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164
165
166
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]167<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
168
169<div class="doc-section">
170<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>
171</div>
172
173<h2><a name="usage"></a>Example Usage</h2>
174<div class="doc-section">
175
176<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>
177
178<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>
179<p>Next, we look at the same image in greater detail:</p>
180
181<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg <br/>
182 Format: JPEG (Joint Photographic Experts Group JFIF format) <br/>
183 Class: DirectClass <br/>
184 Geometry: 70x46+0+0 <br/>
185 Resolution: 72x72 <br/>
186 Print size: 0.972222x0.638889 <br/>
187 Units: PixelsPerInch <br/>
188 Type: TrueColor <br/>
189 Endianess: Undefined <br/>
190 Colorspace: RGB <br/>
191 Depth: 8-bit <br/>
192 Channel depth: <br/>
193 red: 8-bit <br/>
194 green: 8-bit <br/>
195 blue: 8-bit <br/>
196 Channel statistics: <br/>
197 red: <br/>
198 min: 37 (0.145098) <br/>
199 max: 255 (1) <br/>
200 mean: 145.58 (0.5709) <br/>
201 standard deviation: 67.3195 (0.263998) <br/>
202 green: <br/>
203 min: 31 (0.121569) <br/>
204 max: 255 (1) <br/>
205 mean: 89.2512 (0.350005) <br/>
206 standard deviation: 52.0488 (0.204113) <br/>
207 blue: <br/>
208 min: 17 (0.0666667) <br/>
209 max: 255 (1) <br/>
210 mean: 80.4075 (0.315323) <br/>
211 standard deviation: 54.0052 (0.211785) <br/>
212 Rendering intent: Undefined <br/>
213 Interlace: None <br/>
214 Background color: white <br/>
215 Border color: rgb(223,223,223) <br/>
216 Matte color: grey74 <br/>
217 Transparent color: black <br/>
218 Page geometry: 70x46+0+0 <br/>
219 Dispose: Undefined <br/>
220 Iterations: 0 <br/>
221 Compression: JPEG <br/>
222 Quality: 100 <br/>
223 Orientation: Undefined <br/>
224 Properties: <br/>
225 date:create: 2008-01-08T11:08:52-05:00 <br/>
226 date:modify: 2005-04-07T12:48:13-04:00 <br/>
227 jpeg:colorspace: 2 <br/>
228 jpeg:sampling-factor: 2x2,1x1,1x1 <br/>
229 signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc <br/>
230 Artifacts: <br/>
231 verbose: true <br/>
232 Tainted: False <br/>
233 Filesize: 3.97266kb <br/>
234 Number pixels: 3.14453kb <br/>
cristyce69bb02010-07-27 19:49:46 +0000[diff] [blame]235 Version: ImageMagick 6.6.3-1 2010-17-15 Q16 http://www.imagemagick.org</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]236<p>To get the print size in inches of an image at 72 DPI, use:</p>
237
238<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>
239<p>The depth and dimensions of a raw image must be specified on the command line:</p>
240
241<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]242<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]243
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]244<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]245<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>
246
247</div>
248
249<h2><a name="options"></a>Option Summary</h2>
250<div class="doc-section">
251
252<p>The <kbd>identify</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
253
254<table class="doc">
255 <tbody>
256 <tr>
257 <th align="left">Option</th>
258 <th align="left">Description</th>
259 </tr>
260
261 <tr>
262 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
263 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
264transparent, extract, background, or shape the alpha channel</td>
265 </tr>
266
267 <tr>
268 <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
269 <td valign="top">remove pixel-aliasing</td>
270 </tr>
271
272 <tr>
273 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
274 <td valign="top">decrypt image with this password</td>
275 </tr>
276
277 <tr>
278 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
279 <td valign="top">apply option to select image channels</td>
280 </tr>
281
282 <tr>
283 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
284 <td valign="top">set image colorspace</td>
285 </tr>
286
287 <tr>
288 <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
289 <td valign="top">crop the image</td>
290 </tr>
291
292 <tr>
293 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
294 <td valign="top">display copious debugging information</td>
295 </tr>
296
297 <tr>
298 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
299 <td valign="top">define one or more image format options</td>
300 </tr>
301
302 <tr>
303 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
304 <td valign="top">horizontal and vertical density of the image</td>
305 </tr>
306
307 <tr>
308 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
309 <td valign="top">image depth</td>
310 </tr>
311
312 <tr>
313 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
314 <td valign="top">extract area from image</td>
315 </tr>
316
317 <tr>
cristy7396d882010-01-27 02:37:56 +0000[diff] [blame]318 <td valign="top"><a href="../www/command-line-options.html#features">-features <em class="option">distance</em></a></td>
319 <td valign="top">display image features (e.g. contract, correlations, etc.).</td>
320 </tr>
321
322 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]323 <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
324 <td valign="top">output formatted image characteristics</td>
325 </tr>
326
327 <tr>
328 <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
329 <td valign="top">level of gamma correction</td>
330 </tr>
331
332 <tr>
333 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
334 <td valign="top">print program options</td>
335 </tr>
336
337 <tr>
338 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
339 <td valign="top">type of image interlacing scheme</td>
340 </tr>
341
342 <tr>
343 <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
344 <td valign="top">pixel color interpolation method</td>
345 </tr>
346
347 <tr>
348 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
349 <td valign="top">pixel cache resource limit</td>
350 </tr>
351
352 <tr>
353 <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
354 <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
355 </tr>
356
357 <tr>
358 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
359 <td valign="top">format of debugging information</td>
360 </tr>
361
362 <tr>
363 <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
364 <td valign="top">monitor progress</td>
365 </tr>
366
367 <tr>
cristyb29bc032010-02-01 20:29:43 +0000[diff] [blame]368 <td valign="top"><a href="../www/command-line-options.html#negate">-negate</a></td>
369 <td valign="top">replace each pixel with its complementary color </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#quiet">-quiet</a></td>
374 <td valign="top">suppress all warning messages</td>
375 </tr>
376
377 <tr>
378 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
379 <td valign="top">pay attention to warning messages.</td>
380 </tr>
381
382 <tr>
383 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
384 <td valign="top">settings remain in effect until parenthesis boundary.</td>
385 </tr>
386
387 <tr>
388 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
389 <td valign="top">horizontal and vertical sampling factor</td>
390 </tr>
391
392 <tr>
393 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
394 <td valign="top">set an image attribute</td>
395 </tr>
396
397 <tr>
398 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
399 <td valign="top">width and height of image</td>
400 </tr>
401
402 <tr>
403 <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
404 <td valign="top">strip image of all profiles and comments</td>
405 </tr>
406
407 <tr>
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]408 <td valign="top"><a href="../www/command-line-options.html#unique">-unique</a></td>
409 <td valign="top">display image the number of unique colors in the image.</td>
410 </tr>
411
412 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]413 <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
414 <td valign="top">the units of image resolution</td>
415 </tr>
416
417 <tr>
418 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
419 <td valign="top">print detailed information about the image</td>
420 </tr>
421
422 <tr>
423 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
424 <td valign="top">print version information</td>
425 </tr>
426
427 <tr>
428 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
429 <td valign="top">access method for pixels outside the boundaries of the image</td>
430 </tr>
431
432 </tbody>
433</table>
434
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cristy3eaa0ef2010-03-06 20:35:26 +0000[diff] [blame]436
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