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 239
 240 <h1>ImageMagick Compare Command-line Tool</h1>
 241 <p class="navigation-index">[<a href="compare.html#usage">Example Usage</a> &bull; <a href="compare.html#options">Option Summary</a>]</p>
 242
 243 <div class="doc-section">
 244 <p>Use the <kbd>compare</kbd> 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 <kbd>compare</kbd> command or see below for example usages of the command.</p>
 245 </div>
 246
 247 <h2><a id="usage"></a>Example Usage</h2>
 248 <div class="doc-section">
 249
 250 <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>
 251
 252 <p class='crt'><span class="crtprompt"> $ </span><span class='crtin'>convert rose.jpg -sharpen 0x1 reconstruct.jpg</span><span class='crtout'></span><span class="crtprompt"> $ </span><span class='crtin'>compare rose.jpg reconstruct.jpg difference.png</span><span class='crtout'></span><span class="crtprompt"> $ </span><span class='crtin'>compare -compose src rose.jpg reconstruct.jpg difference.png</span></p>
 253 <div class="image">
 254 <p>
 255   <a href="../images/rose.jpg"><img src="../images/rose.jpg" width="70" height="46" alt="rose" /></a>
 256   <a href="../images/reconstruct.jpg"><img src="../images/reconstruct.jpg" width="70" height="46" alt="rose" /></a>
 257   <img style="margin:13px 0;" src="../images/right.gif" width="20" height="20" alt="==>" />
 258   <a href="../images/difference.png"><img src="../images/difference.png" width="70" height="46" alt="rose" /></a>
 259 </p>
 260 </div>
 261
 262 <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>
 263
 264 <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>
 265
 266 <p class='crt'><span class="crtprompt"> $ </span><span class='crtin'>compare -verbose -metric mae rose.jpg reconstruct.jpg difference.png</span><span class='crtout'>Image: rose.jpg     <br/>
 267     Channel distortion: MAE     <br/>
 268       red: 2282.91 (0.034835)     <br/>
 269       green: 1853.99 (0.0282901)     <br/>
 270       blue: 2008.67 (0.0306503)     <br/>
 271       all: 1536.39 (0.0234439)     <br/></span></p><p>Or, if you just want the red channel distortion, use this command:</p>
 272
 273 <p class='crt'><span class="crtprompt"> $ </span><span class='crtin'>compare -channel red -metric PSNR rose.jpg reconstruct.jpg difference.png</span><span class='crtout'>19.63</span></p>
 274 <p>Or, if you just want the overall image distortion, use this command:</p>
 275
 276 <p class='crt'><span class="crtprompt"> $ </span><span class='crtin'>compare -metric PSNR rose.jpg reconstruct.jpg difference.png</span><span class='crtout'>28.31</span></p>
 277 <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>
 278
 279 <p class='crt'><span class="crtprompt"> $ </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>
 280 <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>
 281 </div>
 282
 283 <h2><a id="options"></a>Option Summary</h2>
 284 <div class="doc-section">
 285
 286 <p>The <kbd>compare</kbd> command recognizes these options.  Click on an option to get more details about how that option works.</p>
 287
 288 <table class="doc">
 289   <tbody>
 290   <tr>
 291     <th align="left">Option</th>
 292     <th align="left">Description</th>
 293   </tr>
 294
 295   <tr>
 296     <td valign="top"><a href="command-line-options.html#alpha">-alpha</a></td>
 297     <td valign="top">on, activate, off, deactivate, set, opaque, copy",
 298 transparent, extract, background, or shape the alpha channel</td>
 299   </tr>
 300
 301   <tr>
 302     <td valign="top"><a href="command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
 303     <td valign="top">decrypt image with this password</td>
 304   </tr>
 305
 306   <tr>
 307     <td valign="top"><a href="command-line-options.html#channel">-channel <em class="option">type</em></a></td>
 308     <td valign="top">apply option to select image channels</td>
 309   </tr>
 310
 311   <tr>
 312     <td valign="top"><a href="command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
 313     <td valign="top">set image colorspace</td>
 314   </tr>
 315
 316   <tr>
 317     <td valign="top"><a href="command-line-options.html#compose">-compose <em class="option">operator</em></a></td>
 318     <td valign="top">set image composite operator</td>
 319   </tr>
 320
 321   <tr>
 322     <td valign="top"><a href="command-line-options.html#decipher">-decipher <em class="option">filename</em></a></td>
 323     <td valign="top">convert cipher pixels to plain</td>
 324   </tr>
 325
 326   <tr>
 327     <td valign="top"><a href="command-line-options.html#debug">-debug <em class="option">events</em></a></td>
 328     <td valign="top">display copious debugging information</td>
 329   </tr>
 330
 331   <tr>
 332     <td valign="top"><a href="command-line-options.html#define">-define <em class="option">format:option</em></a></td>
 333     <td valign="top">define one or more image format options</td>
 334   </tr>
 335
 336   <tr>
 337     <td valign="top"><a href="command-line-options.html#density">-density <em class="option">geometry</em></a></td>
 338     <td valign="top">horizontal and vertical density of the image</td>
 339   </tr>
 340
 341   <tr>
 342     <td valign="top"><a href="command-line-options.html#depth">-depth <em class="option">value</em></a></td>
 343     <td valign="top">image depth</td>
 344   </tr>
 345
 346   <tr>
 347     <td valign="top"><a href="command-line-options.html#disimilarity-threshold">-disimilarity-threshold <em class="option">value</em></a></td>
 348     <td valign="top">maximum distortion for (sub)image match (default 0.2)</td>
 349   </tr>
 350
 351   <tr>
 352     <td valign="top"><a href="command-line-options.html#encipher">-encipher <em class="option">filename</em></a></td>
 353     <td valign="top">convert plain pixels to cipher pixels</td>
 354   </tr>
 355
 356   <tr>
 357     <td valign="top"><a href="command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
 358     <td valign="top">extract area from image</td>
 359   </tr>
 360
 361   <tr>
 362     <td valign="top"><a href="command-line-options.html#fuzz">-fuzz <em class="option">distance</em></a></td>
 363     <td valign="top">colors within this distance are considered equal</td>
 364   </tr>
 365
 366   <tr>
 367     <td valign="top"><a href="command-line-options.html#help">-help</a></td>
 368     <td valign="top">print program options</td>
 369   </tr>
 370
 371   <tr>
 372     <td valign="top"><a href="command-line-options.html#highlight-color">-highlight-color <em class="option">color</em></a></td>
 373     <td valign="top">emphasize pixel differences with this color</td>
 374   </tr>
 375
 376   <tr>
 377     <td valign="top"><a href="command-line-options.html#identify">-identify</a></td>
 378     <td valign="top">identify the format and characteristics of the image</td>
 379   </tr>
 380
 381   <tr>
 382     <td valign="top"><a href="command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
 383     <td valign="top">type of image interlacing scheme</td>
 384   </tr>
 385
 386   <tr>
 387     <td valign="top"><a href="command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
 388     <td valign="top">pixel cache resource limit</td>
 389   </tr>
 390
 391   <tr>
 392     <td valign="top"><a href="command-line-options.html#log">-log <em class="option">format</em></a></td>
 393     <td valign="top">format of debugging information</td>
 394   </tr>
 395
 396   <tr>
 397     <td valign="top"><a href="command-line-options.html#lowlight-color">-lowlight-color <em class="option">color</em></a></td>
 398     <td valign="top">de-emphasize pixel differences with this color</td>
 399   </tr>
 400
 401   <tr>
 402     <td valign="top"><a href="command-line-options.html#metric">-metric <em class="option">type</em></a></td>
 403     <td valign="top">measure differences between images with this metric</td>
 404   </tr>
 405
 406   <tr>
 407     <td valign="top"><a href="command-line-options.html#profile">-profile <em class="option">filename</em></a></td>
 408     <td valign="top">add, delete, or apply an image profile</td>
 409   </tr>
 410
 411   <tr>
 412     <td valign="top"><a href="command-line-options.html#quality">-quality <em class="option">value</em></a></td>
 413     <td valign="top">JPEG/MIFF/PNG compression level</td>
 414   </tr>
 415
 416   <tr>
 417     <td valign="top"><a href="command-line-options.html#quantize">-quantize <em class="option">colorspace</em></a></td>
 418     <td valign="top">reduce image colors in this colorspace</td>
 419   </tr>
 420
 421   <tr>
 422     <td valign="top"><a href="command-line-options.html#quiet">-quiet</a></td>
 423     <td valign="top">suppress all warning messages</td>
 424   </tr>
 425
 426   <tr>
 427     <td valign="top"><a href="command-line-options.html#regard-warnings">-regard-warnings</a></td>
 428     <td valign="top">pay attention to warning messages.</td>
 429   </tr>
 430
 431   <tr>
 432     <td valign="top"><a href="command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
 433     <td valign="top">settings remain in effect until parenthesis boundary.</td>
 434   </tr>
 435
 436   <tr>
 437     <td valign="top"><a href="command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
 438     <td valign="top">horizontal and vertical sampling factor</td>
 439   </tr>
 440
 441   <tr>
 442     <td valign="top"><a href="command-line-options.html#seed">-seed <em class="option">value</em></a></td>
 443     <td valign="top">seed a new sequence of pseudo-random numbers</td>
 444   </tr>
 445
 446   <tr>
 447     <td valign="top"><a href="command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
 448     <td valign="top">set an image attribute</td>
 449   </tr>
 450
 451   <tr>
 452     <td valign="top"><a href="command-line-options.html#size">-size <em class="option">geometry</em></a></td>
 453     <td valign="top">width and height of image</td>
 454   </tr>
 455
 456   <tr>
 457     <td valign="top"><a href="command-line-options.html#subimage-search">-subimage-search</a></td>
 458     <td valign="top">search for subimage</td>
 459   </tr>
 460
 461   <tr>
 462     <td valign="top"><a href="command-line-options.html#synchronize">-synchronize</a></td>
 463     <td valign="top">synchronize image to storage device</td>
 464   </tr>
 465
 466   <tr>
 467     <td valign="top"><a href="command-line-options.html#taint">-taint</a></td>
 468     <td valign="top">mark the image as modified</td>
 469   </tr>
 470
 471   <tr>
 472     <td valign="top"><a href="command-line-options.html#transparent-color">-transparent-color <em class="option">color</em></a></td>
 473     <td valign="top">transparent color</td>
 474   </tr>
 475
 476   <tr>
 477     <td valign="top"><a href="command-line-options.html#verbose">-verbose</a></td>
 478     <td valign="top">print detailed information about the image</td>
 479   </tr>
 480
 481   <tr>
 482     <td valign="top"><a href="command-line-options.html#version">-version</a></td>
 483     <td valign="top">print version information</td>
 484   </tr>
 485
 486   <tr>
 487     <td valign="top"><a href="command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
 488     <td valign="top">access method for pixels outside the boundaries of the image</td>
 489   </tr>
 490
 491   </tbody>
 492 </table>
 493 </div>
 494
 495 </div>
 496
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