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gerrit-public.fairphone.software / platform / external / ImageMagick / 912a922489051113e98fce817e14ebf2161947e7 / . / www / compare.html
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cristy29dc8652015-05-12 16:26:21 +0000[diff] [blame]5<!DOCTYPE html>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]6<html lang="en">
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]7<head>
cristy29f2c972015-07-28 13:37:46 +0000[diff] [blame]8 <title>ImageMagick: Command-line Tools: Compare</title>
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14 <meta name="description" content="ImageMagick® is a software suite to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats (over 200) including PNG, JPEG, JPEG-2000, GIF, WebP, Postscript, PDF, and SVG. Use ImageMagick to resize, flip, mirror, rotate, distort, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves."/>
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cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]33<body>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]34<div class="main">
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]35<div class="magick-masthead">
36 <div class="container">
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cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]45 <nav class="magick-nav">
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]46 <a class="magick-nav-item " href="../index.html">Home</a>
cristyea2793e2015-05-31 16:52:26 +0000[diff] [blame]47 <a class="magick-nav-item " href="binary-releases.html">Download</a>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]48 <a class="magick-nav-item " href="command-line-tools.html">Tools</a>
Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]49 <a class="magick-nav-item " href="command-line-processing.html">Command-line</a>
cristyea2793e2015-05-31 16:52:26 +0000[diff] [blame]50 <a class="magick-nav-item " href="resources.html">Resources</a>
51 <a class="magick-nav-item " href="api.html">Develop</a>
Cristy1f1f3a02016-06-01 07:25:42 -0400[diff] [blame]52 <a class="magick-nav-item " href="http://www.imagemagick.org/script/search.php">Search</a>
Cristye09ed312016-03-06 08:07:39 -0500[diff] [blame]53 <a class="magick-nav-item pull-right" href="https://www.imagemagick.org/discourse-server/">Community</a>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]54 </nav>
55 </div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]56</div>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]57<div class="container">
58<div class="magick-header">
59<p class="text-center"><a href="compare.html#usage">Example Usage</a> • <a href="compare.html#options">Option Summary</a></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]60
Cristyce4a3552015-12-14 13:53:35 -0500[diff] [blame]61<p class="lead magick-description">Use the <code>compare</code> program to mathematically and visually annotate the difference between an image and its reconstruction. See <a href="command-line-processing.html">Command Line Processing</a> for advice on how to structure your <code>compare</code> command or see below for example usages of the command.</p>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]62
63<h2 class="magick-header"><a id="usage"></a>Example Usage</h2>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]64
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]65<p>We list a few examples of the <code>compare</code> command here to illustrate its usefulness and ease of use. To get started, lets compare an image to one thats been sharpened:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]66
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]67<pre>
68convert rose.jpg -sharpen 0x1 reconstruct.jpg
69compare rose.jpg reconstruct.jpg difference.png
70compare -compose src rose.jpg reconstruct.jpg difference.png
71</pre>
72
73<ul>
Cristy594d2772015-11-15 10:47:42 -0500[diff] [blame]74 <a href="../images/rose.jpg"><img src="../images/rose.jpg" width="70" height="46" alt="rose" /></a>
75 <a href="../images/reconstruct.jpg"><img src="../images/reconstruct.jpg" width="70" height="46" alt="rose" /></a>
76 <img style="margin:13px 0;" src="../images/right.gif" width="20" height="20" alt="==>" />
77 <a href="../images/difference.png"><img src="../images/difference.png" width="70" height="46" alt="rose" /></a>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]78</ul>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]79
80<p>The red areas of the difference image emphasizes (highlight) pixels that are affected by the image sharpening, whereas white de-emphasizes (lowlight) pixels that are untouched by the sharpening process.</p>
81
82<p>In addition to the visual interpretation of the difference in an image and its reconstruction, we report a mathematical measure of the difference:</p>
83
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]84<pre>
Cristy594d2772015-11-15 10:47:42 -0500[diff] [blame]85-> compare -verbose -metric mae rose.jpg reconstruct.jpg difference.png
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]86Image: rose.jpg
87 Channel distortion: MAE
88 red: 2282.91 (0.034835)
89 green: 1853.99 (0.0282901)
90 blue: 2008.67 (0.0306503)
91 all: 1536.39 (0.0234439)
92</pre>
93<p>Or, if you just want the red channel distortion, use this command:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]94
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]95<pre>
Cristy594d2772015-11-15 10:47:42 -0500[diff] [blame]96-> compare -channel red -metric PSNR rose.jpg reconstruct.jpg difference.png
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]9719.63
98</pre>
99
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]100<p>Or, if you just want the overall image distortion, use this command:</p>
101
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]102<pre>
Cristy594d2772015-11-15 10:47:42 -0500[diff] [blame]103-> compare -metric PSNR rose.jpg reconstruct.jpg difference.png
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]10428.31
105</pre>
106
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]107<p>If the reconstructed image is a subimage of the image, the compare program returns the best match offset. In addition, it returns a similarity image such that an exact match location is completely white and if none of the pixels match, black, otherwise some gray level in-between:</p>
108
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]109<pre>
Cristy594d2772015-11-15 10:47:42 -0500[diff] [blame]110-> compare -metric RMSE -subimage-search logo.png wizard.jpg similarity.gif
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]11185.05 (0.00129778) @ 353,157
112</pre>
113
Cristyce4a3552015-12-14 13:53:35 -0500[diff] [blame]114<p>You can find additional examples of using <code>compare</code> in <a href="http://www.ibm.com/developerworks/library/l-graf/?ca=dnt-428">Graphics from the Command Line</a>. Further discussion is available in <a href="http://www.ibm.com/developerworks/library/l-graf2/?ca=dgr-lnxw15GraphicsLine">More Graphics from the Command Line</a> and <a href="http://www.imagemagick.org/Usage/">Examples of ImageMagick Usage</a>.</p>
cristyf1b8a092014-02-20 15:46:11 +0000[diff] [blame]115
116<p>The compare program returns 2 on error otherwise 0 if the images are similar or 1 if they are dissimilar.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]117
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]118<h2 class="magick-header"><a id="options"></a>Option Summary</h2>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]119
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]120<p>The <code>compare</code> command recognizes these options. Click on an option to get more details about how that option works.</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]121
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]122<table class="table table-condensed table-striped">
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]123 <tbody>
124 <tr>
125 <th align="left">Option</th>
126 <th align="left">Description</th>
127 </tr>
128
129 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]130 <td><a href="command-line-options.html#alpha">-alpha</a></td>
131 <td>on, activate, off, deactivate, set, opaque, copy",
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]132transparent, extract, background, or shape the alpha channel</td>
133 </tr>
134
135 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]136 <td><a href="command-line-options.html#authenticate">-authenticate <var>value</var></a></td>
137 <td>decrypt image with this password</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]138 </tr>
139
140 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]141 <td><a href="command-line-options.html#channel">-channel <var>type</var></a></td>
142 <td>apply option to select image channels</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]143 </tr>
144
145 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]146 <td><a href="command-line-options.html#colorspace">-colorspace <var>type</var></a></td>
147 <td>set image colorspace</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]148 </tr>
149
150 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]151 <td><a href="command-line-options.html#compose">-compose <var>operator</var></a></td>
152 <td>set image composite operator</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]153 </tr>
154
155 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]156 <td><a href="command-line-options.html#decipher">-decipher <var>filename</var></a></td>
157 <td>convert cipher pixels to plain</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]158 </tr>
159
160 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]161 <td><a href="command-line-options.html#debug">-debug <var>events</var></a></td>
162 <td>display copious debugging information</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]163 </tr>
164
165 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]166 <td><a href="command-line-options.html#define">-define <var>format:option</var></a></td>
167 <td>define one or more image format options</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]168 </tr>
169
170 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]171 <td><a href="command-line-options.html#density">-density <var>geometry</var></a></td>
172 <td>horizontal and vertical density of the image</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]173 </tr>
174
175 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]176 <td><a href="command-line-options.html#depth">-depth <var>value</var></a></td>
177 <td>image depth</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]178 </tr>
179
180 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]181 <td><a href="command-line-options.html#dissimilarity-threshold">-dissimilarity-threshold <var>value</var></a></td>
182 <td>maximum distortion for (sub)image match (default 0.2)</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]183 </tr>
184
185 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]186 <td><a href="command-line-options.html#encipher">-encipher <var>filename</var></a></td>
187 <td>convert plain pixels to cipher pixels</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]188 </tr>
189
190 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]191 <td><a href="command-line-options.html#extract">-extract <var>geometry</var></a></td>
192 <td>extract area from image</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]193 </tr>
194
195 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]196 <td><a href="command-line-options.html#fuzz">-fuzz <var>distance</var></a></td>
197 <td>colors within this distance are considered equal</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]198 </tr>
199
200 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]201 <td><a href="command-line-options.html#help">-help</a></td>
202 <td>print program options</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]203 </tr>
204
205 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]206 <td><a href="command-line-options.html#highlight-color">-highlight-color <var>color</var></a></td>
207 <td>emphasize pixel differences with this color</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]208 </tr>
209
210 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]211 <td><a href="command-line-options.html#identify">-identify</a></td>
212 <td>identify the format and characteristics of the image</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]213 </tr>
214
215 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]216 <td><a href="command-line-options.html#interlace">-interlace <var>type</var></a></td>
217 <td>type of image interlacing scheme</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]218 </tr>
219
220 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]221 <td><a href="command-line-options.html#limit">-limit <var>type value</var></a></td>
222 <td>pixel cache resource limit</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]223 </tr>
224
225 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]226 <td><a href="command-line-options.html#log">-log <var>format</var></a></td>
227 <td>format of debugging information</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]228 </tr>
229
230 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]231 <td><a href="command-line-options.html#lowlight-color">-lowlight-color <var>color</var></a></td>
232 <td>de-emphasize pixel differences with this color</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]233 </tr>
234
235 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]236 <td><a href="command-line-options.html#metric">-metric <var>type</var></a></td>
237 <td>measure differences between images with this metric</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]238 </tr>
239
240 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]241 <td><a href="command-line-options.html#profile">-profile <var>filename</var></a></td>
242 <td>add, delete, or apply an image profile</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]243 </tr>
244
245 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]246 <td><a href="command-line-options.html#quality">-quality <var>value</var></a></td>
247 <td>JPEG/MIFF/PNG compression level</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]248 </tr>
249
250 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]251 <td><a href="command-line-options.html#quantize">-quantize <var>colorspace</var></a></td>
252 <td>reduce image colors in this colorspace</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]253 </tr>
254
255 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]256 <td><a href="command-line-options.html#quiet">-quiet</a></td>
257 <td>suppress all warning messages</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]258 </tr>
259
260 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]261 <td><a href="command-line-options.html#regard-warnings">-regard-warnings</a></td>
262 <td>pay attention to warning messages.</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]263 </tr>
264
265 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]266 <td><a href="command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
267 <td>settings remain in effect until parenthesis boundary.</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]268 </tr>
269
270 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]271 <td><a href="command-line-options.html#sampling-factor">-sampling-factor <var>geometry</var></a></td>
272 <td>horizontal and vertical sampling factor</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]273 </tr>
274
275 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]276 <td><a href="command-line-options.html#seed">-seed <var>value</var></a></td>
277 <td>seed a new sequence of pseudo-random numbers</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]278 </tr>
279
280 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]281 <td><a href="command-line-options.html#set">-set <var>attribute value</var></a></td>
282 <td>set an image attribute</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]283 </tr>
284
285 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]286 <td><a href="command-line-options.html#similarity-threshold">-similarity-threshold <var>value</var></a></td>
287 <td>minimum distortion for (sub)image match (default 0.0)</td>
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]288 </tr>
289
290 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]291 <td><a href="command-line-options.html#size">-size <var>geometry</var></a></td>
292 <td>width and height of image</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]293 </tr>
294
295 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]296 <td><a href="command-line-options.html#subimage-search">-subimage-search</a></td>
297 <td>search for subimage</td>
cristyae6203d2010-08-09 01:12:14 +0000[diff] [blame]298 </tr>
299
300 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]301 <td><a href="command-line-options.html#synchronize">-synchronize</a></td>
302 <td>synchronize image to storage device</td>
cristy5063d812010-10-19 16:28:10 +0000[diff] [blame]303 </tr>
304
305 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]306 <td><a href="command-line-options.html#taint">-taint</a></td>
307 <td>mark the image as modified</td>
cristy5063d812010-10-19 16:28:10 +0000[diff] [blame]308 </tr>
309
310 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]311 <td><a href="command-line-options.html#transparent-color">-transparent-color <var>color</var></a></td>
312 <td>transparent color</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]313 </tr>
314
315 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]316 <td><a href="command-line-options.html#verbose">-verbose</a></td>
317 <td>print detailed information about the image</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]318 </tr>
319
320 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]321 <td><a href="command-line-options.html#version">-version</a></td>
322 <td>print version information</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]323 </tr>
324
325 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]326 <td><a href="command-line-options.html#virtual-pixel">-virtual-pixel <var>method</var></a></td>
327 <td>access method for pixels outside the boundaries of the image</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]328 </tr>
329
330 </tbody>
331</table>
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