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188
189
190
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]191<h1>ImageMagick Identify Command-line Tool</h1>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]192<p class="navigation-index">[<a href="#usage">Example Usage</a> &bull; <a href="#options">Option Summary</a>]</p>
193
194<div class="doc-section">
195<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>
196</div>
197
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]198<h2><a id="usage"></a>Example Usage</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]199<div class="doc-section">
200
201<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>
202
203<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>
204<p>Next, we look at the same image in greater detail:</p>
205
206<p class='crt'><span class="crtprompt"> $magick&gt; </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg <br/>
207 Format: JPEG (Joint Photographic Experts Group JFIF format) <br/>
208 Class: DirectClass <br/>
209 Geometry: 70x46+0+0 <br/>
210 Resolution: 72x72 <br/>
211 Print size: 0.972222x0.638889 <br/>
212 Units: PixelsPerInch <br/>
213 Type: TrueColor <br/>
214 Endianess: Undefined <br/>
215 Colorspace: RGB <br/>
216 Depth: 8-bit <br/>
217 Channel depth: <br/>
218 red: 8-bit <br/>
219 green: 8-bit <br/>
220 blue: 8-bit <br/>
221 Channel statistics: <br/>
222 red: <br/>
223 min: 37 (0.145098) <br/>
224 max: 255 (1) <br/>
225 mean: 145.58 (0.5709) <br/>
226 standard deviation: 67.3195 (0.263998) <br/>
227 green: <br/>
228 min: 31 (0.121569) <br/>
229 max: 255 (1) <br/>
230 mean: 89.2512 (0.350005) <br/>
231 standard deviation: 52.0488 (0.204113) <br/>
232 blue: <br/>
233 min: 17 (0.0666667) <br/>
234 max: 255 (1) <br/>
235 mean: 80.4075 (0.315323) <br/>
236 standard deviation: 54.0052 (0.211785) <br/>
237 Rendering intent: Undefined <br/>
238 Interlace: None <br/>
239 Background color: white <br/>
240 Border color: rgb(223,223,223) <br/>
241 Matte color: grey74 <br/>
242 Transparent color: black <br/>
243 Page geometry: 70x46+0+0 <br/>
244 Dispose: Undefined <br/>
245 Iterations: 0 <br/>
246 Compression: JPEG <br/>
247 Quality: 100 <br/>
248 Orientation: Undefined <br/>
249 Properties: <br/>
250 date:create: 2008-01-08T11:08:52-05:00 <br/>
251 date:modify: 2005-04-07T12:48:13-04:00 <br/>
252 jpeg:colorspace: 2 <br/>
253 jpeg:sampling-factor: 2x2,1x1,1x1 <br/>
254 signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc <br/>
255 Artifacts: <br/>
256 verbose: true <br/>
257 Tainted: False <br/>
258 Filesize: 3.97266kb <br/>
259 Number pixels: 3.14453kb <br/>
cristy70b59b62011-02-07 19:09:57 +0000[diff] [blame]260 Version: ImageMagick 6.6.7-6 2010-61-61 Q16 http://www.imagemagick.org</span></p>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]261<p>To get the print size in inches of an image at 72 DPI, use:</p>
262
263<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>
264<p>The depth and dimensions of a raw image must be specified on the command line:</p>
265
266<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]267<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]268
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]269<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]270<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>
271
272</div>
273
cristydcca3fa2010-12-29 21:50:07 +0000[diff] [blame]274<h2><a id="options"></a>Option Summary</h2>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]275<div class="doc-section">
276
277<p>The <kbd>identify</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
278
279<table class="doc">
280 <tbody>
281 <tr>
282 <th align="left">Option</th>
283 <th align="left">Description</th>
284 </tr>
285
286 <tr>
287 <td valign="top"><a href="../www/command-line-options.html#alpha">-alpha</a></td>
288 <td valign="top">on, activate, off, deactivate, set, opaque, copy",
289transparent, extract, background, or shape the alpha channel</td>
290 </tr>
291
292 <tr>
293 <td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
294 <td valign="top">remove pixel-aliasing</td>
295 </tr>
296
297 <tr>
298 <td valign="top"><a href="../www/command-line-options.html#authenticate">-authenticate <em class="option">value</em></a></td>
299 <td valign="top">decrypt image with this password</td>
300 </tr>
301
302 <tr>
303 <td valign="top"><a href="../www/command-line-options.html#channel">-channel <em class="option">type</em></a></td>
304 <td valign="top">apply option to select image channels</td>
305 </tr>
306
307 <tr>
308 <td valign="top"><a href="../www/command-line-options.html#colorspace">-colorspace <em class="option">type</em></a></td>
309 <td valign="top">set image colorspace</td>
310 </tr>
311
312 <tr>
313 <td valign="top"><a href="../www/command-line-options.html#crop">-crop <em class="option">geometry</em></a></td>
314 <td valign="top">crop the image</td>
315 </tr>
316
317 <tr>
318 <td valign="top"><a href="../www/command-line-options.html#debug">-debug <em class="option">events</em></a></td>
319 <td valign="top">display copious debugging information</td>
320 </tr>
321
322 <tr>
323 <td valign="top"><a href="../www/command-line-options.html#define">-define <em class="option">format:option</em></a></td>
324 <td valign="top">define one or more image format options</td>
325 </tr>
326
327 <tr>
328 <td valign="top"><a href="../www/command-line-options.html#density">-density <em class="option">geometry</em></a></td>
329 <td valign="top">horizontal and vertical density of the image</td>
330 </tr>
331
332 <tr>
333 <td valign="top"><a href="../www/command-line-options.html#depth">-depth <em class="option">value</em></a></td>
334 <td valign="top">image depth</td>
335 </tr>
336
337 <tr>
338 <td valign="top"><a href="../www/command-line-options.html#extract">-extract <em class="option">geometry</em></a></td>
339 <td valign="top">extract area from image</td>
340 </tr>
341
342 <tr>
cristy7396d882010-01-27 02:37:56 +0000[diff] [blame]343 <td valign="top"><a href="../www/command-line-options.html#features">-features <em class="option">distance</em></a></td>
344 <td valign="top">display image features (e.g. contract, correlations, etc.).</td>
345 </tr>
346
347 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]348 <td valign="top"><a href="../www/command-line-options.html#format_identify_">-format <em class="option">string</em></a></td>
349 <td valign="top">output formatted image characteristics</td>
350 </tr>
351
352 <tr>
353 <td valign="top"><a href="../www/command-line-options.html#gamma">-gamma <em class="option">value</em></a></td>
354 <td valign="top">level of gamma correction</td>
355 </tr>
356
357 <tr>
358 <td valign="top"><a href="../www/command-line-options.html#help">-help</a></td>
359 <td valign="top">print program options</td>
360 </tr>
361
362 <tr>
363 <td valign="top"><a href="../www/command-line-options.html#interlace">-interlace <em class="option">type</em></a></td>
364 <td valign="top">type of image interlacing scheme</td>
365 </tr>
366
367 <tr>
368 <td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
369 <td valign="top">pixel color interpolation method</td>
370 </tr>
371
372 <tr>
373 <td valign="top"><a href="../www/command-line-options.html#limit">-limit <em class="option">type value</em></a></td>
374 <td valign="top">pixel cache resource limit</td>
375 </tr>
376
377 <tr>
378 <td valign="top"><a href="../www/command-line-options.html#list">-list <em class="option">type</em></a></td>
379 <td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
380 </tr>
381
382 <tr>
383 <td valign="top"><a href="../www/command-line-options.html#log">-log <em class="option">format</em></a></td>
384 <td valign="top">format of debugging information</td>
385 </tr>
386
387 <tr>
388 <td valign="top"><a href="../www/command-line-options.html#monitor">-monitor</a></td>
389 <td valign="top">monitor progress</td>
390 </tr>
391
392 <tr>
cristyb29bc032010-02-01 20:29:43 +0000[diff] [blame]393 <td valign="top"><a href="../www/command-line-options.html#negate">-negate</a></td>
394 <td valign="top">replace each pixel with its complementary color </td>
395 </tr>
396
397 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]398 <td valign="top"><a href="../www/command-line-options.html#quiet">-quiet</a></td>
399 <td valign="top">suppress all warning messages</td>
400 </tr>
401
402 <tr>
403 <td valign="top"><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
404 <td valign="top">pay attention to warning messages.</td>
405 </tr>
406
407 <tr>
408 <td valign="top"><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
409 <td valign="top">settings remain in effect until parenthesis boundary.</td>
410 </tr>
411
412 <tr>
413 <td valign="top"><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <em class="option">geometry</em></a></td>
414 <td valign="top">horizontal and vertical sampling factor</td>
415 </tr>
416
417 <tr>
418 <td valign="top"><a href="../www/command-line-options.html#set">-set <em class="option">attribute value</em></a></td>
419 <td valign="top">set an image attribute</td>
420 </tr>
421
422 <tr>
423 <td valign="top"><a href="../www/command-line-options.html#size">-size <em class="option">geometry</em></a></td>
424 <td valign="top">width and height of image</td>
425 </tr>
426
427 <tr>
428 <td valign="top"><a href="../www/command-line-options.html#strip">-strip</a></td>
429 <td valign="top">strip image of all profiles and comments</td>
430 </tr>
431
432 <tr>
cristy045bd902010-01-30 18:56:24 +0000[diff] [blame]433 <td valign="top"><a href="../www/command-line-options.html#unique">-unique</a></td>
434 <td valign="top">display image the number of unique colors in the image.</td>
435 </tr>
436
437 <tr>
cristy3ed852e2009-09-05 21:47:34 +0000[diff] [blame]438 <td valign="top"><a href="../www/command-line-options.html#units">-units <em class="option">type</em></a></td>
439 <td valign="top">the units of image resolution</td>
440 </tr>
441
442 <tr>
443 <td valign="top"><a href="../www/command-line-options.html#verbose">-verbose</a></td>
444 <td valign="top">print detailed information about the image</td>
445 </tr>
446
447 <tr>
448 <td valign="top"><a href="../www/command-line-options.html#version">-version</a></td>
449 <td valign="top">print version information</td>
450 </tr>
451
452 <tr>
453 <td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <em class="option">method</em></a></td>
454 <td valign="top">access method for pixels outside the boundaries of the image</td>
455 </tr>
456
457 </tbody>
458</table>
459
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