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189
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]190<h1>ImageMagick Compare Command-line Tool</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]191<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
192
193<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>
194
195<div style="margin: auto;">
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]196 <h2><a id="usage"></a>Example Usage</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]197</div>
198
199<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>
200
201<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>
202<div class="image">
203<p>
204 <a href="../images/rose.jpg"><img src="../images/rose.jpg" width="70" height="46" alt="rose" /></a>
205 <a href="../images/reconstruct.jpg"><img src="../images/reconstruct.jpg" width="70" height="46" alt="rose" /></a>
206 <img style="margin:13px 0;" src="../images/right.gif" width="20" height="20" alt="==>" />
207 <a href="../images/difference.png"><img src="../images/difference.png" width="70" height="46" alt="rose" /></a>
208</p>
209</div>
210
211<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>
212
213<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>
214
215<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/>
216 Channel distortion: MAE <br/>
217 red: 2282.91 (0.034835) <br/>
218 green: 1853.99 (0.0282901) <br/>
219 blue: 2008.67 (0.0306503) <br/>
220 all: 1536.39 (0.0234439) <br/></span></p><p>Or, if you just want the red channel distortion, use this command:</p>
221
222<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>
223<p>Or, if you just want the overall image distortion, use this command:</p>
224
225<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>
226<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>
227
cristyc8ad01f2010-08-20 22:41:04 +0000[diff] [blame]228<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]229<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>
230
231<div style="margin: auto;">
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]232 <h2><a id="options"></a>Option Summary</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]233</div>
234
235<p>The <kbd>compare</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
236
237<table class="doc">
238 <tbody>
239 <tr>
240 <th align="left">Option</th>
241 <th align="left">Description</th>
242 </tr>
243
244 <tr>
245 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
246 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
247transparent, extract, background, or shape the alpha channel</td>
248 </tr>
249
250 <tr>
251 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
252 <td valign="top">decrypt image with this password</td>
253 </tr>
254
255 <tr>
256 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
257 <td valign="top">apply option to select image channels</td>
258 </tr>
259
260 <tr>
261 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
262 <td valign="top">set image colorspace</td>
263 </tr>
264
265 <tr>
266 <td valign="top"><a href="../www/command-line-options.html#compose">-compose <em class="option">operator</em></a></td>
267 <td valign="top">set image composite operator</td>
268 </tr>
269
270 <tr>
271 <td valign="top"><a href="../www/command-line-options.html#decipher">-decipher <em class="option">filename</em></a></td>
272 <td valign="top">convert cipher pixels to plain</td>
273 </tr>
274
275 <tr>
276 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
277 <td valign="top">display copious debugging information</td>
278 </tr>
279
280 <tr>
281 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
282 <td valign="top">define one or more image format options</td>
283 </tr>
284
285 <tr>
286 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
287 <td valign="top">horizontal and vertical density of the image</td>
288 </tr>
289
290 <tr>
291 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
292 <td valign="top">image depth</td>
293 </tr>
294
295 <tr>
296 <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]297 <td valign="top">maximum distortion for (sub)image match (default 0.2)</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]298 </tr>
299
300 <tr>
301 <td valign="top"><a href="../www/command-line-options.html#encipher">-encipher <em class="option">filename</em></a></td>
302 <td valign="top">convert plain pixels to cipher pixels</td>
303 </tr>
304
305 <tr>
306 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
307 <td valign="top">extract area from image</td>
308 </tr>
309
310 <tr>
311 <td valign="top"><a href="../www/command-line-options.html#fuzz">-fuzz <em class="option">distance</em></a></td>
312 <td valign="top">colors within this distance are considered equal</td>
313 </tr>
314
315 <tr>
316 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
317 <td valign="top">print program options</td>
318 </tr>
319
320 <tr>
321 <td valign="top"><a href="../www/command-line-options.html#highlight-color">-highlight-color <em class="option">color</em></a></td>
322 <td valign="top">emphasize pixel differences with this color</td>
323 </tr>
324
325 <tr>
326 <td valign="top"><a href="../www/command-line-options.html#identify">-identify</a></td>
327 <td valign="top">identify the format and characteristics of the image</td>
328 </tr>
329
330 <tr>
331 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
332 <td valign="top">type of image interlacing scheme</td>
333 </tr>
334
335 <tr>
336 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
337 <td valign="top">pixel cache resource limit</td>
338 </tr>
339
340 <tr>
341 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
342 <td valign="top">format of debugging information</td>
343 </tr>
344
345 <tr>
346 <td valign="top"><a href="../www/command-line-options.html#lowlight-color">-lowlight-color <em class="option">color</em></a></td>
347 <td valign="top">de-emphasize pixel differences with this color</td>
348 </tr>
349
350 <tr>
351 <td valign="top"><a href="../www/command-line-options.html#metric">-metric <em class="option">type</em></a></td>
352 <td valign="top">measure differences between images with this metric</td>
353 </tr>
354
355 <tr>
356 <td valign="top"><a href="../www/command-line-options.html#profile">-profile <em class="option">filename</em></a></td>
357 <td valign="top">add, delete, or apply an image profile</td>
358 </tr>
359
360 <tr>
361 <td valign="top"><a href="../www/command-line-options.html#quality">-quality <em class="option">value</em></a></td>
362 <td valign="top">JPEG/MIFF/PNG compression level</td>
363 </tr>
364
365 <tr>
366 <td valign="top"><a href="../www/command-line-options.html#quantize">-quantize <em class="option">colorspace</em></a></td>
367 <td valign="top">reduce image colors in this colorspace</td>
368 </tr>
369
370 <tr>
371 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
372 <td valign="top">suppress all warning messages</td>
373 </tr>
374
375 <tr>
376 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
377 <td valign="top">pay attention to warning messages.</td>
378 </tr>
379
380 <tr>
381 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
382 <td valign="top">settings remain in effect until parenthesis boundary.</td>
383 </tr>
384
385 <tr>
386 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
387 <td valign="top">horizontal and vertical sampling factor</td>
388 </tr>
389
390 <tr>
391 <td valign="top"><a href="../www/command-line-options.html#seed">-seed <em class="option">value</em></a></td>
392 <td valign="top">seed a new sequence of pseudo-random numbers</td>
393 </tr>
394
395 <tr>
396 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
397 <td valign="top">set an image attribute</td>
398 </tr>
399
400 <tr>
401 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
402 <td valign="top">width and height of image</td>
403 </tr>
404
405 <tr>
cristy771f7a72010-11-27 21:42:59 +0000[diff] [blame]406 <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]407 <td valign="top">search for subimage</td>
408 </tr>
409
410 <tr>
cristy5063d812010-10-19 16:28:10 +0000[diff] [blame]411 <td valign="top"><a href="../www/command-line-options.html#synchronize">-synchronize</a></td>
412 <td valign="top">synchronize image to storage device</td>
413 </tr>
414
415 <tr>
416 <td valign="top"><a href="../www/command-line-options.html#taint">-taint</a></td>
417 <td valign="top">mark the image as modified</td>
418 </tr>
419
420 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]421 <td valign="top"><a href="../www/command-line-options.html#transparent-color">-transparent-color <em class="option">color</em></a></td>
422 <td valign="top">transparent color</td>
423 </tr>
424
425 <tr>
426 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
427 <td valign="top">print detailed information about the image</td>
428 </tr>
429
430 <tr>
431 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
432 <td valign="top">print version information</td>
433 </tr>
434
435 <tr>
436 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
437 <td valign="top">access method for pixels outside the boundaries of the image</td>
438 </tr>
439
440 </tbody>
441</table>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]442
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