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cristy | ffb69ed | 2010-12-25 00:06:48 +0000 | [diff] [blame] | 7 | <title>ImageMagick: Command-line Tools: Compare</title> |
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| 57 | <div class="magick-header"> |
| 58 | <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] | 59 | |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 60 | <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> |
| 61 | |
| 62 | <h2 class="magick-header"><a id="usage"></a>Example Usage</h2> |
cristy | 751980d | 2012-06-03 23:18:35 +0000 | [diff] [blame] | 63 | |
cristy | 8ee7f24 | 2013-06-20 16:08:44 +0000 | [diff] [blame] | 64 | <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] | 65 | |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 66 | <pre> |
| 67 | convert rose.jpg -sharpen 0x1 reconstruct.jpg |
| 68 | compare rose.jpg reconstruct.jpg difference.png |
| 69 | compare -compose src rose.jpg reconstruct.jpg difference.png |
| 70 | </pre> |
| 71 | |
| 72 | <ul> |
| 73 | <a href="../images/rose.jpg"><img src="../images/rose.jpg" width="70" height="46" alt="rose"></a> |
| 74 | <a href="../images/reconstruct.jpg"><img src="../images/reconstruct.jpg" width="70" height="46" alt="rose"></a> |
| 75 | <img style="margin:13px 0;" src="../images/right.gif" width="20" height="20" alt="==>"> |
| 76 | <a href="../images/difference.png"><img src="../images/difference.png" width="70" height="46" alt="rose"></a> |
| 77 | </ul> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 78 | |
| 79 | <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> |
| 80 | |
| 81 | <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> |
| 82 | |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 83 | <pre> |
| 84 | -> compare -verbose -metric mae rose.jpg reconstruct.jpg difference.png |
| 85 | Image: rose.jpg |
| 86 | Channel distortion: MAE |
| 87 | red: 2282.91 (0.034835) |
| 88 | green: 1853.99 (0.0282901) |
| 89 | blue: 2008.67 (0.0306503) |
| 90 | all: 1536.39 (0.0234439) |
| 91 | </pre> |
| 92 | <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] | 93 | |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 94 | <pre> |
| 95 | -> compare -channel red -metric PSNR rose.jpg reconstruct.jpg difference.png |
| 96 | 19.63 |
| 97 | </pre> |
| 98 | |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 99 | <p>Or, if you just want the overall image distortion, use this command:</p> |
| 100 | |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 101 | <pre> |
| 102 | -> compare -metric PSNR rose.jpg reconstruct.jpg difference.png |
| 103 | 28.31 |
| 104 | </pre> |
| 105 | |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 106 | <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> |
| 107 | |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 108 | <pre> |
| 109 | -> compare -metric RMSE -subimage-search logo.png wizard.jpg similarity.gif |
| 110 | 85.05 (0.00129778) @ 353,157 |
| 111 | </pre> |
| 112 | |
cristy | 9146993 | 2014-07-25 11:00:25 +0000 | [diff] [blame] | 113 | <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] | 114 | |
| 115 | <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] | 116 | |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 117 | <h2 class="magick-header"><a id="options"></a>Option Summary</h2> |
cristy | 751980d | 2012-06-03 23:18:35 +0000 | [diff] [blame] | 118 | |
cristy | 8ee7f24 | 2013-06-20 16:08:44 +0000 | [diff] [blame] | 119 | <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] | 120 | |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 121 | <table class="table table-condensed table-striped"> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 122 | <tbody> |
| 123 | <tr> |
| 124 | <th align="left">Option</th> |
| 125 | <th align="left">Description</th> |
| 126 | </tr> |
| 127 | |
| 128 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 129 | <td><a href="command-line-options.html#alpha">-alpha</a></td> |
| 130 | <td>on, activate, off, deactivate, set, opaque, copy", |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 131 | transparent, extract, background, or shape the alpha channel</td> |
| 132 | </tr> |
| 133 | |
| 134 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 135 | <td><a href="command-line-options.html#authenticate">-authenticate <var>value</var></a></td> |
| 136 | <td>decrypt image with this password</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 137 | </tr> |
| 138 | |
| 139 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 140 | <td><a href="command-line-options.html#channel">-channel <var>type</var></a></td> |
| 141 | <td>apply option to select image channels</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 142 | </tr> |
| 143 | |
| 144 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 145 | <td><a href="command-line-options.html#colorspace">-colorspace <var>type</var></a></td> |
| 146 | <td>set image colorspace</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 147 | </tr> |
| 148 | |
| 149 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 150 | <td><a href="command-line-options.html#compose">-compose <var>operator</var></a></td> |
| 151 | <td>set image composite operator</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 152 | </tr> |
| 153 | |
| 154 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 155 | <td><a href="command-line-options.html#decipher">-decipher <var>filename</var></a></td> |
| 156 | <td>convert cipher pixels to plain</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 157 | </tr> |
| 158 | |
| 159 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 160 | <td><a href="command-line-options.html#debug">-debug <var>events</var></a></td> |
| 161 | <td>display copious debugging information</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 162 | </tr> |
| 163 | |
| 164 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 165 | <td><a href="command-line-options.html#define">-define <var>format:option</var></a></td> |
| 166 | <td>define one or more image format options</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 167 | </tr> |
| 168 | |
| 169 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 170 | <td><a href="command-line-options.html#density">-density <var>geometry</var></a></td> |
| 171 | <td>horizontal and vertical density of the image</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 172 | </tr> |
| 173 | |
| 174 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 175 | <td><a href="command-line-options.html#depth">-depth <var>value</var></a></td> |
| 176 | <td>image depth</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 177 | </tr> |
| 178 | |
| 179 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 180 | <td><a href="command-line-options.html#dissimilarity-threshold">-dissimilarity-threshold <var>value</var></a></td> |
| 181 | <td>maximum distortion for (sub)image match (default 0.2)</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 182 | </tr> |
| 183 | |
| 184 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 185 | <td><a href="command-line-options.html#encipher">-encipher <var>filename</var></a></td> |
| 186 | <td>convert plain pixels to cipher pixels</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 187 | </tr> |
| 188 | |
| 189 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 190 | <td><a href="command-line-options.html#extract">-extract <var>geometry</var></a></td> |
| 191 | <td>extract area from image</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 192 | </tr> |
| 193 | |
| 194 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 195 | <td><a href="command-line-options.html#fuzz">-fuzz <var>distance</var></a></td> |
| 196 | <td>colors within this distance are considered equal</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 197 | </tr> |
| 198 | |
| 199 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 200 | <td><a href="command-line-options.html#help">-help</a></td> |
| 201 | <td>print program options</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 202 | </tr> |
| 203 | |
| 204 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 205 | <td><a href="command-line-options.html#highlight-color">-highlight-color <var>color</var></a></td> |
| 206 | <td>emphasize pixel differences with this color</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 207 | </tr> |
| 208 | |
| 209 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 210 | <td><a href="command-line-options.html#identify">-identify</a></td> |
| 211 | <td>identify the format and characteristics of the image</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 212 | </tr> |
| 213 | |
| 214 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 215 | <td><a href="command-line-options.html#interlace">-interlace <var>type</var></a></td> |
| 216 | <td>type of image interlacing scheme</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 217 | </tr> |
| 218 | |
| 219 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 220 | <td><a href="command-line-options.html#limit">-limit <var>type value</var></a></td> |
| 221 | <td>pixel cache resource limit</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 222 | </tr> |
| 223 | |
| 224 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 225 | <td><a href="command-line-options.html#log">-log <var>format</var></a></td> |
| 226 | <td>format of debugging information</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 227 | </tr> |
| 228 | |
| 229 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 230 | <td><a href="command-line-options.html#lowlight-color">-lowlight-color <var>color</var></a></td> |
| 231 | <td>de-emphasize pixel differences with this color</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 232 | </tr> |
| 233 | |
| 234 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 235 | <td><a href="command-line-options.html#metric">-metric <var>type</var></a></td> |
| 236 | <td>measure differences between images with this metric</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 237 | </tr> |
| 238 | |
| 239 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 240 | <td><a href="command-line-options.html#profile">-profile <var>filename</var></a></td> |
| 241 | <td>add, delete, or apply an image profile</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 242 | </tr> |
| 243 | |
| 244 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 245 | <td><a href="command-line-options.html#quality">-quality <var>value</var></a></td> |
| 246 | <td>JPEG/MIFF/PNG compression level</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 247 | </tr> |
| 248 | |
| 249 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 250 | <td><a href="command-line-options.html#quantize">-quantize <var>colorspace</var></a></td> |
| 251 | <td>reduce image colors in this colorspace</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 252 | </tr> |
| 253 | |
| 254 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 255 | <td><a href="command-line-options.html#quiet">-quiet</a></td> |
| 256 | <td>suppress all warning messages</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 257 | </tr> |
| 258 | |
| 259 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 260 | <td><a href="command-line-options.html#regard-warnings">-regard-warnings</a></td> |
| 261 | <td>pay attention to warning messages.</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 262 | </tr> |
| 263 | |
| 264 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 265 | <td><a href="command-line-options.html#respect-parentheses">-respect-parentheses</a></td> |
| 266 | <td>settings remain in effect until parenthesis boundary.</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 267 | </tr> |
| 268 | |
| 269 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 270 | <td><a href="command-line-options.html#sampling-factor">-sampling-factor <var>geometry</var></a></td> |
| 271 | <td>horizontal and vertical sampling factor</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 272 | </tr> |
| 273 | |
| 274 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 275 | <td><a href="command-line-options.html#seed">-seed <var>value</var></a></td> |
| 276 | <td>seed a new sequence of pseudo-random numbers</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 277 | </tr> |
| 278 | |
| 279 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 280 | <td><a href="command-line-options.html#set">-set <var>attribute value</var></a></td> |
| 281 | <td>set an image attribute</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 282 | </tr> |
| 283 | |
| 284 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 285 | <td><a href="command-line-options.html#similarity-threshold">-similarity-threshold <var>value</var></a></td> |
| 286 | <td>minimum distortion for (sub)image match (default 0.0)</td> |
cristy | 8ee7f24 | 2013-06-20 16:08:44 +0000 | [diff] [blame] | 287 | </tr> |
| 288 | |
| 289 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 290 | <td><a href="command-line-options.html#size">-size <var>geometry</var></a></td> |
| 291 | <td>width and height of image</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 292 | </tr> |
| 293 | |
| 294 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 295 | <td><a href="command-line-options.html#subimage-search">-subimage-search</a></td> |
| 296 | <td>search for subimage</td> |
cristy | ae6203d | 2010-08-09 01:12:14 +0000 | [diff] [blame] | 297 | </tr> |
| 298 | |
| 299 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 300 | <td><a href="command-line-options.html#synchronize">-synchronize</a></td> |
| 301 | <td>synchronize image to storage device</td> |
cristy | 5063d81 | 2010-10-19 16:28:10 +0000 | [diff] [blame] | 302 | </tr> |
| 303 | |
| 304 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 305 | <td><a href="command-line-options.html#taint">-taint</a></td> |
| 306 | <td>mark the image as modified</td> |
cristy | 5063d81 | 2010-10-19 16:28:10 +0000 | [diff] [blame] | 307 | </tr> |
| 308 | |
| 309 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 310 | <td><a href="command-line-options.html#transparent-color">-transparent-color <var>color</var></a></td> |
| 311 | <td>transparent color</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 312 | </tr> |
| 313 | |
| 314 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 315 | <td><a href="command-line-options.html#verbose">-verbose</a></td> |
| 316 | <td>print detailed information about the image</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 317 | </tr> |
| 318 | |
| 319 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 320 | <td><a href="command-line-options.html#version">-version</a></td> |
| 321 | <td>print version information</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 322 | </tr> |
| 323 | |
| 324 | <tr> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 325 | <td><a href="command-line-options.html#virtual-pixel">-virtual-pixel <var>method</var></a></td> |
| 326 | <td>access method for pixels outside the boundaries of the image</td> |
cristy | 3ed852e | 2009-09-05 21:47:34 +0000 | [diff] [blame] | 327 | </tr> |
| 328 | |
| 329 | </tbody> |
| 330 | </table> |
cristy | 751980d | 2012-06-03 23:18:35 +0000 | [diff] [blame] | 331 | </div> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 332 | <footer class="magick-footer"> |
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cristy | 85893d3 | 2015-05-06 13:44:09 +0000 | [diff] [blame] | 334 | <a href="support.html">Donate</a> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 335 | </div> |
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cristy | 44443b9 | 2015-05-05 00:06:07 +0000 | [diff] [blame] | 337 | <a class="FlattrButton" style="display:none;" rev="flattr;button:compact;" href="../index.html"></a> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 338 | <noscript> |
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cristy | 85893d3 | 2015-05-06 13:44:09 +0000 | [diff] [blame] | 350 | <a href="http://www.imagemagick.org/script/contact.php">Contact Us</a></p> |
cristy | d243201 | 2015-05-04 23:15:15 +0000 | [diff] [blame] | 351 | </footer> |
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cristy | ad41c0c | 2012-10-31 00:49:28 +0000 | [diff] [blame] | 353 | |
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cristy | ad41c0c | 2012-10-31 00:49:28 +0000 | [diff] [blame] | 367 | </div> |
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cristy | 5a367e4 | 2015-05-05 12:39:18 +0000 | [diff] [blame] | 369 | </html> |