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gerrit-public.fairphone.software / platform / external / ImageMagick / bc2324230ed07ca8a112118d1b867aa8185181bc / . / www / compare.html
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Cristy6549abb2016-11-10 08:25:55 -0500[diff] [blame]11 <title>Command-line Tools: Compare @ ImageMagick</title>
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13 <meta name="application-name" content="ImageMagick"/>
14 <meta name="description" content="ImageMagick® is a software suite to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats (over 200) including PNG, JPEG, JPEG-2000, GIF, WebP, Postscript, PDF, and SVG. Use ImageMagick to resize, flip, mirror, rotate, distort, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves."/>
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cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]35<div class="main">
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]36<div class="magick-masthead">
37 <div class="container">
Cristy6549abb2016-11-10 08:25:55 -0500[diff] [blame]38 <script async="async" src="http://localhost/pagead/js/adsbygoogle.js"></script> <ins class="adsbygoogle"
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cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]46 <nav class="magick-nav">
cristy44443b92015-05-05 00:06:07 +0000[diff] [blame]47 <a class="magick-nav-item " href="../index.html">Home</a>
cristyea2793e2015-05-31 16:52:26 +0000[diff] [blame]48 <a class="magick-nav-item " href="binary-releases.html">Download</a>
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Cristye93be682015-11-26 09:07:51 -0500[diff] [blame]50 <a class="magick-nav-item " href="command-line-processing.html">Command-line</a>
cristyea2793e2015-05-31 16:52:26 +0000[diff] [blame]51 <a class="magick-nav-item " href="resources.html">Resources</a>
52 <a class="magick-nav-item " href="api.html">Develop</a>
Cristy6549abb2016-11-10 08:25:55 -0500[diff] [blame]53 <a class="magick-nav-item " href="https://www.imagemagick.org/script/search.php">Search</a>
54 <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]55 </nav>
56 </div>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]57</div>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]58<div class="container">
59<div class="magick-header">
60<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]61
Cristyce4a3552015-12-14 13:53:35 -0500[diff] [blame]62<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]63
64<h2 class="magick-header"><a id="usage"></a>Example Usage</h2>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]65
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]66<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]67
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]68<pre>
69convert rose.jpg -sharpen 0x1 reconstruct.jpg
70compare rose.jpg reconstruct.jpg difference.png
71compare -compose src rose.jpg reconstruct.jpg difference.png
72</pre>
73
74<ul>
Cristy594d2772015-11-15 10:47:42 -0500[diff] [blame]75 <a href="../images/rose.jpg"><img src="../images/rose.jpg" width="70" height="46" alt="rose" /></a>
76 <a href="../images/reconstruct.jpg"><img src="../images/reconstruct.jpg" width="70" height="46" alt="rose" /></a>
77 <img style="margin:13px 0;" src="../images/right.gif" width="20" height="20" alt="==>" />
78 <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]79</ul>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]80
81<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>
82
83<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>
84
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]85<pre>
Cristy594d2772015-11-15 10:47:42 -0500[diff] [blame]86-> compare -verbose -metric mae rose.jpg reconstruct.jpg difference.png
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]87Image: rose.jpg
88 Channel distortion: MAE
89 red: 2282.91 (0.034835)
90 green: 1853.99 (0.0282901)
91 blue: 2008.67 (0.0306503)
92 all: 1536.39 (0.0234439)
93</pre>
94<p>Or, if you just want the red channel distortion, use this command:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]95
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]96<pre>
Cristy594d2772015-11-15 10:47:42 -0500[diff] [blame]97-> compare -channel red -metric PSNR rose.jpg reconstruct.jpg difference.png
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]9819.63
99</pre>
100
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]101<p>Or, if you just want the overall image distortion, use this command:</p>
102
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]103<pre>
Cristy594d2772015-11-15 10:47:42 -0500[diff] [blame]104-> compare -metric PSNR rose.jpg reconstruct.jpg difference.png
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]10528.31
106</pre>
107
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]108<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>
109
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]110<pre>
Cristy594d2772015-11-15 10:47:42 -0500[diff] [blame]111-> compare -metric RMSE -subimage-search logo.png wizard.jpg similarity.gif
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]11285.05 (0.00129778) @ 353,157
113</pre>
114
Cristy364a72f2016-11-04 22:38:41 -0400[diff] [blame]115<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="https://www.imagemagick.org/Usage/">Examples of ImageMagick Usage</a>.</p>
cristyf1b8a092014-02-20 15:46:11 +0000[diff] [blame]116
117<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]118
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]119<h2 class="magick-header"><a id="options"></a>Option Summary</h2>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]120
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]121<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]122
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]123<table class="table table-condensed table-striped">
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]124 <tbody>
125 <tr>
126 <th align="left">Option</th>
127 <th align="left">Description</th>
128 </tr>
129
130 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]131 <td><a href="command-line-options.html#alpha">-alpha</a></td>
132 <td>on, activate, off, deactivate, set, opaque, copy",
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]133transparent, extract, background, or shape the alpha channel</td>
134 </tr>
135
136 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]137 <td><a href="command-line-options.html#authenticate">-authenticate <var>value</var></a></td>
138 <td>decrypt image with this password</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]139 </tr>
140
141 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]142 <td><a href="command-line-options.html#channel">-channel <var>type</var></a></td>
143 <td>apply option to select image channels</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]144 </tr>
145
146 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]147 <td><a href="command-line-options.html#colorspace">-colorspace <var>type</var></a></td>
148 <td>set image colorspace</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]149 </tr>
150
151 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]152 <td><a href="command-line-options.html#compose">-compose <var>operator</var></a></td>
153 <td>set image composite operator</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]154 </tr>
155
156 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]157 <td><a href="command-line-options.html#decipher">-decipher <var>filename</var></a></td>
158 <td>convert cipher pixels to plain</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]159 </tr>
160
161 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]162 <td><a href="command-line-options.html#debug">-debug <var>events</var></a></td>
163 <td>display copious debugging information</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]164 </tr>
165
166 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]167 <td><a href="command-line-options.html#define">-define <var>format:option</var></a></td>
168 <td>define one or more image format options</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]169 </tr>
170
171 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]172 <td><a href="command-line-options.html#density">-density <var>geometry</var></a></td>
173 <td>horizontal and vertical density of the image</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]174 </tr>
175
176 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]177 <td><a href="command-line-options.html#depth">-depth <var>value</var></a></td>
178 <td>image depth</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]179 </tr>
180
181 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]182 <td><a href="command-line-options.html#dissimilarity-threshold">-dissimilarity-threshold <var>value</var></a></td>
183 <td>maximum distortion for (sub)image match (default 0.2)</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]184 </tr>
185
186 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]187 <td><a href="command-line-options.html#encipher">-encipher <var>filename</var></a></td>
188 <td>convert plain pixels to cipher pixels</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]189 </tr>
190
191 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]192 <td><a href="command-line-options.html#extract">-extract <var>geometry</var></a></td>
193 <td>extract area from image</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]194 </tr>
195
196 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]197 <td><a href="command-line-options.html#fuzz">-fuzz <var>distance</var></a></td>
198 <td>colors within this distance are considered equal</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]199 </tr>
200
201 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]202 <td><a href="command-line-options.html#help">-help</a></td>
203 <td>print program options</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]204 </tr>
205
206 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]207 <td><a href="command-line-options.html#highlight-color">-highlight-color <var>color</var></a></td>
208 <td>emphasize pixel differences with this color</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]209 </tr>
210
211 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]212 <td><a href="command-line-options.html#identify">-identify</a></td>
213 <td>identify the format and characteristics of the image</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]214 </tr>
215
216 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]217 <td><a href="command-line-options.html#interlace">-interlace <var>type</var></a></td>
218 <td>type of image interlacing scheme</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]219 </tr>
220
221 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]222 <td><a href="command-line-options.html#limit">-limit <var>type value</var></a></td>
223 <td>pixel cache resource limit</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]224 </tr>
225
226 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]227 <td><a href="command-line-options.html#log">-log <var>format</var></a></td>
228 <td>format of debugging information</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]229 </tr>
230
231 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]232 <td><a href="command-line-options.html#lowlight-color">-lowlight-color <var>color</var></a></td>
233 <td>de-emphasize pixel differences with this color</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]234 </tr>
235
236 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]237 <td><a href="command-line-options.html#metric">-metric <var>type</var></a></td>
238 <td>measure differences between images with this metric</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]239 </tr>
240
241 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]242 <td><a href="command-line-options.html#profile">-profile <var>filename</var></a></td>
243 <td>add, delete, or apply an image profile</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]244 </tr>
245
246 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]247 <td><a href="command-line-options.html#quality">-quality <var>value</var></a></td>
248 <td>JPEG/MIFF/PNG compression level</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]249 </tr>
250
251 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]252 <td><a href="command-line-options.html#quantize">-quantize <var>colorspace</var></a></td>
253 <td>reduce image colors in this colorspace</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]254 </tr>
255
256 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]257 <td><a href="command-line-options.html#quiet">-quiet</a></td>
258 <td>suppress all warning messages</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]259 </tr>
260
261 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]262 <td><a href="command-line-options.html#regard-warnings">-regard-warnings</a></td>
263 <td>pay attention to warning messages.</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]264 </tr>
265
266 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]267 <td><a href="command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
268 <td>settings remain in effect until parenthesis boundary.</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]269 </tr>
270
271 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]272 <td><a href="command-line-options.html#sampling-factor">-sampling-factor <var>geometry</var></a></td>
273 <td>horizontal and vertical sampling factor</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]274 </tr>
275
276 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]277 <td><a href="command-line-options.html#seed">-seed <var>value</var></a></td>
278 <td>seed a new sequence of pseudo-random numbers</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]279 </tr>
280
281 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]282 <td><a href="command-line-options.html#set">-set <var>attribute value</var></a></td>
283 <td>set an image attribute</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]284 </tr>
285
286 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]287 <td><a href="command-line-options.html#similarity-threshold">-similarity-threshold <var>value</var></a></td>
288 <td>minimum distortion for (sub)image match (default 0.0)</td>
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]289 </tr>
290
291 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]292 <td><a href="command-line-options.html#size">-size <var>geometry</var></a></td>
293 <td>width and height of image</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]294 </tr>
295
296 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]297 <td><a href="command-line-options.html#subimage-search">-subimage-search</a></td>
298 <td>search for subimage</td>
cristyae6203d2010-08-09 01:12:14 +0000[diff] [blame]299 </tr>
300
301 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]302 <td><a href="command-line-options.html#synchronize">-synchronize</a></td>
303 <td>synchronize image to storage device</td>
cristy5063d812010-10-19 16:28:10 +0000[diff] [blame]304 </tr>
305
306 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]307 <td><a href="command-line-options.html#taint">-taint</a></td>
308 <td>mark the image as modified</td>
cristy5063d812010-10-19 16:28:10 +0000[diff] [blame]309 </tr>
310
311 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]312 <td><a href="command-line-options.html#transparent-color">-transparent-color <var>color</var></a></td>
313 <td>transparent color</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]314 </tr>
315
316 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]317 <td><a href="command-line-options.html#verbose">-verbose</a></td>
318 <td>print detailed information about the image</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]319 </tr>
320
321 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]322 <td><a href="command-line-options.html#version">-version</a></td>
323 <td>print version information</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]324 </tr>
325
326 <tr>
cristyd2432012015-05-04 23:15:15 +0000[diff] [blame]327 <td><a href="command-line-options.html#virtual-pixel">-virtual-pixel <var>method</var></a></td>
328 <td>access method for pixels outside the boundaries of the image</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]329 </tr>
330
331 </tbody>
332</table>
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