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171<div class="main">
172
173
174
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]175<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
176
177<div class="doc-section">
178<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>
179</div>
180
181<h2><a name="usage"></a>Example Usage</h2>
182<div class="doc-section">
183
184<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>
185
186<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>
187<p>Next, we look at the same image in greater detail:</p>
188
189<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg <br/>
190 Format: JPEG (Joint Photographic Experts Group JFIF format) <br/>
191 Class: DirectClass <br/>
192 Geometry: 70x46+0+0 <br/>
193 Resolution: 72x72 <br/>
194 Print size: 0.972222x0.638889 <br/>
195 Units: PixelsPerInch <br/>
196 Type: TrueColor <br/>
197 Endianess: Undefined <br/>
198 Colorspace: RGB <br/>
199 Depth: 8-bit <br/>
200 Channel depth: <br/>
201 red: 8-bit <br/>
202 green: 8-bit <br/>
203 blue: 8-bit <br/>
204 Channel statistics: <br/>
205 red: <br/>
206 min: 37 (0.145098) <br/>
207 max: 255 (1) <br/>
208 mean: 145.58 (0.5709) <br/>
209 standard deviation: 67.3195 (0.263998) <br/>
210 green: <br/>
211 min: 31 (0.121569) <br/>
212 max: 255 (1) <br/>
213 mean: 89.2512 (0.350005) <br/>
214 standard deviation: 52.0488 (0.204113) <br/>
215 blue: <br/>
216 min: 17 (0.0666667) <br/>
217 max: 255 (1) <br/>
218 mean: 80.4075 (0.315323) <br/>
219 standard deviation: 54.0052 (0.211785) <br/>
220 Rendering intent: Undefined <br/>
221 Interlace: None <br/>
222 Background color: white <br/>
223 Border color: rgb(223,223,223) <br/>
224 Matte color: grey74 <br/>
225 Transparent color: black <br/>
226 Page geometry: 70x46+0+0 <br/>
227 Dispose: Undefined <br/>
228 Iterations: 0 <br/>
229 Compression: JPEG <br/>
230 Quality: 100 <br/>
231 Orientation: Undefined <br/>
232 Properties: <br/>
233 date:create: 2008-01-08T11:08:52-05:00 <br/>
234 date:modify: 2005-04-07T12:48:13-04:00 <br/>
235 jpeg:colorspace: 2 <br/>
236 jpeg:sampling-factor: 2x2,1x1,1x1 <br/>
237 signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc <br/>
238 Artifacts: <br/>
239 verbose: true <br/>
240 Tainted: False <br/>
241 Filesize: 3.97266kb <br/>
242 Number pixels: 3.14453kb <br/>
cristy24ce5cb2010-09-30 01:46:41 +0000[diff] [blame]243 Version: ImageMagick 6.6.4-8 2010-09-21 Q16 http://www.imagemagick.org</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]244<p>To get the print size in inches of an image at 72 DPI, use:</p>
245
246<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>
247<p>The depth and dimensions of a raw image must be specified on the command line:</p>
248
249<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]250<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]251
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]252<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]253<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>
254
255</div>
256
257<h2><a name="options"></a>Option Summary</h2>
258<div class="doc-section">
259
260<p>The <kbd>identify</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
261
262<table class="doc">
263 <tbody>
264 <tr>
265 <th align="left">Option</th>
266 <th align="left">Description</th>
267 </tr>
268
269 <tr>
270 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
271 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
272transparent, extract, background, or shape the alpha channel</td>
273 </tr>
274
275 <tr>
276 <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
277 <td valign="top">remove pixel-aliasing</td>
278 </tr>
279
280 <tr>
281 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
282 <td valign="top">decrypt image with this password</td>
283 </tr>
284
285 <tr>
286 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
287 <td valign="top">apply option to select image channels</td>
288 </tr>
289
290 <tr>
291 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
292 <td valign="top">set image colorspace</td>
293 </tr>
294
295 <tr>
296 <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
297 <td valign="top">crop the image</td>
298 </tr>
299
300 <tr>
301 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
302 <td valign="top">display copious debugging information</td>
303 </tr>
304
305 <tr>
306 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
307 <td valign="top">define one or more image format options</td>
308 </tr>
309
310 <tr>
311 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
312 <td valign="top">horizontal and vertical density of the image</td>
313 </tr>
314
315 <tr>
316 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
317 <td valign="top">image depth</td>
318 </tr>
319
320 <tr>
321 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
322 <td valign="top">extract area from image</td>
323 </tr>
324
325 <tr>
cristy7396d882010-01-27 02:37:56 +0000[diff] [blame]326 <td valign="top"><a href="../www/command-line-options.html#features">-features <em class="option">distance</em></a></td>
327 <td valign="top">display image features (e.g. contract, correlations, etc.).</td>
328 </tr>
329
330 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]331 <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
332 <td valign="top">output formatted image characteristics</td>
333 </tr>
334
335 <tr>
336 <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
337 <td valign="top">level of gamma correction</td>
338 </tr>
339
340 <tr>
341 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
342 <td valign="top">print program options</td>
343 </tr>
344
345 <tr>
346 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
347 <td valign="top">type of image interlacing scheme</td>
348 </tr>
349
350 <tr>
351 <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
352 <td valign="top">pixel color interpolation method</td>
353 </tr>
354
355 <tr>
356 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
357 <td valign="top">pixel cache resource limit</td>
358 </tr>
359
360 <tr>
361 <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
362 <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
363 </tr>
364
365 <tr>
366 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
367 <td valign="top">format of debugging information</td>
368 </tr>
369
370 <tr>
371 <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
372 <td valign="top">monitor progress</td>
373 </tr>
374
375 <tr>
cristyb29bc032010-02-01 20:29:43 +0000[diff] [blame]376 <td valign="top"><a href="../www/command-line-options.html#negate">-negate</a></td>
377 <td valign="top">replace each pixel with its complementary color </td>
378 </tr>
379
380 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]381 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
382 <td valign="top">suppress all warning messages</td>
383 </tr>
384
385 <tr>
386 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
387 <td valign="top">pay attention to warning messages.</td>
388 </tr>
389
390 <tr>
391 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
392 <td valign="top">settings remain in effect until parenthesis boundary.</td>
393 </tr>
394
395 <tr>
396 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
397 <td valign="top">horizontal and vertical sampling factor</td>
398 </tr>
399
400 <tr>
401 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
402 <td valign="top">set an image attribute</td>
403 </tr>
404
405 <tr>
406 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
407 <td valign="top">width and height of image</td>
408 </tr>
409
410 <tr>
411 <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
412 <td valign="top">strip image of all profiles and comments</td>
413 </tr>
414
415 <tr>
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]416 <td valign="top"><a href="../www/command-line-options.html#unique">-unique</a></td>
417 <td valign="top">display image the number of unique colors in the image.</td>
418 </tr>
419
420 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]421 <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
422 <td valign="top">the units of image resolution</td>
423 </tr>
424
425 <tr>
426 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
427 <td valign="top">print detailed information about the image</td>
428 </tr>
429
430 <tr>
431 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
432 <td valign="top">print version information</td>
433 </tr>
434
435 <tr>
436 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
437 <td valign="top">access method for pixels outside the boundaries of the image</td>
438 </tr>
439
440 </tbody>
441</table>
442
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