
				5821	</div>
				5822
				5823	<p class="magick-description">morphs an image sequence.</p>
				5824
				5825	<p>Both the image pixels and size are linearly interpolated to give the
				5826	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]	5827	in the current image list. The added images are the equivalent of a <a
				5828	href="command-line-options.html#blend">-blend</a> composition. The <var>frames</var>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5829	argument determine how many images to interpolate between each image. </p>
				5830
				5831
				5832	<div style="margin: auto;">
				5833	<h3 class="magick-header"><a id="morphology"></a>-morphology</h3>
				5834	<h3 class="magick-header">-morphology <var>method</var> <var>kernel</var></h3>
				5835	</div>
				5836
				5837	<p class="magick-description">apply a morphology method to the image.</p>
				5838
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5839	<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]	5840	href="https://www.imagemagick.org/Usage/morphology/" >IM Usage Examples,
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5841	Morphology</a>. </p>
				5842
				5843
				5844	<div style="margin: auto;">
				5845	<h3 class="magick-header"><a id="mosaic"></a>-mosaic</h3>
				5846	</div>
				5847
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5848	<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]	5849
				5850
				5851	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5852	<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]	5853	</div>
				5854
				5855	<p class="magick-description">simulate motion blur.</p>
				5856
				5857	<p>Blur with the given radius, standard deviation (sigma), and angle. The
				5858	angle given is the angle toward which the image is blurred. That is the
				5859	direction people would consider the object is coming from. </p>
				5860
				5861	<p>Note that the blur is not uniform distribution, giving the motion a
				5862	definite sense of direction of movement. </p>
				5863
				5864	<p>The <a href="command-line-options.html#virtual-pixel">-virtual-pixel</a> setting will determine how
				5865	pixels which are outside the image proper are blurred into the final result.
				5866	</p>
				5867
				5868	<div style="margin: auto;">
				5869	<h3 class="magick-header"><a id="name"></a>-name</h3>
				5870	</div>
				5871
				5872	<p class="magick-description">name an image.</p>
				5873	<div style="margin: auto;">
				5874	<h3 class="magick-header"><a id="negate"></a>-negate</h3>
				5875	</div>
				5876
				5877	<p class="magick-description">replace each pixel with its complementary color.</p>
				5878
				5879	<p>The red, green, and blue intensities of an image are negated. White becomes
				5880	black, yellow becomes blue, etc. Use <a href="command-line-options.html#negate">+negate</a> to only
				5881	negate the grayscale pixels of the image.</p>
				5882
				5883	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5884	<h3 class="magick-header"><a id="noise"></a>-noise <var>geometry</var><br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5885	+noise <var>type</var></h3>
				5886	</div>
				5887
				5888	<p class="magick-description">Add or reduce noise in an image.</p>
				5889
				5890	<p>The principal function of noise peak elimination filter is to smooth the
				5891	objects within an image without losing edge information and without creating
				5892	undesired structures. The central idea of the algorithm is to replace a pixel
				5893	with its next neighbor in value within a pixel window, if this pixel has been
				5894	found to be noise. A pixel is defined as noise if and only if this pixel is
				5895	a maximum or minimum within the pixel window.</p>
				5896
				5897	<p>Use <code><a href="command-line-options.html#noise">-noise</a> <var>radius</var></code> to
				5898	specify the width of the neighborhood when reducing noise. This is equivalent
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5899	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]	5900	which should be used in preference.</p>
				5901
				5902	<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
				5903	types:</p>
				5904
				5905	<pre>
				5906	Gaussian
				5907	Impulse
				5908	Laplacian
				5909	Multiplicative
				5910	Poisson
				5911	Random
				5912	Uniform
				5913	</pre>
				5914
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5915	<p>The amount of noise added can be controlled by the <code><a
				5916	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]	5917	equivalent to 1.0, or a maximum noise addition.</p>
				5918
				5919	<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>
				5920
				5921	<p>To print a complete list of noises, use the <a href="command-line-options.html#list">-list noise</a> option.</p>
				5922
				5923	<p>Also see the <a href="command-line-options.html#evaluate">-evaluate</a> noise functions that allows
				5924	the use of a controlling value to specify the amount of noise that should be
				5925	added to an image. </p>
				5926
				5927
				5928	<div style="margin: auto;">
				5929	<h3 class="magick-header"><a id="normalize"></a>-normalize</h3>
				5930	</div>
				5931
				5932	<p class="magick-description">Increase the contrast in an image by <var>stretching</var> the range of intensity values.</p>
				5933
				5934	<p>The intensity values are stretched to cover the entire range of possible
				5935	values. While doing so, black-out at most <var>2%</var> of the pixels and
				5936	white-out at most <var>1%</var> of the pixels.</p>
				5937
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5938	<p>Note that as of ImageMagick 6.4.7-0, <a href="command-line-options.html#normalize" >-normalize</a>
				5939	is equivalent to <a href="command-line-options.html#contrast-stretch" >-contrast-stretch 2%x1%</a>.
				5940	(Before this version, it was equivalent to <a href="command-line-options.html#contrast-stretch"
				5941	>-contrast-stretch 2%x99%</a>).</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	5942
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	5943	<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]	5944	preserve color integrity, when the default <a href="command-line-options.html#channel" >+channel</a>
				5945	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]	5946	setting will normalize the RGB channels independently.</p>
				5947
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5948	<p>See <a href="command-line-options.html#contrast-stretch" >-contrast-stretch</a> for more details.
				5949	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]	5950	that is better suited to mathematically generated images. </p>
				5951
				5952	<p>This operator is under review for re-development. </p>
				5953
				5954
				5955	<div style="margin: auto;">
				5956	<h3 class="magick-header"><a id="opaque"></a>-opaque <var>color</var></h3>
				5957	</div>
				5958
				5959	<p class="magick-description">change this color to the fill color within the image.</p>
				5960
				5961	<p>The <var>color</var> argument is defined using the format
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	5962	described under the <a href="command-line-options.html#fill" >-fill</a> option. The <a href="command-line-options.html#fuzz"
				5963	>-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]	5964	given.</p>
				5965
				5966	<p>Use <a href="command-line-options.html#opaque">+opaque</a> to paint any pixel that does not match
				5967	the target color. </p>
				5968
				5969	<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]	5970	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]	5971	transparency rather than the current <a href="command-line-options.html#fill">-fill</a> color setting.
				5972	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]	5973	channel enabled, as per "<code><a href="command-line-options.html#alpha" >-alpha</a> set</code>", for
				5974	the new transparent colors, and does not require you to modify the <a
				5975	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]	5976
				5977
				5978	<div style="margin: auto;">
				5979	<h3 class="magick-header"><a id="ordered-dither"></a>-ordered-dither <var>threshold_map</var>{,<var>level</var>...}</h3>
				5980	</div>
				5981
				5982	<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
				5983	given number of <var>levels</var> per color channel.</p>
				5984
				5985	<p>You can choose from these standard threshold maps:</p>
				5986
				5987	<pre class="pre-scrollable">
				5988	threshold 1x1 Threshold 1x1 (non-dither)
				5989	checks 2x1 Checkerboard 2x1 (dither)
				5990	o2x2 2x2 Ordered 2x2 (dispersed)
				5991	o3x3 3x3 Ordered 3x3 (dispersed)
				5992	o4x4 4x4 Ordered 4x4 (dispersed)
				5993	o8x8 8x8 Ordered 8x8 (dispersed)
				5994	h3x4a 4x1 Halftone 4x4 (angled)
				5995	h6x6a 6x1 Halftone 6x6 (angled)
				5996	h8x8a 8x1 Halftone 8x8 (angled)
				5997	h3x4o Halftone 4x4 (orthogonal)
				5998	h6x6o Halftone 6x6 (orthogonal)
				5999	h8x8o Halftone 8x8 (orthogonal)
				6000	h36x16o Halftone 16x16 (orthogonal)
				6001	c5x5b c5x5 Circles 5x5 (black)
				6002	c5x5w Circles 5x5 (white)
				6003	c6x6b c6x6 Circles 6x6 (black)
				6004	c6x6w Circles 6x6 (white)
				6005	c7x7b c7x7 Circles 7x7 (black)
				6006	c7x7w Circles 7x7 (white)
				6007	</pre>
				6008
				6009	<p> The <code>threshold</code> generated a simple 50% threshold of the image.
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6010	This could be used with <var >level</var> to do the equivalent of <a
				6011	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]	6012	</p>
				6013
				6014	<p>The <code>checks</code> pattern produces a 3 level checkerboard dither
				6015	pattern. That is a grayscale will become a pattern of solid black, solid
				6016	white, and mid-tone colors into a checkerboard pattern of black and white.
				6017	</p>
				6018
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6019	<p>You can define your own <var >threshold map</var> for ordered
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6020	dithering and halftoning your images, in either personal or system
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6021	<code>thresholds.xml</code> XML file. See <a href="resources.html" >Resources</a>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6022	for more details of configuration files. </p>
				6023
				6024	<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]	6025	<a href="command-line-options.html#list" >-list threshold</a> option.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6026
				6027	<p>Note that at this time the same threshold dithering map is used for all
				6028	color channels, no attempt is made to offset or rotate the map for different
				6029	channels is made, to create an offset printing effect. Also as the maps are
				6030	simple threshold levels, the halftone and circle maps will create incomplete
				6031	circles along the edges of a colored area. Also all the effects are purely
				6032	on/off boolean effects, without anti-aliasing to make the circles smooth
				6033	looking. Large dots can be made to look better with a small amount of blurring
				6034	after being created. </p>
				6035
				6036
				6037	<div style="margin: auto;">
				6038	<h3 class="magick-header"><a id="orient"></a>-orient <var>image orientation</var></h3>
				6039	</div>
				6040
				6041	<p class="magick-description">specify orientation of a digital camera image.</p>
				6042
				6043	<p>Choose from these orientations:</p>
				6044
				6045	<pre>
				6046	bottom-left right-top
				6047	bottom-right top-left
				6048	left-bottom top-right
				6049	left-top undefined
				6050	right-bottom
				6051	</pre>
				6052
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6053	<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]	6054	orientation</a> option.</p>
				6055
				6056
				6057	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6058	<h3 class="magick-header"><a id="page"></a>-page <var>geometry</var><br/>
				6059	-page <var>media</var>[<var>offset</var>][{<var>^!<></var>}]<br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6060	+page
				6061	</h3>
				6062	</div>
				6063
				6064	<p class="magick-description">Set the size and location of an image on the larger virtual canvas.</p>
				6065
				6066	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				6067
				6068	<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]	6069	<var>geometry</var> arguments (e.g. <a
				6070	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]	6071
				6072	<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.
				6073	The choices for a PostScript page are:</p>
				6074
				6075	<dl class="dl-horizontal">
				6076	<dt> 11x17 </dt> <dd> 792 x 1224</dd>
				6077	<dt> Ledger </dt> <dd> 1224 x 792</dd>
				6078	<dt> Legal </dt> <dd> 612 x 1008</dd>
				6079	<dt> Letter </dt> <dd> 612 x 792</dd>
				6080	<dt> LetterSmall</dt> <dd> 612 x 792</dd>
				6081	<dt> ArchE </dt> <dd> 2592 x 3456</dd>
				6082	<dt> ArchD </dt> <dd> 1728 x 2592</dd>
				6083	<dt> ArchC </dt> <dd> 1296 x 1728</dd>
				6084	<dt> ArchB </dt> <dd> 864 x 1296</dd>
				6085	<dt> ArchA </dt> <dd> 648 x 864</dd>
				6086	<dt> A0 </dt> <dd> 2380 x 3368</dd>
				6087	<dt> A1 </dt> <dd> 1684 x 2380</dd>
				6088	<dt> A2 </dt> <dd> 1190 x 1684</dd>
				6089	<dt> A3 </dt> <dd> 842 x 1190</dd>
				6090	<dt> A4 </dt> <dd> 595 x 842</dd>
				6091	<dt> A4Small </dt> <dd> 595 x 842</dd>
				6092	<dt> A5 </dt> <dd> 421 x 595</dd>
				6093	<dt> A6 </dt> <dd> 297 x 421</dd>
				6094	<dt> A7 </dt> <dd> 210 x 297</dd>
				6095	<dt> A8 </dt> <dd> 148 x 210</dd>
				6096	<dt> A9 </dt> <dd> 105 x 148</dd>
				6097	<dt> A10 </dt> <dd> 74 x 105</dd>
				6098	<dt> B0 </dt> <dd> 2836 x 4008</dd>
				6099	<dt> B1 </dt> <dd> 2004 x 2836</dd>
				6100	<dt> B2 </dt> <dd> 1418 x 2004</dd>
				6101	<dt> B3 </dt> <dd> 1002 x 1418</dd>
				6102	<dt> B4 </dt> <dd> 709 x 1002</dd>
				6103	<dt> B5 </dt> <dd> 501 x 709</dd>
				6104	<dt> C0 </dt> <dd> 2600 x 3677</dd>
				6105	<dt> C1 </dt> <dd> 1837 x 2600</dd>
				6106	<dt> C2 </dt> <dd> 1298 x 1837</dd>
				6107	<dt> C3 </dt> <dd> 918 x 1298</dd>
				6108	<dt> C4 </dt> <dd> 649 x 918</dd>
				6109	<dt> C5 </dt> <dd> 459 x 649</dd>
				6110	<dt> C6 </dt> <dd> 323 x 459</dd>
				6111	<dt> Flsa </dt> <dd> 612 x 936</dd>
				6112	<dt> Flse </dt> <dd> 612 x 936</dd>
				6113	<dt> HalfLetter </dt> <dd> 396 x 612</dd>
				6114	</dl>
				6115
				6116	<p>This option is also used to place subimages when writing to a multi-image
				6117	format that supports offsets, such as GIF89 and MNG. When used for this
				6118	purpose the offsets are always measured from the top left corner of the canvas
				6119	and are not affected by the <a href="command-line-options.html#gravity">-gravity</a> option. To
				6120	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
				6121	file, a <a href="command-line-options.html#page">-page</a> option appearing ahead of the first image in
				6122	the sequence with nonzero width and height defines the width and height values
				6123	that are written in the <code>MHDR</code> chunk. Otherwise, the MNG width and
				6124	height are computed from the bounding box that contains all images in the
				6125	sequence. When writing a GIF89 file, only the bounding box method is used to
				6126	determine its dimensions.</p>
				6127
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6128	<p>For a PostScript page, the image is sized as in <a
				6129	href="command-line-options.html#geometry">-geometry</a> but positioned relative to the <var>lower
				6130	left-hand corner</var> of the page by {+-}<code>x</code><var>offset</var>{+-}<code>y</code> <var>offset</var>. Use <a
				6131	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]	6132	page. If the image size exceeds the PostScript page, it is reduced to fit the
				6133	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
				6134	corner of the page, unless the <a href="command-line-options.html#gravity">-gravity</a> option is
				6135	present with a value other than <var>NorthWest</var>.</p>
				6136
				6137	<p>The default page dimensions for a TEXT image is 612x792.</p>
				6138
				6139	<p>This option is used in concert with <a href="command-line-options.html#density">-density</a>.</p>
				6140
				6141	<p>Use <a href="command-line-options.html#page">+page</a> to remove the page settings for an image.</p>
				6142
				6143	<div style="margin: auto;">
				6144	<h3 class="magick-header"><a id="paint"></a>-paint <var>radius</var></h3>
				6145	</div>
				6146
				6147	<p class="magick-description">simulate an oil painting.</p>
				6148
				6149	<p>Each pixel is replaced by the most frequent color in a circular
				6150	neighborhood whose width is specified with <var>radius</var>.</p>
				6151
				6152	<div style="margin: auto;">
				6153	<h3 class="magick-header"><a id="path"></a>-path <var>path</var></h3></div>
				6154
				6155	<p class="magick-description">write images to this path on disk.</p>
				6156
				6157	<div style="margin: auto;">
				6158	<h3 class="magick-header"><a id="pause_animate_"></a>-pause <var>seconds</var></h3>
				6159	</div>
				6160
				6161	<p class="magick-description">Pause between animation loops</p>
				6162
				6163	<p>Pause for the specified number of seconds before repeating the animation.</p>
				6164
				6165	<div style="margin: auto;">
				6166	<h3 class="magick-header"><a id="pause_import_"></a>-pause <var>seconds</var></h3>
				6167	</div>
				6168
				6169	<p class="magick-description">Pause between snapshots.</p>
				6170
				6171	<p>Pause for the specified number of seconds before taking the next snapshot.</p>
				6172
				6173	<div style="margin: auto;">
				6174	<h3 class="magick-header"><a id="perceptible"></a>-perceptible <var>epsilon</var></h3>
				6175	</div>
				6176
				6177	<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>
				6178
				6179	<div style="margin: auto;">
				6180	<h3 class="magick-header"><a id="ping"></a>-ping</h3>
				6181	</div>
				6182
				6183	<p class="magick-description">efficiently determine image characteristics.</p>
				6184
				6185	<div style="margin: auto;">
				6186	<h3 class="magick-header"><a id="pointsize"></a>-pointsize <var>value</var></h3>
				6187	</div>
				6188
				6189	<p class="magick-description">pointsize of the PostScript, OPTION1, or TrueType font.</p>
				6190
				6191	<div style="margin: auto;">
				6192	<h3 class="magick-header"><a id="polaroid"></a>-polaroid <var>angle</var></h3>
				6193	</div>
				6194
				6195	<p class="magick-description">simulate a Polaroid picture.</p>
				6196
				6197	<p>Use <code>+polaroid</code> to rotate the image at a random angle between -15 and +15 degrees.</p>
				6198
				6199	<div style="margin: auto;">
				6200	<h3 class="magick-header"><a id="poly"></a>-poly <var>"wt,exp ..."</var></h3>
				6201	</div>
				6202
				6203	<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>
				6204
				6205	<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>
				6206
				6207	<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>
				6208
				6209	<p>The format is: <var>output = wt1image1^exp1 + wt2image2^exp2 </var>...</p>
				6210
				6211	<p>Some simple uses are:</p>
				6212	<ul>
				6213	<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>
				6214	<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>
				6215	</ul>
				6216
				6217	<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>
				6218
				6219	<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>
				6220
				6221
				6222	<div style="margin: auto;">
				6223	<h3 class="magick-header"><a id="posterize"></a>-posterize <var>levels</var></h3>
				6224	</div>
				6225
				6226	<p class="magick-description">reduce the image to a limited number of color levels per channel.</p>
				6227
				6228	<p>Very low values of <var>levels</var>, e.g., 2, 3, 4, have the most
				6229	visible effect.</p>
				6230
				6231	<div style="margin: auto;">
				6232	<h3 class="magick-header"><a id="precision"></a>-precision <var>value</var></h3>
				6233	</div>
				6234
				6235	<p class="magick-description">set the maximum number of significant digits to be printed.</p>
				6236
				6237	<div style="margin: auto;">
				6238	<h3 class="magick-header"><a id="preview"></a>-preview <var>type</var></h3>
				6239	</div>
				6240
				6241	<p class="magick-description">image preview type.</p>
				6242
				6243	<p>Use this option to affect the preview operation of an image (e.g.
				6244	<code>convert file.png -preview Gamma Preview:gamma.png</code>). Choose from
				6245	these previews:</p>
				6246
				6247	<pre class="pre-scrollable">
				6248	AddNoise
				6249	Blur
				6250	Brightness
				6251	Charcoal
				6252	Despeckle
				6253	Dull
				6254	EdgeDetect
				6255	Gamma
				6256	Grayscale
				6257	Hue
				6258	Implode
				6259	JPEG
				6260	OilPaint
				6261	Quantize
				6262	Raise
				6263	ReduceNoise
				6264	Roll
				6265	Rotate
				6266	Saturation
				6267	Segment
				6268	Shade
				6269	Sharpen
				6270	Shear
				6271	Solarize
				6272	Spiff
				6273	Spread
				6274	Swirl
				6275	Threshold
				6276	Wave
				6277	</pre>
				6278
				6279	<p>To print a complete list of previews, use the <a href="command-line-options.html#list">-list preview</a> option.</p>
				6280
				6281	<p>The default preview is <code>JPEG</code>.</p>
				6282
				6283	<div style="margin: auto;">
				6284	<h3 class="magick-header"><a id="print"></a>-print <var>string</var></h3>
				6285	</div>
				6286
				6287	<p class="magick-description">interpret string and print to console.</p>
				6288
				6289	<div style="margin: auto;">
				6290	<h3 class="magick-header"><a id="process"></a>-process <var>command</var></h3>
				6291	</div>
				6292
				6293	<p class="magick-description">process the image with a custom image filter.</p>
				6294
				6295	<p>The command arguments has the form <code>"module arg1 arg2 arg3 ...
				6296	argN"</code> where <code>module</code> is the name of the module to invoke (e.g.
				6297	"Analyze") and arg1 arg2 arg3 ... argN are an arbitrary number of arguments to
				6298	pass to the process module.</p>
				6299
				6300	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6301	<h3 class="magick-header"><a id="profile"></a>-profile <var>filename</var><br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6302	+profile <var>profile_name</var></h3>
				6303	</div>
				6304
				6305	<p class="magick-description">Manage ICM, IPTC, or generic profiles in an image.</p>
				6306
				6307	<p>Using <a href="command-line-options.html#profile">-profile</a> <var>filename</var> adds an
				6308	ICM (ICC color management), IPTC (newswire information), or a generic profile
				6309	to the image.</p>
				6310
				6311	<p>Use <a href="command-line-options.html#profile">+profile <var>profile_name</var></a> to
				6312	remove the indicated profile. ImageMagick uses standard filename globbing, so
				6313	wildcard expressions may be used to remove more than one profile. Here we
				6314	remove all profiles from the image except for the XMP profile: <code>+profile
				6315	"!xmp,*"</code>. </p>
				6316
				6317	<p>Use <code>identify -verbose</code> to find out which profiles are in the
				6318	image file. Use <a href="command-line-options.html#strip">-strip</a> to remove all profiles (and
				6319	comments).</p>
				6320
				6321	<p>To extract a profile, the <a href="command-line-options.html#profile">-profile</a> option is not
				6322	used. Instead, simply write the file to an image format such as <var>APP1, 8BIM, ICM,</var> or <var>IPTC</var>.</p>
				6323
				6324	<p>For example, to extract the Exif data (which is stored in JPEG files in the
				6325	<var>APP1</var> profile), use.</p>
				6326
				6327	<pre>
				6328	convert cockatoo.jpg profile.exif
				6329	</pre>
				6330
				6331	<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]	6332	original image already has an included profile. Also, keep in mind that <a
				6333	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]	6334	therefore a conversion is made each time it is encountered, in order, in the
				6335	command-line. For instance, in the following example, if the original image is
				6336	CMYK with profile, a CMYK-CMYK-RGB conversion results.</p>
				6337
				6338	<pre>
				6339	convert CMYK.tif -profile "CMYK.icc" -profile "RGB.icc" RGB.tiff
				6340	</pre>
				6341
				6342	<p>Furthermore, since ICC profiles are not necessarily symmetric, extra
				6343	conversion steps can yield unwanted results. CMYK profiles are often very
				6344	asymmetric since they involve 3−>4 and 4−>3 channel mapping.
				6345	</p>
				6346
				6347	<div style="margin: auto;">
				6348	<h3 class="magick-header"><a id="quality"></a>-quality <var>value</var></h3>
				6349	</div>
				6350
				6351	<p class="magick-description">JPEG/MIFF/PNG compression level.</p>
				6352
				6353	<p>For the JPEG and MPEG image formats, quality is 1 (lowest image quality and
				6354	highest compression) to 100 (best quality but least effective compression).
				6355	The default is to use the estimated quality of your input image if it can
				6356	be determined, otherwise 92. When the quality is greater than 90, then the
				6357	chroma channels are not downsampled.
				6358	Use the <a href="command-line-options.html#sampling-factor">-sampling-factor</a> option to specify the
				6359	factors for chroma downsampling.</p>
				6360
				6361	<p>For the JPEG-2000 image format, quality is mapped using a non-linear
				6362	equation to the compression ratio required by the Jasper library. This
				6363	non-linear equation is intended to loosely approximate the quality provided by
				6364	the JPEG v1 format. The default quality value 100, a request for non-lossy
				6365	compression. A quality of 75 results in a request for 16:1 compression.</p>
				6366
				6367	<p>For the MNG and PNG image formats, the quality value sets the zlib
				6368	compression level (quality / 10) and filter-type (quality % 10). The default
				6369	PNG "quality" is 75, which means compression level 7 with adaptive PNG
				6370	filtering, unless the image has a color map, in which case it means
				6371	compression level 7 with no PNG filtering.</p>
				6372
				6373	<p>For compression level 0 (quality value less than 10), the Huffman-only
				6374	strategy is used, which is fastest but not necessarily the worst
				6375	compression.</p>
				6376
				6377	<p>If filter-type is 4 or less, the specified PNG filter-type is used for
				6378	all scanlines:</p>
				6379
				6380	<dl class="dl-horizontal">
				6381	<dt>0</dt><dd>none</dd>
				6382	<dt>1</dt><dd>sub</dd>
				6383	<dt>2</dt><dd>up</dd>
				6384	<dt>3</dt><dd>average</dd>
				6385	<dt>4</dt><dd>Paeth</dd>
				6386	</dl>
				6387
				6388	<p>If filter-type is 5, adaptive filtering is used when quality is greater
				6389	than 50 and the image does not have a color map, otherwise no filtering is
				6390	used.</p>
				6391
				6392	<p>If filter-type is 6, adaptive filtering
				6393	with <var>minimum-sum-of-absolute-values</var> is used.</p>
				6394
				6395	<p>Only if the output is MNG, if filter-type is 7, the LOCO color
				6396	transformation (intrapixel differencing) and adaptive filtering
				6397	with <var>minimum-sum-of-absolute-values</var> are used.</p>
				6398
				6399	<p>If the filter-type is 8 the zlib Z_RLE compression strategy (or the
				6400	Z_HUFFMAN_ONLY strategy, when compression level is 0) is used with
				6401	adaptive PNG filtering.</p>
				6402
				6403	<p>If the filter-type is 9 the zlib Z_RLE compression strategy (or the
				6404	Z_HUFFMAN_ONLY strategy, when compression level is 0) is used with
				6405	no PNG filtering.</p>
				6406
				6407	<p>The quality setting has no effect on the appearance or signature of PNG
				6408	and MNG images, since the compression is always lossless.</p>
				6409
				6410	<p>Not all combinations of compression level, strategy, and PNG filter type
				6411	can be obtained using the -quality option. For more precise control,
				6412	you can use the PNG:compression-level=N, PNG:compression-strategy=N, and
				6413	PNG:compression-filter=N defines, respectively, instead.
				6414	See <a href="command-line-options.html#define">-define</a>. Values from the defines take precedence
				6415	over values from the -quality option.</p>
				6416
				6417	<p>For further information, see
				6418	the <a href="http://www.w3.org/pub/WWW/TR">PNG</a> specification.</p>
				6419
				6420	<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>
				6421
				6422	<p>For the BPG image format, quality/2 is the actual BPG compression level (range from 0 to 51).</p>
				6423
				6424	<div style="margin: auto;">
				6425	<h3 class="magick-header"><a id="quantize"></a>-quantize <var>colorspace</var></h3>
				6426	</div>
				6427
				6428	<p class="magick-description">reduce colors using this colorspace.</p>
				6429
				6430	<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]	6431	of colors needed by an image (for later dithering) by operators such as <a
				6432	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]	6433	automatically when saving images to color-limited image file formats, such as
				6434	GIF, and PNG8.</p>
				6435
				6436
				6437	<div style="margin: auto;">
				6438	<h3 class="magick-header"><a id="quiet"></a>-quiet</h3>
				6439	</div>
				6440
				6441	<p class="magick-description">suppress all warning messages. Error messages are still reported.</p>
				6442
				6443	<div style="margin: auto;">
				6444	<h3 class="magick-header"><a id="radial-blur"></a>-radial-blur <var>angle</var></h3>
				6445	</div>
				6446
				6447	<p class="magick-description">Blur around the center of the image.</p>
				6448
				6449	<p>Note that this is actually a rotational blur rather than a radial and as
				6450	such actually mis-named. </p>
				6451
				6452	<p>The <a href="command-line-options.html#virtual-pixel">-virtual-pixel</a> setting will determine how
				6453	pixels which are outside the image proper are blurred into the final result.
				6454	</p>
				6455
				6456
				6457	<div style="margin: auto;">
				6458	<h3 class="magick-header"><a id="raise"></a>-raise <var>thickness</var></h3>
				6459	</div>
				6460
				6461	<p class="magick-description">Lighten or darken image edges.</p>
				6462
				6463	<p>This will create a 3-D effect. Use <a href="command-line-options.html#raise">-raise</a> to create
				6464	a raised effect, otherwise use <a href="command-line-options.html#raise">+raise</a>. </p>
				6465
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6466	<p>Unlike the similar <a href="command-line-options.html#frame">-frame</a> option, <a
				6467	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]	6468
				6469	<div style="margin: auto;">
				6470	<h3 class="magick-header"><a id="random-threshold"></a>-random-threshold <var>low</var>x<var>high</var></h3>
				6471	</div>
				6472
				6473	<p class="magick-description">Apply a random threshold to the image.</p>
				6474
				6475	<div style="margin: auto;">
Cristy	e077971	2016-07-30 17:25:22 -0400	[diff] [blame]	6476	<h3 class="magick-header"><a id="read-mask"></a>-read-mask
				6477	<var>filename</var></h3>
				6478	</div>
				6479
				6480	<p class="magick-description">Prevent updates to image pixels specified by the mask.</p>
				6481
				6482	<p>This the same as using a mask used for composite masking operations, with
				6483	grayscale values causing blended updates of the image the mask is attached to.
				6484	</p>
				6485
				6486	<p>Use <a href="command-line-options.html#read-mask">+read-mask</a> to remove the mask from images.</p>
				6487
				6488	<p>Also see <a href="command-line-options.html#clip-mask">-clip-mask</a> which work in the same way,
				6489	but with strict boolean masking. </p>
				6490
				6491	<div style="margin: auto;">
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6492	<h3 class="magick-header"><a id="red-primary"></a>-red-primary <var>x,y</var></h3>
				6493	</div>
				6494
				6495	<p class="magick-description">Set the red chromaticity primary point.</p>
				6496
				6497	<div style="margin: auto;">
				6498	<h3 class="magick-header"><a id="regard-warnings"></a>-regard-warnings</h3>
				6499	</div>
				6500
				6501	<p class="magick-description">Pay attention to warning messages.</p>
				6502
				6503	<p>This option causes some warnings in some image formats to be treated
				6504	as errors. </p>
				6505
				6506	<div style="margin: auto;">
				6507	<h3 class="magick-header"><a id="remap"></a>-remap <var>filename</var></h3>
				6508	</div>
				6509
				6510	<p class="magick-description">Reduce the number of colors in an image to the colors used by this image.</p>
				6511
				6512	<p>If the <a href="command-line-options.html#dither">-dither</a> setting is enabled (the default) then
				6513	the given colors are dithered over the image as necessary, otherwise the closest
				6514	color (in RGB colorspace) is selected to replace that pixel in the image. </p>
				6515
				6516	<p>As a side effect of applying a <a href="command-line-options.html#remap">-remap</a> of colors across all
				6517	images in the current image sequence, all the images will have the same color
				6518	table. That means that when saved to a file format such as GIF, it will use
				6519	that color table as a single common or global color table, for all the images,
				6520	without requiring extra local color tables. </p>
				6521
				6522	<p>Use <a href="command-line-options.html#remap">+remap</a> to reduce all images in the current image
				6523	sequence to use a common color map over all the images. This equivalent to
				6524	appending all the images together (without extra background colors) and color
				6525	reducing those images using <a href="command-line-options.html#colors">-colors</a> with a 256 color
				6526	limit, then <a href="command-line-options.html#remap">-remap</a> those colors over the original list of
				6527	images. This ensures all the images follow a single color map. </p>
				6528
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6529	<p>If the number of colors over all the images is less than 256, then <a
				6530	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]	6531	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]	6532	of a global color table. This recommended after using either <a
				6533	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]	6534	reduce the number of colors in an animated image sequence. </p>
				6535
				6536	<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>
				6537
				6538	<div style="margin: auto;">
				6539	<h3 class="magick-header"><a id="region"></a>-region <var>geometry</var></h3>
				6540	</div>
				6541
				6542	<p class="magick-description">Set a region in which subsequent operations apply.</p>
				6543
				6544	<p>The <var>x</var> and <var>y</var> offsets are treated
				6545	in the same manner as in <a href="command-line-options.html#crop">-crop</a>.</p>
				6546
				6547	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				6548
				6549	<p>Use <code>+region</code> to remove any previously set regions.</p>
				6550
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6551	<div style="margin: auto;">
				6552	<h3 class="magick-header"><a id="remote"></a>-remote</h3>
				6553	</div>
				6554
				6555	<p class="magick-description">perform a remote operation.</p>
				6556
				6557	<p>The only command recognized is the name of an image file to load.</p>
				6558
				6559	<p>If you have more than one <a href="display.html">display</a> application
				6560	running simultaneously, use the <a href="command-line-options.html#window"> window</a> option to
				6561	specify which application to control.</p>
				6562
				6563	<div style="margin: auto;">
				6564	<h3 class="magick-header"><a id="render"></a>-render</h3>
				6565	</div>
				6566
				6567	<p class="magick-description">render vector operations.</p>
				6568
				6569	<p>Use <a href="command-line-options.html#render">+render</a> to turn off rendering vector operations.
				6570	This useful when saving the result to vector formats such as MVG or SVG.</p>
				6571
				6572	<div style="margin: auto;">
				6573	<h3 class="magick-header"><a id="repage"></a>-repage <var>geometry</var></h3>
				6574	</div>
				6575
				6576	<p class="magick-description">Adjust the canvas and offset information of the image.</p>
				6577
				6578	<p>This option is like <a href="command-line-options.html#page">-page</a> but acts as an image operator
				6579	rather than a setting. You can separately set the canvas size or the offset
				6580	of the image on that canvas by only providing those components. </p>
				6581
				6582	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				6583
				6584	<p>If a <code>!</code> flag is given the offset given is added to the existing
				6585	offset to move the image relative to its previous position. This useful for
				6586	animation sequences. </p>
				6587
				6588	<p>A given a canvas size of zero such as '<code>0x0</code>' forces it to
				6589	recalculate the canvas size so the image (at its current offset) will appear
				6590	completely on that canvas (unless it has a negative offset).</p>
				6591
				6592	<p>Use <a href="command-line-options.html#repage">+repage</a> to completely remove/reset the virtual
				6593	canvas meta-data from the images. </p>
				6594
				6595	<p>The <a href="command-line-options.html#set">-set</a> '<code>page</code>' option can be used to
				6596	directly assign virtual canvas meta-data. </p>
				6597
				6598
				6599	<div style="margin: auto;">
				6600	<h3 class="magick-header"><a id="resample"></a>-resample <var>horizontal</var>x<var>vertical</var></h3>
				6601	</div>
				6602
				6603	<p class="magick-description">Resample image to specified horizontal and vertical resolution.</p>
				6604
				6605	<p>Resize the image so that its rendered size remains the same as the original
				6606	at the specified target resolution. For example, if a 300 DPI image renders at
				6607	3 inches by 2 inches on a 300 DPI device, when the image has been resampled to
				6608	72 DPI, it will render at 3 inches by 2 inches on a 72 DPI device. Note that
				6609	only a small number of image formats (e.g. JPEG, PNG, and TIFF) are capable of
				6610	storing the image resolution. For formats which do not support an image
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6611	resolution, the original resolution of the image must be specified via <a
				6612	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]	6613	resample resolution.</p>
				6614
				6615	<p>Note that Photoshop stores and obtains image resolution from a proprietary
				6616	embedded profile. If this profile exists in the image, then Photoshop will
				6617	continue to treat the image using its former resolution, ignoring the image
				6618	resolution specified in the standard file header.</p>
				6619
				6620	<div style="margin: auto;">
				6621	<h3 class="magick-header"><a id="resize"></a>-resize <var>geometry</var></h3>
				6622	</div>
				6623
				6624	<p class="magick-description">Resize an image.</p>
				6625
				6626	<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
				6627	ignored, and the <a href="command-line-options.html#gravity">-gravity</a> option has no effect.</p>
				6628
				6629	<p>If the <a href="command-line-options.html#filter">-filter</a> option
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6630	or <code>-define filter:option=value</code> precedes the <a
				6631	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]	6632	filter.</p>
				6633
				6634	<p>Many image processing algorithms assume your image is in a linear-light
				6635	coding. If your image is gamma-corrected, you can remove the nonlinear gamma
				6636	correction, apply the transform, then restore it like this:</p>
				6637
				6638	<pre>
				6639	convert portrait.jpg -gamma .45455 -resize 25% -gamma 2.2 \
				6640	-quality 92 passport.jpg
				6641	</pre>
				6642
				6643	<div style="margin: auto;">
				6644	<h3 class="magick-header"><a id="respect-parentheses"></a>-respect-parentheses</h3>
				6645	</div>
				6646
				6647	<p class="magick-description">settings remain in effect until parenthesis boundary.</p>
				6648
				6649	<div style="margin: auto;">
				6650	<h3 class="magick-header"><a id="reverse"></a>-reverse</h3>
				6651	</div>
				6652
				6653	<p class="magick-description">Reverse the order of images in the current image list.</p>
				6654
				6655
				6656	<div style="margin: auto;">
				6657	<h3 class="magick-header"><a id="roll"></a>-roll {<var>+-</var>}<var>x</var>{<var>+-</var>}<var>y</var></h3>
				6658	</div>
				6659
				6660	<p class="magick-description">roll an image vertically or horizontally by the amount given.</p>
				6661
				6662	<p>A negative <var>x</var> offset rolls the image right-to-left.
				6663	A negative <var>y</var> offset rolls the image bottom-to-top.</p>
				6664
				6665
				6666	<div style="margin: auto;">
				6667	<h3 class="magick-header"><a id="rotate"></a>-rotate <var>degrees</var>{<var><</var>}{<var>></var>}</h3>
				6668	</div>
				6669
				6670	<p class="magick-description">Apply Paeth image rotation (using shear operations) to the image.</p>
				6671
				6672	<p>Use <code>></code> to rotate the image only if its width exceeds the
				6673	height. <code><</code> rotates the image <var>only</var> if its width is less
				6674	than the height. For example, if you specify <code>-rotate "-90>"</code> and
				6675	the image size is 480x640, the image is not rotated. However, if the image is
				6676	640x480, it is rotated by -90 degrees. If you use <code>></code> or
				6677	<code><</code>, enclose it in quotation marks to prevent it from being
				6678	misinterpreted as a file redirection.</p>
				6679
				6680	<p>Empty triangles in the corners, left over from rotating the image, are
				6681	filled with the <code>background</code> color. </p>
				6682
				6683	<p>See also the <a href="command-line-options.html#distort">-distort</a> operator and specifically the
				6684	'<code>ScaleRotateTranslate</code>' distort method. </p>
				6685
				6686
				6687	<div style="margin: auto;">
				6688	<h3 class="magick-header"><a id="sample"></a>-sample <var>geometry</var></h3>
				6689	</div>
				6690
				6691	<p class="magick-description">minify / magnify the image with pixel subsampling and pixel replication, respectively.</p>
				6692
				6693	<p>Change the image size simply by directly sampling the pixels original
				6694	from the image. When magnifying, pixels are replicated in blocks. When
				6695	minifying, pixels are sub-sampled (i.e., some rows and columns are skipped
				6696	over). </p>
				6697
				6698	<p>The results are thus equivalent to using <a href="command-line-options.html#resize">-resize</a> with
				6699	a <a href="command-line-options.html#filter">-filter</a> setting of <code>point</code> (nearest
				6700	neighbor), though <a href="command-line-options.html#sample">-sample</a> is a lot faster, as it
				6701	avoids all the filter processing of the image. As such it completely ignores
				6702	the current <a href="command-line-options.html#filter">-filter</a> setting. </p>
				6703
				6704	<p>The key feature of the <a href="command-line-options.html#sample">-sample</a> is that no new colors
				6705	will be added to the resulting image, though some colors may disappear. </p>
				6706
				6707	<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
				6708	ignored, unlike <a href="command-line-options.html#resize">-resize</a>. </p>
				6709
				6710
				6711	<p>The actual sampling point is the middle of the sub-region being sampled.
				6712	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]	6713	top-left-middle if image has even dimensions). However the <a
				6714	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]	6715	this position some other location within each sub-region being sampled, as
				6716	a percentage offset.</p>
				6717
				6718	<p>By default this value is '<code>50</code>' for the midpoint, but could be set
				6719	to '<code>0</code>' for top-left, '<code>100</code>' for bottom-right, or with
				6720	separate X and Y offsets such as '<code>0x50</code>' for left-middle edge of
				6721	sampling sub-region.</p>
				6722
				6723
				6724	<div style="margin: auto;">
				6725	<h3 class="magick-header"><a id="sampling-factor"></a>-sampling-factor <var>horizontal-factor</var>x<var>vertical-factor</var></h3>
				6726	</div>
				6727
				6728	<p class="magick-description">sampling factors used by JPEG or MPEG-2 encoder and YUV decoder/encoder.</p>
				6729
				6730	<p>This option specifies the sampling factors to be used by the JPEG encoder
				6731	for chroma downsampling. If this option is omitted, the JPEG library will use
				6732	its own default values. When reading or writing the YUV format and when
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6733	writing the M2V (MPEG-2) format, use <a
				6734	href="command-line-options.html#sampling-factor">-sampling-factor 2x1</a> or <a
				6735	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]	6736	downsampling method.</p>
				6737
				6738	<div style="margin: auto;">
				6739	<h3 class="magick-header"><a id="scale"></a>-scale <var>geometry</var></h3>
				6740	</div>
				6741
				6742	<p class="magick-description">minify / magnify the image with pixel block averaging and pixel replication, respectively.</p>
				6743
				6744	<p>Change the image size simply by replacing pixels by averaging pixels
				6745	together when minifying, or replacing pixels when magnifying. </p>
				6746
				6747	<p>The results are thus equivalent to using <a href="command-line-options.html#resize">-resize</a> with
				6748	a <a href="command-line-options.html#filter">-filter</a> setting of <code>box</code>. Though it is a lot
				6749	faster, as it avoids all the filter processing of the image. As such it
				6750	completely ignores the current <a href="command-line-options.html#filter">-filter</a> setting. </p>
				6751
				6752	<p>If when shrinking (minifying) images the original image is some integer
				6753	multiple of the new image size, the number of pixels averaged together to
				6754	produce the new pixel color is the same across the whole image. This is
				6755	a special case known as 'binning' and is often used as a method of reducing
				6756	noise in image such as those generated by digital cameras, especially in low
				6757	light conditions. </p>
				6758
				6759
				6760	<div style="margin: auto;">
				6761	<h3 class="magick-header"><a id="scene"></a>-scene <var>value</var></h3>
				6762	</div>
				6763
				6764	<p class="magick-description">set scene number.</p>
				6765
				6766	<p>This option sets the scene number of an image or the first image in an image sequence.</p>
				6767
				6768	<div style="margin: auto;">
				6769	<h3 class="magick-header"><a id="screen"></a>-screen</h3>
				6770	</div>
				6771
				6772	<p class="magick-description">specify the screen to capture.</p>
				6773
				6774	<p>This option indicates that the GetImage request used to obtain the image
				6775	should be done on the root window, rather than directly on the specified
				6776	window. In this way, you can obtain pieces of other windows that overlap the
				6777	specified window, and more importantly, you can capture menus or other popups
				6778	that are independent windows but appear over the specified window.</p>
				6779
				6780	<div style="margin: auto;">
				6781	<h3 class="magick-header"><a id="seed"></a>-seed</h3>
				6782	</div>
				6783
				6784	<p class="magick-description">seed a new sequence of pseudo-random numbers</p>
				6785
				6786	<div style="margin: auto;">
				6787	<h3 class="magick-header"><a id="segment"></a>-segment <var>cluster-threshold</var>x<var>smoothing-threshold</var></h3>
				6788	</div>
				6789
				6790	<p class="magick-description">segment the colors of an image.</p>
				6791
				6792	<p>Segment an image by analyzing the histograms of the color components and
				6793	identifying units that are homogeneous with the fuzzy c-means technique. This
				6794	is part of the ImageMagick color quantization routines. </p>
				6795
				6796	<p>Specify <var>cluster threshold</var> as the number of pixels in
				6797	each cluster that must exceed the cluster threshold to be considered valid.
				6798	<var>Smoothing threshold</var> eliminates noise in the second
				6799	derivative of the histogram. As the value is increased, you can expect
				6800	a smoother second derivative. The default is 1.5.</p>
				6801
				6802	<p>If the <a href="command-line-options.html#verbose">-verbose</a> setting is defined, a detailed report
				6803	of the color clusters is returned.</p>
				6804
				6805
				6806	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6807	<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]	6808	</div>
				6809
				6810	<p class="magick-description">Selectively blur pixels within a contrast threshold.</p>
				6811
				6812	<p>Blurs those pixels that are less than or equal to the threshold in
				6813	contrast. The threshold may be expressed as a fraction of <var>QuantumRange</var> or as a percentage.</p>
				6814
				6815	<div style="margin: auto;">
				6816	<h3 class="magick-header"><a id="separate"></a>-separate</h3>
				6817	</div>
				6818
				6819	<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>
				6820
				6821	<div style="margin: auto;">
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	6822	<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]	6823	</div>
				6824
				6825	<p class="magick-description">simulate a sepia-toned photo.</p>
				6826
				6827	<p>Specify <var>threshold</var> as the percent threshold of the intensity (0 - 99.9%).</p>
				6828
				6829	<p>This option applies a special effect to the image, similar to the effect
				6830	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
				6831	toning. A threshold of 80% is a good starting point for a reasonable
				6832	tone.</p>
				6833
				6834
				6835
				6836	<div style="margin: auto;">
				6837	<h3 class="magick-header"><a id="set"></a>-set <var>key value</var></h3>
				6838	<h3 class="magick-header">+set <var>key</var></h3>
				6839	</div>
				6840
				6841	<p class="magick-description">sets image attributes and properties for images in the current image sequence.</p>
				6842
				6843	<p>This will assign (or modify) specific settings attached to all the images
				6844	in the current image sequence. Using the <a href="command-line-options.html#set">+set</a> form of the
				6845	option will either remove, or reset that setting to a default state, as
				6846	appropriate. </p>
				6847
				6848	<p>For example, it will modify specific well known image meta-data
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6849	'attributes' such as those normally overridden by: the options <a
				6850	href="command-line-options.html#delay" >-delay</a>, <a href="command-line-options.html#dispose" >-dispose</a>, and <a
				6851	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]	6852	assigned before the image is read in, by using a <var>key</var> of
				6853	the same name. </p>
				6854
				6855	<p>If the given <var>key</var> does not match a specific known
				6856	'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]	6857	'property' string. Such settings are listed in <a href="command-line-options.html#verbose"
				6858	>-verbose</a> information ("<code>info:</code>" output format) as "Properties".
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6859	</p>
				6860
				6861	<p>This includes string 'properties' that are set by and assigned to images
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6862	using the options <a href="command-line-options.html#comment" >-comment</a>, <a href="command-line-options.html#label"
				6863	>-label</a>, <a href="command-line-options.html#caption" >-caption</a>. These options actually assign
				6864	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]	6865	Escapes</a> expanded) to images as they are read in. For example:</p>
				6866
				6867	<pre>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6868	-> 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]	6869	identify -format %c rose.png
				6870	Rose is a rose is a rose is a rose
				6871	</pre>
				6872
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6873	<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]	6874	Properties</a> in the defined value. For example:</p>
				6875
				6876	<pre>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6877	-> convert rose: -set origsize '%wx%h' -resize 50% \
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6878	-format 'Old size = %[origsize] New size = %wx%h' info:
				6879	Old size = 70x46 New size = 35x23
				6880	</pre>
				6881
				6882	<p>Other well known 'properties' that are available include:
				6883	'<code>date:create</code>' and '<code>date:modify</code>' and
				6884	'<code>signature</code>'. </p>
				6885
				6886	<p>The <a href="command-line-options.html#repage">-repage</a> operator will also allow you to modify
				6887	the '<code>page</code>' attribute of an image for images already in memory (also
				6888	see <a href="command-line-options.html#repage">-page</a>). However it is designed to provide a finer
				6889	control of the sub-parts of this 'attribute'. The <a href="command-line-options.html#set">-set page</a>
				6890	option will only provide a direct, unmodified assignment of '<code>page</code>'
				6891	attribute. </p>
				6892
				6893	<p>This option can also associate a colorspace or profile with your image.
				6894	For example,</p>
				6895
				6896	<pre>
				6897	convert image.psd -set profile ISOcoated_v2_eci.icc image-icc.psd
				6898	</pre>
				6899
				6900	<p>Some 'properties' must be defined in a specific way to be used. For
				6901	example only 'properties' prefixed with "<code>filename:</code>" can be used to
				6902	modify the output filename of an image. For example</p>
				6903
				6904	<pre>
				6905	convert rose: -set filename:mysize '%wx%h' 'rose_%[filename:mysize].png'
				6906	</pre>
				6907
				6908	<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]	6909	be saved as a global "Artifact" exactly as if it was set using the <a
				6910	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]	6911	can be used to pass 'attributes' and 'properties' of one specific image,
				6912	in a way that allows you to use them in a completely different image, even if
				6913	the original image has long since been modified or destroyed. For example: </p>
				6914
				6915	<pre>
				6916	convert rose: -set option:rosesize '%wx%h' -delete 0 \
				6917	label:'%[rosesize]' label_size_of_rose.gif"
				6918	</pre>
				6919
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6920	<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]	6921	a 'artifact' if the given <var>key</var> does not match an existing
				6922	'attribute' or 'property'. </p>
				6923
				6924	<p>You can set the attributes of the image registry by prefixing the value
				6925	with <code>registry:</code>.</p>
				6926
				6927	<p>The <a href="command-line-options.html#set">-set profile</a> option can also be used to inject
				6928	previously-formatted ancillary chunks into the output PNG file, using
				6929	the commandline option as shown below or by setting the profile via a
				6930	programming interface:</p>
				6931
				6932	<pre>
				6933	convert in.png -set profile PNG-chunk-x:<filename> out.png
				6934	</pre>
				6935
				6936	<p>where <var>x</var> is a location flag and
				6937	<var>filename</var> is a file containing the chunk
				6938	name in the first 4 bytes, then a colon (":"), followed by the chunk data.
				6939	This encoder will compute the chunk length and CRC, so those must not
				6940	be included in the file.</p>
				6941
				6942	<p>"x" can be "b" (before PLTE), "m" (middle, i.e., between PLTE and IDAT),
				6943	or "e" (end, i.e., after IDAT). If you want to write multiple chunks
				6944	of the same type, then add a short unique string after the "x" to prevent
				6945	subsequent profiles from overwriting the preceding ones, e.g.,</p>
				6946
				6947
				6948	<pre>
				6949	convert in.png -set profile PNG-chunk-b01:file01 \
				6950	-profile PNG-chunk-b02:file02 out.png
				6951	</pre>
				6952
				6953	<div style="margin: auto;">
				6954	<h3 class="magick-header"><a id="shade"></a>-shade <var>azimuth</var>x<var>elevation</var></h3>
				6955	</div>
				6956
				6957	<p class="magick-description">shade the image using a distant light source.</p>
				6958
				6959	<p>Specify <var>azimuth</var> and <var>elevation</var> as
				6960	the position of the light source. Use <a href="command-line-options.html#shade">+shade</a> to return
				6961	the shading results as a grayscale image.</p>
				6962
				6963	<div style="margin: auto;">
				6964	<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>
				6965	</div>
				6966
				6967	<p class="magick-description">simulate an image shadow.</p>
				6968
				6969	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6970	<h3 class="magick-header"><a
				6971	id="shared-memory"></a>-shared-memory</h3>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	6972	</div>
				6973
				6974	<p class="magick-description">use shared memory.</p>
				6975
				6976	<p>This option specifies whether the utility should attempt to use shared
				6977	memory for pixmaps. ImageMagick must be compiled with shared memory support,
				6978	and the display must support the <var>MIT-SHM</var> extension.
				6979	Otherwise, this option is ignored. The default is <code>True</code>.</p>
				6980
				6981	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	6982	<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]	6983	</div>
				6984
				6985	<p class="magick-description">sharpen the image.</p>
				6986
				6987	<p>Use a Gaussian operator of the given radius and standard deviation (sigma).</p>
				6988
				6989	<div style="margin: auto;">
				6990	<h3 class="magick-header"><a id="shave"></a>-shave <var>geometry</var></h3>
				6991	</div>
				6992
				6993	<p class="magick-description">Shave pixels from the image edges.</p>
				6994
				6995	<p>The <var>size</var> portion of the <var>geometry</var>
				6996	argument specifies the width of the region to be removed from both sides of
				6997	the image and the height of the regions to be removed from top and bottom.
				6998	Offsets are ignored.</p>
				6999
				7000	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				7001
				7002	<div style="margin: auto;">
				7003	<h3 class="magick-header"><a id="shear"></a>-shear <var>Xdegrees</var>[x<var>Ydegrees</var>]</h3>
				7004	</div>
				7005
				7006	<p class="magick-description">Shear the image along the x-axis and/or y-axis.</p>
				7007
				7008	<p>The shear angles may be positive, negative, or zero. When <var>Ydegrees</var> is omitted it defaults to 0. When both angles are
				7009	given, the horizontal component of the shear is performed before the vertical
				7010	component.</p>
				7011
				7012	<p>Shearing slides one edge of an image along the x-axis or y-axis (i.e.,
				7013	horizontally or vertically, respectively),creating a parallelogram. The amount
				7014	of each is controlled by the respective shear angle. For horizontal shears,
				7015	<var>Xdegrees</var> is measured clockwise relative to "up" (the
				7016	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
				7017	positive x-axis), sliding the right edge down when 0°<<var>Ydegrees</var><90° and up when 90°<<var>Ydegrees</var><180°.</p>
				7018
				7019	<p>Empty triangles left over from shearing the image are filled with the color
				7020	defined by the <a href="command-line-options.html#fill">-background</a> option. The color is specified
				7021	using the format described under the <a href="command-line-options.html#fill">-fill</a> option.</p>
				7022
				7023	<p>The horizontal shear is performed before the vertical part. This is
				7024	important to note, since horizontal and vertical shears do not
				7025	<var>commute</var>, i.e., the order matters in a sequence of shears. For
				7026	example, the following two commands are not equivalent.</p>
				7027
				7028	<pre>
				7029	convert logo: -shear 20x0 -shear 0x60 logo-sheared.png
				7030	convert logo: -shear 0x60 -shear 20x0 logo-sheared.png
				7031	</pre>
				7032
				7033	<p>The first of the two commands above is equivalent to the following, except
				7034	for the amount of empty space created; the command that follows generates
				7035	a smaller image, and so is a better choice in terms of time and space.</p>
				7036
				7037	<pre>
				7038	convert logo: -shear 20x60 logo-sheared.png
				7039	</pre>
				7040
				7041	<div style="margin: auto;">
				7042	<h3 class="magick-header"><a id="sigmoidal-contrast"></a>-sigmoidal-contrast <var>contrast</var>x<var>mid-point</var></h3>
				7043	</div>
				7044
				7045	<p class="magick-description">increase the contrast without saturating highlights or shadows.</p>
				7046
				7047	<p>Increase the contrast of the image using a sigmoidal transfer function
				7048	without saturating highlights or shadows. <var>Contrast</var>
				7049	indicates how much to increase the contrast. For example, 0 is none, 3 is
				7050	typical and 20 is a lot.
				7051	</p>
				7052
				7053	<p>The <var>mid-point</var> indicates where the maximum change
				7054	'slope' in contrast should fall in the resultant image (0 is white; 50% is
				7055	middle-gray; 100% is black). </p>
				7056
				7057	<p>By default the image contrast is increased, use <var>+sigmoidal-contrast</var> to decrease the contrast.</p>
				7058
				7059	<p>To achieve the equivalent of a sigmoidal brightness change (similar to
				7060	a gamma adjustment), you would use <var>-sigmoidal-contrast
				7061	{brightness}x0%</var> to increase brightness and <var>+sigmoidal-contrast {brightness}x0%</var> to decrease brightness.
				7062	Note the use of '0' fo rthe mid-point of the sigmoidal curve. </p>
				7063
				7064	<p>Using a very high <var>contrast</var> will produce a sort of
				7065	'smoothed thresholding' of the image. Not as sharp (with high aliasing
				7066	effects) of a true threshold, but with tapered gray-levels around the threshold
				7067	<var>mid-point</var>. </p>
				7068
				7069	<div style="margin: auto;">
				7070	<h3 class="magick-header"><a id="silent"></a>-silent</h3>
Cristy	f650f4f	2016-04-01 10:53:07 -0400	[diff] [blame]	7071
				7072
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7073	</div>
				7074
Cristy	f650f4f	2016-04-01 10:53:07 -0400	[diff] [blame]	7075	<p class="magick-description">operate silently. This option is only used
				7076	by the <a href="import.html">import</a> tool.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7077
				7078	<div style="margin: auto;">
				7079	<h3 class="magick-header"><a id="similarity-threshold"></a>-similarity-threshold <var>value</var></h3>
				7080	</div>
				7081
				7082	<p class="magick-description">minimum RMSE for subimage match.</p>
				7083
				7084	<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>
				7085
				7086	<div style="margin: auto;">
				7087	<h3 class="magick-header"><a id="size"></a>-size <var>width</var>[x<var>height</var>][<var>+offset</var>]</h3>
				7088	</div>
				7089
				7090	<p class="magick-description">set the width and height of the image.</p>
				7091
				7092	<p>Use this option to specify the width and height of raw images whose
				7093	dimensions are unknown such as <code>GRAY</code>, <code>RGB</code>, or
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7094	<code>CMYK</code>. In addition to width and height, use <a
				7095	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]	7096	image or tell the number of colors in a <code>MAP</code> image file, (e.g. -size
				7097	640x512+256).</p>
				7098
				7099	<p>For Photo CD images, choose from these sizes:</p>
				7100
				7101	<pre>
				7102	192x128
				7103	384x256
				7104	768x512
				7105	1536x1024
				7106	3072x2048
				7107	</pre>
				7108
				7109	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7110	<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]	7111	</div>
				7112
				7113	<p class="magick-description">simulate a pencil sketch.</p>
				7114
				7115	<p>Sketch with the given radius, standard deviation (sigma), and angle. The
				7116	angle given is the angle toward which the image is sketched. That is the
				7117	direction people would consider the object is coming from. </p>
				7118
				7119	<div style="margin: auto;">
				7120	<h3 class="magick-header"><a id="smush"></a>-smush <var>offset</var></h3>
				7121	</div>
				7122
Cristy	bc23242	2016-11-22 07:46:18 -0500	[diff] [blame^]	7123	<p class="magick-description">appends an image sequence together ignoring transparency.</p>
				7124
				7125	<p>Smush is a more flexible version of <a href="command-line-options.html#append">-append</a>, joining the images in the sequence top-to-bottom (<a href="command-line-options.html#smush">-smush</a>) or left-to-right (<a href="command-line-options.html#smush">+smush</a>), with a gap between images according to the specified offset.</p>
				7126
				7127	<p>If the offset is negative, images will overlap by that amount.</p>
				7128
				7129	<p><a href="command-line-options.html#smush">-smush</a> respects <a href="command-line-options.html#gravity">-gravity</a>. Any empty space will be filled with the <a href="command-line-options.html#background">-background</a> color.</p>
				7130
				7131	<p>For zero offset and transparent images, the non-transparent parts of the two images will be aligned as close as possible without overlapping.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7132
				7133	<div style="margin: auto;">
				7134	<h3 class="magick-header"><a id="snaps"></a>-snaps <var>value</var></h3>
				7135	</div>
				7136
				7137	<p class="magick-description">Set the number of screen snapshots.</p>
				7138
				7139	<p>Use this option to grab more than one image from the X server screen, to create an animation sequence.</p>
				7140
				7141	<div style="margin: auto;">
Cristy	769d889	2016-01-19 18:11:14 -0500	[diff] [blame]	7142	<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]	7143	</div>
				7144
				7145	<p class="magick-description">negate all pixels above the threshold level.</p>
				7146
				7147	<p>Specify <var>factor</var> as the percent threshold of the intensity (0 - 99.9%).</p>
				7148
				7149	<p>This option produces a <var>solarization</var> effect seen when
				7150	exposing a photographic film to light during the development process.</p>
				7151
				7152	<div style="margin: auto;">
				7153	<h3 class="magick-header"><a id="sparse-color"></a>-sparse-color <var>method</var> '<var>x</var>,<var>y</var> <var>color</var> ...'</h3>
				7154	</div>
				7155
				7156	<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>
				7157
				7158
				7159	<dl class="dl-horizontal">
				7160	<dt>barycentric</dt>
				7161	<dd>three point triangle of color given 3 points.
				7162	Giving only 2 points will form a linear gradient between those points.
				7163	The gradient generated extends beyond the triangle created by those
				7164	3 points. </dd>
				7165	<dt>bilinear</dt>
				7166	<dd>Like barycentric but for 4 points. Less than 4 points
				7167	fall back to barycentric. </dd>
				7168	<dt>voronoi</dt>
				7169	<dd>Simply map each pixel to the to nearest color point
				7170	given. The result are polygonal 'cells' of solid color. </dd>
				7171	<dt>manhatten</dt>
				7172	<dd>Like voronoi, but resulting polygonal 'cells' are mapped to a fixed coordinate system.</dd>
				7173	<dt>shepards</dt>
				7174	<dd>Colors points biased on the ratio of inverse distance
				7175	squared. Generating spots of color in a sea of the average of
				7176	colors. </dd>
				7177	<dt>inverse</dt>
				7178	<dd>Colors points biased on the ratio of inverse distance.
				7179	This generates sharper points of color rather than rounded spots of
				7180	'<code>shepards</code>' Generating spots of color in a sea of the
				7181	average of colors. </dd>
				7182	</dl>
				7183
				7184	<p>The points are placed according to the images location on the virtual
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7185	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]	7186	offset), and do not actually have to exist on the given image, but may be
				7187	some point beyond the edge of the image. All points are floating point values.
				7188	</p>
				7189
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7190	<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]	7191	modified, which means that by default matte/alpha transparency channel is not
				7192	effected. Typically transparency channel is turned off either before or after
				7193	the operation. </p>
				7194
				7195	<p>Of course if some color points are transparent to generate a transparent
				7196	gradient, then the image also requires transparency enabled to store the
				7197	values. </p>
				7198
				7199	<p>All the above methods when given a single point of color will replace all
				7200	the colors in the image with the color given, regardless of the point. This is
				7201	logical, and provides an alternative technique to recolor an image to some
				7202	default value. </p>
				7203
				7204
				7205	<div style="margin: auto;">
				7206	<h3 class="magick-header"><a id="splice"></a>-splice <var>geometry</var></h3>
				7207	</div>
				7208
				7209	<p class="magick-description">Splice the current background color into the image.</p>
				7210
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7211	<p>This will add rows and columns of the current <a
				7212	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]	7213	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
				7214	image into four quadrants, separating them by the inserted rows and columns.
				7215	</p>
				7216
				7217	<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]	7218	dimension. Similarly using a zero offset with the appropriate <a
				7219	href="command-line-options.html#gravity">-gravity</a> setting will add rows and columns to the edges of
				7220	the image, padding the image only along that one edge. Edge padding is what <a
				7221	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]	7222
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7223	<p>If the exact same <var>geometry</var> and <a
				7224	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]	7225	added added all splices removed. </p>
				7226
				7227	<div style="margin: auto;">
				7228	<h3 class="magick-header"><a id="spread"></a>-spread <var>amount</var></h3>
				7229	</div>
				7230
				7231	<p class="magick-description">displace image pixels by a random amount.</p>
				7232
				7233	<p>The argument <var>amount</var> defines the size of the
				7234	neighborhood around each pixel from which to choose a candidate pixel to
				7235	blend.</p>
				7236
				7237	<p>The lookup is controlled by the <a href="command-line-options.html#interpolate">-interpolate</a> setting.</p>
				7238
				7239	<div style="margin: auto;">
				7240	<h3 class="magick-header"><a id="statistic"></a>-statistic <var>type</var> <var>geometry</var></h3>
				7241	</div>
				7242
				7243	<p class="magick-description">replace each pixel with corresponding statistic from the neighborhood.</p>
				7244
				7245	<p>Choose from these statistic types:</p>
				7246	<dl class="dl-horizontal">
				7247	<dt>Gradient</dt><dd>maximum difference (max - min) value in neighborhood</dd>
				7248	<dt>Maximum</dt><dd>maximum value per channel in neighborhood</dd>
				7249	<dt>Minimum</dt><dd>minimum value per channel in neighborhood</dd>
				7250	<dt>Mean</dt><dd>average value per channel in neighborhood</dd>
				7251	<dt>Median</dt><dd>median value per channel in neighborhood</dd>
				7252	<dt>Mode</dt><dd>mode (most frequent) value per channel in neighborhood</dd>
				7253	<dt>Nonpeak</dt><dd>value just before or after the median value per channel in neighborhood</dd>
				7254	<dt>RMS</dt><dd>root mean square value per channel in neighborhood</dd>
				7255	<dt>StandardDeviation</dt><dd> standard deviation value per channel in neighborhood</dd>
				7256	</dl>
				7257
				7258	<div style="margin: auto;">
				7259	<h3 class="magick-header"><a id="stegano"></a>-stegano <var>offset</var></h3>
				7260	</div>
				7261
				7262	<p class="magick-description">hide watermark within an image.</p>
				7263
				7264	<p>Use an offset to start the image hiding some number of pixels from the
				7265	beginning of the image. Note this offset and the image size. You will need
				7266	this information to recover the steganographic image (e.g. display -size
				7267	320x256+35 stegano:image.png).</p>
				7268
				7269	<div style="margin: auto;">
				7270	<h3 class="magick-header"><a id="stereo"></a>-stereo <var>+x</var>{<var>+y</var>}</h3>
				7271	</div>
				7272
				7273	<p class="magick-description">composite two images to create a red / cyan stereo anaglyph.</p>
				7274
				7275	<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>
				7276
				7277	<div style="margin: auto;">
				7278	<h3 class="magick-header"><a id="storage-type"></a>-storage-type <var>type</var></h3>
				7279	</div>
				7280
				7281	<p class="magick-description">pixel storage type. Here are the valid types:</p>
				7282
				7283	<dl class="dl-horizontal">
				7284	<dt>char</dt><dd>unsigned characters</dd>
				7285	<dt>double</dt><dd>doubles</dd>
				7286	<dt>float</dt><dd>floats</dd>
				7287	<dt>integer</dt><dd>integers</dd>
				7288	<dt>long</dt><dd>longs</dd>
				7289	<dt>quantum</dt><dd>pixels in the native depth of your ImageMagick distribution</dd>
				7290	<dt>short</dt><dd>unsigned shorts</dd>
				7291	</dl>
				7292
				7293	<p>Float and double types are normalized from 0.0 to 1.0 otherwise the pixels
				7294	values range from 0 to the maximum value the storage type can support.</p>
				7295
				7296	<div style="margin: auto;">
				7297	<h3 class="magick-header"><a id="stretch"></a>-stretch <var>fontStretch</var></h3>
				7298	</div>
				7299
				7300	<p class="magick-description">Set a type of stretch style for fonts.</p>
				7301
				7302	<p>This setting suggests a type of stretch that ImageMagick should try to
				7303	apply to the currently selected font family. Select <var>fontStretch</var> from the following.</p>
				7304
				7305	<pre>
				7306	Any
				7307	Condensed
				7308	Expanded
				7309	ExtraCondensed
				7310	ExtraExpanded
				7311	Normal
				7312	SemiCondensed
				7313	SemiExpanded
				7314	UltraCondensed
				7315	UltraExpanded
				7316	</pre>
				7317
				7318	<p>To print a complete list of stretch types, use <a href="command-line-options.html#list">-list
				7319	stretch</a>.</p>
				7320
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7321	<p>For other settings that affect fonts, see the options <a
				7322	href="command-line-options.html#font">-font</a>, <a href="command-line-options.html#family">-family</a>, <a
				7323	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]	7324
				7325	<div style="margin: auto;">
				7326	<h3 class="magick-header"><a id="strip"></a>-strip</h3>
				7327	</div>
				7328
Cristy	776113a	2016-04-29 12:01:19 -0400	[diff] [blame]	7329	<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]	7330
				7331	<div style="margin: auto;">
				7332	<h3 class="magick-header"><a id="stroke"></a>-stroke <var>color</var></h3>
				7333	</div>
				7334
				7335	<p class="magick-description">color to use when stroking a graphic primitive.</p>
				7336
				7337	<p>The color is specified using the format described under the <a href="command-line-options.html#fill">-fill</a> option.</p>
				7338
				7339	<p>See <a href="command-line-options.html#draw">-draw</a> for further details.</p>
				7340
				7341	<div style="margin: auto;">
				7342	<h3 class="magick-header"><a id="strokewidth"></a>-strokewidth <var>value</var></h3>
				7343	</div>
				7344
				7345	<p class="magick-description">set the stroke width.</p>
				7346
				7347	<p>See <a href="command-line-options.html#draw">-draw</a> for further details.</p>
				7348
				7349	<div style="margin: auto;">
				7350	<h3 class="magick-header"><a id="style"></a>-style <var>fontStyle</var></h3>
				7351	</div>
				7352
				7353	<p class="magick-description">Set a font style for text.</p>
				7354
				7355	<p>This setting suggests a font style that ImageMagick should try to apply to
				7356	the currently selected font family. Select <var>fontStyle</var> from
				7357	the following.</p>
				7358
				7359	<pre>
				7360	Any
				7361	Italic
				7362	Normal
				7363	Oblique
				7364	</pre>
				7365
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7366	<p>For other settings that affect fonts, see the options <a
				7367	href="command-line-options.html#font">-font</a>, <a href="command-line-options.html#family">-family</a>, <a
				7368	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]	7369
				7370	<div style="margin: auto;">
				7371	<h3 class="magick-header"><a id="subimage-search"></a>-subimage-search</h3>
				7372	</div>
				7373
				7374	<p class="magick-description">search for subimage.</p>
				7375
				7376	<p>This option is required to have compare search for the best match location
				7377	of a small image within a larger image. This search will produce two images
				7378	(or two frames). The first is the "difference" image and the second will
				7379	be the "match score" image.</p>
				7380
				7381	<p>The "match-score" image is smaller containing a pixel for ever possible
				7382	position of the top-left corner of the given sub-image. that is its size will
				7383	be the size of the larger_image - sub_image + 1. The brightest location in
				7384	this image is the location s the locate on the best match that is also
				7385	reported. Note that this may or may not be a perfect match, and the actual
				7386	brightness will reflect this. Other bright 'peaks' can be used to locate other
				7387	possible matching locations. </p>
				7388
				7389	<p>Note that the search will try to compare the sub-image at every possible
				7390	location in the larger image, as such it can be very slow. The smaller the
				7391	sub-image the faster this search is. </p>
				7392
				7393
				7394	<div style="margin: auto;">
				7395	<h3 class="magick-header"><a id="swap"></a>-swap <var>index,index</var></h3>
				7396	</div>
				7397
				7398	<p class="magick-description">Swap the positions of two images in the image sequence.</p>
				7399
				7400	<p>For example, <a href="command-line-options.html#swap">-swap 0,2</a> swaps the first and the third
				7401	images in the current image sequence. Use <a href="command-line-options.html#swap">+swap</a> to switch
				7402	the last two images in the sequence.</p>
				7403
				7404	<div style="margin: auto;">
				7405	<h3 class="magick-header"><a id="swirl"></a>-swirl <var>degrees</var></h3>
				7406	</div>
				7407
				7408	<p class="magick-description">swirl image pixels about the center.</p>
				7409
				7410	<p><var>Degrees</var> defines the tightness of the swirl.</p>
				7411
				7412	<div style="margin: auto;">
				7413	<h3 class="magick-header"><a id="synchronize"></a>-synchronize</h3>
				7414	</div>
				7415
				7416	<p class="magick-description">synchronize image to storage device.</p>
				7417
				7418	<p>Set to "true" to ensure all image data is fully flushed and synchronized
				7419	to disk. There is a performance penalty, but the benefits include ensuring a
				7420	valid image file in the event of a system crash and early reporting if there
				7421	is not enough disk space for the image pixel cache.</p>
				7422
				7423	<div style="margin: auto;">
				7424	<h3 class="magick-header"><a id="taint"></a>-taint</h3>
				7425	</div>
				7426
				7427	<p class="magick-description">Mark the image as modified.</p>
				7428
				7429	<div style="margin: auto;">
				7430	<h3 class="magick-header"><a id="text-font"></a>-text-font <var>name</var></h3>
				7431	</div>
				7432
				7433	<p class="magick-description">font for writing fixed-width text.</p>
				7434
				7435	<p>Specifies the name of the preferred font to use in fixed (typewriter style)
				7436	formatted text. The default is 14 point <var>Courier</var>.</p>
				7437
				7438	<p>You can tag a font to specify whether it is a PostScript, TrueType, or
				7439	OPTION1 font. For example, <code>Courier.ttf</code> is a TrueType font and
				7440	<code>x:fixed</code> is OPTION1.</p>
				7441
				7442	<div style="margin: auto;">
				7443	<h3 class="magick-header"><a id="texture"></a>-texture <var>filename</var></h3>
				7444	</div>
				7445
				7446	<p class="magick-description">name of texture to tile onto the image background.</p>
				7447
				7448	<div style="margin: auto;">
				7449	<h3 class="magick-header"><a id="threshold"></a>-threshold <var>value</var>{<var>%</var>}</h3>
				7450	</div>
				7451
				7452	<!-- {<var>green,blue,opacity</var>}
				7453	<p>If the green or blue value is omitted, these channels use the same value as
				7454	the first one provided. If all three color values are the same, the result is
				7455	a bi-level image. If the opacity threshold is omitted, OpaqueOpacity is used
				7456	and any partially transparent pixel becomes fully transparent.</p>
				7457	-->
				7458
				7459	<p class="magick-description">Apply simultaneous black/white threshold to the image.</p>
				7460
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7461	<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]	7462	maximum channel value, while all other values are assigned the minimum.</p>
				7463
				7464	<p> The threshold value can be given as a percentage or as an absolute integer
				7465	value corresponding to the desired channel value. When given as an integer,
				7466	the minimum attainable value is 0 (corresponding to black when all channels
				7467	are affected), but the maximum value (corresponding to white) is that of the
				7468	<code>quantum depth</code> of the particular build of ImageMagick, and is
				7469	therefore dependent on the installation. For that reason, a reasonable
				7470	recommendation for most applications is to specify the threshold values as
				7471	a percentage. </p>
				7472
				7473	<p> The following would force pixels with red values above 50% to have 100%
				7474	red values, while those at or below 50% red would be set to 0 in the red
				7475	channel. The green, blue, and alpha channels (if present) would be unchanged.
				7476	</p>
				7477
				7478	<pre>
				7479	convert in.png -channel red -threshold 50% out.png
				7480	</pre>
				7481
				7482	<p>As (possibly) impractical but instructive examples, the following would
				7483	generate an all-black and an all-white image with the same dimensions as the
				7484	input image.</p>
				7485
				7486
				7487	<pre>
				7488	convert in.png -threshold 100% black.png
				7489	convert in.png -threshold -1 white.png
				7490	</pre>
				7491
				7492	<p>Note that the values of the transparency channel is treated as 'matte'
				7493	values (0 is opaque) and not as 'alpha' values (0 is transparent).</p>
				7494
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7495	<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]	7496	</p>
				7497
				7498	<div style="margin: auto;">
				7499	<h3 class="magick-header"><a id="thumbnail"></a>-thumbnail <var>geometry</var></h3>
				7500	</div>
				7501
				7502	<p class="magick-description">Create a thumbnail of the image.</p>
				7503
				7504	<p>This is similar to <a href="command-line-options.html#resize">-resize</a>, except it is optimized
				7505	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]	7506	reduce the thumbnail size. To strip the color profiles as well, add <a
				7507	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]	7508
				7509	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				7510
				7511	<div style="margin: auto;">
				7512	<h3 class="magick-header"><a id="tile"></a>-tile <var>filename</var></h3>
				7513	</div>
				7514
				7515	<p class="magick-description">Set the tile image used for filling a subsequent graphic primitive.</p>
				7516
				7517	<div style="margin: auto;">
				7518	<h3 class="magick-header">-tile <var>geometry</var></h3>
				7519	</div>
				7520
				7521	<p class="magick-description">Specify the layout of images.</p>
				7522
				7523	<p>See <a href="command-line-processing.html#geometry">Image Geometry</a> for complete details about the <em class="arg">geometry</em> argument.</p>
				7524
				7525	<div style="margin: auto;">
				7526	<h3 class="magick-header">-tile</h3>
				7527	</div>
				7528
				7529	<p class="magick-description">Specifies that a subsequent composite operation is repeated across and down image.</p>
				7530
				7531	<div style="margin: auto;">
				7532	<h3 class="magick-header"><a id="tile-offset"></a>-tile-offset {<var>+-</var>}<var>x</var>{<var>+-</var>}<var>y</var></h3>
				7533	</div>
				7534
				7535	<p class="magick-description">Specify the offset for tile images, relative to the background image it is tiled on.</p>
				7536
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7537	<p>This should be set before the tiling image is set by <a href="command-line-options.html#tile"
				7538	>-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]	7539	creating a tiled canvas using <code>TILE:</code> or <code>PATTERN:</code> input
				7540	formats. </p>
				7541
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7542	<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]	7543	by the arguments given when the tile image is set. </p>
				7544
				7545	<div style="margin: auto;">
				7546	<h3 class="magick-header"><a id="tint"></a>-tint <var>value</var></h3>
				7547	</div>
				7548
				7549	<p class="magick-description">Tint the image with the fill color.</p>
				7550
				7551	<p>Tint the image with the fill color.</p>
				7552
				7553	<p>Specify the amount of tinting as a percentage. Pure colors like black,
				7554	white red, yellow, will not be affected by -tint. Only mid-range colors such
				7555	as the various shades of grey.</p>
				7556
				7557	<div style="margin: auto;">
				7558	<h3 class="magick-header"><a id="title"></a>-title <var>string</var></h3>
				7559	</div>
				7560
				7561	<p class="magick-description">Assign a title to displayed image.", "animate", "display", "montage</p>
				7562
				7563	<p>Use this option to assign a specific title to the image. This assigned to
				7564	the image window and is typically displayed in the window title bar.
				7565	Optionally you can include the image filename, type, width, height, Exif data,
				7566	or other image attribute by embedding special format characters described
				7567	under the <a href="command-line-options.html#format">-format</a> option.</p>
				7568
				7569	<p>For example,</p>
				7570
				7571	<pre>
				7572	-title "%m:%f %wx%h"
				7573	</pre>
				7574
				7575	<p>produces an image title of <code>MIFF:bird.miff 512x480</code> for an image
				7576	titled <code>bird.miff</code> and whose width is 512 and height is 480.</p>
				7577
				7578
				7579	<div style="margin: auto;">
				7580	<h3 class="magick-header"><a id="transform"></a>-transform</h3>
				7581	</div>
				7582
				7583	<p class="magick-description">transform the image.</p>
				7584
				7585	<p>This option applies the transformation matrix from a previous <a href="command-line-options.html#affine">-affine</a> option.</p>
				7586
				7587	<pre>
				7588	convert -affine 2,2,-2,2,0,0 -transform bird.ppm bird.jpg
				7589	</pre>
				7590
				7591
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7592	<p>This operator has been now been superseded by the <a
				7593	href="command-line-options.html#distort">-distort</a> '<code>AffineProjection</code>' method. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7594
				7595
				7596	<div style="margin: auto;">
				7597	<h3 class="magick-header"><a id="transparent"></a>-transparent <var>color</var></h3>
				7598	</div>
				7599
				7600	<p class="magick-description">Make this color transparent within the image.</p>
				7601
				7602	<p>The <var>color</var> argument is defined using the format
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7603	described under the <a href="command-line-options.html#fill">-fill</a> option. The <a href="command-line-options.html#fuzz"
				7604	>-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]	7605	given. </p>
				7606
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7607	<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]	7608	that is make all non-matching colors transparent. </p>
				7609
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7610	<p>The <a href="command-line-options.html#opaque">-opaque</a> operator is exactly the same as <a
				7611	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]	7612	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]	7613	However the <a href="command-line-options.html#transparent" >-transparent</a> operator also ensures
				7614	that the image has an alpha channel enabled, as per "<code><a href="command-line-options.html#alpha"
				7615	>-alpha</a> set</code>", and does not require you to modify the <a
				7616	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]	7617
				7618	<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]	7619	used for color-mapped image formats, such as GIF. For that use <a
				7620	href="command-line-options.html#transparent-color" >-transparent-color</a> </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7621
				7622
				7623	<div style="margin: auto;">
				7624	<h3 class="magick-header"><a id="transparent-color"></a>-transparent-color <var>color</var></h3>
				7625	</div>
				7626
				7627	<p class="magick-description">Set the transparent color.</p>
				7628
				7629	<p>Sometimes this is used for saving to image formats such as
				7630	GIF and PNG8 which uses this color to represent boolean transparency. This
				7631	does not make a color transparent, it only defines what color the transparent
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7632	color is in the color palette of the saved image. Use <a
				7633	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]	7634
				7635	<p>This option allows you to have both an opaque visible color, as well as a
				7636	transparent color of the same color value without conflict. That is, you can
				7637	use the same color for both the transparent and opaque color areas within an
				7638	image. This, in turn, frees to you to select a transparent color that is
				7639	appropriate when an image is displayed by an application that does not handle a
				7640	transparent color index, while allowing ImageMagick to correctly handle images of this
				7641	type. </p>
				7642
				7643	<p>The default transparent color is <code>#00000000</code>, which is fully transparent black.</p>
				7644
				7645	<div style="margin: auto;">
				7646	<h3 class="magick-header"><a id="transpose"></a>-transpose</h3>
				7647	</div>
				7648
				7649	<p class="magick-description">Mirror the image along the top-left to bottom-right diagonal.</p>
				7650
				7651	<p> This option mathematically transposes the pixel array. It is equivalent to the sequence <code>-flip -rotate 90</code>.
				7652	</p>
				7653
				7654	<div style="margin: auto;">
				7655	<h3 class="magick-header"><a id="transverse"></a>-transverse</h3>
				7656	</div>
				7657
				7658	<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>
				7659
				7660
				7661	<div style="margin: auto;">
				7662	<h3 class="magick-header"><a id="treedepth"></a>-treedepth <var>value</var></h3>
				7663	</div>
				7664
				7665	<p class="magick-description">tree depth for the color reduction algorithm.</p>
				7666
				7667	<p>Normally, this integer value is zero or one. A value of zero or one causes
				7668	the use of an optimal tree depth for the color reduction algorithm.</p>
				7669
				7670	<p>An optimal depth generally allows the best representation of the source
				7671	image with the fastest computational speed and the least amount of memory.
				7672	However, the default depth is inappropriate for some images. To assure the
				7673	best representation, try values between 2 and 8 for this parameter. Refer to
Cristy	6549abb	2016-11-10 08:25:55 -0500	[diff] [blame]	7674	the <a href="http://www.imagemagick.org/www/quantize.html"
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7675	>color reduction algorithm</a> for more details.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7676
				7677	<p>The <a href="command-line-options.html#colors">-colors</a> or <a href="command-line-options.html#monochrome">-monochrome</a>
				7678	option, or writing to an image format which requires color reduction, is
				7679	required for this option to take effect.</p>
				7680
				7681	<div style="margin: auto;">
				7682	<h3 class="magick-header"><a id="trim"></a>-trim</h3>
				7683	</div>
				7684
				7685	<p class="magick-description">trim an image.</p>
				7686
				7687	<p>This option removes any edges that are exactly the same color as the corner
				7688	pixels. Use <a href="command-line-options.html#fuzz">-fuzz</a> to make <a href="command-line-options.html#trim">-trim</a> remove
				7689	edges that are nearly the same color as the corner pixels.</p>
				7690
				7691	<p>The page or virtual canvas information of the image is preserved allowing
				7692	you to extract the result of the <a href="command-line-options.html#trim">-trim</a> operation from the
				7693	image. Use a <a href="command-line-options.html#repage">+repage</a> to remove the virtual canvas page
				7694	information if it is unwanted.</p>
				7695
				7696	<p>If the trimmed image 'disappears' an warning is produced, and a special
				7697	single pixel transparent 'missed' image is returned, in the same way as when a
				7698	<a href="command-line-options.html#crop">-crop</a> operation 'misses' the image proper. </p>
				7699
				7700
				7701	<div style="margin: auto;">
				7702	<h3 class="magick-header"><a id="type"></a>-type <var>type</var></h3>
				7703	</div>
				7704
				7705	<p class="magick-description">the image type.</p> <p>Choose from: <code>Bilevel</code>,
				7706	<code>Grayscale</code>, <code>GrayscaleMatte</code>, <code>Palette</code>,
				7707	<code>PaletteMatte</code>, <code>TrueColor</code>, <code>TrueColorMatte</code>,
				7708	<code>ColorSeparation</code>, or <code>ColorSeparationMatte</code>.</p>
				7709
				7710	<p>Normally, when a format supports different subformats such as grayscale and
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7711	truecolor, the encoder will try to choose an efficient subformat. The <a
				7712	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]	7713	example, to prevent a JPEG from being written in grayscale format even though
				7714	only gray pixels are present, use.</p>
				7715
				7716	<pre>
				7717	convert bird.png -type TrueColor bird.jpg
				7718	</pre>
				7719
				7720	<p>Similarly, use <a href="command-line-options.html#type">-type TrueColorMatte</a> to force the
				7721	encoder to write an alpha channel even though the image is opaque, if the
				7722	output format supports transparency.</p>
				7723
				7724	<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>
				7725
				7726	<div style="margin: auto;">
				7727	<h3 class="magick-header"><a id="undercolor"></a>-undercolor <var>color</var></h3>
				7728	</div>
				7729
				7730	<p class="magick-description">set the color of the annotation bounding box.</p>
				7731
				7732	<p>The color is specified using the format described under the <a href="command-line-options.html#fill">-fill</a> option.</p>
				7733
				7734	<p>See <a href="command-line-options.html#draw">-draw</a> for further details.</p>
				7735
				7736
				7737	<div style="margin: auto;">
				7738	<h3 class="magick-header"><a id="update"></a>-update <var>seconds</var></h3>
				7739	</div>
				7740
				7741	<p class="magick-description">detect when image file is modified and redisplay.</p>
				7742
				7743	<p>Suppose that while you are displaying an image the file that is currently
				7744	displayed is over-written. <code>display</code> will automagically detect that
				7745	the input file has been changed and update the displayed image
				7746	accordingly.</p>
				7747
				7748
				7749	<div style="margin: auto;">
				7750	<h3 class="magick-header"><a id="unique-colors"></a>-unique-colors</h3>
				7751	</div>
				7752
				7753	<p class="magick-description">discard all but one of any pixel color.</p>
				7754
				7755
				7756	<div style="margin: auto;">
				7757	<h3 class="magick-header"><a id="units"></a>-units <var>type</var></h3>
				7758	</div>
				7759
				7760	<p class="magick-description">the units of image resolution.</p>
				7761
				7762	<p>Choose from: <code>Undefined</code>, <code>PixelsPerInch</code>, or
				7763	<code>PixelsPerCentimeter</code>. This option is normally used in conjunction
				7764	with the <a href="command-line-options.html#density">-density</a> option.</p>
				7765
				7766
				7767	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7768	<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]	7769	</div>
				7770
				7771	<p class="magick-description">sharpen the image with an unsharp mask operator.</p>
				7772
				7773	<p>The <a href="command-line-options.html#unsharp">-unsharp</a> option sharpens an image. The image is
				7774	convolved with a Gaussian operator of the given radius and standard deviation
				7775	(sigma). For reasonable results, radius should be larger than sigma. Use
				7776	a radius of 0 to have the method select a suitable radius.</p>
				7777
				7778	<p>The parameters are:</p>
				7779
				7780	<dl class="dl-horizontal">
				7781	<dt>radius</dt>
				7782	<dd>The radius of the Gaussian, in pixels, not counting the center pixel (default 0).</dd>
				7783	<dt>sigma</dt>
				7784	<dd>The standard deviation of the Gaussian, in pixels (default 1.0).</dd>
				7785	<dt>gain</dt>
				7786	<dd>The fraction of the difference between the original and the blur image that is added back into the original (default 1.0).</dd>
				7787	<dt>threshold</dt>
				7788	<dd>The threshold, as a fraction of <var>QuantumRange</var>, needed to apply the difference amount (default 0.05).</dd>
				7789	</dl>
				7790
				7791	<div style="margin: auto;">
				7792	<h3 class="magick-header"><a id="verbose"></a>-verbose</h3>
				7793	</div>
				7794
				7795	<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>
				7796
				7797
				7798	<div style="margin: auto;">
				7799	<h3 class="magick-header"><a id="version"></a>-version</h3>
				7800	</div>
				7801
				7802	<p class="magick-description">print ImageMagick version string and exit.</p>
				7803
				7804
				7805	<div style="margin: auto;">
				7806	<h3 class="magick-header"><a id="view"></a>-view <var>string</var></h3>
				7807	</div>
				7808
				7809	<p class="magick-description">FlashPix viewing parameters.</p>
				7810
				7811
				7812	<div style="margin: auto;">
				7813	<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>
				7814	</div>
				7815
				7816	<p class="magick-description">soften the edges of the image in vignette style.</p>
				7817
				7818	<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>
				7819
				7820	<div style="margin: auto;">
				7821	<h3 class="magick-header"><a id="virtual-pixel"></a>-virtual-pixel <var>method</var></h3>
				7822	</div>
				7823
				7824	<p class="magick-description">Specify contents of <var>virtual pixels</var>.</p>
				7825
				7826	<p>This option defines what color source should be used if and when a color
				7827	lookup completely 'misses' the source image. The color(s) that appear to
				7828	surround the source image. Generally this color is derived from the source
				7829	image, but could also be set to a specify background color. </p>
				7830
				7831	<p>Choose from these methods:</p>
				7832
				7833	<dl class="dl-horizontal">
				7834	<dt>background</dt><dd>the area surrounding the image is the background color</dd>
				7835	<dt>black</dt><dd>the area surrounding the image is black</dd>
				7836	<dt>checker-tile</dt><dd>alternate squares with image and background color</dd>
				7837	<dt>dither</dt><dd>non-random 32x32 dithered pattern</dd>
				7838	<dt>edge</dt><dd>extend the edge pixel toward infinity</dd>
				7839	<dt>gray</dt><dd>the area surrounding the image is gray</dd>
				7840	<dt>horizontal-tile</dt><dd>horizontally tile the image, background color above/below</dd>
				7841	<dt>horizontal-tile-edge</dt><dd>horizontally tile the image and replicate the side edge pixels</dd>
				7842	<dt>mirror</dt><dd>mirror tile the image</dd>
				7843	<dt>random</dt><dd>choose a random pixel from the image</dd>
				7844	<dt>tile</dt><dd>tile the image (default)</dd>
				7845	<dt>transparent</dt><dd>the area surrounding the image is transparent blackness</dd>
				7846	<dt>vertical-tile</dt><dd>vertically tile the image, sides are background color</dd>
				7847	<dt>vertical-tile-edge</dt><dd>vertically tile the image and replicate the side edge pixels</dd>
				7848	<dt>white</dt><dd>the area surrounding the image is white</dd>
				7849	</dl>
				7850
				7851	<p>The default value is "edge".</p>
				7852
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7853	<p>This most important for distortion operators such as <a href="command-line-options.html#distort"
				7854	>-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]	7855	However it also effects operations that may access pixels just outside the
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7856	image proper, such as <a href="command-line-options.html#convolve">-convolve</a>, <a
				7857	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]	7858
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7859	<p>To print a complete list of virtual pixel types, use the <a
				7860	href="command-line-options.html#list">-list virtual-pixel</a> option.</p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7861
				7862
				7863	<div style="margin: auto;">
				7864	<h3 class="magick-header"><a id="visual"></a>-visual <var>type</var></h3>
				7865	</div>
				7866
				7867	<p class="magick-description">Animate images using this X visual type.", 'animate', 'display'</p>
				7868
				7869	<p>Choose from these visual classes:</p>
				7870
				7871	<pre>
				7872	StaticGray TrueColor
				7873	GrayScale DirectColor
				7874	StaticColor default
				7875	PseudoColor visual id
				7876	</pre>
				7877
				7878	<p>The X server must support the visual you choose, otherwise an error occurs.
				7879	If a visual is not specified, the visual class that can display the most
				7880	simultaneous colors on the default screen is chosen.</p>
				7881
				7882
				7883	<div style="margin: auto;">
				7884	<h3 class="magick-header"><a id="watermark"></a>-watermark <var>brightness</var>x<var>saturation</var></h3>
				7885	</div>
				7886
				7887	<p class="magick-description">Watermark an image using the given percentages of brightness and saturation.</p>
				7888
				7889	<p>Take a grayscale image (with alpha mask) and modify the destination image's
				7890	brightness according to watermark image's grayscale value and the
				7891	<var>brightness</var> percentage. The destinations color saturation
				7892	attribute is just direct modified by the <var>saturation</var>
				7893	percentage, which defaults to 100 percent (no color change). </p>
				7894
				7895
				7896	<div style="margin: auto;">
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7897	<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]	7898	</div>
				7899
				7900	<p class="magick-description">Shear the columns of an image into a sine wave.</p>
				7901
Cristy	e09ed31	2016-03-06 08:07:39 -0500	[diff] [blame]	7902	<div style="margin: auto;">
				7903	<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>
				7904	</div>
				7905
				7906	<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]	7907
				7908	<div style="margin: auto;">
				7909	<h3 class="magick-header"><a id="weight"></a>-weight <var>fontWeight</var></h3>
				7910	</div>
				7911
				7912	<p class="magick-description">Set a font weight for text.</p>
				7913
				7914	<p>This setting suggests a font weight that ImageMagick should try to apply to
				7915	the currently selected font family. Use a positive integer for
				7916	<var>fontWeight</var> or select from the following.</p>
				7917
				7918	<dl class="dl-horizontal">
				7919	<dt>Thin </dt>
				7920	<dd>Same as <var>fontWeight</var> = 100.</dd>
				7921	<dt>ExtraLight </dt>
				7922	<dd>Same as <var>fontWeight</var> = 200.</dd>
				7923	<dt>Light </dt>
				7924	<dd>Same as <var>fontWeight</var> = 300.</dd>
				7925	<dt>Normal </dt>
				7926	<dd>Same as <var>fontWeight</var> = 400.</dd>
				7927	<dt>Medium </dt>
				7928	<dd>Same as <var>fontWeight</var> = 500.</dd>
				7929	<dt>DemiBold </dt>
				7930	<dd>Same as <var>fontWeight</var> = 600.</dd>
				7931	<dt>Bold </dt>
				7932	<dd>Same as <var>fontWeight</var> = 700.</dd>
				7933	<dt>ExtraBold </dt>
				7934	<dd>Same as <var>fontWeight</var> = 800.</dd>
				7935	<dt>Heavy </dt>
				7936	<dd>Same as <var>fontWeight</var> = 900.</dd>
				7937	</dl>
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7938	<br/>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	7939
				7940	<p>To print a complete list of weight types, use <a href="command-line-options.html#list">-list weight</a>.</p>
				7941
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7942	<p>For other settings that affect fonts, see the options <a
				7943	href="command-line-options.html#font">-font</a>, <a href="command-line-options.html#family">-family</a>, <a
				7944	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]	7945
				7946	<div style="margin: auto;">
				7947	<h3 class="magick-header"><a id="white-point"></a>-white-point <var>x,y</var></h3>
				7948	</div>
				7949
				7950	<p class="magick-description">chromaticity white point.</p>
				7951
				7952	<div style="margin: auto;">
				7953	<h3 class="magick-header"><a id="white-threshold"></a>-white-threshold <var>value</var>{<var>%</var>}</h3>
				7954	</div>
				7955
				7956	<p class="magick-description">Force to white all pixels above the threshold while leaving all pixels at or below the threshold unchanged.</p>
				7957
				7958	<p> The threshold value can be given as a percentage or as an absolute integer
				7959	value within [0, <var>QuantumRange</var>] corresponding to the
Cristy	594d277	2015-11-15 10:47:42 -0500	[diff] [blame]	7960	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]	7961
				7962	<div style="margin: auto;">
				7963	<h3 class="magick-header"><a id="window"></a>-window <var>id</var></h3>
				7964	</div>
				7965
				7966	<p class="magick-description">Make the image the background of a window.", 'animate', 'display'</p>
				7967
				7968	<p><var>id</var> can be a window id or name. Specify <code>root</code>
				7969	to select X's root window as the target window.</p>
				7970
				7971	<p>By default the image is tiled onto the background of the target window. If
				7972	<code>backdrop</code> or <a href="command-line-options.html#geometry">-resize</a> are specified, the
				7973	image is surrounded by the background color. Refer to <code>X RESOURCES</code>
				7974	for details.</p>
				7975
				7976	<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]	7977	colors than the target window colormap allows. Use <a
				7978	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]	7979
				7980	<div style="margin: auto;">
				7981	<h3 class="magick-header"><a id="window-group"></a>-window-group</h3>
				7982	</div>
				7983
				7984	<p class="magick-description">specify the window group.</p>
				7985
				7986	<div style="margin: auto;">
				7987	<h3 class="magick-header"><a id="write"></a>-write <var>filename</var></h3>
				7988	</div>
				7989
				7990	<p class="magick-description">write an image sequence.</p>
				7991
				7992	<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>
				7993
				7994	<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]	7995
				7996	<div style="margin: auto;">
				7997	<h3 class="magick-header"><a id="write-mask"></a>-write-mask <var>filename</var></h3>
				7998	</div>
				7999
				8000	<p class="magick-description">Prevent updates to image pixels specified by the mask.</p>
				8001
				8002	<p>This the same as using a mask used for composite masking operations, with
				8003	grayscale values causing blended updates of the image the mask is attached to.
				8004	</p>
				8005
				8006	<p>Use <a href="command-line-options.html#write-mask">+write-mask</a> to remove the mask from images.</p>
				8007
				8008	<p>Also see <a href="command-line-options.html#clip-mask">-clip-mask</a> which work in the same way,
				8009	but with strict boolean masking. </p>
Cristy	882d9f4	2015-10-29 16:48:39 -0400	[diff] [blame]	8010	</div>
				8011	</div>
				8012
				8013
Cristy	e93be68	2015-11-26 09:07:51 -0500	[diff] [blame]	8014
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				8022	<p><a href="command-line-options.html#">Back to top</a> •
cristy	ea2793e	2015-05-31 16:52:26 +0000	[diff] [blame]	8023	<a href="http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x89AB63D48277377A">Public Key</a> •
Cristy	6549abb	2016-11-10 08:25:55 -0500	[diff] [blame]	8024	<a href="https://www.imagemagick.org/script/contact.php">Contact Us</a></p>
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				8028
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