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213<div class="main">
214
215
216
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]217<h1>ImageMagick Identify Command-line Tool</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]218<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
219
220<div class="doc-section">
221<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>
222</div>
223
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]224<h2><a id="usage"></a>Example Usage</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]225<div class="doc-section">
226
227<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>
228
229<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>
230<p>Next, we look at the same image in greater detail:</p>
231
232<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg <br/>
233 Format: JPEG (Joint Photographic Experts Group JFIF format) <br/>
234 Class: DirectClass <br/>
235 Geometry: 70x46+0+0 <br/>
236 Resolution: 72x72 <br/>
237 Print size: 0.972222x0.638889 <br/>
238 Units: PixelsPerInch <br/>
239 Type: TrueColor <br/>
240 Endianess: Undefined <br/>
241 Colorspace: RGB <br/>
242 Depth: 8-bit <br/>
243 Channel depth: <br/>
244 red: 8-bit <br/>
245 green: 8-bit <br/>
246 blue: 8-bit <br/>
247 Channel statistics: <br/>
248 red: <br/>
249 min: 37 (0.145098) <br/>
250 max: 255 (1) <br/>
251 mean: 145.58 (0.5709) <br/>
252 standard deviation: 67.3195 (0.263998) <br/>
253 green: <br/>
254 min: 31 (0.121569) <br/>
255 max: 255 (1) <br/>
256 mean: 89.2512 (0.350005) <br/>
257 standard deviation: 52.0488 (0.204113) <br/>
258 blue: <br/>
259 min: 17 (0.0666667) <br/>
260 max: 255 (1) <br/>
261 mean: 80.4075 (0.315323) <br/>
262 standard deviation: 54.0052 (0.211785) <br/>
263 Rendering intent: Undefined <br/>
264 Interlace: None <br/>
265 Background color: white <br/>
266 Border color: rgb(223,223,223) <br/>
267 Matte color: grey74 <br/>
268 Transparent color: black <br/>
269 Page geometry: 70x46+0+0 <br/>
270 Dispose: Undefined <br/>
271 Iterations: 0 <br/>
272 Compression: JPEG <br/>
273 Quality: 100 <br/>
274 Orientation: Undefined <br/>
275 Properties: <br/>
276 date:create: 2008-01-08T11:08:52-05:00 <br/>
277 date:modify: 2005-04-07T12:48:13-04:00 <br/>
278 jpeg:colorspace: 2 <br/>
279 jpeg:sampling-factor: 2x2,1x1,1x1 <br/>
280 signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc <br/>
281 Artifacts: <br/>
282 verbose: true <br/>
283 Tainted: False <br/>
284 Filesize: 3.97266kb <br/>
285 Number pixels: 3.14453kb <br/>
cristy1efc1ab2011-08-01 14:47:02 +0000[diff] [blame^]286 Version: ImageMagick 6.7.1-1 2011-07-01 Q16 http://www.imagemagick.org</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]287<p>To get the print size in inches of an image at 72 DPI, use:</p>
288
289<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>
290<p>The depth and dimensions of a raw image must be specified on the command line:</p>
291
292<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]293<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]294
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]295<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]296<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>
297
298</div>
299
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]300<h2><a id="options"></a>Option Summary</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]301<div class="doc-section">
302
303<p>The <kbd>identify</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
304
305<table class="doc">
306 <tbody>
307 <tr>
308 <th align="left">Option</th>
309 <th align="left">Description</th>
310 </tr>
311
312 <tr>
313 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
314 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
315transparent, extract, background, or shape the alpha channel</td>
316 </tr>
317
318 <tr>
319 <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
320 <td valign="top">remove pixel-aliasing</td>
321 </tr>
322
323 <tr>
324 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
325 <td valign="top">decrypt image with this password</td>
326 </tr>
327
328 <tr>
329 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
330 <td valign="top">apply option to select image channels</td>
331 </tr>
332
333 <tr>
334 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
335 <td valign="top">set image colorspace</td>
336 </tr>
337
338 <tr>
339 <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
340 <td valign="top">crop the image</td>
341 </tr>
342
343 <tr>
344 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
345 <td valign="top">display copious debugging information</td>
346 </tr>
347
348 <tr>
349 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
350 <td valign="top">define one or more image format options</td>
351 </tr>
352
353 <tr>
354 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
355 <td valign="top">horizontal and vertical density of the image</td>
356 </tr>
357
358 <tr>
359 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
360 <td valign="top">image depth</td>
361 </tr>
362
363 <tr>
364 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
365 <td valign="top">extract area from image</td>
366 </tr>
367
368 <tr>
cristy7396d882010-01-27 02:37:56 +0000[diff] [blame]369 <td valign="top"><a href="../www/command-line-options.html#features">-features <em class="option">distance</em></a></td>
370 <td valign="top">display image features (e.g. contract, correlations, etc.).</td>
371 </tr>
372
373 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]374 <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
375 <td valign="top">output formatted image characteristics</td>
376 </tr>
377
378 <tr>
379 <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
380 <td valign="top">level of gamma correction</td>
381 </tr>
382
383 <tr>
384 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
385 <td valign="top">print program options</td>
386 </tr>
387
388 <tr>
389 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
390 <td valign="top">type of image interlacing scheme</td>
391 </tr>
392
393 <tr>
394 <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
395 <td valign="top">pixel color interpolation method</td>
396 </tr>
397
398 <tr>
399 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
400 <td valign="top">pixel cache resource limit</td>
401 </tr>
402
403 <tr>
404 <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
405 <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
406 </tr>
407
408 <tr>
409 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
410 <td valign="top">format of debugging information</td>
411 </tr>
412
413 <tr>
414 <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
415 <td valign="top">monitor progress</td>
416 </tr>
417
418 <tr>
cristyb29bc032010-02-01 20:29:43 +0000[diff] [blame]419 <td valign="top"><a href="../www/command-line-options.html#negate">-negate</a></td>
420 <td valign="top">replace each pixel with its complementary color </td>
421 </tr>
422
423 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]424 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
425 <td valign="top">suppress all warning messages</td>
426 </tr>
427
428 <tr>
429 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
430 <td valign="top">pay attention to warning messages.</td>
431 </tr>
432
433 <tr>
434 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
435 <td valign="top">settings remain in effect until parenthesis boundary.</td>
436 </tr>
437
438 <tr>
439 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
440 <td valign="top">horizontal and vertical sampling factor</td>
441 </tr>
442
443 <tr>
444 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
445 <td valign="top">set an image attribute</td>
446 </tr>
447
448 <tr>
449 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
450 <td valign="top">width and height of image</td>
451 </tr>
452
453 <tr>
454 <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
455 <td valign="top">strip image of all profiles and comments</td>
456 </tr>
457
458 <tr>
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]459 <td valign="top"><a href="../www/command-line-options.html#unique">-unique</a></td>
460 <td valign="top">display image the number of unique colors in the image.</td>
461 </tr>
462
463 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]464 <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
465 <td valign="top">the units of image resolution</td>
466 </tr>
467
468 <tr>
469 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
470 <td valign="top">print detailed information about the image</td>
471 </tr>
472
473 <tr>
474 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
475 <td valign="top">print version information</td>
476 </tr>
477
478 <tr>
479 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
480 <td valign="top">access method for pixels outside the boundaries of the image</td>
481 </tr>
482
483 </tbody>
484</table>
485
486</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]487
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489
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