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gerrit-public.fairphone.software / platform / external / ImageMagick / 689efa2792fc00b3418a812abcdc9bb76e5293b0 / . / www / compare.html
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cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]174<h1>ImageMagick Compare Command-line Tool</h1>
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame]175<p class="navigation-index">[<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]176
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]177<div class="doc-section">
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]178<p>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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]179</div>
180
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]181<h2><a id="usage"></a>Example Usage</h2>
182<div class="doc-section">
183
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]184<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]185
cristyf1b8a092014-02-20 15:46:11 +0000[diff] [blame]186<p class="crt"><span class="crtprompt"> $magick&gt; </span><span class="crtin">convert rose.jpg -sharpen 0x1 reconstruct.jpg</span><span class="crtout"></span><span class="crtprompt"> $magick&gt; </span><span class="crtin">compare rose.jpg reconstruct.jpg difference.png</span><span class="crtout"></span><span class="crtprompt"> $magick&gt; </span><span class="crtin">compare -compose src rose.jpg reconstruct.jpg difference.png</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]187<div class="image">
188<p>
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame]189 <a href="../images/rose.jpg"><img src="../images/rose.jpg" width="70" height="46" alt="rose"></img></a>
190 <a href="../images/reconstruct.jpg"><img src="../images/reconstruct.jpg" width="70" height="46" alt="rose"></img></a>
191 <img style="margin:13px 0;" src="../images/right.gif" width="20" height="20" alt="==&gt;"></img>
192 <a href="../images/difference.png"><img src="../images/difference.png" width="70" height="46" alt="rose"></img></a>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]193</p>
194</div>
195
196<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>
197
198<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>
199
cristyf1b8a092014-02-20 15:46:11 +0000[diff] [blame]200<p class="crt"><span class="crtprompt"> $magick&gt; </span><span class="crtin">compare -verbose -metric mae rose.jpg reconstruct.jpg difference.png</span><span class="crtout">Image: rose.jpg <br></br>
cristy417eeb12013-07-28 18:48:22 +0000[diff] [blame]201 Channel distortion: MAE <br></br>
202 red: 2282.91 (0.034835) <br></br>
203 green: 1853.99 (0.0282901) <br></br>
204 blue: 2008.67 (0.0306503) <br></br>
205 all: 1536.39 (0.0234439) <br></br></span></p><p>Or, if you just want the red channel distortion, use this command:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]206
cristyf1b8a092014-02-20 15:46:11 +0000[diff] [blame]207<p class="crt"><span class="crtprompt"> $magick&gt; </span><span class="crtin">compare -channel red -metric PSNR rose.jpg reconstruct.jpg difference.png</span><span class="crtout">19.63</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]208<p>Or, if you just want the overall image distortion, use this command:</p>
209
cristyf1b8a092014-02-20 15:46:11 +0000[diff] [blame]210<p class="crt"><span class="crtprompt"> $magick&gt; </span><span class="crtin">compare -metric PSNR rose.jpg reconstruct.jpg difference.png</span><span class="crtout">28.31</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]211<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>
212
cristyf1b8a092014-02-20 15:46:11 +0000[diff] [blame]213<p class="crt"><span class="crtprompt"> $magick&gt; </span><span class="crtin">compare -metric RMSE -subimage-search logo.png wizard.jpg similarity.gif</span><span class="crtout">85.05 (0.00129778) @ 353,157</span></p>
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]214<p>You can find additional examples of using <code>compare</code> in <a href="http://www-106.ibm.com/developerworks/library/l-graf/?ca=dnt-428">Graphics from the Command Line</a>. Further discussion is available in <a href="http://www-106.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]215
216<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]217</div>
218
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]219<h2><a id="options"></a>Option Summary</h2>
220<div class="doc-section">
221
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]222<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]223
224<table class="doc">
225 <tbody>
226 <tr>
227 <th align="left">Option</th>
228 <th align="left">Description</th>
229 </tr>
230
231 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]232 <td valign="top"><a href="command-line-options.html#alpha">-alpha</a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]233 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
234transparent, extract, background, or shape the alpha channel</td>
235 </tr>
236
237 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]238 <td valign="top"><a href="command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]239 <td valign="top">decrypt image with this password</td>
240 </tr>
241
242 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]243 <td valign="top"><a href="command-line-options.html#channel">-channel <em class="option">type</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]244 <td valign="top">apply option to select image channels</td>
245 </tr>
246
247 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]248 <td valign="top"><a href="command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]249 <td valign="top">set image colorspace</td>
250 </tr>
251
252 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]253 <td valign="top"><a href="command-line-options.html#compose">-compose <em class="option">operator</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]254 <td valign="top">set image composite operator</td>
255 </tr>
256
257 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]258 <td valign="top"><a href="command-line-options.html#decipher">-decipher <em class="option">filename</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]259 <td valign="top">convert cipher pixels to plain</td>
260 </tr>
261
262 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]263 <td valign="top"><a href="command-line-options.html#debug">-debug <em class="option">events</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]264 <td valign="top">display copious debugging information</td>
265 </tr>
266
267 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]268 <td valign="top"><a href="command-line-options.html#define">-define <em class="option">format:option</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]269 <td valign="top">define one or more image format options</td>
270 </tr>
271
272 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]273 <td valign="top"><a href="command-line-options.html#density">-density <em class="option">geometry</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]274 <td valign="top">horizontal and vertical density of the image</td>
275 </tr>
276
277 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]278 <td valign="top"><a href="command-line-options.html#depth">-depth <em class="option">value</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]279 <td valign="top">image depth</td>
280 </tr>
281
282 <tr>
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]283 <td valign="top"><a href="command-line-options.html#dissimilarity-threshold">-dissimilarity-threshold <em class="option">value</em></a></td>
cristy771f7a72010-11-27 21:42:59 +0000[diff] [blame]284 <td valign="top">maximum distortion for (sub)image match (default 0.2)</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]285 </tr>
286
287 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]288 <td valign="top"><a href="command-line-options.html#encipher">-encipher <em class="option">filename</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]289 <td valign="top">convert plain pixels to cipher pixels</td>
290 </tr>
291
292 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]293 <td valign="top"><a href="command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]294 <td valign="top">extract area from image</td>
295 </tr>
296
297 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]298 <td valign="top"><a href="command-line-options.html#fuzz">-fuzz <em class="option">distance</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]299 <td valign="top">colors within this distance are considered equal</td>
300 </tr>
301
302 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]303 <td valign="top"><a href="command-line-options.html#help">-help</a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]304 <td valign="top">print program options</td>
305 </tr>
306
307 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]308 <td valign="top"><a href="command-line-options.html#highlight-color">-highlight-color <em class="option">color</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]309 <td valign="top">emphasize pixel differences with this color</td>
310 </tr>
311
312 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]313 <td valign="top"><a href="command-line-options.html#identify">-identify</a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]314 <td valign="top">identify the format and characteristics of the image</td>
315 </tr>
316
317 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]318 <td valign="top"><a href="command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]319 <td valign="top">type of image interlacing scheme</td>
320 </tr>
321
322 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]323 <td valign="top"><a href="command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]324 <td valign="top">pixel cache resource limit</td>
325 </tr>
326
327 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]328 <td valign="top"><a href="command-line-options.html#log">-log <em class="option">format</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]329 <td valign="top">format of debugging information</td>
330 </tr>
331
332 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]333 <td valign="top"><a href="command-line-options.html#lowlight-color">-lowlight-color <em class="option">color</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]334 <td valign="top">de-emphasize pixel differences with this color</td>
335 </tr>
336
337 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]338 <td valign="top"><a href="command-line-options.html#metric">-metric <em class="option">type</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]339 <td valign="top">measure differences between images with this metric</td>
340 </tr>
341
342 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]343 <td valign="top"><a href="command-line-options.html#profile">-profile <em class="option">filename</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]344 <td valign="top">add, delete, or apply an image profile</td>
345 </tr>
346
347 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]348 <td valign="top"><a href="command-line-options.html#quality">-quality <em class="option">value</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]349 <td valign="top">JPEG/MIFF/PNG compression level</td>
350 </tr>
351
352 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]353 <td valign="top"><a href="command-line-options.html#quantize">-quantize <em class="option">colorspace</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]354 <td valign="top">reduce image colors in this colorspace</td>
355 </tr>
356
357 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]358 <td valign="top"><a href="command-line-options.html#quiet">-quiet</a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]359 <td valign="top">suppress all warning messages</td>
360 </tr>
361
362 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]363 <td valign="top"><a href="command-line-options.html#regard-warnings">-regard-warnings</a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]364 <td valign="top">pay attention to warning messages.</td>
365 </tr>
366
367 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]368 <td valign="top"><a href="command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]369 <td valign="top">settings remain in effect until parenthesis boundary.</td>
370 </tr>
371
372 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]373 <td valign="top"><a href="command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]374 <td valign="top">horizontal and vertical sampling factor</td>
375 </tr>
376
377 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]378 <td valign="top"><a href="command-line-options.html#seed">-seed <em class="option">value</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]379 <td valign="top">seed a new sequence of pseudo-random numbers</td>
380 </tr>
381
382 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]383 <td valign="top"><a href="command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]384 <td valign="top">set an image attribute</td>
385 </tr>
386
387 <tr>
cristy8ee7f242013-06-20 16:08:44 +0000[diff] [blame]388 <td valign="top"><a href="command-line-options.html#similarity-threshold">-similarity-threshold <em class="option">value</em></a></td>
389 <td valign="top">minimum distortion for (sub)image match (default 0.0)</td>
390 </tr>
391
392 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]393 <td valign="top"><a href="command-line-options.html#size">-size <em class="option">geometry</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]394 <td valign="top">width and height of image</td>
395 </tr>
396
397 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]398 <td valign="top"><a href="command-line-options.html#subimage-search">-subimage-search</a></td>
cristyae6203d2010-08-09 01:12:14 +0000[diff] [blame]399 <td valign="top">search for subimage</td>
400 </tr>
401
402 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]403 <td valign="top"><a href="command-line-options.html#synchronize">-synchronize</a></td>
cristy5063d812010-10-19 16:28:10 +0000[diff] [blame]404 <td valign="top">synchronize image to storage device</td>
405 </tr>
406
407 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]408 <td valign="top"><a href="command-line-options.html#taint">-taint</a></td>
cristy5063d812010-10-19 16:28:10 +0000[diff] [blame]409 <td valign="top">mark the image as modified</td>
410 </tr>
411
412 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]413 <td valign="top"><a href="command-line-options.html#transparent-color">-transparent-color <em class="option">color</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]414 <td valign="top">transparent color</td>
415 </tr>
416
417 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]418 <td valign="top"><a href="command-line-options.html#verbose">-verbose</a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]419 <td valign="top">print detailed information about the image</td>
420 </tr>
421
422 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]423 <td valign="top"><a href="command-line-options.html#version">-version</a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]424 <td valign="top">print version information</td>
425 </tr>
426
427 <tr>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]428 <td valign="top"><a href="command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]429 <td valign="top">access method for pixels outside the boundaries of the image</td>
430 </tr>
431
432 </tbody>
433</table>
cristy751980d2012-06-03 23:18:35 +0000[diff] [blame]434</div>
cristyad41c0c2012-10-31 00:49:28 +0000[diff] [blame]435
436</div>
437
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443 <a href="../discourse-server">Discourse Server</a> •
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cristyf1b8a092014-02-20 15:46:11 +0000[diff] [blame]450 <span id="footer-west">© 1999-2013 ImageMagick Studio LLC</span>
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