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217
218
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]219<h1>ImageMagick Identify Command-line Tool</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]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
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]226<h2><a id="usage"></a>Example Usage</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]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/>
cristy29c5c992011-06-25 13:58:49 +0000[diff] [blame^]288 Version: ImageMagick 6.7.0-9 2011-06-03 Q16 http://www.imagemagick.org</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]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>
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]295<p>Here we display the image texture features and the number of unique colors in the image:</p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]296
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]297<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose -features 1 -unique image.png</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]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
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]302<h2><a id="options"></a>Option Summary</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]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",
317transparent, 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>
cristy7396d882010-01-27 02:37:56 +0000[diff] [blame]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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]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>
cristyb29bc032010-02-01 20:29:43 +0000[diff] [blame]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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]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>
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]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>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]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
488</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]489
490</div>
491
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