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cristy3ed852e2009-09-05 21:47:34 +0000157<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
158
159<div class="doc-section">
160<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>
161</div>
162
163<h2><a name="usage"></a>Example Usage</h2>
164<div class="doc-section">
165
166<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>
167
168<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>
169<p>Next, we look at the same image in greater detail:</p>
170
171<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg <br/>
172 Format: JPEG (Joint Photographic Experts Group JFIF format) <br/>
173 Class: DirectClass <br/>
174 Geometry: 70x46+0+0 <br/>
175 Resolution: 72x72 <br/>
176 Print size: 0.972222x0.638889 <br/>
177 Units: PixelsPerInch <br/>
178 Type: TrueColor <br/>
179 Endianess: Undefined <br/>
180 Colorspace: RGB <br/>
181 Depth: 8-bit <br/>
182 Channel depth: <br/>
183 red: 8-bit <br/>
184 green: 8-bit <br/>
185 blue: 8-bit <br/>
186 Channel statistics: <br/>
187 red: <br/>
188 min: 37 (0.145098) <br/>
189 max: 255 (1) <br/>
190 mean: 145.58 (0.5709) <br/>
191 standard deviation: 67.3195 (0.263998) <br/>
192 green: <br/>
193 min: 31 (0.121569) <br/>
194 max: 255 (1) <br/>
195 mean: 89.2512 (0.350005) <br/>
196 standard deviation: 52.0488 (0.204113) <br/>
197 blue: <br/>
198 min: 17 (0.0666667) <br/>
199 max: 255 (1) <br/>
200 mean: 80.4075 (0.315323) <br/>
201 standard deviation: 54.0052 (0.211785) <br/>
202 Rendering intent: Undefined <br/>
203 Interlace: None <br/>
204 Background color: white <br/>
205 Border color: rgb(223,223,223) <br/>
206 Matte color: grey74 <br/>
207 Transparent color: black <br/>
208 Page geometry: 70x46+0+0 <br/>
209 Dispose: Undefined <br/>
210 Iterations: 0 <br/>
211 Compression: JPEG <br/>
212 Quality: 100 <br/>
213 Orientation: Undefined <br/>
214 Properties: <br/>
215 date:create: 2008-01-08T11:08:52-05:00 <br/>
216 date:modify: 2005-04-07T12:48:13-04:00 <br/>
217 jpeg:colorspace: 2 <br/>
218 jpeg:sampling-factor: 2x2,1x1,1x1 <br/>
219 signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc <br/>
220 Artifacts: <br/>
221 verbose: true <br/>
222 Tainted: False <br/>
223 Filesize: 3.97266kb <br/>
224 Number pixels: 3.14453kb <br/>
cristyd2baf7d2010-03-06 04:26:44 +0000225 Version: ImageMagick 6.6.0-3 2010-33-35 Q16 http://www.imagemagick.org</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000226<p>To get the print size in inches of an image at 72 DPI, use:</p>
227
228<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>
229<p>The depth and dimensions of a raw image must be specified on the command line:</p>
230
231<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 +0000232<p>Here we display the image texture features and the number of unique colors in the image:</p>
cristy3ed852e2009-09-05 21:47:34 +0000233
cristy045bd902010-01-30 18:56:24 +0000234<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 +0000235<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>
236
237</div>
238
239<h2><a name="options"></a>Option Summary</h2>
240<div class="doc-section">
241
242<p>The <kbd>identify</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
243
244<table class="doc">
245 <tbody>
246 <tr>
247 <th align="left">Option</th>
248 <th align="left">Description</th>
249 </tr>
250
251 <tr>
252 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
253 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
254transparent, extract, background, or shape the alpha channel</td>
255 </tr>
256
257 <tr>
258 <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
259 <td valign="top">remove pixel-aliasing</td>
260 </tr>
261
262 <tr>
263 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
264 <td valign="top">decrypt image with this password</td>
265 </tr>
266
267 <tr>
268 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
269 <td valign="top">apply option to select image channels</td>
270 </tr>
271
272 <tr>
273 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
274 <td valign="top">set image colorspace</td>
275 </tr>
276
277 <tr>
278 <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
279 <td valign="top">crop the image</td>
280 </tr>
281
282 <tr>
283 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
284 <td valign="top">display copious debugging information</td>
285 </tr>
286
287 <tr>
288 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
289 <td valign="top">define one or more image format options</td>
290 </tr>
291
292 <tr>
293 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
294 <td valign="top">horizontal and vertical density of the image</td>
295 </tr>
296
297 <tr>
298 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
299 <td valign="top">image depth</td>
300 </tr>
301
302 <tr>
303 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
304 <td valign="top">extract area from image</td>
305 </tr>
306
307 <tr>
cristy7396d882010-01-27 02:37:56 +0000308 <td valign="top"><a href="../www/command-line-options.html#features">-features <em class="option">distance</em></a></td>
309 <td valign="top">display image features (e.g. contract, correlations, etc.).</td>
310 </tr>
311
312 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000313 <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
314 <td valign="top">output formatted image characteristics</td>
315 </tr>
316
317 <tr>
318 <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
319 <td valign="top">level of gamma correction</td>
320 </tr>
321
322 <tr>
323 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
324 <td valign="top">print program options</td>
325 </tr>
326
327 <tr>
328 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
329 <td valign="top">type of image interlacing scheme</td>
330 </tr>
331
332 <tr>
333 <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
334 <td valign="top">pixel color interpolation method</td>
335 </tr>
336
337 <tr>
338 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
339 <td valign="top">pixel cache resource limit</td>
340 </tr>
341
342 <tr>
343 <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
344 <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
345 </tr>
346
347 <tr>
348 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
349 <td valign="top">format of debugging information</td>
350 </tr>
351
352 <tr>
353 <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
354 <td valign="top">monitor progress</td>
355 </tr>
356
357 <tr>
cristyb29bc032010-02-01 20:29:43 +0000358 <td valign="top"><a href="../www/command-line-options.html#negate">-negate</a></td>
359 <td valign="top">replace each pixel with its complementary color </td>
360 </tr>
361
362 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000363 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
364 <td valign="top">suppress all warning messages</td>
365 </tr>
366
367 <tr>
368 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
369 <td valign="top">pay attention to warning messages.</td>
370 </tr>
371
372 <tr>
373 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
374 <td valign="top">settings remain in effect until parenthesis boundary.</td>
375 </tr>
376
377 <tr>
378 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
379 <td valign="top">horizontal and vertical sampling factor</td>
380 </tr>
381
382 <tr>
383 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
384 <td valign="top">set an image attribute</td>
385 </tr>
386
387 <tr>
388 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
389 <td valign="top">width and height of image</td>
390 </tr>
391
392 <tr>
393 <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
394 <td valign="top">strip image of all profiles and comments</td>
395 </tr>
396
397 <tr>
cristy045bd902010-01-30 18:56:24 +0000398 <td valign="top"><a href="../www/command-line-options.html#unique">-unique</a></td>
399 <td valign="top">display image the number of unique colors in the image.</td>
400 </tr>
401
402 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000403 <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
404 <td valign="top">the units of image resolution</td>
405 </tr>
406
407 <tr>
408 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
409 <td valign="top">print detailed information about the image</td>
410 </tr>
411
412 <tr>
413 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
414 <td valign="top">print version information</td>
415 </tr>
416
417 <tr>
418 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
419 <td valign="top">access method for pixels outside the boundaries of the image</td>
420 </tr>
421
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423</table>
424
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