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181
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]182<h1>ImageMagick Compare Command-line Tool</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]183<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
184
185<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>
186
187<div style="margin: auto;">
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]188 <h2><a id="usage"></a>Example Usage</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]189</div>
190
191<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>
192
193<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>
194<div class="image">
195<p>
196 <a href="../images/rose.jpg"><img src="../images/rose.jpg" width="70" height="46" alt="rose" /></a>
197 <a href="../images/reconstruct.jpg"><img src="../images/reconstruct.jpg" width="70" height="46" alt="rose" /></a>
198 <img style="margin:13px 0;" src="../images/right.gif" width="20" height="20" alt="==>" />
199 <a href="../images/difference.png"><img src="../images/difference.png" width="70" height="46" alt="rose" /></a>
200</p>
201</div>
202
203<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>
204
205<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>
206
207<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/>
208 Channel distortion: MAE <br/>
209 red: 2282.91 (0.034835) <br/>
210 green: 1853.99 (0.0282901) <br/>
211 blue: 2008.67 (0.0306503) <br/>
212 all: 1536.39 (0.0234439) <br/></span></p><p>Or, if you just want the red channel distortion, use this command:</p>
213
214<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>
215<p>Or, if you just want the overall image distortion, use this command:</p>
216
217<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>
218<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>
219
cristyc8ad01f2010-08-20 22:41:04 +0000[diff] [blame]220<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]221<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>
222
223<div style="margin: auto;">
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]224 <h2><a id="options"></a>Option Summary</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]225</div>
226
227<p>The <kbd>compare</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
228
229<table class="doc">
230 <tbody>
231 <tr>
232 <th align="left">Option</th>
233 <th align="left">Description</th>
234 </tr>
235
236 <tr>
237 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
238 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
239transparent, extract, background, or shape the alpha channel</td>
240 </tr>
241
242 <tr>
243 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
244 <td valign="top">decrypt image with this password</td>
245 </tr>
246
247 <tr>
248 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
249 <td valign="top">apply option to select image channels</td>
250 </tr>
251
252 <tr>
253 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
254 <td valign="top">set image colorspace</td>
255 </tr>
256
257 <tr>
258 <td valign="top"><a href="../www/command-line-options.html#compose">-compose <em class="option">operator</em></a></td>
259 <td valign="top">set image composite operator</td>
260 </tr>
261
262 <tr>
263 <td valign="top"><a href="../www/command-line-options.html#decipher">-decipher <em class="option">filename</em></a></td>
264 <td valign="top">convert cipher pixels to plain</td>
265 </tr>
266
267 <tr>
268 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
269 <td valign="top">display copious debugging information</td>
270 </tr>
271
272 <tr>
273 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
274 <td valign="top">define one or more image format options</td>
275 </tr>
276
277 <tr>
278 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
279 <td valign="top">horizontal and vertical density of the image</td>
280 </tr>
281
282 <tr>
283 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
284 <td valign="top">image depth</td>
285 </tr>
286
287 <tr>
288 <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]289 <td valign="top">maximum distortion for (sub)image match (default 0.2)</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]290 </tr>
291
292 <tr>
293 <td valign="top"><a href="../www/command-line-options.html#encipher">-encipher <em class="option">filename</em></a></td>
294 <td valign="top">convert plain pixels to cipher pixels</td>
295 </tr>
296
297 <tr>
298 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
299 <td valign="top">extract area from image</td>
300 </tr>
301
302 <tr>
303 <td valign="top"><a href="../www/command-line-options.html#fuzz">-fuzz <em class="option">distance</em></a></td>
304 <td valign="top">colors within this distance are considered equal</td>
305 </tr>
306
307 <tr>
308 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
309 <td valign="top">print program options</td>
310 </tr>
311
312 <tr>
313 <td valign="top"><a href="../www/command-line-options.html#highlight-color">-highlight-color <em class="option">color</em></a></td>
314 <td valign="top">emphasize pixel differences with this color</td>
315 </tr>
316
317 <tr>
318 <td valign="top"><a href="../www/command-line-options.html#identify">-identify</a></td>
319 <td valign="top">identify the format and characteristics of the image</td>
320 </tr>
321
322 <tr>
323 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
324 <td valign="top">type of image interlacing scheme</td>
325 </tr>
326
327 <tr>
328 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
329 <td valign="top">pixel cache resource limit</td>
330 </tr>
331
332 <tr>
333 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
334 <td valign="top">format of debugging information</td>
335 </tr>
336
337 <tr>
338 <td valign="top"><a href="../www/command-line-options.html#lowlight-color">-lowlight-color <em class="option">color</em></a></td>
339 <td valign="top">de-emphasize pixel differences with this color</td>
340 </tr>
341
342 <tr>
343 <td valign="top"><a href="../www/command-line-options.html#metric">-metric <em class="option">type</em></a></td>
344 <td valign="top">measure differences between images with this metric</td>
345 </tr>
346
347 <tr>
348 <td valign="top"><a href="../www/command-line-options.html#profile">-profile <em class="option">filename</em></a></td>
349 <td valign="top">add, delete, or apply an image profile</td>
350 </tr>
351
352 <tr>
353 <td valign="top"><a href="../www/command-line-options.html#quality">-quality <em class="option">value</em></a></td>
354 <td valign="top">JPEG/MIFF/PNG compression level</td>
355 </tr>
356
357 <tr>
358 <td valign="top"><a href="../www/command-line-options.html#quantize">-quantize <em class="option">colorspace</em></a></td>
359 <td valign="top">reduce image colors in this colorspace</td>
360 </tr>
361
362 <tr>
363 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
364 <td valign="top">suppress all warning messages</td>
365 </tr>
366
367 <tr>
368 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
369 <td valign="top">pay attention to warning messages.</td>
370 </tr>
371
372 <tr>
373 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
374 <td valign="top">settings remain in effect until parenthesis boundary.</td>
375 </tr>
376
377 <tr>
378 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
379 <td valign="top">horizontal and vertical sampling factor</td>
380 </tr>
381
382 <tr>
383 <td valign="top"><a href="../www/command-line-options.html#seed">-seed <em class="option">value</em></a></td>
384 <td valign="top">seed a new sequence of pseudo-random numbers</td>
385 </tr>
386
387 <tr>
388 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
389 <td valign="top">set an image attribute</td>
390 </tr>
391
392 <tr>
393 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
394 <td valign="top">width and height of image</td>
395 </tr>
396
397 <tr>
cristy771f7a72010-11-27 21:42:59 +0000[diff] [blame]398 <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]399 <td valign="top">search for subimage</td>
400 </tr>
401
402 <tr>
cristy5063d812010-10-19 16:28:10 +0000[diff] [blame]403 <td valign="top"><a href="../www/command-line-options.html#synchronize">-synchronize</a></td>
404 <td valign="top">synchronize image to storage device</td>
405 </tr>
406
407 <tr>
408 <td valign="top"><a href="../www/command-line-options.html#taint">-taint</a></td>
409 <td valign="top">mark the image as modified</td>
410 </tr>
411
412 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]413 <td valign="top"><a href="../www/command-line-options.html#transparent-color">-transparent-color <em class="option">color</em></a></td>
414 <td valign="top">transparent color</td>
415 </tr>
416
417 <tr>
418 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
419 <td valign="top">print detailed information about the image</td>
420 </tr>
421
422 <tr>
423 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
424 <td valign="top">print version information</td>
425 </tr>
426
427 <tr>
428 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
429 <td valign="top">access method for pixels outside the boundaries of the image</td>
430 </tr>
431
432 </tbody>
433</table>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]434
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