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195
196
197
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]198<h1>ImageMagick Identify Command-line Tool</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]199<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
200
201<div class="doc-section">
202<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>
203</div>
204
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]205<h2><a id="usage"></a>Example Usage</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]206<div class="doc-section">
207
208<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>
209
210<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>
211<p>Next, we look at the same image in greater detail:</p>
212
213<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg <br/>
214 Format: JPEG (Joint Photographic Experts Group JFIF format) <br/>
215 Class: DirectClass <br/>
216 Geometry: 70x46+0+0 <br/>
217 Resolution: 72x72 <br/>
218 Print size: 0.972222x0.638889 <br/>
219 Units: PixelsPerInch <br/>
220 Type: TrueColor <br/>
221 Endianess: Undefined <br/>
222 Colorspace: RGB <br/>
223 Depth: 8-bit <br/>
224 Channel depth: <br/>
225 red: 8-bit <br/>
226 green: 8-bit <br/>
227 blue: 8-bit <br/>
228 Channel statistics: <br/>
229 red: <br/>
230 min: 37 (0.145098) <br/>
231 max: 255 (1) <br/>
232 mean: 145.58 (0.5709) <br/>
233 standard deviation: 67.3195 (0.263998) <br/>
234 green: <br/>
235 min: 31 (0.121569) <br/>
236 max: 255 (1) <br/>
237 mean: 89.2512 (0.350005) <br/>
238 standard deviation: 52.0488 (0.204113) <br/>
239 blue: <br/>
240 min: 17 (0.0666667) <br/>
241 max: 255 (1) <br/>
242 mean: 80.4075 (0.315323) <br/>
243 standard deviation: 54.0052 (0.211785) <br/>
244 Rendering intent: Undefined <br/>
245 Interlace: None <br/>
246 Background color: white <br/>
247 Border color: rgb(223,223,223) <br/>
248 Matte color: grey74 <br/>
249 Transparent color: black <br/>
250 Page geometry: 70x46+0+0 <br/>
251 Dispose: Undefined <br/>
252 Iterations: 0 <br/>
253 Compression: JPEG <br/>
254 Quality: 100 <br/>
255 Orientation: Undefined <br/>
256 Properties: <br/>
257 date:create: 2008-01-08T11:08:52-05:00 <br/>
258 date:modify: 2005-04-07T12:48:13-04:00 <br/>
259 jpeg:colorspace: 2 <br/>
260 jpeg:sampling-factor: 2x2,1x1,1x1 <br/>
261 signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc <br/>
262 Artifacts: <br/>
263 verbose: true <br/>
264 Tainted: False <br/>
265 Filesize: 3.97266kb <br/>
266 Number pixels: 3.14453kb <br/>
cristyd7ee1a72011-02-22 12:47:53 +0000[diff] [blame^]267 Version: ImageMagick 6.6.7-9 2011-02-22 Q16 http://www.imagemagick.org</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]268<p>To get the print size in inches of an image at 72 DPI, use:</p>
269
270<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>
271<p>The depth and dimensions of a raw image must be specified on the command line:</p>
272
273<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]274<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]275
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]276<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]277<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>
278
279</div>
280
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]281<h2><a id="options"></a>Option Summary</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]282<div class="doc-section">
283
284<p>The <kbd>identify</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
285
286<table class="doc">
287 <tbody>
288 <tr>
289 <th align="left">Option</th>
290 <th align="left">Description</th>
291 </tr>
292
293 <tr>
294 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
295 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
296transparent, extract, background, or shape the alpha channel</td>
297 </tr>
298
299 <tr>
300 <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
301 <td valign="top">remove pixel-aliasing</td>
302 </tr>
303
304 <tr>
305 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
306 <td valign="top">decrypt image with this password</td>
307 </tr>
308
309 <tr>
310 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
311 <td valign="top">apply option to select image channels</td>
312 </tr>
313
314 <tr>
315 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
316 <td valign="top">set image colorspace</td>
317 </tr>
318
319 <tr>
320 <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
321 <td valign="top">crop the image</td>
322 </tr>
323
324 <tr>
325 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
326 <td valign="top">display copious debugging information</td>
327 </tr>
328
329 <tr>
330 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
331 <td valign="top">define one or more image format options</td>
332 </tr>
333
334 <tr>
335 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
336 <td valign="top">horizontal and vertical density of the image</td>
337 </tr>
338
339 <tr>
340 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
341 <td valign="top">image depth</td>
342 </tr>
343
344 <tr>
345 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
346 <td valign="top">extract area from image</td>
347 </tr>
348
349 <tr>
cristy7396d882010-01-27 02:37:56 +0000[diff] [blame]350 <td valign="top"><a href="../www/command-line-options.html#features">-features <em class="option">distance</em></a></td>
351 <td valign="top">display image features (e.g. contract, correlations, etc.).</td>
352 </tr>
353
354 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]355 <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
356 <td valign="top">output formatted image characteristics</td>
357 </tr>
358
359 <tr>
360 <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
361 <td valign="top">level of gamma correction</td>
362 </tr>
363
364 <tr>
365 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
366 <td valign="top">print program options</td>
367 </tr>
368
369 <tr>
370 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
371 <td valign="top">type of image interlacing scheme</td>
372 </tr>
373
374 <tr>
375 <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
376 <td valign="top">pixel color interpolation method</td>
377 </tr>
378
379 <tr>
380 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
381 <td valign="top">pixel cache resource limit</td>
382 </tr>
383
384 <tr>
385 <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
386 <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
387 </tr>
388
389 <tr>
390 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
391 <td valign="top">format of debugging information</td>
392 </tr>
393
394 <tr>
395 <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
396 <td valign="top">monitor progress</td>
397 </tr>
398
399 <tr>
cristyb29bc032010-02-01 20:29:43 +0000[diff] [blame]400 <td valign="top"><a href="../www/command-line-options.html#negate">-negate</a></td>
401 <td valign="top">replace each pixel with its complementary color </td>
402 </tr>
403
404 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]405 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
406 <td valign="top">suppress all warning messages</td>
407 </tr>
408
409 <tr>
410 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
411 <td valign="top">pay attention to warning messages.</td>
412 </tr>
413
414 <tr>
415 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
416 <td valign="top">settings remain in effect until parenthesis boundary.</td>
417 </tr>
418
419 <tr>
420 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
421 <td valign="top">horizontal and vertical sampling factor</td>
422 </tr>
423
424 <tr>
425 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
426 <td valign="top">set an image attribute</td>
427 </tr>
428
429 <tr>
430 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
431 <td valign="top">width and height of image</td>
432 </tr>
433
434 <tr>
435 <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
436 <td valign="top">strip image of all profiles and comments</td>
437 </tr>
438
439 <tr>
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]440 <td valign="top"><a href="../www/command-line-options.html#unique">-unique</a></td>
441 <td valign="top">display image the number of unique colors in the image.</td>
442 </tr>
443
444 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]445 <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
446 <td valign="top">the units of image resolution</td>
447 </tr>
448
449 <tr>
450 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
451 <td valign="top">print detailed information about the image</td>
452 </tr>
453
454 <tr>
455 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
456 <td valign="top">print version information</td>
457 </tr>
458
459 <tr>
460 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
461 <td valign="top">access method for pixels outside the boundaries of the image</td>
462 </tr>
463
464 </tbody>
465</table>
466
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