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gerrit-public.fairphone.software / platform / external / ImageMagick / 64337ffa810a396d7988072f4e6b9edc0c705774 / . / www / identify.html
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212<div class="main">
213
214
215
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]216<h1>ImageMagick Identify Command-line Tool</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]217<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
218
219<div class="doc-section">
220<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>
221</div>
222
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]223<h2><a id="usage"></a>Example Usage</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]224<div class="doc-section">
225
226<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>
227
228<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>
229<p>Next, we look at the same image in greater detail:</p>
230
231<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg <br/>
232 Format: JPEG (Joint Photographic Experts Group JFIF format) <br/>
233 Class: DirectClass <br/>
234 Geometry: 70x46+0+0 <br/>
235 Resolution: 72x72 <br/>
236 Print size: 0.972222x0.638889 <br/>
237 Units: PixelsPerInch <br/>
238 Type: TrueColor <br/>
239 Endianess: Undefined <br/>
240 Colorspace: RGB <br/>
241 Depth: 8-bit <br/>
242 Channel depth: <br/>
243 red: 8-bit <br/>
244 green: 8-bit <br/>
245 blue: 8-bit <br/>
246 Channel statistics: <br/>
247 red: <br/>
248 min: 37 (0.145098) <br/>
249 max: 255 (1) <br/>
250 mean: 145.58 (0.5709) <br/>
251 standard deviation: 67.3195 (0.263998) <br/>
252 green: <br/>
253 min: 31 (0.121569) <br/>
254 max: 255 (1) <br/>
255 mean: 89.2512 (0.350005) <br/>
256 standard deviation: 52.0488 (0.204113) <br/>
257 blue: <br/>
258 min: 17 (0.0666667) <br/>
259 max: 255 (1) <br/>
260 mean: 80.4075 (0.315323) <br/>
261 standard deviation: 54.0052 (0.211785) <br/>
262 Rendering intent: Undefined <br/>
263 Interlace: None <br/>
264 Background color: white <br/>
265 Border color: rgb(223,223,223) <br/>
266 Matte color: grey74 <br/>
267 Transparent color: black <br/>
268 Page geometry: 70x46+0+0 <br/>
269 Dispose: Undefined <br/>
270 Iterations: 0 <br/>
271 Compression: JPEG <br/>
272 Quality: 100 <br/>
273 Orientation: Undefined <br/>
274 Properties: <br/>
275 date:create: 2008-01-08T11:08:52-05:00 <br/>
276 date:modify: 2005-04-07T12:48:13-04:00 <br/>
277 jpeg:colorspace: 2 <br/>
278 jpeg:sampling-factor: 2x2,1x1,1x1 <br/>
279 signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc <br/>
280 Artifacts: <br/>
281 verbose: true <br/>
282 Tainted: False <br/>
283 Filesize: 3.97266kb <br/>
284 Number pixels: 3.14453kb <br/>
cristy84134182011-06-15 22:59:00 +0000[diff] [blame]285 Version: ImageMagick 6.7.0-8 2011-06-03 Q16 http://www.imagemagick.org</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]286<p>To get the print size in inches of an image at 72 DPI, use:</p>
287
288<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>
289<p>The depth and dimensions of a raw image must be specified on the command line:</p>
290
291<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]292<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]293
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]294<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]295<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>
296
297</div>
298
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]299<h2><a id="options"></a>Option Summary</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]300<div class="doc-section">
301
302<p>The <kbd>identify</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
303
304<table class="doc">
305 <tbody>
306 <tr>
307 <th align="left">Option</th>
308 <th align="left">Description</th>
309 </tr>
310
311 <tr>
312 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
313 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
314transparent, extract, background, or shape the alpha channel</td>
315 </tr>
316
317 <tr>
318 <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
319 <td valign="top">remove pixel-aliasing</td>
320 </tr>
321
322 <tr>
323 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
324 <td valign="top">decrypt image with this password</td>
325 </tr>
326
327 <tr>
328 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
329 <td valign="top">apply option to select image channels</td>
330 </tr>
331
332 <tr>
333 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
334 <td valign="top">set image colorspace</td>
335 </tr>
336
337 <tr>
338 <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
339 <td valign="top">crop the image</td>
340 </tr>
341
342 <tr>
343 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
344 <td valign="top">display copious debugging information</td>
345 </tr>
346
347 <tr>
348 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
349 <td valign="top">define one or more image format options</td>
350 </tr>
351
352 <tr>
353 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
354 <td valign="top">horizontal and vertical density of the image</td>
355 </tr>
356
357 <tr>
358 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
359 <td valign="top">image depth</td>
360 </tr>
361
362 <tr>
363 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
364 <td valign="top">extract area from image</td>
365 </tr>
366
367 <tr>
cristy7396d882010-01-27 02:37:56 +0000[diff] [blame]368 <td valign="top"><a href="../www/command-line-options.html#features">-features <em class="option">distance</em></a></td>
369 <td valign="top">display image features (e.g. contract, correlations, etc.).</td>
370 </tr>
371
372 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]373 <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
374 <td valign="top">output formatted image characteristics</td>
375 </tr>
376
377 <tr>
378 <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
379 <td valign="top">level of gamma correction</td>
380 </tr>
381
382 <tr>
383 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
384 <td valign="top">print program options</td>
385 </tr>
386
387 <tr>
388 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
389 <td valign="top">type of image interlacing scheme</td>
390 </tr>
391
392 <tr>
393 <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
394 <td valign="top">pixel color interpolation method</td>
395 </tr>
396
397 <tr>
398 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
399 <td valign="top">pixel cache resource limit</td>
400 </tr>
401
402 <tr>
403 <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
404 <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
405 </tr>
406
407 <tr>
408 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
409 <td valign="top">format of debugging information</td>
410 </tr>
411
412 <tr>
413 <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
414 <td valign="top">monitor progress</td>
415 </tr>
416
417 <tr>
cristyb29bc032010-02-01 20:29:43 +0000[diff] [blame]418 <td valign="top"><a href="../www/command-line-options.html#negate">-negate</a></td>
419 <td valign="top">replace each pixel with its complementary color </td>
420 </tr>
421
422 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]423 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
424 <td valign="top">suppress all warning messages</td>
425 </tr>
426
427 <tr>
428 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
429 <td valign="top">pay attention to warning messages.</td>
430 </tr>
431
432 <tr>
433 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
434 <td valign="top">settings remain in effect until parenthesis boundary.</td>
435 </tr>
436
437 <tr>
438 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
439 <td valign="top">horizontal and vertical sampling factor</td>
440 </tr>
441
442 <tr>
443 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
444 <td valign="top">set an image attribute</td>
445 </tr>
446
447 <tr>
448 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
449 <td valign="top">width and height of image</td>
450 </tr>
451
452 <tr>
453 <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
454 <td valign="top">strip image of all profiles and comments</td>
455 </tr>
456
457 <tr>
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]458 <td valign="top"><a href="../www/command-line-options.html#unique">-unique</a></td>
459 <td valign="top">display image the number of unique colors in the image.</td>
460 </tr>
461
462 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]463 <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
464 <td valign="top">the units of image resolution</td>
465 </tr>
466
467 <tr>
468 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
469 <td valign="top">print detailed information about the image</td>
470 </tr>
471
472 <tr>
473 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
474 <td valign="top">print version information</td>
475 </tr>
476
477 <tr>
478 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
479 <td valign="top">access method for pixels outside the boundaries of the image</td>
480 </tr>
481
482 </tbody>
483</table>
484
485</div>
cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]486
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