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152
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]153<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
154
155<div class="doc-section">
156<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>
157</div>
158
159<h2><a name="usage"></a>Example Usage</h2>
160<div class="doc-section">
161
162<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>
163
164<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>
165<p>Next, we look at the same image in greater detail:</p>
166
167<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg <br/>
168 Format: JPEG (Joint Photographic Experts Group JFIF format) <br/>
169 Class: DirectClass <br/>
170 Geometry: 70x46+0+0 <br/>
171 Resolution: 72x72 <br/>
172 Print size: 0.972222x0.638889 <br/>
173 Units: PixelsPerInch <br/>
174 Type: TrueColor <br/>
175 Endianess: Undefined <br/>
176 Colorspace: RGB <br/>
177 Depth: 8-bit <br/>
178 Channel depth: <br/>
179 red: 8-bit <br/>
180 green: 8-bit <br/>
181 blue: 8-bit <br/>
182 Channel statistics: <br/>
183 red: <br/>
184 min: 37 (0.145098) <br/>
185 max: 255 (1) <br/>
186 mean: 145.58 (0.5709) <br/>
187 standard deviation: 67.3195 (0.263998) <br/>
188 green: <br/>
189 min: 31 (0.121569) <br/>
190 max: 255 (1) <br/>
191 mean: 89.2512 (0.350005) <br/>
192 standard deviation: 52.0488 (0.204113) <br/>
193 blue: <br/>
194 min: 17 (0.0666667) <br/>
195 max: 255 (1) <br/>
196 mean: 80.4075 (0.315323) <br/>
197 standard deviation: 54.0052 (0.211785) <br/>
198 Rendering intent: Undefined <br/>
199 Interlace: None <br/>
200 Background color: white <br/>
201 Border color: rgb(223,223,223) <br/>
202 Matte color: grey74 <br/>
203 Transparent color: black <br/>
204 Page geometry: 70x46+0+0 <br/>
205 Dispose: Undefined <br/>
206 Iterations: 0 <br/>
207 Compression: JPEG <br/>
208 Quality: 100 <br/>
209 Orientation: Undefined <br/>
210 Properties: <br/>
211 date:create: 2008-01-08T11:08:52-05:00 <br/>
212 date:modify: 2005-04-07T12:48:13-04:00 <br/>
213 jpeg:colorspace: 2 <br/>
214 jpeg:sampling-factor: 2x2,1x1,1x1 <br/>
215 signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc <br/>
216 Artifacts: <br/>
217 verbose: true <br/>
218 Tainted: False <br/>
219 Filesize: 3.97266kb <br/>
220 Number pixels: 3.14453kb <br/>
cristy5cadd612009-09-21 19:33:41 +0000[diff] [blame]221 Version: ImageMagick 6.5.6-3 2009-09-35 Q16 http://www.imagemagick.org</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]222<p>To get the print size in inches of an image at 72 DPI, use:</p>
223
224<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>
225<p>The depth and dimensions of a raw image must be specified on the command line:</p>
226
227<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>
228<p>Here we display the number of unique colors in the image:</p>
229
230<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -define unique=true -verbose image.png</span></p>
231<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>
232
233</div>
234
235<h2><a name="options"></a>Option Summary</h2>
236<div class="doc-section">
237
238<p>The <kbd>identify</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
239
240<table class="doc">
241 <tbody>
242 <tr>
243 <th align="left">Option</th>
244 <th align="left">Description</th>
245 </tr>
246
247 <tr>
248 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
249 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
250transparent, extract, background, or shape the alpha channel</td>
251 </tr>
252
253 <tr>
254 <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
255 <td valign="top">remove pixel-aliasing</td>
256 </tr>
257
258 <tr>
259 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
260 <td valign="top">decrypt image with this password</td>
261 </tr>
262
263 <tr>
264 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
265 <td valign="top">apply option to select image channels</td>
266 </tr>
267
268 <tr>
269 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
270 <td valign="top">set image colorspace</td>
271 </tr>
272
273 <tr>
274 <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
275 <td valign="top">crop the image</td>
276 </tr>
277
278 <tr>
279 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
280 <td valign="top">display copious debugging information</td>
281 </tr>
282
283 <tr>
284 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
285 <td valign="top">define one or more image format options</td>
286 </tr>
287
288 <tr>
289 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
290 <td valign="top">horizontal and vertical density of the image</td>
291 </tr>
292
293 <tr>
294 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
295 <td valign="top">image depth</td>
296 </tr>
297
298 <tr>
299 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
300 <td valign="top">extract area from image</td>
301 </tr>
302
303 <tr>
304 <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
305 <td valign="top">output formatted image characteristics</td>
306 </tr>
307
308 <tr>
309 <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
310 <td valign="top">level of gamma correction</td>
311 </tr>
312
313 <tr>
314 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
315 <td valign="top">print program options</td>
316 </tr>
317
318 <tr>
319 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
320 <td valign="top">type of image interlacing scheme</td>
321 </tr>
322
323 <tr>
324 <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
325 <td valign="top">pixel color interpolation method</td>
326 </tr>
327
328 <tr>
329 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
330 <td valign="top">pixel cache resource limit</td>
331 </tr>
332
333 <tr>
334 <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
335 <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
336 </tr>
337
338 <tr>
339 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
340 <td valign="top">format of debugging information</td>
341 </tr>
342
343 <tr>
344 <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
345 <td valign="top">monitor progress</td>
346 </tr>
347
348 <tr>
349 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
350 <td valign="top">suppress all warning messages</td>
351 </tr>
352
353 <tr>
354 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
355 <td valign="top">pay attention to warning messages.</td>
356 </tr>
357
358 <tr>
359 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
360 <td valign="top">settings remain in effect until parenthesis boundary.</td>
361 </tr>
362
363 <tr>
364 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
365 <td valign="top">horizontal and vertical sampling factor</td>
366 </tr>
367
368 <tr>
369 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
370 <td valign="top">set an image attribute</td>
371 </tr>
372
373 <tr>
374 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
375 <td valign="top">width and height of image</td>
376 </tr>
377
378 <tr>
379 <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
380 <td valign="top">strip image of all profiles and comments</td>
381 </tr>
382
383 <tr>
384 <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
385 <td valign="top">the units of image resolution</td>
386 </tr>
387
388 <tr>
389 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
390 <td valign="top">print detailed information about the image</td>
391 </tr>
392
393 <tr>
394 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
395 <td valign="top">print version information</td>
396 </tr>
397
398 <tr>
399 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
400 <td valign="top">access method for pixels outside the boundaries of the image</td>
401 </tr>
402
403 </tbody>
404</table>
405
406</div>
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