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170
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]171<h1>ImageMagick Compare Command-line Utility</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]172<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
173
174<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>
175
176<div style="margin: auto;">
177 <h2><a name="usage"></a>Example Usage</h2>
178</div>
179
180<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>
181
182<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>
183<div class="image">
184<p>
185 <a href="../images/rose.jpg"><img src="../images/rose.jpg" width="70" height="46" alt="rose" /></a>
186 <a href="../images/reconstruct.jpg"><img src="../images/reconstruct.jpg" width="70" height="46" alt="rose" /></a>
187 <img style="margin:13px 0;" src="../images/right.gif" width="20" height="20" alt="==>" />
188 <a href="../images/difference.png"><img src="../images/difference.png" width="70" height="46" alt="rose" /></a>
189</p>
190</div>
191
192<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>
193
194<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>
195
196<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/>
197 Channel distortion: MAE <br/>
198 red: 2282.91 (0.034835) <br/>
199 green: 1853.99 (0.0282901) <br/>
200 blue: 2008.67 (0.0306503) <br/>
201 all: 1536.39 (0.0234439) <br/></span></p><p>Or, if you just want the red channel distortion, use this command:</p>
202
203<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>
204<p>Or, if you just want the overall image distortion, use this command:</p>
205
206<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>
207<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>
208
cristyc8ad01f2010-08-20 22:41:04 +0000[diff] [blame]209<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]210<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>
211
212<div style="margin: auto;">
213 <h2><a name="options"></a>Option Summary</h2>
214</div>
215
216<p>The <kbd>compare</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
217
218<table class="doc">
219 <tbody>
220 <tr>
221 <th align="left">Option</th>
222 <th align="left">Description</th>
223 </tr>
224
225 <tr>
226 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
227 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
228transparent, extract, background, or shape the alpha channel</td>
229 </tr>
230
231 <tr>
232 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
233 <td valign="top">decrypt image with this password</td>
234 </tr>
235
236 <tr>
237 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
238 <td valign="top">apply option to select image channels</td>
239 </tr>
240
241 <tr>
242 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
243 <td valign="top">set image colorspace</td>
244 </tr>
245
246 <tr>
247 <td valign="top"><a href="../www/command-line-options.html#compose">-compose <em class="option">operator</em></a></td>
248 <td valign="top">set image composite operator</td>
249 </tr>
250
251 <tr>
252 <td valign="top"><a href="../www/command-line-options.html#decipher">-decipher <em class="option">filename</em></a></td>
253 <td valign="top">convert cipher pixels to plain</td>
254 </tr>
255
256 <tr>
257 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
258 <td valign="top">display copious debugging information</td>
259 </tr>
260
261 <tr>
262 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
263 <td valign="top">define one or more image format options</td>
264 </tr>
265
266 <tr>
267 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
268 <td valign="top">horizontal and vertical density of the image</td>
269 </tr>
270
271 <tr>
272 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
273 <td valign="top">image depth</td>
274 </tr>
275
276 <tr>
277 <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]278 <td valign="top">maximum distortion for (sub)image match (default 0.2)</td>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]279 </tr>
280
281 <tr>
282 <td valign="top"><a href="../www/command-line-options.html#encipher">-encipher <em class="option">filename</em></a></td>
283 <td valign="top">convert plain pixels to cipher pixels</td>
284 </tr>
285
286 <tr>
287 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
288 <td valign="top">extract area from image</td>
289 </tr>
290
291 <tr>
292 <td valign="top"><a href="../www/command-line-options.html#fuzz">-fuzz <em class="option">distance</em></a></td>
293 <td valign="top">colors within this distance are considered equal</td>
294 </tr>
295
296 <tr>
297 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
298 <td valign="top">print program options</td>
299 </tr>
300
301 <tr>
302 <td valign="top"><a href="../www/command-line-options.html#highlight-color">-highlight-color <em class="option">color</em></a></td>
303 <td valign="top">emphasize pixel differences with this color</td>
304 </tr>
305
306 <tr>
307 <td valign="top"><a href="../www/command-line-options.html#identify">-identify</a></td>
308 <td valign="top">identify the format and characteristics of the image</td>
309 </tr>
310
311 <tr>
312 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
313 <td valign="top">type of image interlacing scheme</td>
314 </tr>
315
316 <tr>
317 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
318 <td valign="top">pixel cache resource limit</td>
319 </tr>
320
321 <tr>
322 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
323 <td valign="top">format of debugging information</td>
324 </tr>
325
326 <tr>
327 <td valign="top"><a href="../www/command-line-options.html#lowlight-color">-lowlight-color <em class="option">color</em></a></td>
328 <td valign="top">de-emphasize pixel differences with this color</td>
329 </tr>
330
331 <tr>
332 <td valign="top"><a href="../www/command-line-options.html#metric">-metric <em class="option">type</em></a></td>
333 <td valign="top">measure differences between images with this metric</td>
334 </tr>
335
336 <tr>
337 <td valign="top"><a href="../www/command-line-options.html#profile">-profile <em class="option">filename</em></a></td>
338 <td valign="top">add, delete, or apply an image profile</td>
339 </tr>
340
341 <tr>
342 <td valign="top"><a href="../www/command-line-options.html#quality">-quality <em class="option">value</em></a></td>
343 <td valign="top">JPEG/MIFF/PNG compression level</td>
344 </tr>
345
346 <tr>
347 <td valign="top"><a href="../www/command-line-options.html#quantize">-quantize <em class="option">colorspace</em></a></td>
348 <td valign="top">reduce image colors in this colorspace</td>
349 </tr>
350
351 <tr>
352 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
353 <td valign="top">suppress all warning messages</td>
354 </tr>
355
356 <tr>
357 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
358 <td valign="top">pay attention to warning messages.</td>
359 </tr>
360
361 <tr>
362 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
363 <td valign="top">settings remain in effect until parenthesis boundary.</td>
364 </tr>
365
366 <tr>
367 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
368 <td valign="top">horizontal and vertical sampling factor</td>
369 </tr>
370
371 <tr>
372 <td valign="top"><a href="../www/command-line-options.html#seed">-seed <em class="option">value</em></a></td>
373 <td valign="top">seed a new sequence of pseudo-random numbers</td>
374 </tr>
375
376 <tr>
377 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
378 <td valign="top">set an image attribute</td>
379 </tr>
380
381 <tr>
382 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
383 <td valign="top">width and height of image</td>
384 </tr>
385
386 <tr>
cristy771f7a72010-11-27 21:42:59 +0000[diff] [blame]387 <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]388 <td valign="top">search for subimage</td>
389 </tr>
390
391 <tr>
cristy5063d812010-10-19 16:28:10 +0000[diff] [blame]392 <td valign="top"><a href="../www/command-line-options.html#synchronize">-synchronize</a></td>
393 <td valign="top">synchronize image to storage device</td>
394 </tr>
395
396 <tr>
397 <td valign="top"><a href="../www/command-line-options.html#taint">-taint</a></td>
398 <td valign="top">mark the image as modified</td>
399 </tr>
400
401 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]402 <td valign="top"><a href="../www/command-line-options.html#transparent-color">-transparent-color <em class="option">color</em></a></td>
403 <td valign="top">transparent color</td>
404 </tr>
405
406 <tr>
407 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
408 <td valign="top">print detailed information about the image</td>
409 </tr>
410
411 <tr>
412 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
413 <td valign="top">print version information</td>
414 </tr>
415
416 <tr>
417 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
418 <td valign="top">access method for pixels outside the boundaries of the image</td>
419 </tr>
420
421 </tbody>
422</table>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]423
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