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 218 \r
 219 <h1>ImageMagick Identify Command-line Tool</h1>
 220 <p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
 221
 222 <div class="doc-section">
 223 <p>The <kbd>identify</kbd> program describes the format and characteristics of one or more image files. It also reports if an image is incomplete or corrupt. The information returned includes the image number, the file name, the width and height of the image, whether the image is colormapped or not, the number of colors in the image, the number of bytes in the image, the format of the image (JPEG, PNM, etc.), and finally the number of seconds it took to read and process the image.  Many more attributes are available with the verbose option.  See <a href="../www/command-line-processing.html">Command Line Processing</a> for advice on how to structure your <kbd>identify</kbd> command or see below for example usages of the command.</p>
 224 </div>
 225
 226 <h2><a id="usage"></a>Example Usage</h2>
 227 <div class="doc-section">
 228
 229 <p>We list a few examples of the <kbd>identify</kbd> command here to illustrate its usefulness and ease of use. To get started, lets identify an image in the JPEG format:</p>
 230
 231 <p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify rose.jpg</span><span class='crtout'> rose.jpg JPEG 640x480 DirectClass 87kb 0.050u 0:01</span></p>
 232 <p>Next, we look at the same image in greater detail:</p>
 233
 234 <p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg  <br/>
 235     Format: JPEG (Joint Photographic Experts Group JFIF format)  <br/>
 236     Class: DirectClass  <br/>
 237     Geometry: 70x46+0+0  <br/>
 238     Resolution: 72x72  <br/>
 239     Print size: 0.972222x0.638889  <br/>
 240     Units: PixelsPerInch  <br/>
 241     Type: TrueColor  <br/>
 242     Endianess: Undefined  <br/>
 243     Colorspace: RGB  <br/>
 244     Depth: 8-bit  <br/>
 245     Channel depth:  <br/>
 246       red: 8-bit  <br/>
 247       green: 8-bit  <br/>
 248       blue: 8-bit  <br/>
 249     Channel statistics:  <br/>
 250       red:  <br/>
 251         min: 37 (0.145098)  <br/>
 252         max: 255 (1)  <br/>
 253         mean: 145.58 (0.5709)  <br/>
 254         standard deviation: 67.3195 (0.263998)  <br/>
 255       green:  <br/>
 256         min: 31 (0.121569)  <br/>
 257         max: 255 (1)  <br/>
 258         mean: 89.2512 (0.350005)  <br/>
 259         standard deviation: 52.0488 (0.204113)  <br/>
 260       blue:  <br/>
 261         min: 17 (0.0666667)  <br/>
 262         max: 255 (1)  <br/>
 263         mean: 80.4075 (0.315323)  <br/>
 264         standard deviation: 54.0052 (0.211785)  <br/>
 265     Rendering intent: Undefined  <br/>
 266     Interlace: None  <br/>
 267     Background color: white  <br/>
 268     Border color: rgb(223,223,223)  <br/>
 269     Matte color: grey74  <br/>
 270     Transparent color: black  <br/>
 271     Page geometry: 70x46+0+0  <br/>
 272     Dispose: Undefined  <br/>
 273     Iterations: 0  <br/>
 274     Compression: JPEG  <br/>
 275     Quality: 100  <br/>
 276     Orientation: Undefined  <br/>
 277     Properties:  <br/>
 278       date:create: 2008-01-08T11:08:52-05:00  <br/>
 279       date:modify: 2005-04-07T12:48:13-04:00  <br/>
 280       jpeg:colorspace: 2  <br/>
 281       jpeg:sampling-factor: 2x2,1x1,1x1  <br/>
 282       signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc  <br/>
 283     Artifacts:  <br/>
 284       verbose: true  <br/>
 285     Tainted: False  <br/>
 286     Filesize: 3.97266kb  <br/>
 287     Number pixels: 3.14453kb  <br/>
 288     Version: ImageMagick 6.7.0-9 2011-06-03 Q16 http://www.imagemagick.org</span></p>
 289 <p>To get the print size in inches of an image at 72 DPI, use:</p>
 290
 291 <p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -format "%[fx:w/72] by %[fx:h/72] inches" document.png</span><span class='crtout'>8.5 x 11 inches</span></p>
 292 <p>The depth and dimensions of a raw image must be specified on the command line:</p>
 293
 294 <p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -depth 8 -size 640x480 image.raw</span><span class='crtout'>image.raw RGB 640x480 DirectClass 9kb 0.000u 0:01</span></p>
 295 <p>Here we display the image texture features and the number of unique colors in the image:</p>
 296
 297 <p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose -features 1 -unique image.png</span></p>
 298 <p>You can find additional examples of using <kbd>identify</kbd> in <a href="http://www.imagemagick.org/Usage/">Examples of ImageMagick Usage</a>.</p>
 299
 300 </div>
 301
 302 <h2><a id="options"></a>Option Summary</h2>
 303 <div class="doc-section">
 304
 305 <p>The <kbd>identify</kbd> command recognizes these options.  Click on an option to get more details about how that option works.</p>
 306
 307 <table class="doc">
 308   <tbody>
 309   <tr>
 310     <th align="left">Option</th>
 311     <th align="left">Description</th>
 312   </tr>
 313
 314   <tr>
 315     <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
 316     <td valign="top">on, activate, off, deactivate, set, opaque, copy",
 317 transparent, extract, background, or shape the alpha channel</td>
 318   </tr>
 319
 320   <tr>
 321     <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
 322     <td valign="top">remove pixel-aliasing</td>
 323   </tr>
 324
 325   <tr>
 326     <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
 327     <td valign="top">decrypt image with this password</td>
 328   </tr>
 329
 330   <tr>
 331     <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
 332     <td valign="top">apply option to select image channels</td>
 333   </tr>
 334
 335   <tr>
 336     <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
 337     <td valign="top">set image colorspace</td>
 338   </tr>
 339
 340   <tr>
 341     <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
 342     <td valign="top">crop the image</td>
 343   </tr>
 344
 345   <tr>
 346     <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
 347     <td valign="top">display copious debugging information</td>
 348   </tr>
 349
 350   <tr>
 351     <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
 352     <td valign="top">define one or more image format options</td>
 353   </tr>
 354
 355   <tr>
 356     <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
 357     <td valign="top">horizontal and vertical density of the image</td>
 358   </tr>
 359
 360   <tr>
 361     <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
 362     <td valign="top">image depth</td>
 363   </tr>
 364
 365   <tr>
 366     <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
 367     <td valign="top">extract area from image</td>
 368   </tr>
 369
 370   <tr>
 371     <td valign="top"><a href="../www/command-line-options.html#features">-features <em class="option">distance</em></a></td>
 372     <td valign="top">display image features (e.g. contract, correlations, etc.).</td>
 373   </tr>
 374
 375   <tr>
 376     <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
 377     <td valign="top">output formatted image characteristics</td>
 378   </tr>
 379
 380   <tr>
 381     <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
 382     <td valign="top">level of gamma correction</td>
 383   </tr>
 384
 385   <tr>
 386     <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
 387     <td valign="top">print program options</td>
 388   </tr>
 389
 390   <tr>
 391     <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
 392     <td valign="top">type of image interlacing scheme</td>
 393   </tr>
 394
 395   <tr>
 396     <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
 397     <td valign="top">pixel color interpolation method</td>
 398   </tr>
 399
 400   <tr>
 401     <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
 402     <td valign="top">pixel cache resource limit</td>
 403   </tr>
 404
 405   <tr>
 406     <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
 407     <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
 408   </tr>
 409
 410   <tr>
 411     <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
 412     <td valign="top">format of debugging information</td>
 413   </tr>
 414
 415   <tr>
 416     <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
 417     <td valign="top">monitor progress</td>
 418   </tr>
 419
 420   <tr>
 421     <td valign="top"><a href="../www/command-line-options.html#negate">-negate</a></td>
 422     <td valign="top">replace each pixel with its complementary color </td>
 423   </tr>
 424
 425   <tr>
 426     <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
 427     <td valign="top">suppress all warning messages</td>
 428   </tr>
 429
 430   <tr>
 431     <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
 432     <td valign="top">pay attention to warning messages.</td>
 433   </tr>
 434
 435   <tr>
 436     <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
 437     <td valign="top">settings remain in effect until parenthesis boundary.</td>
 438   </tr>
 439
 440   <tr>
 441     <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
 442     <td valign="top">horizontal and vertical sampling factor</td>
 443   </tr>
 444
 445   <tr>
 446     <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
 447     <td valign="top">set an image attribute</td>
 448   </tr>
 449
 450   <tr>
 451     <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
 452     <td valign="top">width and height of image</td>
 453   </tr>
 454
 455   <tr>
 456     <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
 457     <td valign="top">strip image of all profiles and comments</td>
 458   </tr>
 459
 460   <tr>
 461     <td valign="top"><a href="../www/command-line-options.html#unique">-unique</a></td>
 462     <td valign="top">display image the number of unique colors in the image.</td>
 463   </tr>
 464
 465   <tr>
 466     <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
 467     <td valign="top">the units of image resolution</td>
 468   </tr>
 469
 470   <tr>
 471     <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
 472     <td valign="top">print detailed information about the image</td>
 473   </tr>
 474
 475   <tr>
 476     <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
 477     <td valign="top">print version information</td>
 478   </tr>
 479
 480   <tr>
 481     <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
 482     <td valign="top">access method for pixels outside the boundaries of the image</td>
 483   </tr>
 484
 485   </tbody>
 486 </table>
 487
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