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cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]160<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
161
162<div class="doc-section">
163<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>
164</div>
165
166<h2><a name="usage"></a>Example Usage</h2>
167<div class="doc-section">
168
169<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>
170
171<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>
172<p>Next, we look at the same image in greater detail:</p>
173
174<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg <br/>
175 Format: JPEG (Joint Photographic Experts Group JFIF format) <br/>
176 Class: DirectClass <br/>
177 Geometry: 70x46+0+0 <br/>
178 Resolution: 72x72 <br/>
179 Print size: 0.972222x0.638889 <br/>
180 Units: PixelsPerInch <br/>
181 Type: TrueColor <br/>
182 Endianess: Undefined <br/>
183 Colorspace: RGB <br/>
184 Depth: 8-bit <br/>
185 Channel depth: <br/>
186 red: 8-bit <br/>
187 green: 8-bit <br/>
188 blue: 8-bit <br/>
189 Channel statistics: <br/>
190 red: <br/>
191 min: 37 (0.145098) <br/>
192 max: 255 (1) <br/>
193 mean: 145.58 (0.5709) <br/>
194 standard deviation: 67.3195 (0.263998) <br/>
195 green: <br/>
196 min: 31 (0.121569) <br/>
197 max: 255 (1) <br/>
198 mean: 89.2512 (0.350005) <br/>
199 standard deviation: 52.0488 (0.204113) <br/>
200 blue: <br/>
201 min: 17 (0.0666667) <br/>
202 max: 255 (1) <br/>
203 mean: 80.4075 (0.315323) <br/>
204 standard deviation: 54.0052 (0.211785) <br/>
205 Rendering intent: Undefined <br/>
206 Interlace: None <br/>
207 Background color: white <br/>
208 Border color: rgb(223,223,223) <br/>
209 Matte color: grey74 <br/>
210 Transparent color: black <br/>
211 Page geometry: 70x46+0+0 <br/>
212 Dispose: Undefined <br/>
213 Iterations: 0 <br/>
214 Compression: JPEG <br/>
215 Quality: 100 <br/>
216 Orientation: Undefined <br/>
217 Properties: <br/>
218 date:create: 2008-01-08T11:08:52-05:00 <br/>
219 date:modify: 2005-04-07T12:48:13-04:00 <br/>
220 jpeg:colorspace: 2 <br/>
221 jpeg:sampling-factor: 2x2,1x1,1x1 <br/>
222 signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc <br/>
223 Artifacts: <br/>
224 verbose: true <br/>
225 Tainted: False <br/>
226 Filesize: 3.97266kb <br/>
227 Number pixels: 3.14453kb <br/>
cristyfcb2a812009-12-27 20:24:28 +0000[diff] [blame]228 Version: ImageMagick 6.5.8-9 2010-01-01 Q16 http://www.imagemagick.org</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]229<p>To get the print size in inches of an image at 72 DPI, use:</p>
230
231<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>
232<p>The depth and dimensions of a raw image must be specified on the command line:</p>
233
234<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>
235<p>Here we display the number of unique colors in the image:</p>
236
237<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -define unique=true -verbose image.png</span></p>
238<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>
239
240</div>
241
242<h2><a name="options"></a>Option Summary</h2>
243<div class="doc-section">
244
245<p>The <kbd>identify</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
246
247<table class="doc">
248 <tbody>
249 <tr>
250 <th align="left">Option</th>
251 <th align="left">Description</th>
252 </tr>
253
254 <tr>
255 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
256 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
257transparent, extract, background, or shape the alpha channel</td>
258 </tr>
259
260 <tr>
261 <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
262 <td valign="top">remove pixel-aliasing</td>
263 </tr>
264
265 <tr>
266 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
267 <td valign="top">decrypt image with this password</td>
268 </tr>
269
270 <tr>
271 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
272 <td valign="top">apply option to select image channels</td>
273 </tr>
274
275 <tr>
276 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
277 <td valign="top">set image colorspace</td>
278 </tr>
279
280 <tr>
281 <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
282 <td valign="top">crop the image</td>
283 </tr>
284
285 <tr>
286 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
287 <td valign="top">display copious debugging information</td>
288 </tr>
289
290 <tr>
291 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
292 <td valign="top">define one or more image format options</td>
293 </tr>
294
295 <tr>
296 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
297 <td valign="top">horizontal and vertical density of the image</td>
298 </tr>
299
300 <tr>
301 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
302 <td valign="top">image depth</td>
303 </tr>
304
305 <tr>
306 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
307 <td valign="top">extract area from image</td>
308 </tr>
309
310 <tr>
311 <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
312 <td valign="top">output formatted image characteristics</td>
313 </tr>
314
315 <tr>
316 <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
317 <td valign="top">level of gamma correction</td>
318 </tr>
319
320 <tr>
321 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
322 <td valign="top">print program options</td>
323 </tr>
324
325 <tr>
326 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
327 <td valign="top">type of image interlacing scheme</td>
328 </tr>
329
330 <tr>
331 <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
332 <td valign="top">pixel color interpolation method</td>
333 </tr>
334
335 <tr>
336 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
337 <td valign="top">pixel cache resource limit</td>
338 </tr>
339
340 <tr>
341 <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
342 <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
343 </tr>
344
345 <tr>
346 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
347 <td valign="top">format of debugging information</td>
348 </tr>
349
350 <tr>
351 <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
352 <td valign="top">monitor progress</td>
353 </tr>
354
355 <tr>
356 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
357 <td valign="top">suppress all warning messages</td>
358 </tr>
359
360 <tr>
361 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
362 <td valign="top">pay attention to warning messages.</td>
363 </tr>
364
365 <tr>
366 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
367 <td valign="top">settings remain in effect until parenthesis boundary.</td>
368 </tr>
369
370 <tr>
371 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
372 <td valign="top">horizontal and vertical sampling factor</td>
373 </tr>
374
375 <tr>
376 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
377 <td valign="top">set an image attribute</td>
378 </tr>
379
380 <tr>
381 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
382 <td valign="top">width and height of image</td>
383 </tr>
384
385 <tr>
386 <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
387 <td valign="top">strip image of all profiles and comments</td>
388 </tr>
389
390 <tr>
391 <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
392 <td valign="top">the units of image resolution</td>
393 </tr>
394
395 <tr>
396 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
397 <td valign="top">print detailed information about the image</td>
398 </tr>
399
400 <tr>
401 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
402 <td valign="top">print version information</td>
403 </tr>
404
405 <tr>
406 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
407 <td valign="top">access method for pixels outside the boundaries of the image</td>
408 </tr>
409
410 </tbody>
411</table>
412
413</div>
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