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197<div class="main">
198
199
200
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]201<h1>ImageMagick Identify Command-line Tool</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]202<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
203
204<div class="doc-section">
205<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>
206</div>
207
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]208<h2><a id="usage"></a>Example Usage</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]209<div class="doc-section">
210
211<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>
212
213<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>
214<p>Next, we look at the same image in greater detail:</p>
215
216<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg <br/>
217 Format: JPEG (Joint Photographic Experts Group JFIF format) <br/>
218 Class: DirectClass <br/>
219 Geometry: 70x46+0+0 <br/>
220 Resolution: 72x72 <br/>
221 Print size: 0.972222x0.638889 <br/>
222 Units: PixelsPerInch <br/>
223 Type: TrueColor <br/>
224 Endianess: Undefined <br/>
225 Colorspace: RGB <br/>
226 Depth: 8-bit <br/>
227 Channel depth: <br/>
228 red: 8-bit <br/>
229 green: 8-bit <br/>
230 blue: 8-bit <br/>
231 Channel statistics: <br/>
232 red: <br/>
233 min: 37 (0.145098) <br/>
234 max: 255 (1) <br/>
235 mean: 145.58 (0.5709) <br/>
236 standard deviation: 67.3195 (0.263998) <br/>
237 green: <br/>
238 min: 31 (0.121569) <br/>
239 max: 255 (1) <br/>
240 mean: 89.2512 (0.350005) <br/>
241 standard deviation: 52.0488 (0.204113) <br/>
242 blue: <br/>
243 min: 17 (0.0666667) <br/>
244 max: 255 (1) <br/>
245 mean: 80.4075 (0.315323) <br/>
246 standard deviation: 54.0052 (0.211785) <br/>
247 Rendering intent: Undefined <br/>
248 Interlace: None <br/>
249 Background color: white <br/>
250 Border color: rgb(223,223,223) <br/>
251 Matte color: grey74 <br/>
252 Transparent color: black <br/>
253 Page geometry: 70x46+0+0 <br/>
254 Dispose: Undefined <br/>
255 Iterations: 0 <br/>
256 Compression: JPEG <br/>
257 Quality: 100 <br/>
258 Orientation: Undefined <br/>
259 Properties: <br/>
260 date:create: 2008-01-08T11:08:52-05:00 <br/>
261 date:modify: 2005-04-07T12:48:13-04:00 <br/>
262 jpeg:colorspace: 2 <br/>
263 jpeg:sampling-factor: 2x2,1x1,1x1 <br/>
264 signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc <br/>
265 Artifacts: <br/>
266 verbose: true <br/>
267 Tainted: False <br/>
268 Filesize: 3.97266kb <br/>
269 Number pixels: 3.14453kb <br/>
cristyd7ee1a72011-02-22 12:47:53 +0000[diff] [blame]270 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]271<p>To get the print size in inches of an image at 72 DPI, use:</p>
272
273<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>
274<p>The depth and dimensions of a raw image must be specified on the command line:</p>
275
276<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]277<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]278
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]279<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]280<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>
281
282</div>
283
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]284<h2><a id="options"></a>Option Summary</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]285<div class="doc-section">
286
287<p>The <kbd>identify</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
288
289<table class="doc">
290 <tbody>
291 <tr>
292 <th align="left">Option</th>
293 <th align="left">Description</th>
294 </tr>
295
296 <tr>
297 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
298 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
299transparent, extract, background, or shape the alpha channel</td>
300 </tr>
301
302 <tr>
303 <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
304 <td valign="top">remove pixel-aliasing</td>
305 </tr>
306
307 <tr>
308 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
309 <td valign="top">decrypt image with this password</td>
310 </tr>
311
312 <tr>
313 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
314 <td valign="top">apply option to select image channels</td>
315 </tr>
316
317 <tr>
318 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
319 <td valign="top">set image colorspace</td>
320 </tr>
321
322 <tr>
323 <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
324 <td valign="top">crop the image</td>
325 </tr>
326
327 <tr>
328 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
329 <td valign="top">display copious debugging information</td>
330 </tr>
331
332 <tr>
333 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
334 <td valign="top">define one or more image format options</td>
335 </tr>
336
337 <tr>
338 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
339 <td valign="top">horizontal and vertical density of the image</td>
340 </tr>
341
342 <tr>
343 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
344 <td valign="top">image depth</td>
345 </tr>
346
347 <tr>
348 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
349 <td valign="top">extract area from image</td>
350 </tr>
351
352 <tr>
cristy7396d882010-01-27 02:37:56 +0000[diff] [blame]353 <td valign="top"><a href="../www/command-line-options.html#features">-features <em class="option">distance</em></a></td>
354 <td valign="top">display image features (e.g. contract, correlations, etc.).</td>
355 </tr>
356
357 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]358 <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
359 <td valign="top">output formatted image characteristics</td>
360 </tr>
361
362 <tr>
363 <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
364 <td valign="top">level of gamma correction</td>
365 </tr>
366
367 <tr>
368 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
369 <td valign="top">print program options</td>
370 </tr>
371
372 <tr>
373 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
374 <td valign="top">type of image interlacing scheme</td>
375 </tr>
376
377 <tr>
378 <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
379 <td valign="top">pixel color interpolation method</td>
380 </tr>
381
382 <tr>
383 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
384 <td valign="top">pixel cache resource limit</td>
385 </tr>
386
387 <tr>
388 <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
389 <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
390 </tr>
391
392 <tr>
393 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
394 <td valign="top">format of debugging information</td>
395 </tr>
396
397 <tr>
398 <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
399 <td valign="top">monitor progress</td>
400 </tr>
401
402 <tr>
cristyb29bc032010-02-01 20:29:43 +0000[diff] [blame]403 <td valign="top"><a href="../www/command-line-options.html#negate">-negate</a></td>
404 <td valign="top">replace each pixel with its complementary color </td>
405 </tr>
406
407 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]408 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
409 <td valign="top">suppress all warning messages</td>
410 </tr>
411
412 <tr>
413 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
414 <td valign="top">pay attention to warning messages.</td>
415 </tr>
416
417 <tr>
418 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
419 <td valign="top">settings remain in effect until parenthesis boundary.</td>
420 </tr>
421
422 <tr>
423 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
424 <td valign="top">horizontal and vertical sampling factor</td>
425 </tr>
426
427 <tr>
428 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
429 <td valign="top">set an image attribute</td>
430 </tr>
431
432 <tr>
433 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
434 <td valign="top">width and height of image</td>
435 </tr>
436
437 <tr>
438 <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
439 <td valign="top">strip image of all profiles and comments</td>
440 </tr>
441
442 <tr>
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]443 <td valign="top"><a href="../www/command-line-options.html#unique">-unique</a></td>
444 <td valign="top">display image the number of unique colors in the image.</td>
445 </tr>
446
447 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]448 <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
449 <td valign="top">the units of image resolution</td>
450 </tr>
451
452 <tr>
453 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
454 <td valign="top">print detailed information about the image</td>
455 </tr>
456
457 <tr>
458 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
459 <td valign="top">print version information</td>
460 </tr>
461
462 <tr>
463 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
464 <td valign="top">access method for pixels outside the boundaries of the image</td>
465 </tr>
466
467 </tbody>
468</table>
469
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