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 241 <h1>ImageMagick Identify Command-line Tool</h1>
 242 <p class="navigation-index">[<a href="identify.html#usage">Example Usage</a> &bull; <a href="identify.html#options">Option Summary</a>]</p>
 243
 244 <div class="doc-section">
 245 <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="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>
 246 </div>
 247
 248 <h2><a id="usage"></a>Example Usage</h2>
 249 <div class="doc-section">
 250
 251 <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>
 252
 253 <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>
 254 <p>Next, we look at the same image in greater detail:</p>
 255
 256 <p class='crt'><span class="crtprompt"> $ </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg  <br/>
 257     Format: JPEG (Joint Photographic Experts Group JFIF format)  <br/>
 258     Class: DirectClass  <br/>
 259     Geometry: 70x46+0+0  <br/>
 260     Resolution: 72x72  <br/>
 261     Print size: 0.972222x0.638889  <br/>
 262     Units: PixelsPerInch  <br/>
 263     Type: TrueColor  <br/>
 264     Endianess: Undefined  <br/>
 265     Colorspace: RGB  <br/>
 266     Depth: 8-bit  <br/>
 267     Channel depth:  <br/>
 268       red: 8-bit  <br/>
 269       green: 8-bit  <br/>
 270       blue: 8-bit  <br/>
 271     Channel statistics:  <br/>
 272       red:  <br/>
 273         min: 37 (0.145098)  <br/>
 274         max: 255 (1)  <br/>
 275         mean: 145.58 (0.5709)  <br/>
 276         standard deviation: 67.3195 (0.263998)  <br/>
 277       green:  <br/>
 278         min: 31 (0.121569)  <br/>
 279         max: 255 (1)  <br/>
 280         mean: 89.2512 (0.350005)  <br/>
 281         standard deviation: 52.0488 (0.204113)  <br/>
 282       blue:  <br/>
 283         min: 17 (0.0666667)  <br/>
 284         max: 255 (1)  <br/>
 285         mean: 80.4075 (0.315323)  <br/>
 286         standard deviation: 54.0052 (0.211785)  <br/>
 287     Rendering intent: Undefined  <br/>
 288     Interlace: None  <br/>
 289     Background color: white  <br/>
 290     Border color: rgb(223,223,223)  <br/>
 291     Matte color: grey74  <br/>
 292     Transparent color: black  <br/>
 293     Page geometry: 70x46+0+0  <br/>
 294     Dispose: Undefined  <br/>
 295     Iterations: 0  <br/>
 296     Compression: JPEG  <br/>
 297     Quality: 100  <br/>
 298     Orientation: Undefined  <br/>
 299     Properties:  <br/>
 300       date:create: 2008-01-08T11:08:52-05:00  <br/>
 301       date:modify: 2005-04-07T12:48:13-04:00  <br/>
 302       jpeg:colorspace: 2  <br/>
 303       jpeg:sampling-factor: 2x2,1x1,1x1  <br/>
 304       signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc  <br/>
 305     Artifacts:  <br/>
 306       verbose: true  <br/>
 307     Tainted: False  <br/>
 308     Filesize: 3.97266kb  <br/>
 309     Number pixels: 3.14453kb  <br/>
 310     Version: ImageMagick 6.7.7-5 2012-05-18 Q16 http://www.imagemagick.org</span></p>
 311 <p>To get the print size in inches of an image at 72 DPI, use:</p>
 312
 313 <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>
 314 <p>The depth and dimensions of a raw image must be specified on the command line:</p>
 315
 316 <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>
 317 <p>Here we display the image texture features and the number of unique colors in the image:</p>
 318
 319 <p class='crt'><span class="crtprompt"> $ </span><span class='crtin'>identify -verbose -features 1 -unique image.png</span></p>
 320 <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>
 321
 322 </div>
 323
 324 <h2><a id="options"></a>Option Summary</h2>
 325 <div class="doc-section">
 326
 327 <p>The <kbd>identify</kbd> command recognizes these options.  Click on an option to get more details about how that option works.</p>
 328
 329 <table class="doc">
 330   <tbody>
 331   <tr>
 332     <th align="left">Option</th>
 333     <th align="left">Description</th>
 334   </tr>
 335
 336   <tr>
 337     <td valign="top"><a href="command-line-options.html#alpha">-alpha</a></td>
 338     <td valign="top">on, activate, off, deactivate, set, opaque, copy",
 339 transparent, extract, background, or shape the alpha channel</td>
 340   </tr>
 341
 342   <tr>
 343     <td valign="top"><a href="command-line-options.html#antialias">-antialias</a></td>
 344     <td valign="top">remove pixel-aliasing</td>
 345   </tr>
 346
 347   <tr>
 348     <td valign="top"><a href="command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
 349     <td valign="top">decrypt image with this password</td>
 350   </tr>
 351
 352   <tr>
 353     <td valign="top"><a href="command-line-options.html#channel">-channel <em class="option">type</em></a></td>
 354     <td valign="top">apply option to select image channels</td>
 355   </tr>
 356
 357   <tr>
 358     <td valign="top"><a href="command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
 359     <td valign="top">set image colorspace</td>
 360   </tr>
 361
 362   <tr>
 363     <td valign="top"><a href="command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
 364     <td valign="top">crop the image</td>
 365   </tr>
 366
 367   <tr>
 368     <td valign="top"><a href="command-line-options.html#debug">-debug <em class="option">events</em></a></td>
 369     <td valign="top">display copious debugging information</td>
 370   </tr>
 371
 372   <tr>
 373     <td valign="top"><a href="command-line-options.html#define">-define <em class="option">format:option</em></a></td>
 374     <td valign="top">define one or more image format options</td>
 375   </tr>
 376
 377   <tr>
 378     <td valign="top"><a href="command-line-options.html#density">-density <em class="option">geometry</em></a></td>
 379     <td valign="top">horizontal and vertical density of the image</td>
 380   </tr>
 381
 382   <tr>
 383     <td valign="top"><a href="command-line-options.html#depth">-depth <em class="option">value</em></a></td>
 384     <td valign="top">image depth</td>
 385   </tr>
 386
 387   <tr>
 388     <td valign="top"><a href="command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
 389     <td valign="top">extract area from image</td>
 390   </tr>
 391
 392   <tr>
 393     <td valign="top"><a href="command-line-options.html#features">-features <em class="option">distance</em></a></td>
 394     <td valign="top">display image features (e.g. contract, correlations, etc.).</td>
 395   </tr>
 396
 397   <tr>
 398     <td valign="top"><a href="command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
 399     <td valign="top">output formatted image characteristics</td>
 400   </tr>
 401
 402   <tr>
 403     <td valign="top"><a href="command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
 404     <td valign="top">level of gamma correction</td>
 405   </tr>
 406
 407   <tr>
 408     <td valign="top"><a href="command-line-options.html#help">-help</a></td>
 409     <td valign="top">print program options</td>
 410   </tr>
 411
 412   <tr>
 413     <td valign="top"><a href="command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
 414     <td valign="top">type of image interlacing scheme</td>
 415   </tr>
 416
 417   <tr>
 418     <td valign="top"><a href="command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
 419     <td valign="top">pixel color interpolation method</td>
 420   </tr>
 421
 422   <tr>
 423     <td valign="top"><a href="command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
 424     <td valign="top">pixel cache resource limit</td>
 425   </tr>
 426
 427   <tr>
 428     <td valign="top"><a href="command-line-options.html#list">-list <em class="option">type</em></a></td>
 429     <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
 430   </tr>
 431
 432   <tr>
 433     <td valign="top"><a href="command-line-options.html#log">-log <em class="option">format</em></a></td>
 434     <td valign="top">format of debugging information</td>
 435   </tr>
 436
 437   <tr>
 438     <td valign="top"><a href="command-line-options.html#monitor">-monitor</a></td>
 439     <td valign="top">monitor progress</td>
 440   </tr>
 441
 442   <tr>
 443     <td valign="top"><a href="command-line-options.html#negate">-negate</a></td>
 444     <td valign="top">replace each pixel with its complementary color </td>
 445   </tr>
 446
 447   <tr>
 448     <td valign="top"><a href="command-line-options.html#quiet">-quiet</a></td>
 449     <td valign="top">suppress all warning messages</td>
 450   </tr>
 451
 452   <tr>
 453     <td valign="top"><a href="command-line-options.html#regard-warnings">-regard-warnings</a></td>
 454     <td valign="top">pay attention to warning messages.</td>
 455   </tr>
 456
 457   <tr>
 458     <td valign="top"><a href="command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
 459     <td valign="top">settings remain in effect until parenthesis boundary.</td>
 460   </tr>
 461
 462   <tr>
 463     <td valign="top"><a href="command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
 464     <td valign="top">horizontal and vertical sampling factor</td>
 465   </tr>
 466
 467   <tr>
 468     <td valign="top"><a href="command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
 469     <td valign="top">set an image attribute</td>
 470   </tr>
 471
 472   <tr>
 473     <td valign="top"><a href="command-line-options.html#size">-size <em class="option">geometry</em></a></td>
 474     <td valign="top">width and height of image</td>
 475   </tr>
 476
 477   <tr>
 478     <td valign="top"><a href="command-line-options.html#strip">-strip</a></td>
 479     <td valign="top">strip image of all profiles and comments</td>
 480   </tr>
 481
 482   <tr>
 483     <td valign="top"><a href="command-line-options.html#unique">-unique</a></td>
 484     <td valign="top">display image the number of unique colors in the image.</td>
 485   </tr>
 486
 487   <tr>
 488     <td valign="top"><a href="command-line-options.html#units">-units <em class="option">type</em></a></td>
 489     <td valign="top">the units of image resolution</td>
 490   </tr>
 491
 492   <tr>
 493     <td valign="top"><a href="command-line-options.html#verbose">-verbose</a></td>
 494     <td valign="top">print detailed information about the image</td>
 495   </tr>
 496
 497   <tr>
 498     <td valign="top"><a href="command-line-options.html#version">-version</a></td>
 499     <td valign="top">print version information</td>
 500   </tr>
 501
 502   <tr>
 503     <td valign="top"><a href="command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
 504     <td valign="top">access method for pixels outside the boundaries of the image</td>
 505   </tr>
 506
 507   </tbody>
 508 </table>
 509
 510 </div>
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