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 217 \r
 218 \r
 219 \r
 220 <h1>ImageMagick Identify Command-line Tool</h1>
 221 <p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
 222
 223 <div class="doc-section">
 224 <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>
 225 </div>
 226
 227 <h2><a id="usage"></a>Example Usage</h2>
 228 <div class="doc-section">
 229
 230 <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>
 231
 232 <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>
 233 <p>Next, we look at the same image in greater detail:</p>
 234
 235 <p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg  <br/>
 236     Format: JPEG (Joint Photographic Experts Group JFIF format)  <br/>
 237     Class: DirectClass  <br/>
 238     Geometry: 70x46+0+0  <br/>
 239     Resolution: 72x72  <br/>
 240     Print size: 0.972222x0.638889  <br/>
 241     Units: PixelsPerInch  <br/>
 242     Type: TrueColor  <br/>
 243     Endianess: Undefined  <br/>
 244     Colorspace: RGB  <br/>
 245     Depth: 8-bit  <br/>
 246     Channel depth:  <br/>
 247       red: 8-bit  <br/>
 248       green: 8-bit  <br/>
 249       blue: 8-bit  <br/>
 250     Channel statistics:  <br/>
 251       red:  <br/>
 252         min: 37 (0.145098)  <br/>
 253         max: 255 (1)  <br/>
 254         mean: 145.58 (0.5709)  <br/>
 255         standard deviation: 67.3195 (0.263998)  <br/>
 256       green:  <br/>
 257         min: 31 (0.121569)  <br/>
 258         max: 255 (1)  <br/>
 259         mean: 89.2512 (0.350005)  <br/>
 260         standard deviation: 52.0488 (0.204113)  <br/>
 261       blue:  <br/>
 262         min: 17 (0.0666667)  <br/>
 263         max: 255 (1)  <br/>
 264         mean: 80.4075 (0.315323)  <br/>
 265         standard deviation: 54.0052 (0.211785)  <br/>
 266     Rendering intent: Undefined  <br/>
 267     Interlace: None  <br/>
 268     Background color: white  <br/>
 269     Border color: rgb(223,223,223)  <br/>
 270     Matte color: grey74  <br/>
 271     Transparent color: black  <br/>
 272     Page geometry: 70x46+0+0  <br/>
 273     Dispose: Undefined  <br/>
 274     Iterations: 0  <br/>
 275     Compression: JPEG  <br/>
 276     Quality: 100  <br/>
 277     Orientation: Undefined  <br/>
 278     Properties:  <br/>
 279       date:create: 2008-01-08T11:08:52-05:00  <br/>
 280       date:modify: 2005-04-07T12:48:13-04:00  <br/>
 281       jpeg:colorspace: 2  <br/>
 282       jpeg:sampling-factor: 2x2,1x1,1x1  <br/>
 283       signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc  <br/>
 284     Artifacts:  <br/>
 285       verbose: true  <br/>
 286     Tainted: False  <br/>
 287     Filesize: 3.97266kb  <br/>
 288     Number pixels: 3.14453kb  <br/>
 289     Version: ImageMagick 6.7.1-5 2011-07-01 Q16 http://www.imagemagick.org</span></p>
 290 <p>To get the print size in inches of an image at 72 DPI, use:</p>
 291
 292 <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>
 293 <p>The depth and dimensions of a raw image must be specified on the command line:</p>
 294
 295 <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>
 296 <p>Here we display the image texture features and the number of unique colors in the image:</p>
 297
 298 <p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose -features 1 -unique image.png</span></p>
 299 <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>
 300
 301 </div>
 302
 303 <h2><a id="options"></a>Option Summary</h2>
 304 <div class="doc-section">
 305
 306 <p>The <kbd>identify</kbd> command recognizes these options.  Click on an option to get more details about how that option works.</p>
 307
 308 <table class="doc">
 309   <tbody>
 310   <tr>
 311     <th align="left">Option</th>
 312     <th align="left">Description</th>
 313   </tr>
 314
 315   <tr>
 316     <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
 317     <td valign="top">on, activate, off, deactivate, set, opaque, copy",
 318 transparent, extract, background, or shape the alpha channel</td>
 319   </tr>
 320
 321   <tr>
 322     <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
 323     <td valign="top">remove pixel-aliasing</td>
 324   </tr>
 325
 326   <tr>
 327     <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
 328     <td valign="top">decrypt image with this password</td>
 329   </tr>
 330
 331   <tr>
 332     <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
 333     <td valign="top">apply option to select image channels</td>
 334   </tr>
 335
 336   <tr>
 337     <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
 338     <td valign="top">set image colorspace</td>
 339   </tr>
 340
 341   <tr>
 342     <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
 343     <td valign="top">crop the image</td>
 344   </tr>
 345
 346   <tr>
 347     <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
 348     <td valign="top">display copious debugging information</td>
 349   </tr>
 350
 351   <tr>
 352     <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
 353     <td valign="top">define one or more image format options</td>
 354   </tr>
 355
 356   <tr>
 357     <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
 358     <td valign="top">horizontal and vertical density of the image</td>
 359   </tr>
 360
 361   <tr>
 362     <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
 363     <td valign="top">image depth</td>
 364   </tr>
 365
 366   <tr>
 367     <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
 368     <td valign="top">extract area from image</td>
 369   </tr>
 370
 371   <tr>
 372     <td valign="top"><a href="../www/command-line-options.html#features">-features <em class="option">distance</em></a></td>
 373     <td valign="top">display image features (e.g. contract, correlations, etc.).</td>
 374   </tr>
 375
 376   <tr>
 377     <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
 378     <td valign="top">output formatted image characteristics</td>
 379   </tr>
 380
 381   <tr>
 382     <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
 383     <td valign="top">level of gamma correction</td>
 384   </tr>
 385
 386   <tr>
 387     <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
 388     <td valign="top">print program options</td>
 389   </tr>
 390
 391   <tr>
 392     <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
 393     <td valign="top">type of image interlacing scheme</td>
 394   </tr>
 395
 396   <tr>
 397     <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
 398     <td valign="top">pixel color interpolation method</td>
 399   </tr>
 400
 401   <tr>
 402     <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
 403     <td valign="top">pixel cache resource limit</td>
 404   </tr>
 405
 406   <tr>
 407     <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
 408     <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
 409   </tr>
 410
 411   <tr>
 412     <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
 413     <td valign="top">format of debugging information</td>
 414   </tr>
 415
 416   <tr>
 417     <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
 418     <td valign="top">monitor progress</td>
 419   </tr>
 420
 421   <tr>
 422     <td valign="top"><a href="../www/command-line-options.html#negate">-negate</a></td>
 423     <td valign="top">replace each pixel with its complementary color </td>
 424   </tr>
 425
 426   <tr>
 427     <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
 428     <td valign="top">suppress all warning messages</td>
 429   </tr>
 430
 431   <tr>
 432     <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
 433     <td valign="top">pay attention to warning messages.</td>
 434   </tr>
 435
 436   <tr>
 437     <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
 438     <td valign="top">settings remain in effect until parenthesis boundary.</td>
 439   </tr>
 440
 441   <tr>
 442     <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
 443     <td valign="top">horizontal and vertical sampling factor</td>
 444   </tr>
 445
 446   <tr>
 447     <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
 448     <td valign="top">set an image attribute</td>
 449   </tr>
 450
 451   <tr>
 452     <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
 453     <td valign="top">width and height of image</td>
 454   </tr>
 455
 456   <tr>
 457     <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
 458     <td valign="top">strip image of all profiles and comments</td>
 459   </tr>
 460
 461   <tr>
 462     <td valign="top"><a href="../www/command-line-options.html#unique">-unique</a></td>
 463     <td valign="top">display image the number of unique colors in the image.</td>
 464   </tr>
 465
 466   <tr>
 467     <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
 468     <td valign="top">the units of image resolution</td>
 469   </tr>
 470
 471   <tr>
 472     <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
 473     <td valign="top">print detailed information about the image</td>
 474   </tr>
 475
 476   <tr>
 477     <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
 478     <td valign="top">print version information</td>
 479   </tr>
 480
 481   <tr>
 482     <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
 483     <td valign="top">access method for pixels outside the boundaries of the image</td>
 484   </tr>
 485
 486   </tbody>
 487 </table>
 488
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