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 176
 177
 178
 179 <h1>ImageMagick Identify Command-line Tool</h1>
 180 <p class="navigation-index">[<a href="identify.html#usage">Example Usage</a> • <a href="identify.html#options">Option Summary</a>]</p>
 181
 182 <div class="doc-section">
 183 <p>The <code>identify</code> 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 <code>identify</code> command or see below for example usages of the command.</p>
 184 </div>
 185
 186 <h2><a id="usage"></a>Example Usage</h2>
 187 <div class="doc-section">
 188
 189 <p>We list a few examples of the <code>identify</code> command here to illustrate its usefulness and ease of use. To get started, lets identify an image in the JPEG format:</p>
 190
 191 <p class="crt"><span class="crtprompt"> $ </span><span class="crtin">identify rose.jpg</span><span class="crtout"> rose.jpg JPEG 640x480 sRGB 87kb 0.050u 0:01</span></p>
 192 <p>Next, we look at the same image in greater detail:</p>
 193
 194 <p class="crt"><span class="crtprompt"> $ </span><span class="crtin">identify -verbose rose.jpg</span><span class="crtout">Image: rose.jpg  <br></br>
 195     Format: JPEG (Joint Photographic Experts Group JFIF format)  <br></br>
 196     Class: DirectClass  <br></br>
 197     Geometry: 70x46+0+0  <br></br>
 198     Resolution: 72x72  <br></br>
 199     Print size: 0.972222x0.638889  <br></br>
 200     Units: PixelsPerInch  <br></br>
 201     Type: TrueColor  <br></br>
 202     Endianess: Undefined  <br></br>
 203     Colorspace: RGB  <br></br>
 204     Depth: 8-bit  <br></br>
 205     Channel depth:  <br></br>
 206       red: 8-bit  <br></br>
 207       green: 8-bit  <br></br>
 208       blue: 8-bit  <br></br>
 209     Channel statistics:  <br></br>
 210       red:  <br></br>
 211         min: 37 (0.145098)  <br></br>
 212         max: 255 (1)  <br></br>
 213         mean: 145.58 (0.5709)  <br></br>
 214         standard deviation: 67.3195 (0.263998)  <br></br>
 215       green:  <br></br>
 216         min: 31 (0.121569)  <br></br>
 217         max: 255 (1)  <br></br>
 218         mean: 89.2512 (0.350005)  <br></br>
 219         standard deviation: 52.0488 (0.204113)  <br></br>
 220       blue:  <br></br>
 221         min: 17 (0.0666667)  <br></br>
 222         max: 255 (1)  <br></br>
 223         mean: 80.4075 (0.315323)  <br></br>
 224         standard deviation: 54.0052 (0.211785)  <br></br>
 225     Rendering intent: Undefined  <br></br>
 226     Interlace: None  <br></br>
 227     Background color: white  <br></br>
 228     Border color: rgb(223,223,223)  <br></br>
 229     Matte color: grey74  <br></br>
 230     Transparent color: black  <br></br>
 231     Page geometry: 70x46+0+0  <br></br>
 232     Dispose: Undefined  <br></br>
 233     Iterations: 0  <br></br>
 234     Compression: JPEG  <br></br>
 235     Quality: 100  <br></br>
 236     Orientation: Undefined  <br></br>
 237     Properties:  <br></br>
 238       date:create: 2008-01-08T11:08:52-05:00  <br></br>
 239       date:modify: 2005-04-07T12:48:13-04:00  <br></br>
 240       jpeg:colorspace: 2  <br></br>
 241       jpeg:sampling-factor: 2x2,1x1,1x1  <br></br>
 242       signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc  <br></br>
 243     Artifacts:  <br></br>
 244       verbose: true  <br></br>
 245     Tainted: False  <br></br>
 246     Filesize: 3.97266kb  <br></br>
 247     Number pixels: 3.14453kb  <br></br>
 248     Version: ImageMagick 6.8.6-8 2013-07-15 Q16 http://www.imagemagick.org</span></p>
 249 <p>To get the print size in inches of an image at 72 DPI, use:</p>
 250
 251 <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>
 252 <p>The depth and dimensions of a raw image must be specified on the command line:</p>
 253
 254 <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 sRGB 9kb 0.000u 0:01</span></p>
 255 <p>Here we display the image texture features and the number of unique colors in the image:</p>
 256
 257 <p class="crt"><span class="crtprompt"> $ </span><span class="crtin">identify -verbose -features 1 -unique image.png</span></p>
 258 <p>You can find additional examples of using <code>identify</code> in <a href="http://www.imagemagick.org/Usage/">Examples of ImageMagick Usage</a>.</p>
 259
 260 </div>
 261
 262 <h2><a id="options"></a>Option Summary</h2>
 263 <div class="doc-section">
 264
 265 <p>The <code>identify</code> command recognizes these options.  Click on an option to get more details about how that option works.</p>
 266
 267 <table class="doc">
 268   <tbody>
 269   <tr>
 270     <th align="left">Option</th>
 271     <th align="left">Description</th>
 272   </tr>
 273
 274   <tr>
 275     <td valign="top"><a href="command-line-options.html#alpha">-alpha</a></td>
 276     <td valign="top">on, activate, off, deactivate, set, opaque, copy",
 277 transparent, extract, background, or shape the alpha channel</td>
 278   </tr>
 279
 280   <tr>
 281     <td valign="top"><a href="command-line-options.html#antialias">-antialias</a></td>
 282     <td valign="top">remove pixel-aliasing</td>
 283   </tr>
 284
 285   <tr>
 286     <td valign="top"><a href="command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
 287     <td valign="top">decrypt image with this password</td>
 288   </tr>
 289
 290   <tr>
 291     <td valign="top"><a href="command-line-options.html#channel">-channel <em class="option">type</em></a></td>
 292     <td valign="top">apply option to select image channels</td>
 293   </tr>
 294
 295   <tr>
 296     <td valign="top"><a href="command-line-options.html#clip">-clip</a></td>
 297     <td valign="top">clip along the first path from the 8BIM profile</td>
 298   </tr>
 299
 300   <tr>
 301     <td valign="top"><a href="command-line-options.html#clip-mask">-clip-mask</a> <em class="option">filename</em></td>
 302     <td valign="top">associate clip mask with the image</td>
 303   </tr>
 304
 305   <tr>
 306     <td valign="top"><a href="command-line-options.html#clip-path">-clip-path <em class="option">id</em></a></td>
 307     <td valign="top">clip along a named path from the 8BIM profile</td>
 308   </tr>
 309
 310   <tr>
 311     <td valign="top"><a href="command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
 312     <td valign="top">set image colorspace</td>
 313   </tr>
 314
 315   <tr>
 316     <td valign="top"><a href="command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
 317     <td valign="top">crop the image</td>
 318   </tr>
 319
 320   <tr>
 321     <td valign="top"><a href="command-line-options.html#debug">-debug <em class="option">events</em></a></td>
 322     <td valign="top">display copious debugging information</td>
 323   </tr>
 324
 325   <tr>
 326     <td valign="top"><a href="command-line-options.html#define">-define <em class="option">format:option</em></a></td>
 327     <td valign="top">define one or more image format options</td>
 328   </tr>
 329
 330   <tr>
 331     <td valign="top"><a href="command-line-options.html#density">-density <em class="option">geometry</em></a></td>
 332     <td valign="top">horizontal and vertical density of the image</td>
 333   </tr>
 334
 335   <tr>
 336     <td valign="top"><a href="command-line-options.html#depth">-depth <em class="option">value</em></a></td>
 337     <td valign="top">image depth</td>
 338   </tr>
 339
 340   <tr>
 341     <td valign="top"><a href="command-line-options.html#endian">-endian <em class="option">type</em></a></td>
 342     <td valign="top">endianness (MSB or LSB) of the image</td>
 343   </tr>
 344
 345   <tr>
 346     <td valign="top"><a href="command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
 347     <td valign="top">extract area from image</td>
 348   </tr>
 349
 350   <tr>
 351     <td valign="top"><a href="command-line-options.html#features">-features <em class="option">distance</em></a></td>
 352     <td valign="top">analyze image features (e.g. contract, correlations, etc.).</td>
 353   </tr>
 354
 355   <tr>
 356     <td valign="top"><a href="command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
 357     <td valign="top">output formatted image characteristics</td>
 358   </tr>
 359
 360   <tr>
 361     <td valign="top"><a href="command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
 362     <td valign="top">level of gamma correction</td>
 363   </tr>
 364
 365   <tr>
 366     <td valign="top"><a href="command-line-options.html#help">-help</a></td>
 367     <td valign="top">print program options</td>
 368   </tr>
 369
 370   <tr>
 371     <td valign="top"><a href="command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
 372     <td valign="top">type of image interlacing scheme</td>
 373   </tr>
 374
 375   <tr>
 376     <td valign="top"><a href="command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
 377     <td valign="top">pixel color interpolation method</td>
 378   </tr>
 379
 380   <tr>
 381     <td valign="top"><a href="command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
 382     <td valign="top">pixel cache resource limit</td>
 383   </tr>
 384
 385   <tr>
 386     <td valign="top"><a href="command-line-options.html#list">-list <em class="option">type</em></a></td>
 387     <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
 388   </tr>
 389
 390   <tr>
 391     <td valign="top"><a href="command-line-options.html#log">-log <em class="option">format</em></a></td>
 392     <td valign="top">format of debugging information</td>
 393   </tr>
 394
 395   <tr>
 396     <td valign="top"><a href="command-line-options.html#mask">-mask <em class="option">filename</em></a></td>
 397     <td valign="top">associate a mask with the image</td>
 398   </tr>
 399
 400   <tr>
 401     <td valign="top"><a href="command-line-options.html#monitor">-monitor</a></td>
 402     <td valign="top">monitor progress</td>
 403   </tr>
 404
 405   <tr>
 406     <td valign="top"><a href="command-line-options.html#negate">-negate</a></td>
 407     <td valign="top">replace each pixel with its complementary color </td>
 408   </tr>
 409
 410   <tr>
 411     <td valign="top"><a href="command-line-options.html#quiet">-quiet</a></td>
 412     <td valign="top">suppress all warning messages</td>
 413   </tr>
 414
 415   <tr>
 416     <td valign="top"><a href="command-line-options.html#regard-warnings">-regard-warnings</a></td>
 417     <td valign="top">pay attention to warning messages.</td>
 418   </tr>
 419
 420   <tr>
 421     <td valign="top"><a href="command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
 422     <td valign="top">settings remain in effect until parenthesis boundary.</td>
 423   </tr>
 424
 425   <tr>
 426     <td valign="top"><a href="command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
 427     <td valign="top">horizontal and vertical sampling factor</td>
 428   </tr>
 429
 430   <tr>
 431     <td valign="top"><a href="command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
 432     <td valign="top">set an image attribute</td>
 433   </tr>
 434
 435   <tr>
 436     <td valign="top"><a href="command-line-options.html#size">-size <em class="option">geometry</em></a></td>
 437     <td valign="top">width and height of image</td>
 438   </tr>
 439
 440   <tr>
 441     <td valign="top"><a href="command-line-options.html#strip">-strip</a></td>
 442     <td valign="top">strip image of all profiles and comments</td>
 443   </tr>
 444
 445   <tr>
 446     <td valign="top"><a href="command-line-options.html#unique">-unique</a></td>
 447     <td valign="top">display image the number of unique colors in the image.</td>
 448   </tr>
 449
 450   <tr>
 451     <td valign="top"><a href="command-line-options.html#units">-units <em class="option">type</em></a></td>
 452     <td valign="top">the units of image resolution</td>
 453   </tr>
 454
 455   <tr>
 456     <td valign="top"><a href="command-line-options.html#verbose">-verbose</a></td>
 457     <td valign="top">print detailed information about the image</td>
 458   </tr>
 459
 460   <tr>
 461     <td valign="top"><a href="command-line-options.html#version">-version</a></td>
 462     <td valign="top">print version information</td>
 463   </tr>
 464
 465   <tr>
 466     <td valign="top"><a href="command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
 467     <td valign="top">access method for pixels outside the boundaries of the image</td>
 468   </tr>
 469
 470   </tbody>
 471 </table>
 472
 473 </div>
 474
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