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cristyf3bb4782009-09-08 13:10:04 +0000[diff] [blame]146
147
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149
150<div class="main">
151
152
153
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]154<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
155
156<div class="doc-section">
157<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>
158</div>
159
160<h2><a name="usage"></a>Example Usage</h2>
161<div class="doc-section">
162
163<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>
164
165<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>
166<p>Next, we look at the same image in greater detail:</p>
167
168<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg <br/>
169 Format: JPEG (Joint Photographic Experts Group JFIF format) <br/>
170 Class: DirectClass <br/>
171 Geometry: 70x46+0+0 <br/>
172 Resolution: 72x72 <br/>
173 Print size: 0.972222x0.638889 <br/>
174 Units: PixelsPerInch <br/>
175 Type: TrueColor <br/>
176 Endianess: Undefined <br/>
177 Colorspace: RGB <br/>
178 Depth: 8-bit <br/>
179 Channel depth: <br/>
180 red: 8-bit <br/>
181 green: 8-bit <br/>
182 blue: 8-bit <br/>
183 Channel statistics: <br/>
184 red: <br/>
185 min: 37 (0.145098) <br/>
186 max: 255 (1) <br/>
187 mean: 145.58 (0.5709) <br/>
188 standard deviation: 67.3195 (0.263998) <br/>
189 green: <br/>
190 min: 31 (0.121569) <br/>
191 max: 255 (1) <br/>
192 mean: 89.2512 (0.350005) <br/>
193 standard deviation: 52.0488 (0.204113) <br/>
194 blue: <br/>
195 min: 17 (0.0666667) <br/>
196 max: 255 (1) <br/>
197 mean: 80.4075 (0.315323) <br/>
198 standard deviation: 54.0052 (0.211785) <br/>
199 Rendering intent: Undefined <br/>
200 Interlace: None <br/>
201 Background color: white <br/>
202 Border color: rgb(223,223,223) <br/>
203 Matte color: grey74 <br/>
204 Transparent color: black <br/>
205 Page geometry: 70x46+0+0 <br/>
206 Dispose: Undefined <br/>
207 Iterations: 0 <br/>
208 Compression: JPEG <br/>
209 Quality: 100 <br/>
210 Orientation: Undefined <br/>
211 Properties: <br/>
212 date:create: 2008-01-08T11:08:52-05:00 <br/>
213 date:modify: 2005-04-07T12:48:13-04:00 <br/>
214 jpeg:colorspace: 2 <br/>
215 jpeg:sampling-factor: 2x2,1x1,1x1 <br/>
216 signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc <br/>
217 Artifacts: <br/>
218 verbose: true <br/>
219 Tainted: False <br/>
220 Filesize: 3.97266kb <br/>
221 Number pixels: 3.14453kb <br/>
cristy13538962010-02-26 17:53:04 +0000[diff] [blame]222 Version: ImageMagick 6.6.0-0 2010-02-21 Q16 http://www.imagemagick.org</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]223<p>To get the print size in inches of an image at 72 DPI, use:</p>
224
225<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>
226<p>The depth and dimensions of a raw image must be specified on the command line:</p>
227
228<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]229<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]230
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]231<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]232<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>
233
234</div>
235
236<h2><a name="options"></a>Option Summary</h2>
237<div class="doc-section">
238
239<p>The <kbd>identify</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
240
241<table class="doc">
242 <tbody>
243 <tr>
244 <th align="left">Option</th>
245 <th align="left">Description</th>
246 </tr>
247
248 <tr>
249 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
250 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
251transparent, extract, background, or shape the alpha channel</td>
252 </tr>
253
254 <tr>
255 <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
256 <td valign="top">remove pixel-aliasing</td>
257 </tr>
258
259 <tr>
260 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
261 <td valign="top">decrypt image with this password</td>
262 </tr>
263
264 <tr>
265 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
266 <td valign="top">apply option to select image channels</td>
267 </tr>
268
269 <tr>
270 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
271 <td valign="top">set image colorspace</td>
272 </tr>
273
274 <tr>
275 <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
276 <td valign="top">crop the image</td>
277 </tr>
278
279 <tr>
280 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
281 <td valign="top">display copious debugging information</td>
282 </tr>
283
284 <tr>
285 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
286 <td valign="top">define one or more image format options</td>
287 </tr>
288
289 <tr>
290 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
291 <td valign="top">horizontal and vertical density of the image</td>
292 </tr>
293
294 <tr>
295 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
296 <td valign="top">image depth</td>
297 </tr>
298
299 <tr>
300 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
301 <td valign="top">extract area from image</td>
302 </tr>
303
304 <tr>
cristy7396d882010-01-27 02:37:56 +0000[diff] [blame]305 <td valign="top"><a href="../www/command-line-options.html#features">-features <em class="option">distance</em></a></td>
306 <td valign="top">display image features (e.g. contract, correlations, etc.).</td>
307 </tr>
308
309 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]310 <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
311 <td valign="top">output formatted image characteristics</td>
312 </tr>
313
314 <tr>
315 <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
316 <td valign="top">level of gamma correction</td>
317 </tr>
318
319 <tr>
320 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
321 <td valign="top">print program options</td>
322 </tr>
323
324 <tr>
325 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
326 <td valign="top">type of image interlacing scheme</td>
327 </tr>
328
329 <tr>
330 <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
331 <td valign="top">pixel color interpolation method</td>
332 </tr>
333
334 <tr>
335 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
336 <td valign="top">pixel cache resource limit</td>
337 </tr>
338
339 <tr>
340 <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
341 <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
342 </tr>
343
344 <tr>
345 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
346 <td valign="top">format of debugging information</td>
347 </tr>
348
349 <tr>
350 <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
351 <td valign="top">monitor progress</td>
352 </tr>
353
354 <tr>
cristyb29bc032010-02-01 20:29:43 +0000[diff] [blame]355 <td valign="top"><a href="../www/command-line-options.html#negate">-negate</a></td>
356 <td valign="top">replace each pixel with its complementary color </td>
357 </tr>
358
359 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]360 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
361 <td valign="top">suppress all warning messages</td>
362 </tr>
363
364 <tr>
365 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
366 <td valign="top">pay attention to warning messages.</td>
367 </tr>
368
369 <tr>
370 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
371 <td valign="top">settings remain in effect until parenthesis boundary.</td>
372 </tr>
373
374 <tr>
375 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
376 <td valign="top">horizontal and vertical sampling factor</td>
377 </tr>
378
379 <tr>
380 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
381 <td valign="top">set an image attribute</td>
382 </tr>
383
384 <tr>
385 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
386 <td valign="top">width and height of image</td>
387 </tr>
388
389 <tr>
390 <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
391 <td valign="top">strip image of all profiles and comments</td>
392 </tr>
393
394 <tr>
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]395 <td valign="top"><a href="../www/command-line-options.html#unique">-unique</a></td>
396 <td valign="top">display image the number of unique colors in the image.</td>
397 </tr>
398
399 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]400 <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
401 <td valign="top">the units of image resolution</td>
402 </tr>
403
404 <tr>
405 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
406 <td valign="top">print detailed information about the image</td>
407 </tr>
408
409 <tr>
410 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
411 <td valign="top">print version information</td>
412 </tr>
413
414 <tr>
415 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
416 <td valign="top">access method for pixels outside the boundaries of the image</td>
417 </tr>
418
419 </tbody>
420</table>
421
422</div>
cristyf3bb4782009-09-08 13:10:04 +0000[diff] [blame]423
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