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cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]219<h1>ImageMagick Compare Command-line Tool</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]220<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
221
222<p>Use the <kbd>compare</kbd> program to mathematically and visually annotate the difference between an image and its reconstruction. See <a href="../www/command-line-processing.html">Command Line Processing</a> for advice on how to structure your <kbd>compare</kbd> command or see below for example usages of the command.</p>
223
224<div style="margin: auto;">
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]225 <h2><a id="usage"></a>Example Usage</h2>
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227
228<p>We list a few examples of the <kbd>compare</kbd> command here to illustrate its usefulness and ease of use. To get started, lets compare an image to one thats been sharpened:</p>
229
230<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>
231<div class="image">
232<p>
233 <a href="../images/rose.jpg"><img src="../images/rose.jpg" width="70" height="46" alt="rose" /></a>
234 <a href="../images/reconstruct.jpg"><img src="../images/reconstruct.jpg" width="70" height="46" alt="rose" /></a>
235 <img style="margin:13px 0;" src="../images/right.gif" width="20" height="20" alt="==>" />
236 <a href="../images/difference.png"><img src="../images/difference.png" width="70" height="46" alt="rose" /></a>
237</p>
238</div>
239
240<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>
241
242<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>
243
244<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/>
245 Channel distortion: MAE <br/>
246 red: 2282.91 (0.034835) <br/>
247 green: 1853.99 (0.0282901) <br/>
248 blue: 2008.67 (0.0306503) <br/>
249 all: 1536.39 (0.0234439) <br/></span></p><p>Or, if you just want the red channel distortion, use this command:</p>
250
251<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>
252<p>Or, if you just want the overall image distortion, use this command:</p>
253
254<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>
255<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>
256
cristyc8ad01f2010-08-20 22:41:04 +0000[diff] [blame]257<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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]258<p>You can find additional examples of using <kbd>compare</kbd> 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>
259
260<div style="margin: auto;">
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]261 <h2><a id="options"></a>Option Summary</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]262</div>
263
264<p>The <kbd>compare</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
265
266<table class="doc">
267 <tbody>
268 <tr>
269 <th align="left">Option</th>
270 <th align="left">Description</th>
271 </tr>
272
273 <tr>
274 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
275 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
276transparent, extract, background, or shape the alpha channel</td>
277 </tr>
278
279 <tr>
280 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
281 <td valign="top">decrypt image with this password</td>
282 </tr>
283
284 <tr>
285 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
286 <td valign="top">apply option to select image channels</td>
287 </tr>
288
289 <tr>
290 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
291 <td valign="top">set image colorspace</td>
292 </tr>
293
294 <tr>
295 <td valign="top"><a href="../www/command-line-options.html#compose">-compose <em class="option">operator</em></a></td>
296 <td valign="top">set image composite operator</td>
297 </tr>
298
299 <tr>
300 <td valign="top"><a href="../www/command-line-options.html#decipher">-decipher <em class="option">filename</em></a></td>
301 <td valign="top">convert cipher pixels to plain</td>
302 </tr>
303
304 <tr>
305 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
306 <td valign="top">display copious debugging information</td>
307 </tr>
308
309 <tr>
310 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
311 <td valign="top">define one or more image format options</td>
312 </tr>
313
314 <tr>
315 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
316 <td valign="top">horizontal and vertical density of the image</td>
317 </tr>
318
319 <tr>
320 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
321 <td valign="top">image depth</td>
322 </tr>
323
324 <tr>
325 <td valign="top"><a href="../www/command-line-options.html#disimilarity-threshold">-disimilarity-threshold <em class="option">value</em></a></td>
cristy771f7a72010-11-27 21:42:59 +0000[diff] [blame]326 <td valign="top">maximum distortion for (sub)image match (default 0.2)</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]327 </tr>
328
329 <tr>
330 <td valign="top"><a href="../www/command-line-options.html#encipher">-encipher <em class="option">filename</em></a></td>
331 <td valign="top">convert plain pixels to cipher pixels</td>
332 </tr>
333
334 <tr>
335 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
336 <td valign="top">extract area from image</td>
337 </tr>
338
339 <tr>
340 <td valign="top"><a href="../www/command-line-options.html#fuzz">-fuzz <em class="option">distance</em></a></td>
341 <td valign="top">colors within this distance are considered equal</td>
342 </tr>
343
344 <tr>
345 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
346 <td valign="top">print program options</td>
347 </tr>
348
349 <tr>
350 <td valign="top"><a href="../www/command-line-options.html#highlight-color">-highlight-color <em class="option">color</em></a></td>
351 <td valign="top">emphasize pixel differences with this color</td>
352 </tr>
353
354 <tr>
355 <td valign="top"><a href="../www/command-line-options.html#identify">-identify</a></td>
356 <td valign="top">identify the format and characteristics of the image</td>
357 </tr>
358
359 <tr>
360 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
361 <td valign="top">type of image interlacing scheme</td>
362 </tr>
363
364 <tr>
365 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
366 <td valign="top">pixel cache resource limit</td>
367 </tr>
368
369 <tr>
370 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
371 <td valign="top">format of debugging information</td>
372 </tr>
373
374 <tr>
375 <td valign="top"><a href="../www/command-line-options.html#lowlight-color">-lowlight-color <em class="option">color</em></a></td>
376 <td valign="top">de-emphasize pixel differences with this color</td>
377 </tr>
378
379 <tr>
380 <td valign="top"><a href="../www/command-line-options.html#metric">-metric <em class="option">type</em></a></td>
381 <td valign="top">measure differences between images with this metric</td>
382 </tr>
383
384 <tr>
385 <td valign="top"><a href="../www/command-line-options.html#profile">-profile <em class="option">filename</em></a></td>
386 <td valign="top">add, delete, or apply an image profile</td>
387 </tr>
388
389 <tr>
390 <td valign="top"><a href="../www/command-line-options.html#quality">-quality <em class="option">value</em></a></td>
391 <td valign="top">JPEG/MIFF/PNG compression level</td>
392 </tr>
393
394 <tr>
395 <td valign="top"><a href="../www/command-line-options.html#quantize">-quantize <em class="option">colorspace</em></a></td>
396 <td valign="top">reduce image colors in this colorspace</td>
397 </tr>
398
399 <tr>
400 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
401 <td valign="top">suppress all warning messages</td>
402 </tr>
403
404 <tr>
405 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
406 <td valign="top">pay attention to warning messages.</td>
407 </tr>
408
409 <tr>
410 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
411 <td valign="top">settings remain in effect until parenthesis boundary.</td>
412 </tr>
413
414 <tr>
415 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
416 <td valign="top">horizontal and vertical sampling factor</td>
417 </tr>
418
419 <tr>
420 <td valign="top"><a href="../www/command-line-options.html#seed">-seed <em class="option">value</em></a></td>
421 <td valign="top">seed a new sequence of pseudo-random numbers</td>
422 </tr>
423
424 <tr>
425 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
426 <td valign="top">set an image attribute</td>
427 </tr>
428
429 <tr>
430 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
431 <td valign="top">width and height of image</td>
432 </tr>
433
434 <tr>
cristy771f7a72010-11-27 21:42:59 +0000[diff] [blame]435 <td valign="top"><a href="../www/command-line-options.html#subimage-search">-subimage-search</a></td>
cristyae6203d2010-08-09 01:12:14 +0000[diff] [blame]436 <td valign="top">search for subimage</td>
437 </tr>
438
439 <tr>
cristy5063d812010-10-19 16:28:10 +0000[diff] [blame]440 <td valign="top"><a href="../www/command-line-options.html#synchronize">-synchronize</a></td>
441 <td valign="top">synchronize image to storage device</td>
442 </tr>
443
444 <tr>
445 <td valign="top"><a href="../www/command-line-options.html#taint">-taint</a></td>
446 <td valign="top">mark the image as modified</td>
447 </tr>
448
449 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]450 <td valign="top"><a href="../www/command-line-options.html#transparent-color">-transparent-color <em class="option">color</em></a></td>
451 <td valign="top">transparent color</td>
452 </tr>
453
454 <tr>
455 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
456 <td valign="top">print detailed information about the image</td>
457 </tr>
458
459 <tr>
460 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
461 <td valign="top">print version information</td>
462 </tr>
463
464 <tr>
465 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
466 <td valign="top">access method for pixels outside the boundaries of the image</td>
467 </tr>
468
469 </tbody>
470</table>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]471
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