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206<div class="main">
207
208
209
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]210<h1>ImageMagick Identify Command-line Tool</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]211<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
212
213<div class="doc-section">
214<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>
215</div>
216
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]217<h2><a id="usage"></a>Example Usage</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]218<div class="doc-section">
219
220<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>
221
222<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>
223<p>Next, we look at the same image in greater detail:</p>
224
225<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg <br/>
226 Format: JPEG (Joint Photographic Experts Group JFIF format) <br/>
227 Class: DirectClass <br/>
228 Geometry: 70x46+0+0 <br/>
229 Resolution: 72x72 <br/>
230 Print size: 0.972222x0.638889 <br/>
231 Units: PixelsPerInch <br/>
232 Type: TrueColor <br/>
233 Endianess: Undefined <br/>
234 Colorspace: RGB <br/>
235 Depth: 8-bit <br/>
236 Channel depth: <br/>
237 red: 8-bit <br/>
238 green: 8-bit <br/>
239 blue: 8-bit <br/>
240 Channel statistics: <br/>
241 red: <br/>
242 min: 37 (0.145098) <br/>
243 max: 255 (1) <br/>
244 mean: 145.58 (0.5709) <br/>
245 standard deviation: 67.3195 (0.263998) <br/>
246 green: <br/>
247 min: 31 (0.121569) <br/>
248 max: 255 (1) <br/>
249 mean: 89.2512 (0.350005) <br/>
250 standard deviation: 52.0488 (0.204113) <br/>
251 blue: <br/>
252 min: 17 (0.0666667) <br/>
253 max: 255 (1) <br/>
254 mean: 80.4075 (0.315323) <br/>
255 standard deviation: 54.0052 (0.211785) <br/>
256 Rendering intent: Undefined <br/>
257 Interlace: None <br/>
258 Background color: white <br/>
259 Border color: rgb(223,223,223) <br/>
260 Matte color: grey74 <br/>
261 Transparent color: black <br/>
262 Page geometry: 70x46+0+0 <br/>
263 Dispose: Undefined <br/>
264 Iterations: 0 <br/>
265 Compression: JPEG <br/>
266 Quality: 100 <br/>
267 Orientation: Undefined <br/>
268 Properties: <br/>
269 date:create: 2008-01-08T11:08:52-05:00 <br/>
270 date:modify: 2005-04-07T12:48:13-04:00 <br/>
271 jpeg:colorspace: 2 <br/>
272 jpeg:sampling-factor: 2x2,1x1,1x1 <br/>
273 signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc <br/>
274 Artifacts: <br/>
275 verbose: true <br/>
276 Tainted: False <br/>
277 Filesize: 3.97266kb <br/>
278 Number pixels: 3.14453kb <br/>
cristye6e84152011-06-06 14:16:49 +0000[diff] [blame^]279 Version: ImageMagick 6.7.0-4 2011-06-03 Q16 http://www.imagemagick.org</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]280<p>To get the print size in inches of an image at 72 DPI, use:</p>
281
282<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>
283<p>The depth and dimensions of a raw image must be specified on the command line:</p>
284
285<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]286<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]287
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]288<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]289<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>
290
291</div>
292
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]293<h2><a id="options"></a>Option Summary</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]294<div class="doc-section">
295
296<p>The <kbd>identify</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
297
298<table class="doc">
299 <tbody>
300 <tr>
301 <th align="left">Option</th>
302 <th align="left">Description</th>
303 </tr>
304
305 <tr>
306 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
307 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
308transparent, extract, background, or shape the alpha channel</td>
309 </tr>
310
311 <tr>
312 <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
313 <td valign="top">remove pixel-aliasing</td>
314 </tr>
315
316 <tr>
317 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
318 <td valign="top">decrypt image with this password</td>
319 </tr>
320
321 <tr>
322 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
323 <td valign="top">apply option to select image channels</td>
324 </tr>
325
326 <tr>
327 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
328 <td valign="top">set image colorspace</td>
329 </tr>
330
331 <tr>
332 <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
333 <td valign="top">crop the image</td>
334 </tr>
335
336 <tr>
337 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
338 <td valign="top">display copious debugging information</td>
339 </tr>
340
341 <tr>
342 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
343 <td valign="top">define one or more image format options</td>
344 </tr>
345
346 <tr>
347 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
348 <td valign="top">horizontal and vertical density of the image</td>
349 </tr>
350
351 <tr>
352 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
353 <td valign="top">image depth</td>
354 </tr>
355
356 <tr>
357 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
358 <td valign="top">extract area from image</td>
359 </tr>
360
361 <tr>
cristy7396d882010-01-27 02:37:56 +0000[diff] [blame]362 <td valign="top"><a href="../www/command-line-options.html#features">-features <em class="option">distance</em></a></td>
363 <td valign="top">display image features (e.g. contract, correlations, etc.).</td>
364 </tr>
365
366 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]367 <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
368 <td valign="top">output formatted image characteristics</td>
369 </tr>
370
371 <tr>
372 <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
373 <td valign="top">level of gamma correction</td>
374 </tr>
375
376 <tr>
377 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
378 <td valign="top">print program options</td>
379 </tr>
380
381 <tr>
382 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
383 <td valign="top">type of image interlacing scheme</td>
384 </tr>
385
386 <tr>
387 <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
388 <td valign="top">pixel color interpolation method</td>
389 </tr>
390
391 <tr>
392 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
393 <td valign="top">pixel cache resource limit</td>
394 </tr>
395
396 <tr>
397 <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
398 <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
399 </tr>
400
401 <tr>
402 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
403 <td valign="top">format of debugging information</td>
404 </tr>
405
406 <tr>
407 <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
408 <td valign="top">monitor progress</td>
409 </tr>
410
411 <tr>
cristyb29bc032010-02-01 20:29:43 +0000[diff] [blame]412 <td valign="top"><a href="../www/command-line-options.html#negate">-negate</a></td>
413 <td valign="top">replace each pixel with its complementary color </td>
414 </tr>
415
416 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]417 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
418 <td valign="top">suppress all warning messages</td>
419 </tr>
420
421 <tr>
422 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
423 <td valign="top">pay attention to warning messages.</td>
424 </tr>
425
426 <tr>
427 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
428 <td valign="top">settings remain in effect until parenthesis boundary.</td>
429 </tr>
430
431 <tr>
432 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
433 <td valign="top">horizontal and vertical sampling factor</td>
434 </tr>
435
436 <tr>
437 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
438 <td valign="top">set an image attribute</td>
439 </tr>
440
441 <tr>
442 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
443 <td valign="top">width and height of image</td>
444 </tr>
445
446 <tr>
447 <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
448 <td valign="top">strip image of all profiles and comments</td>
449 </tr>
450
451 <tr>
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]452 <td valign="top"><a href="../www/command-line-options.html#unique">-unique</a></td>
453 <td valign="top">display image the number of unique colors in the image.</td>
454 </tr>
455
456 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]457 <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
458 <td valign="top">the units of image resolution</td>
459 </tr>
460
461 <tr>
462 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
463 <td valign="top">print detailed information about the image</td>
464 </tr>
465
466 <tr>
467 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
468 <td valign="top">print version information</td>
469 </tr>
470
471 <tr>
472 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
473 <td valign="top">access method for pixels outside the boundaries of the image</td>
474 </tr>
475
476 </tbody>
477</table>
478
479</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]480
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