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 244 \r
 245 <h1>ImageMagick Identify Command-line Tool</h1>
 246 <p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
 247
 248 <div class="doc-section">
 249 <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>
 250 </div>
 251
 252 <h2><a id="usage"></a>Example Usage</h2>
 253 <div class="doc-section">
 254
 255 <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>
 256
 257 <p class='crt'><span class="crtprompt"> $ </span><span class='crtin'>identify rose.jpg</span><span class='crtout'> rose.jpg JPEG 640x480 DirectClass 87kb 0.050u 0:01</span></p>
 258 <p>Next, we look at the same image in greater detail:</p>
 259
 260 <p class='crt'><span class="crtprompt"> $ </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg  <br/>
 261     Format: JPEG (Joint Photographic Experts Group JFIF format)  <br/>
 262     Class: DirectClass  <br/>
 263     Geometry: 70x46+0+0  <br/>
 264     Resolution: 72x72  <br/>
 265     Print size: 0.972222x0.638889  <br/>
 266     Units: PixelsPerInch  <br/>
 267     Type: TrueColor  <br/>
 268     Endianess: Undefined  <br/>
 269     Colorspace: RGB  <br/>
 270     Depth: 8-bit  <br/>
 271     Channel depth:  <br/>
 272       red: 8-bit  <br/>
 273       green: 8-bit  <br/>
 274       blue: 8-bit  <br/>
 275     Channel statistics:  <br/>
 276       red:  <br/>
 277         min: 37 (0.145098)  <br/>
 278         max: 255 (1)  <br/>
 279         mean: 145.58 (0.5709)  <br/>
 280         standard deviation: 67.3195 (0.263998)  <br/>
 281       green:  <br/>
 282         min: 31 (0.121569)  <br/>
 283         max: 255 (1)  <br/>
 284         mean: 89.2512 (0.350005)  <br/>
 285         standard deviation: 52.0488 (0.204113)  <br/>
 286       blue:  <br/>
 287         min: 17 (0.0666667)  <br/>
 288         max: 255 (1)  <br/>
 289         mean: 80.4075 (0.315323)  <br/>
 290         standard deviation: 54.0052 (0.211785)  <br/>
 291     Rendering intent: Undefined  <br/>
 292     Interlace: None  <br/>
 293     Background color: white  <br/>
 294     Border color: rgb(223,223,223)  <br/>
 295     Matte color: grey74  <br/>
 296     Transparent color: black  <br/>
 297     Page geometry: 70x46+0+0  <br/>
 298     Dispose: Undefined  <br/>
 299     Iterations: 0  <br/>
 300     Compression: JPEG  <br/>
 301     Quality: 100  <br/>
 302     Orientation: Undefined  <br/>
 303     Properties:  <br/>
 304       date:create: 2008-01-08T11:08:52-05:00  <br/>
 305       date:modify: 2005-04-07T12:48:13-04:00  <br/>
 306       jpeg:colorspace: 2  <br/>
 307       jpeg:sampling-factor: 2x2,1x1,1x1  <br/>
 308       signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc  <br/>
 309     Artifacts:  <br/>
 310       verbose: true  <br/>
 311     Tainted: False  <br/>
 312     Filesize: 3.97266kb  <br/>
 313     Number pixels: 3.14453kb  <br/>
 314     Version: ImageMagick 6.7.5-0 2012-01-25 Q16 http://www.imagemagick.org</span></p>
 315 <p>To get the print size in inches of an image at 72 DPI, use:</p>
 316
 317 <p class='crt'><span class="crtprompt"> $ </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>
 318 <p>The depth and dimensions of a raw image must be specified on the command line:</p>
 319
 320 <p class='crt'><span class="crtprompt"> $ </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>
 321 <p>Here we display the image texture features and the number of unique colors in the image:</p>
 322
 323 <p class='crt'><span class="crtprompt"> $ </span><span class='crtin'>identify -verbose -features 1 -unique image.png</span></p>
 324 <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>
 325
 326 </div>
 327
 328 <h2><a id="options"></a>Option Summary</h2>
 329 <div class="doc-section">
 330
 331 <p>The <kbd>identify</kbd> command recognizes these options.  Click on an option to get more details about how that option works.</p>
 332
 333 <table class="doc">
 334   <tbody>
 335   <tr>
 336     <th align="left">Option</th>
 337     <th align="left">Description</th>
 338   </tr>
 339
 340   <tr>
 341     <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
 342     <td valign="top">on, activate, off, deactivate, set, opaque, copy",
 343 transparent, extract, background, or shape the alpha channel</td>
 344   </tr>
 345
 346   <tr>
 347     <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
 348     <td valign="top">remove pixel-aliasing</td>
 349   </tr>
 350
 351   <tr>
 352     <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
 353     <td valign="top">decrypt image with this password</td>
 354   </tr>
 355
 356   <tr>
 357     <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
 358     <td valign="top">apply option to select image channels</td>
 359   </tr>
 360
 361   <tr>
 362     <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
 363     <td valign="top">set image colorspace</td>
 364   </tr>
 365
 366   <tr>
 367     <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
 368     <td valign="top">crop the image</td>
 369   </tr>
 370
 371   <tr>
 372     <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
 373     <td valign="top">display copious debugging information</td>
 374   </tr>
 375
 376   <tr>
 377     <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
 378     <td valign="top">define one or more image format options</td>
 379   </tr>
 380
 381   <tr>
 382     <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
 383     <td valign="top">horizontal and vertical density of the image</td>
 384   </tr>
 385
 386   <tr>
 387     <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
 388     <td valign="top">image depth</td>
 389   </tr>
 390
 391   <tr>
 392     <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
 393     <td valign="top">extract area from image</td>
 394   </tr>
 395
 396   <tr>
 397     <td valign="top"><a href="../www/command-line-options.html#features">-features <em class="option">distance</em></a></td>
 398     <td valign="top">display image features (e.g. contract, correlations, etc.).</td>
 399   </tr>
 400
 401   <tr>
 402     <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
 403     <td valign="top">output formatted image characteristics</td>
 404   </tr>
 405
 406   <tr>
 407     <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
 408     <td valign="top">level of gamma correction</td>
 409   </tr>
 410
 411   <tr>
 412     <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
 413     <td valign="top">print program options</td>
 414   </tr>
 415
 416   <tr>
 417     <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
 418     <td valign="top">type of image interlacing scheme</td>
 419   </tr>
 420
 421   <tr>
 422     <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
 423     <td valign="top">pixel color interpolation method</td>
 424   </tr>
 425
 426   <tr>
 427     <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
 428     <td valign="top">pixel cache resource limit</td>
 429   </tr>
 430
 431   <tr>
 432     <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
 433     <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
 434   </tr>
 435
 436   <tr>
 437     <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
 438     <td valign="top">format of debugging information</td>
 439   </tr>
 440
 441   <tr>
 442     <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
 443     <td valign="top">monitor progress</td>
 444   </tr>
 445
 446   <tr>
 447     <td valign="top"><a href="../www/command-line-options.html#negate">-negate</a></td>
 448     <td valign="top">replace each pixel with its complementary color </td>
 449   </tr>
 450
 451   <tr>
 452     <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
 453     <td valign="top">suppress all warning messages</td>
 454   </tr>
 455
 456   <tr>
 457     <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
 458     <td valign="top">pay attention to warning messages.</td>
 459   </tr>
 460
 461   <tr>
 462     <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
 463     <td valign="top">settings remain in effect until parenthesis boundary.</td>
 464   </tr>
 465
 466   <tr>
 467     <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
 468     <td valign="top">horizontal and vertical sampling factor</td>
 469   </tr>
 470
 471   <tr>
 472     <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
 473     <td valign="top">set an image attribute</td>
 474   </tr>
 475
 476   <tr>
 477     <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
 478     <td valign="top">width and height of image</td>
 479   </tr>
 480
 481   <tr>
 482     <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
 483     <td valign="top">strip image of all profiles and comments</td>
 484   </tr>
 485
 486   <tr>
 487     <td valign="top"><a href="../www/command-line-options.html#unique">-unique</a></td>
 488     <td valign="top">display image the number of unique colors in the image.</td>
 489   </tr>
 490
 491   <tr>
 492     <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
 493     <td valign="top">the units of image resolution</td>
 494   </tr>
 495
 496   <tr>
 497     <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
 498     <td valign="top">print detailed information about the image</td>
 499   </tr>
 500
 501   <tr>
 502     <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
 503     <td valign="top">print version information</td>
 504   </tr>
 505
 506   <tr>
 507     <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
 508     <td valign="top">access method for pixels outside the boundaries of the image</td>
 509   </tr>
 510
 511   </tbody>
 512 </table>
 513
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