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cristy | 29f2c97 | 2015-07-28 13:37:46 +0000 | [diff] [blame^] | 4 | <title>ImageMagick: Command-line Tools: Compare</title> |
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cristy | a1890f0 | 2015-05-15 23:32:44 +0000 | [diff] [blame] | 41 | <a class="magick-nav-item pull-right" href="http://www.imagemagick.org/discourse-server/">Community</a> |
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| 46 | <div class="magick-header"> |
| 47 | <p class="text-center"><a href="compare.html#usage">Example Usage</a> • <a href="compare.html#options">Option Summary</a></p> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 48 | |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 49 | <p class="lead magick-description">Use the <code>compare</code> 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 <code>compare</code> command or see below for example usages of the command.</p> |
| 50 | |
| 51 | <h2 class="magick-header"><a id="usage"></a>Example Usage</h2> |
cristy | 751980d | 2012-06-03 23:18:35 +0000 | [diff] [blame] | 52 | |
cristy | 8ee7f24 | 2013-06-20 16:08:44 +0000 | [diff] [blame] | 53 | <p>We list a few examples of the <code>compare</code> command here to illustrate its usefulness and ease of use. To get started, lets compare an image to one thats been sharpened:</p> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 54 | |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 55 | <pre> |
| 56 | convert rose.jpg -sharpen 0x1 reconstruct.jpg |
| 57 | compare rose.jpg reconstruct.jpg difference.png |
| 58 | compare -compose src rose.jpg reconstruct.jpg difference.png |
| 59 | </pre> |
| 60 | |
| 61 | <ul> |
| 62 | <a href="../images/rose.jpg"><img src="../images/rose.jpg" width="70" height="46" alt="rose"></a> |
| 63 | <a href="../images/reconstruct.jpg"><img src="../images/reconstruct.jpg" width="70" height="46" alt="rose"></a> |
| 64 | <img style="margin:13px 0;" src="../images/right.gif" width="20" height="20" alt="==>"> |
| 65 | <a href="../images/difference.png"><img src="../images/difference.png" width="70" height="46" alt="rose"></a> |
| 66 | </ul> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 67 | |
| 68 | <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> |
| 69 | |
| 70 | <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> |
| 71 | |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 72 | <pre> |
| 73 | -> compare -verbose -metric mae rose.jpg reconstruct.jpg difference.png |
| 74 | Image: rose.jpg |
| 75 | Channel distortion: MAE |
| 76 | red: 2282.91 (0.034835) |
| 77 | green: 1853.99 (0.0282901) |
| 78 | blue: 2008.67 (0.0306503) |
| 79 | all: 1536.39 (0.0234439) |
| 80 | </pre> |
| 81 | <p>Or, if you just want the red channel distortion, use this command:</p> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 82 | |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 83 | <pre> |
| 84 | -> compare -channel red -metric PSNR rose.jpg reconstruct.jpg difference.png |
| 85 | 19.63 |
| 86 | </pre> |
| 87 | |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 88 | <p>Or, if you just want the overall image distortion, use this command:</p> |
| 89 | |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 90 | <pre> |
| 91 | -> compare -metric PSNR rose.jpg reconstruct.jpg difference.png |
| 92 | 28.31 |
| 93 | </pre> |
| 94 | |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 95 | <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> |
| 96 | |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 97 | <pre> |
| 98 | -> compare -metric RMSE -subimage-search logo.png wizard.jpg similarity.gif |
| 99 | 85.05 (0.00129778) @ 353,157 |
| 100 | </pre> |
| 101 | |
cristy | 9146993 | 2014-07-25 11:00:25 +0000 | [diff] [blame] | 102 | <p>You can find additional examples of using <code>compare</code> in <a href="http://www.ibm.com/developerworks/library/l-graf/?ca=dnt-428">Graphics from the Command Line</a>. Further discussion is available in <a href="http://www.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> |
cristy | f1b8a09 | 2014-02-20 15:46:11 +0000 | [diff] [blame] | 103 | |
| 104 | <p>The compare program returns 2 on error otherwise 0 if the images are similar or 1 if they are dissimilar.</p> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 105 | |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 106 | <h2 class="magick-header"><a id="options"></a>Option Summary</h2> |
cristy | 751980d | 2012-06-03 23:18:35 +0000 | [diff] [blame] | 107 | |
cristy | 8ee7f24 | 2013-06-20 16:08:44 +0000 | [diff] [blame] | 108 | <p>The <code>compare</code> command recognizes these options. Click on an option to get more details about how that option works.</p> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 109 | |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 110 | <table class="table table-condensed table-striped"> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 111 | <tbody> |
| 112 | <tr> |
| 113 | <th align="left">Option</th> |
| 114 | <th align="left">Description</th> |
| 115 | </tr> |
| 116 | |
| 117 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 118 | <td><a href="command-line-options.html#alpha">-alpha</a></td> |
| 119 | <td>on, activate, off, deactivate, set, opaque, copy", |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 120 | transparent, extract, background, or shape the alpha channel</td> |
| 121 | </tr> |
| 122 | |
| 123 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 124 | <td><a href="command-line-options.html#authenticate">-authenticate <var>value</var></a></td> |
| 125 | <td>decrypt image with this password</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 126 | </tr> |
| 127 | |
| 128 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 129 | <td><a href="command-line-options.html#channel">-channel <var>type</var></a></td> |
| 130 | <td>apply option to select image channels</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 131 | </tr> |
| 132 | |
| 133 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 134 | <td><a href="command-line-options.html#colorspace">-colorspace <var>type</var></a></td> |
| 135 | <td>set image colorspace</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 136 | </tr> |
| 137 | |
| 138 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 139 | <td><a href="command-line-options.html#compose">-compose <var>operator</var></a></td> |
| 140 | <td>set image composite operator</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 141 | </tr> |
| 142 | |
| 143 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 144 | <td><a href="command-line-options.html#decipher">-decipher <var>filename</var></a></td> |
| 145 | <td>convert cipher pixels to plain</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 146 | </tr> |
| 147 | |
| 148 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 149 | <td><a href="command-line-options.html#debug">-debug <var>events</var></a></td> |
| 150 | <td>display copious debugging information</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 151 | </tr> |
| 152 | |
| 153 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 154 | <td><a href="command-line-options.html#define">-define <var>format:option</var></a></td> |
| 155 | <td>define one or more image format options</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 156 | </tr> |
| 157 | |
| 158 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 159 | <td><a href="command-line-options.html#density">-density <var>geometry</var></a></td> |
| 160 | <td>horizontal and vertical density of the image</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 161 | </tr> |
| 162 | |
| 163 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 164 | <td><a href="command-line-options.html#depth">-depth <var>value</var></a></td> |
| 165 | <td>image depth</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 166 | </tr> |
| 167 | |
| 168 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 169 | <td><a href="command-line-options.html#dissimilarity-threshold">-dissimilarity-threshold <var>value</var></a></td> |
| 170 | <td>maximum distortion for (sub)image match (default 0.2)</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 171 | </tr> |
| 172 | |
| 173 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 174 | <td><a href="command-line-options.html#encipher">-encipher <var>filename</var></a></td> |
| 175 | <td>convert plain pixels to cipher pixels</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 176 | </tr> |
| 177 | |
| 178 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 179 | <td><a href="command-line-options.html#extract">-extract <var>geometry</var></a></td> |
| 180 | <td>extract area from image</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 181 | </tr> |
| 182 | |
| 183 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 184 | <td><a href="command-line-options.html#fuzz">-fuzz <var>distance</var></a></td> |
| 185 | <td>colors within this distance are considered equal</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 186 | </tr> |
| 187 | |
| 188 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 189 | <td><a href="command-line-options.html#help">-help</a></td> |
| 190 | <td>print program options</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 191 | </tr> |
| 192 | |
| 193 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 194 | <td><a href="command-line-options.html#highlight-color">-highlight-color <var>color</var></a></td> |
| 195 | <td>emphasize pixel differences with this color</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 196 | </tr> |
| 197 | |
| 198 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 199 | <td><a href="command-line-options.html#identify">-identify</a></td> |
| 200 | <td>identify the format and characteristics of the image</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 201 | </tr> |
| 202 | |
| 203 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 204 | <td><a href="command-line-options.html#interlace">-interlace <var>type</var></a></td> |
| 205 | <td>type of image interlacing scheme</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 206 | </tr> |
| 207 | |
| 208 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 209 | <td><a href="command-line-options.html#limit">-limit <var>type value</var></a></td> |
| 210 | <td>pixel cache resource limit</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 211 | </tr> |
| 212 | |
| 213 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 214 | <td><a href="command-line-options.html#log">-log <var>format</var></a></td> |
| 215 | <td>format of debugging information</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 216 | </tr> |
| 217 | |
| 218 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 219 | <td><a href="command-line-options.html#lowlight-color">-lowlight-color <var>color</var></a></td> |
| 220 | <td>de-emphasize pixel differences with this color</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 221 | </tr> |
| 222 | |
| 223 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 224 | <td><a href="command-line-options.html#metric">-metric <var>type</var></a></td> |
| 225 | <td>measure differences between images with this metric</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 226 | </tr> |
| 227 | |
| 228 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 229 | <td><a href="command-line-options.html#profile">-profile <var>filename</var></a></td> |
| 230 | <td>add, delete, or apply an image profile</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 231 | </tr> |
| 232 | |
| 233 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 234 | <td><a href="command-line-options.html#quality">-quality <var>value</var></a></td> |
| 235 | <td>JPEG/MIFF/PNG compression level</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 236 | </tr> |
| 237 | |
| 238 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 239 | <td><a href="command-line-options.html#quantize">-quantize <var>colorspace</var></a></td> |
| 240 | <td>reduce image colors in this colorspace</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 241 | </tr> |
| 242 | |
| 243 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 244 | <td><a href="command-line-options.html#quiet">-quiet</a></td> |
| 245 | <td>suppress all warning messages</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 246 | </tr> |
| 247 | |
| 248 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 249 | <td><a href="command-line-options.html#regard-warnings">-regard-warnings</a></td> |
| 250 | <td>pay attention to warning messages.</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 251 | </tr> |
| 252 | |
| 253 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 254 | <td><a href="command-line-options.html#respect-parentheses">-respect-parentheses</a></td> |
| 255 | <td>settings remain in effect until parenthesis boundary.</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 256 | </tr> |
| 257 | |
| 258 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 259 | <td><a href="command-line-options.html#sampling-factor">-sampling-factor <var>geometry</var></a></td> |
| 260 | <td>horizontal and vertical sampling factor</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 261 | </tr> |
| 262 | |
| 263 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 264 | <td><a href="command-line-options.html#seed">-seed <var>value</var></a></td> |
| 265 | <td>seed a new sequence of pseudo-random numbers</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 266 | </tr> |
| 267 | |
| 268 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 269 | <td><a href="command-line-options.html#set">-set <var>attribute value</var></a></td> |
| 270 | <td>set an image attribute</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 271 | </tr> |
| 272 | |
| 273 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 274 | <td><a href="command-line-options.html#similarity-threshold">-similarity-threshold <var>value</var></a></td> |
| 275 | <td>minimum distortion for (sub)image match (default 0.0)</td> |
cristy | 8ee7f24 | 2013-06-20 16:08:44 +0000 | [diff] [blame] | 276 | </tr> |
| 277 | |
| 278 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 279 | <td><a href="command-line-options.html#size">-size <var>geometry</var></a></td> |
| 280 | <td>width and height of image</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 281 | </tr> |
| 282 | |
| 283 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 284 | <td><a href="command-line-options.html#subimage-search">-subimage-search</a></td> |
| 285 | <td>search for subimage</td> |
cristy | ae6203d | 2010-08-09 01:12:14 +0000 | [diff] [blame] | 286 | </tr> |
| 287 | |
| 288 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 289 | <td><a href="command-line-options.html#synchronize">-synchronize</a></td> |
| 290 | <td>synchronize image to storage device</td> |
cristy | 5063d81 | 2010-10-19 16:28:10 +0000 | [diff] [blame] | 291 | </tr> |
| 292 | |
| 293 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 294 | <td><a href="command-line-options.html#taint">-taint</a></td> |
| 295 | <td>mark the image as modified</td> |
cristy | 5063d81 | 2010-10-19 16:28:10 +0000 | [diff] [blame] | 296 | </tr> |
| 297 | |
| 298 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 299 | <td><a href="command-line-options.html#transparent-color">-transparent-color <var>color</var></a></td> |
| 300 | <td>transparent color</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 301 | </tr> |
| 302 | |
| 303 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 304 | <td><a href="command-line-options.html#verbose">-verbose</a></td> |
| 305 | <td>print detailed information about the image</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 306 | </tr> |
| 307 | |
| 308 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 309 | <td><a href="command-line-options.html#version">-version</a></td> |
| 310 | <td>print version information</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 311 | </tr> |
| 312 | |
| 313 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 314 | <td><a href="command-line-options.html#virtual-pixel">-virtual-pixel <var>method</var></a></td> |
| 315 | <td>access method for pixels outside the boundaries of the image</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 316 | </tr> |
| 317 | |
| 318 | </tbody> |
| 319 | </table> |
cristy | 751980d | 2012-06-03 23:18:35 +0000 | [diff] [blame] | 320 | </div> |
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| 327 | <p><a href="compare.html#">Back to top</a> • |
cristy | ea2793e | 2015-05-31 16:52:26 +0000 | [diff] [blame] | 328 | <a href="http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x89AB63D48277377A">Public Key</a> • |
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cristy | ad41c0c | 2012-10-31 00:49:28 +0000 | [diff] [blame] | 333 | |
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