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191<div class="main">
192
193
194
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]195<h1>ImageMagick Identify Command-line Tool</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]196<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
197
198<div class="doc-section">
199<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>
200</div>
201
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]202<h2><a id="usage"></a>Example Usage</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]203<div class="doc-section">
204
205<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>
206
207<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>
208<p>Next, we look at the same image in greater detail:</p>
209
210<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg <br/>
211 Format: JPEG (Joint Photographic Experts Group JFIF format) <br/>
212 Class: DirectClass <br/>
213 Geometry: 70x46+0+0 <br/>
214 Resolution: 72x72 <br/>
215 Print size: 0.972222x0.638889 <br/>
216 Units: PixelsPerInch <br/>
217 Type: TrueColor <br/>
218 Endianess: Undefined <br/>
219 Colorspace: RGB <br/>
220 Depth: 8-bit <br/>
221 Channel depth: <br/>
222 red: 8-bit <br/>
223 green: 8-bit <br/>
224 blue: 8-bit <br/>
225 Channel statistics: <br/>
226 red: <br/>
227 min: 37 (0.145098) <br/>
228 max: 255 (1) <br/>
229 mean: 145.58 (0.5709) <br/>
230 standard deviation: 67.3195 (0.263998) <br/>
231 green: <br/>
232 min: 31 (0.121569) <br/>
233 max: 255 (1) <br/>
234 mean: 89.2512 (0.350005) <br/>
235 standard deviation: 52.0488 (0.204113) <br/>
236 blue: <br/>
237 min: 17 (0.0666667) <br/>
238 max: 255 (1) <br/>
239 mean: 80.4075 (0.315323) <br/>
240 standard deviation: 54.0052 (0.211785) <br/>
241 Rendering intent: Undefined <br/>
242 Interlace: None <br/>
243 Background color: white <br/>
244 Border color: rgb(223,223,223) <br/>
245 Matte color: grey74 <br/>
246 Transparent color: black <br/>
247 Page geometry: 70x46+0+0 <br/>
248 Dispose: Undefined <br/>
249 Iterations: 0 <br/>
250 Compression: JPEG <br/>
251 Quality: 100 <br/>
252 Orientation: Undefined <br/>
253 Properties: <br/>
254 date:create: 2008-01-08T11:08:52-05:00 <br/>
255 date:modify: 2005-04-07T12:48:13-04:00 <br/>
256 jpeg:colorspace: 2 <br/>
257 jpeg:sampling-factor: 2x2,1x1,1x1 <br/>
258 signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc <br/>
259 Artifacts: <br/>
260 verbose: true <br/>
261 Tainted: False <br/>
262 Filesize: 3.97266kb <br/>
263 Number pixels: 3.14453kb <br/>
cristy2d67ddd2011-02-13 15:38:23 +0000[diff] [blame]264 Version: ImageMagick 6.6.7-7 2010-71-71 Q16 http://www.imagemagick.org</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]265<p>To get the print size in inches of an image at 72 DPI, use:</p>
266
267<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>
268<p>The depth and dimensions of a raw image must be specified on the command line:</p>
269
270<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]271<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]272
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]273<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]274<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>
275
276</div>
277
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]278<h2><a id="options"></a>Option Summary</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]279<div class="doc-section">
280
281<p>The <kbd>identify</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
282
283<table class="doc">
284 <tbody>
285 <tr>
286 <th align="left">Option</th>
287 <th align="left">Description</th>
288 </tr>
289
290 <tr>
291 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
292 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
293transparent, extract, background, or shape the alpha channel</td>
294 </tr>
295
296 <tr>
297 <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
298 <td valign="top">remove pixel-aliasing</td>
299 </tr>
300
301 <tr>
302 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
303 <td valign="top">decrypt image with this password</td>
304 </tr>
305
306 <tr>
307 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
308 <td valign="top">apply option to select image channels</td>
309 </tr>
310
311 <tr>
312 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
313 <td valign="top">set image colorspace</td>
314 </tr>
315
316 <tr>
317 <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
318 <td valign="top">crop the image</td>
319 </tr>
320
321 <tr>
322 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
323 <td valign="top">display copious debugging information</td>
324 </tr>
325
326 <tr>
327 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
328 <td valign="top">define one or more image format options</td>
329 </tr>
330
331 <tr>
332 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
333 <td valign="top">horizontal and vertical density of the image</td>
334 </tr>
335
336 <tr>
337 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
338 <td valign="top">image depth</td>
339 </tr>
340
341 <tr>
342 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
343 <td valign="top">extract area from image</td>
344 </tr>
345
346 <tr>
cristy7396d882010-01-27 02:37:56 +0000[diff] [blame]347 <td valign="top"><a href="../www/command-line-options.html#features">-features <em class="option">distance</em></a></td>
348 <td valign="top">display image features (e.g. contract, correlations, etc.).</td>
349 </tr>
350
351 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]352 <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
353 <td valign="top">output formatted image characteristics</td>
354 </tr>
355
356 <tr>
357 <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
358 <td valign="top">level of gamma correction</td>
359 </tr>
360
361 <tr>
362 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
363 <td valign="top">print program options</td>
364 </tr>
365
366 <tr>
367 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
368 <td valign="top">type of image interlacing scheme</td>
369 </tr>
370
371 <tr>
372 <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
373 <td valign="top">pixel color interpolation method</td>
374 </tr>
375
376 <tr>
377 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
378 <td valign="top">pixel cache resource limit</td>
379 </tr>
380
381 <tr>
382 <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
383 <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
384 </tr>
385
386 <tr>
387 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
388 <td valign="top">format of debugging information</td>
389 </tr>
390
391 <tr>
392 <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
393 <td valign="top">monitor progress</td>
394 </tr>
395
396 <tr>
cristyb29bc032010-02-01 20:29:43 +0000[diff] [blame]397 <td valign="top"><a href="../www/command-line-options.html#negate">-negate</a></td>
398 <td valign="top">replace each pixel with its complementary color </td>
399 </tr>
400
401 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]402 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
403 <td valign="top">suppress all warning messages</td>
404 </tr>
405
406 <tr>
407 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
408 <td valign="top">pay attention to warning messages.</td>
409 </tr>
410
411 <tr>
412 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
413 <td valign="top">settings remain in effect until parenthesis boundary.</td>
414 </tr>
415
416 <tr>
417 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
418 <td valign="top">horizontal and vertical sampling factor</td>
419 </tr>
420
421 <tr>
422 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
423 <td valign="top">set an image attribute</td>
424 </tr>
425
426 <tr>
427 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
428 <td valign="top">width and height of image</td>
429 </tr>
430
431 <tr>
432 <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
433 <td valign="top">strip image of all profiles and comments</td>
434 </tr>
435
436 <tr>
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]437 <td valign="top"><a href="../www/command-line-options.html#unique">-unique</a></td>
438 <td valign="top">display image the number of unique colors in the image.</td>
439 </tr>
440
441 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]442 <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
443 <td valign="top">the units of image resolution</td>
444 </tr>
445
446 <tr>
447 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
448 <td valign="top">print detailed information about the image</td>
449 </tr>
450
451 <tr>
452 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
453 <td valign="top">print version information</td>
454 </tr>
455
456 <tr>
457 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
458 <td valign="top">access method for pixels outside the boundaries of the image</td>
459 </tr>
460
461 </tbody>
462</table>
463
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