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cristy | dcca3fa | 2010-12-29 21:50:07 +0000 | [diff] [blame] | 190 | <h1>ImageMagick Compare Command-line Tool</h1> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 191 | <p class="navigation-index">[<a href="#usage">Example Usage</a> • <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;"> |
cristy | dcca3fa | 2010-12-29 21:50:07 +0000 | [diff] [blame] | 196 | <h2><a id="usage"></a>Example Usage</h2> |
cristy | 3ed852e | 2009-09-05 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> </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> |
| 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> </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> </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> </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 | |
cristy | c8ad01f | 2010-08-20 22:41:04 +0000 | [diff] [blame] | 228 | <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] | 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;"> |
cristy | dcca3fa | 2010-12-29 21:50:07 +0000 | [diff] [blame] | 232 | <h2><a id="options"></a>Option Summary</h2> |
cristy | 3ed852e | 2009-09-05 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", |
| 247 | transparent, 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> |
cristy | 771f7a7 | 2010-11-27 21:42:59 +0000 | [diff] [blame] | 297 | <td valign="top">maximum distortion for (sub)image match (default 0.2)</td> |
cristy | 3ed852e | 2009-09-05 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> |
cristy | 771f7a7 | 2010-11-27 21:42:59 +0000 | [diff] [blame] | 406 | <td valign="top"><a href="../www/command-line-options.html#subimage-search">-subimage-search</a></td> |
cristy | ae6203d | 2010-08-09 01:12:14 +0000 | [diff] [blame] | 407 | <td valign="top">search for subimage</td> |
| 408 | </tr> |
| 409 | |
| 410 | <tr> |
cristy | 5063d81 | 2010-10-19 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> |
cristy | 3ed852e | 2009-09-05 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> |
cristy | 3eaa0ef | 2010-03-06 20:35:26 +0000 | [diff] [blame] | 442 |
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cristy | a890294 | 2010-07-30 00:49:52 +0000 | [diff] [blame] | 449 | <a href="http://www.imagemagick.org/MagickStudio/scripts/MagickStudio.cgi">Studio</a>
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cristy | 3eaa0ef | 2010-03-06 20:35:26 +0000 | [diff] [blame] | 450 | </span>
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