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168<div class="main">
169
170
171
cristyffb69ed2010-12-25 00:06:48 +0000[diff] [blame]172<h1>ImageMagick Identify Command-line Utility</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]173<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
174
175<div class="doc-section">
176<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>
177</div>
178
179<h2><a name="usage"></a>Example Usage</h2>
180<div class="doc-section">
181
182<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>
183
184<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>
185<p>Next, we look at the same image in greater detail:</p>
186
187<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg <br/>
188 Format: JPEG (Joint Photographic Experts Group JFIF format) <br/>
189 Class: DirectClass <br/>
190 Geometry: 70x46+0+0 <br/>
191 Resolution: 72x72 <br/>
192 Print size: 0.972222x0.638889 <br/>
193 Units: PixelsPerInch <br/>
194 Type: TrueColor <br/>
195 Endianess: Undefined <br/>
196 Colorspace: RGB <br/>
197 Depth: 8-bit <br/>
198 Channel depth: <br/>
199 red: 8-bit <br/>
200 green: 8-bit <br/>
201 blue: 8-bit <br/>
202 Channel statistics: <br/>
203 red: <br/>
204 min: 37 (0.145098) <br/>
205 max: 255 (1) <br/>
206 mean: 145.58 (0.5709) <br/>
207 standard deviation: 67.3195 (0.263998) <br/>
208 green: <br/>
209 min: 31 (0.121569) <br/>
210 max: 255 (1) <br/>
211 mean: 89.2512 (0.350005) <br/>
212 standard deviation: 52.0488 (0.204113) <br/>
213 blue: <br/>
214 min: 17 (0.0666667) <br/>
215 max: 255 (1) <br/>
216 mean: 80.4075 (0.315323) <br/>
217 standard deviation: 54.0052 (0.211785) <br/>
218 Rendering intent: Undefined <br/>
219 Interlace: None <br/>
220 Background color: white <br/>
221 Border color: rgb(223,223,223) <br/>
222 Matte color: grey74 <br/>
223 Transparent color: black <br/>
224 Page geometry: 70x46+0+0 <br/>
225 Dispose: Undefined <br/>
226 Iterations: 0 <br/>
227 Compression: JPEG <br/>
228 Quality: 100 <br/>
229 Orientation: Undefined <br/>
230 Properties: <br/>
231 date:create: 2008-01-08T11:08:52-05:00 <br/>
232 date:modify: 2005-04-07T12:48:13-04:00 <br/>
233 jpeg:colorspace: 2 <br/>
234 jpeg:sampling-factor: 2x2,1x1,1x1 <br/>
235 signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc <br/>
236 Artifacts: <br/>
237 verbose: true <br/>
238 Tainted: False <br/>
239 Filesize: 3.97266kb <br/>
240 Number pixels: 3.14453kb <br/>
cristy307ba182010-12-25 01:00:34 +0000[diff] [blame^]241 Version: ImageMagick 6.6.6-7 2010-12-25 Q16 http://www.imagemagick.org</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]242<p>To get the print size in inches of an image at 72 DPI, use:</p>
243
244<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>
245<p>The depth and dimensions of a raw image must be specified on the command line:</p>
246
247<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]248<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]249
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]250<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]251<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>
252
253</div>
254
255<h2><a name="options"></a>Option Summary</h2>
256<div class="doc-section">
257
258<p>The <kbd>identify</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
259
260<table class="doc">
261 <tbody>
262 <tr>
263 <th align="left">Option</th>
264 <th align="left">Description</th>
265 </tr>
266
267 <tr>
268 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
269 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
270transparent, extract, background, or shape the alpha channel</td>
271 </tr>
272
273 <tr>
274 <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
275 <td valign="top">remove pixel-aliasing</td>
276 </tr>
277
278 <tr>
279 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
280 <td valign="top">decrypt image with this password</td>
281 </tr>
282
283 <tr>
284 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
285 <td valign="top">apply option to select image channels</td>
286 </tr>
287
288 <tr>
289 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
290 <td valign="top">set image colorspace</td>
291 </tr>
292
293 <tr>
294 <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
295 <td valign="top">crop the image</td>
296 </tr>
297
298 <tr>
299 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
300 <td valign="top">display copious debugging information</td>
301 </tr>
302
303 <tr>
304 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
305 <td valign="top">define one or more image format options</td>
306 </tr>
307
308 <tr>
309 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
310 <td valign="top">horizontal and vertical density of the image</td>
311 </tr>
312
313 <tr>
314 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
315 <td valign="top">image depth</td>
316 </tr>
317
318 <tr>
319 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
320 <td valign="top">extract area from image</td>
321 </tr>
322
323 <tr>
cristy7396d882010-01-27 02:37:56 +0000[diff] [blame]324 <td valign="top"><a href="../www/command-line-options.html#features">-features <em class="option">distance</em></a></td>
325 <td valign="top">display image features (e.g. contract, correlations, etc.).</td>
326 </tr>
327
328 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]329 <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
330 <td valign="top">output formatted image characteristics</td>
331 </tr>
332
333 <tr>
334 <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
335 <td valign="top">level of gamma correction</td>
336 </tr>
337
338 <tr>
339 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
340 <td valign="top">print program options</td>
341 </tr>
342
343 <tr>
344 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
345 <td valign="top">type of image interlacing scheme</td>
346 </tr>
347
348 <tr>
349 <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
350 <td valign="top">pixel color interpolation method</td>
351 </tr>
352
353 <tr>
354 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
355 <td valign="top">pixel cache resource limit</td>
356 </tr>
357
358 <tr>
359 <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
360 <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
361 </tr>
362
363 <tr>
364 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
365 <td valign="top">format of debugging information</td>
366 </tr>
367
368 <tr>
369 <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
370 <td valign="top">monitor progress</td>
371 </tr>
372
373 <tr>
cristyb29bc032010-02-01 20:29:43 +0000[diff] [blame]374 <td valign="top"><a href="../www/command-line-options.html#negate">-negate</a></td>
375 <td valign="top">replace each pixel with its complementary color </td>
376 </tr>
377
378 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]379 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
380 <td valign="top">suppress all warning messages</td>
381 </tr>
382
383 <tr>
384 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
385 <td valign="top">pay attention to warning messages.</td>
386 </tr>
387
388 <tr>
389 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
390 <td valign="top">settings remain in effect until parenthesis boundary.</td>
391 </tr>
392
393 <tr>
394 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
395 <td valign="top">horizontal and vertical sampling factor</td>
396 </tr>
397
398 <tr>
399 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
400 <td valign="top">set an image attribute</td>
401 </tr>
402
403 <tr>
404 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
405 <td valign="top">width and height of image</td>
406 </tr>
407
408 <tr>
409 <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
410 <td valign="top">strip image of all profiles and comments</td>
411 </tr>
412
413 <tr>
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]414 <td valign="top"><a href="../www/command-line-options.html#unique">-unique</a></td>
415 <td valign="top">display image the number of unique colors in the image.</td>
416 </tr>
417
418 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]419 <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
420 <td valign="top">the units of image resolution</td>
421 </tr>
422
423 <tr>
424 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
425 <td valign="top">print detailed information about the image</td>
426 </tr>
427
428 <tr>
429 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
430 <td valign="top">print version information</td>
431 </tr>
432
433 <tr>
434 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
435 <td valign="top">access method for pixels outside the boundaries of the image</td>
436 </tr>
437
438 </tbody>
439</table>
440
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