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cristy | dcca3fa | 2010-12-29 21:50:07 +0000 | [diff] [blame] | 212 | <h1>ImageMagick Compare Command-line Tool</h1> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 213 | <p class="navigation-index">[<a href="#usage">Example Usage</a> • <a href="#options">Option Summary</a>]</p> |
| 214 | |
| 215 | <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> |
| 216 | |
| 217 | <div style="margin: auto;"> |
cristy | dcca3fa | 2010-12-29 21:50:07 +0000 | [diff] [blame] | 218 | <h2><a id="usage"></a>Example Usage</h2> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 219 | </div> |
| 220 | |
| 221 | <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> |
| 222 | |
| 223 | <p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>convert rose.jpg -sharpen 0x1 reconstruct.jpg</span><span class='crtout'></span><span class="crtprompt"> $magick> </span><span class='crtin'>compare rose.jpg reconstruct.jpg difference.png</span><span class='crtout'></span><span class="crtprompt"> $magick> </span><span class='crtin'>compare -compose src rose.jpg reconstruct.jpg difference.png</span></p> |
| 224 | <div class="image"> |
| 225 | <p> |
| 226 | <a href="../images/rose.jpg"><img src="../images/rose.jpg" width="70" height="46" alt="rose" /></a> |
| 227 | <a href="../images/reconstruct.jpg"><img src="../images/reconstruct.jpg" width="70" height="46" alt="rose" /></a> |
| 228 | <img style="margin:13px 0;" src="../images/right.gif" width="20" height="20" alt="==>" /> |
| 229 | <a href="../images/difference.png"><img src="../images/difference.png" width="70" height="46" alt="rose" /></a> |
| 230 | </p> |
| 231 | </div> |
| 232 | |
| 233 | <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> |
| 234 | |
| 235 | <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> |
| 236 | |
| 237 | <p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>compare -verbose -metric mae rose.jpg reconstruct.jpg difference.png</span><span class='crtout'>Image: rose.jpg <br/> |
| 238 | Channel distortion: MAE <br/> |
| 239 | red: 2282.91 (0.034835) <br/> |
| 240 | green: 1853.99 (0.0282901) <br/> |
| 241 | blue: 2008.67 (0.0306503) <br/> |
| 242 | all: 1536.39 (0.0234439) <br/></span></p><p>Or, if you just want the red channel distortion, use this command:</p> |
| 243 | |
| 244 | <p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>compare -channel red -metric PSNR rose.jpg reconstruct.jpg difference.png</span><span class='crtout'>19.63</span></p> |
| 245 | <p>Or, if you just want the overall image distortion, use this command:</p> |
| 246 | |
| 247 | <p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>compare -metric PSNR rose.jpg reconstruct.jpg difference.png</span><span class='crtout'>28.31</span></p> |
| 248 | <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> |
| 249 | |
cristy | c8ad01f | 2010-08-20 22:41:04 +0000 | [diff] [blame] | 250 | <p class='crt'><span class="crtprompt"> $magick> </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> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 251 | <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> |
| 252 | |
| 253 | <div style="margin: auto;"> |
cristy | dcca3fa | 2010-12-29 21:50:07 +0000 | [diff] [blame] | 254 | <h2><a id="options"></a>Option Summary</h2> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 255 | </div> |
| 256 | |
| 257 | <p>The <kbd>compare</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p> |
| 258 | |
| 259 | <table class="doc"> |
| 260 | <tbody> |
| 261 | <tr> |
| 262 | <th align="left">Option</th> |
| 263 | <th align="left">Description</th> |
| 264 | </tr> |
| 265 | |
| 266 | <tr> |
| 267 | <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td> |
| 268 | <td valign="top">on, activate, off, deactivate, set, opaque, copy", |
| 269 | transparent, extract, background, or shape the alpha channel</td> |
| 270 | </tr> |
| 271 | |
| 272 | <tr> |
| 273 | <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td> |
| 274 | <td valign="top">decrypt image with this password</td> |
| 275 | </tr> |
| 276 | |
| 277 | <tr> |
| 278 | <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td> |
| 279 | <td valign="top">apply option to select image channels</td> |
| 280 | </tr> |
| 281 | |
| 282 | <tr> |
| 283 | <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td> |
| 284 | <td valign="top">set image colorspace</td> |
| 285 | </tr> |
| 286 | |
| 287 | <tr> |
| 288 | <td valign="top"><a href="../www/command-line-options.html#compose">-compose <em class="option">operator</em></a></td> |
| 289 | <td valign="top">set image composite operator</td> |
| 290 | </tr> |
| 291 | |
| 292 | <tr> |
| 293 | <td valign="top"><a href="../www/command-line-options.html#decipher">-decipher <em class="option">filename</em></a></td> |
| 294 | <td valign="top">convert cipher pixels to plain</td> |
| 295 | </tr> |
| 296 | |
| 297 | <tr> |
| 298 | <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td> |
| 299 | <td valign="top">display copious debugging information</td> |
| 300 | </tr> |
| 301 | |
| 302 | <tr> |
| 303 | <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td> |
| 304 | <td valign="top">define one or more image format options</td> |
| 305 | </tr> |
| 306 | |
| 307 | <tr> |
| 308 | <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td> |
| 309 | <td valign="top">horizontal and vertical density of the image</td> |
| 310 | </tr> |
| 311 | |
| 312 | <tr> |
| 313 | <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td> |
| 314 | <td valign="top">image depth</td> |
| 315 | </tr> |
| 316 | |
| 317 | <tr> |
| 318 | <td valign="top"><a href="../www/command-line-options.html#disimilarity-threshold">-disimilarity-threshold <em class="option">value</em></a></td> |
cristy | 771f7a7 | 2010-11-27 21:42:59 +0000 | [diff] [blame] | 319 | <td valign="top">maximum distortion for (sub)image match (default 0.2)</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 320 | </tr> |
| 321 | |
| 322 | <tr> |
| 323 | <td valign="top"><a href="../www/command-line-options.html#encipher">-encipher <em class="option">filename</em></a></td> |
| 324 | <td valign="top">convert plain pixels to cipher pixels</td> |
| 325 | </tr> |
| 326 | |
| 327 | <tr> |
| 328 | <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td> |
| 329 | <td valign="top">extract area from image</td> |
| 330 | </tr> |
| 331 | |
| 332 | <tr> |
| 333 | <td valign="top"><a href="../www/command-line-options.html#fuzz">-fuzz <em class="option">distance</em></a></td> |
| 334 | <td valign="top">colors within this distance are considered equal</td> |
| 335 | </tr> |
| 336 | |
| 337 | <tr> |
| 338 | <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td> |
| 339 | <td valign="top">print program options</td> |
| 340 | </tr> |
| 341 | |
| 342 | <tr> |
| 343 | <td valign="top"><a href="../www/command-line-options.html#highlight-color">-highlight-color <em class="option">color</em></a></td> |
| 344 | <td valign="top">emphasize pixel differences with this color</td> |
| 345 | </tr> |
| 346 | |
| 347 | <tr> |
| 348 | <td valign="top"><a href="../www/command-line-options.html#identify">-identify</a></td> |
| 349 | <td valign="top">identify the format and characteristics of the image</td> |
| 350 | </tr> |
| 351 | |
| 352 | <tr> |
| 353 | <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td> |
| 354 | <td valign="top">type of image interlacing scheme</td> |
| 355 | </tr> |
| 356 | |
| 357 | <tr> |
| 358 | <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td> |
| 359 | <td valign="top">pixel cache resource limit</td> |
| 360 | </tr> |
| 361 | |
| 362 | <tr> |
| 363 | <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td> |
| 364 | <td valign="top">format of debugging information</td> |
| 365 | </tr> |
| 366 | |
| 367 | <tr> |
| 368 | <td valign="top"><a href="../www/command-line-options.html#lowlight-color">-lowlight-color <em class="option">color</em></a></td> |
| 369 | <td valign="top">de-emphasize pixel differences with this color</td> |
| 370 | </tr> |
| 371 | |
| 372 | <tr> |
| 373 | <td valign="top"><a href="../www/command-line-options.html#metric">-metric <em class="option">type</em></a></td> |
| 374 | <td valign="top">measure differences between images with this metric</td> |
| 375 | </tr> |
| 376 | |
| 377 | <tr> |
| 378 | <td valign="top"><a href="../www/command-line-options.html#profile">-profile <em class="option">filename</em></a></td> |
| 379 | <td valign="top">add, delete, or apply an image profile</td> |
| 380 | </tr> |
| 381 | |
| 382 | <tr> |
| 383 | <td valign="top"><a href="../www/command-line-options.html#quality">-quality <em class="option">value</em></a></td> |
| 384 | <td valign="top">JPEG/MIFF/PNG compression level</td> |
| 385 | </tr> |
| 386 | |
| 387 | <tr> |
| 388 | <td valign="top"><a href="../www/command-line-options.html#quantize">-quantize <em class="option">colorspace</em></a></td> |
| 389 | <td valign="top">reduce image colors in this colorspace</td> |
| 390 | </tr> |
| 391 | |
| 392 | <tr> |
| 393 | <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td> |
| 394 | <td valign="top">suppress all warning messages</td> |
| 395 | </tr> |
| 396 | |
| 397 | <tr> |
| 398 | <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td> |
| 399 | <td valign="top">pay attention to warning messages.</td> |
| 400 | </tr> |
| 401 | |
| 402 | <tr> |
| 403 | <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td> |
| 404 | <td valign="top">settings remain in effect until parenthesis boundary.</td> |
| 405 | </tr> |
| 406 | |
| 407 | <tr> |
| 408 | <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td> |
| 409 | <td valign="top">horizontal and vertical sampling factor</td> |
| 410 | </tr> |
| 411 | |
| 412 | <tr> |
| 413 | <td valign="top"><a href="../www/command-line-options.html#seed">-seed <em class="option">value</em></a></td> |
| 414 | <td valign="top">seed a new sequence of pseudo-random numbers</td> |
| 415 | </tr> |
| 416 | |
| 417 | <tr> |
| 418 | <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td> |
| 419 | <td valign="top">set an image attribute</td> |
| 420 | </tr> |
| 421 | |
| 422 | <tr> |
| 423 | <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td> |
| 424 | <td valign="top">width and height of image</td> |
| 425 | </tr> |
| 426 | |
| 427 | <tr> |
cristy | 771f7a7 | 2010-11-27 21:42:59 +0000 | [diff] [blame] | 428 | <td valign="top"><a href="../www/command-line-options.html#subimage-search">-subimage-search</a></td> |
cristy | ae6203d | 2010-08-09 01:12:14 +0000 | [diff] [blame] | 429 | <td valign="top">search for subimage</td> |
| 430 | </tr> |
| 431 | |
| 432 | <tr> |
cristy | 5063d81 | 2010-10-19 16:28:10 +0000 | [diff] [blame] | 433 | <td valign="top"><a href="../www/command-line-options.html#synchronize">-synchronize</a></td> |
| 434 | <td valign="top">synchronize image to storage device</td> |
| 435 | </tr> |
| 436 | |
| 437 | <tr> |
| 438 | <td valign="top"><a href="../www/command-line-options.html#taint">-taint</a></td> |
| 439 | <td valign="top">mark the image as modified</td> |
| 440 | </tr> |
| 441 | |
| 442 | <tr> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 443 | <td valign="top"><a href="../www/command-line-options.html#transparent-color">-transparent-color <em class="option">color</em></a></td> |
| 444 | <td valign="top">transparent color</td> |
| 445 | </tr> |
| 446 | |
| 447 | <tr> |
| 448 | <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td> |
| 449 | <td valign="top">print detailed information about the image</td> |
| 450 | </tr> |
| 451 | |
| 452 | <tr> |
| 453 | <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td> |
| 454 | <td valign="top">print version information</td> |
| 455 | </tr> |
| 456 | |
| 457 | <tr> |
| 458 | <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td> |
| 459 | <td valign="top">access method for pixels outside the boundaries of the image</td> |
| 460 | </tr> |
| 461 | |
| 462 | </tbody> |
| 463 | </table> |
cristy | 3eaa0ef | 2010-03-06 20:35:26 +0000 | [diff] [blame] | 464 |
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