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/ImageMagick/script/identify.html

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  53. <div class="container">
    54. 

  54. <div class="magick-header">
    55. 

  55. <p class="text-center"><a href="identify.php#usage">Example Usage</a> • <a href="identify.php#options">Option Summary</a></p>
    56. 

  56. 

  57. <p class="lead magick-description">The <code>identify</code> 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="command-line-processing.php">Command Line Processing</a> for advice on how to structure your <code>identify</code> command or see below for example usages of the command.</p>
    58. 

  58. 

  59. <h2 class="magick-header"><a id="usage"></a>Example Usage</h2>
    60. 

  60. 

  61. <p>We list a few examples of the <code>identify</code> command here to illustrate its usefulness and ease of use. To get started, lets identify an image in the JPEG format:</p>
    62. 

  62. 

  63. <pre>
    64. 

  64. -> identify rose.jpg
    65. 

  65. rose.jpg JPEG 70x46 70x46+0+0 8-bit sRGB 2.36KB 0.000u 0:00.000
    66. 

  66. </pre>
    67. 

  67. 

  68. <p>Next, we look at the same image in greater detail:</p>
    69. 

  69. 

  70. <pre class="pre-scrollable">-> identify -verbose rose.jpg
    71. 

  71. Image: rose.jpg
    72. 

  72.   Format: JPEG (Joint Photographic Experts Group JFIF format)
    73. 

  73.   Mime type: image/jpeg
    74. 

  74.   Class: DirectClass
    75. 

  75.   Geometry: 70x46+0+0
    76. 

  76.   Units: Undefined
    77. 

  77.   Type: TrueColor
    78. 

  78.   Endianess: Undefined
    79. 

  79.   Colorspace: sRGB
    80. 

  80.   Depth: 8-bit
    81. 

  81.   Channel depth:
    82. 

  82.     red: 8-bit
    83. 

  83.     green: 8-bit
    84. 

  84.     blue: 8-bit
    85. 

  85.   Channel statistics:
    86. 

  86.     Pixels: 3220
    87. 

  87.     Red:
    88. 

  88.       min: 35 (0.137255)
    89. 

  89.       max: 255 (1)
    90. 

  90.       mean: 145.57 (0.570865)
    91. 

  91.       standard deviation: 67.2976 (0.263912)
    92. 

  92.       kurtosis: -1.37971
    93. 

  93.       skewness: 0.0942169
    94. 

  94.       entropy: 0.974889
    95. 

  95.     Green:
    96. 

  96.       min: 33 (0.129412)
    97. 

  97.       max: 255 (1)
    98. 

  98.       mean: 89.2193 (0.349879)
    99. 

  99.       standard deviation: 52.0803 (0.204236)
    100. 

  100.       kurtosis: 2.70722
    101. 

  101.       skewness: 1.82562
    102. 

  102.       entropy: 0.877139
    103. 

  103.     Blue:
    104. 

  104.       min: 11 (0.0431373)
    105. 

  105.       max: 255 (1)
    106. 

  106.       mean: 80.3742 (0.315193)
    107. 

  107.       standard deviation: 53.8536 (0.21119)
    108. 

  108.       kurtosis: 2.90978
    109. 

  109.       skewness: 1.92617
    110. 

  110.       entropy: 0.866692
    111. 

  111.   Image statistics:
    112. 

  112.     Overall:
    113. 

  113.       min: 11 (0.0431373)
    114. 

  114.       max: 255 (1)
    115. 

  115.       mean: 105.055 (0.411979)
    116. 

  116.       standard deviation: 58.1422 (0.228008)
    117. 

  117.       kurtosis: 1.25759
    118. 

  118.       skewness: 1.4277
    119. 

  119.       entropy: 0.90624
    120. 

  120.   Rendering intent: Perceptual
    121. 

  121.   Gamma: 0.454545
    122. 

  122.   Chromaticity:
    123. 

  123.     red primary: (0.64,0.33)
    124. 

  124.     green primary: (0.3,0.6)
    125. 

  125.     blue primary: (0.15,0.06)
    126. 

  126.     white point: (0.3127,0.329)
    127. 

  127.   Background color: white
    128. 

  128.   Border color: srgb(223,223,223)
    129. 

  129.   Matte color: grey74
    130. 

  130.   Transparent color: black
    131. 

  131.   Interlace: None
    132. 

  132.   Intensity: Undefined
    133. 

  133.   Compose: Over
    134. 

  134.   Page geometry: 70x46+0+0
    135. 

  135.   Dispose: Undefined
    136. 

  136.   Iterations: 0
    137. 

  137.   Compression: JPEG
    138. 

  138.   Quality: 92
    139. 

  139.   Orientation: Undefined
    140. 

  140.   Properties:
    141. 

  141.     date:create: 2014-11-09T09:00:35-05:00
    142. 

  142.     date:modify: 2014-11-09T09:00:35-05:00
    143. 

  143.     jpeg:colorspace: 2
    144. 

  144.     jpeg:sampling-factor: 2x2,1x1,1x1
    145. 

  145.     signature: 22a99838bd5594250f706d1d9383b2830f439fcbaf1455cbe2f7f59a4deb065a
    146. 

  146.   Artifacts:
    147. 

  147.     filename: rose.jpg
    148. 

  148.     verbose: true
    149. 

  149.   Tainted: False
    150. 

  150.   Filesize: 2.36KB
    151. 

  151.   Number pixels: 3.22K
    152. 

  152.   Pixels per second: 3.22EB
    153. 

  153.   User time: 0.000u
    154. 

  154.   Elapsed time: 0:01.000
    155. 

  155.   Version: ImageMagick Q16 http://www.imagemagick.org
    156. 

  156. </pre>
    157. 

  157. 

  158. <p>To get the print size in inches of an image at 72 DPI, use:</p>
    159. 

  159. 

  160. <pre>
    161. 

  161. -> identify -format "%[fx:w/72] by %[fx:h/72] inches" document.png
    162. 

  162. 8.5 x 11 inches
    163. 

  163. </pre>
    164. 

  164. 

  165. <p>The depth and dimensions of a raw image must be specified on the command line:</p>
    166. 

  166. 

  167. <pre>
    168. 

  168. -> identify -depth 8 -size 640x480 image.raw
    169. 

  169. image.raw RGB 640x480 sRGB 9kb 0.000u 0:01
    170. 

  170. </pre>
    171. 

  171. 

  172. <p>Here we display the image texture features, moments, perceptual hash, and the number of unique colors in the image:</p>
    173. 

  173. 

  174. <pre>
    175. 

  175. -> identify -verbose -features 1 -moments -unique image.png
    176. 

  176. </pre>
    177. 

  177. 

  178. <p>Here is a special define that outputs the location of the minimum or maximum pixel of the image:</p>
    179. 

  179. 

  180. <pre>
    181. 

  181. identify -precision 5 -define identify:locate=maximum -define identify:limit=3 image.png
    182. 

  182. </pre>
    183. 

  183. 

  184. <p>You can find additional examples of using <code>identify</code> in <a href="http://www.imagemagick.org/Usage/">Examples of ImageMagick Usage</a>.</p>
    185. 

  185. 

  186. <h2 class="magick-header"><a id="options"></a>Option Summary</h2>
    187. 

  187. 

  188. <p>The <code>identify</code> command recognizes these options.  Click on an option to get more details about how that option works.</p>
    189. 

  189. 

  190. <table class="table table-condensed table-striped">
    191. 

  191.   <tbody>
    192. 

  192.   <tr>
    193. 

  193.     <th align="left">Option</th>
    194. 

  194.     <th align="left">Description</th>
    195. 

  195.   </tr>
    196. 

  196. 

  197.   <tr>
    198. 

  198.     <td><a href="command-line-options.php#alpha">-alpha</a></td>
    199. 

  199.     <td>on, activate, off, deactivate, set, opaque, copy",
    200. 

  200. transparent, extract, background, or shape the alpha channel</td>
    201. 

  201.   </tr>
    202. 

  202. 

  203.   <tr>
    204. 

  204.     <td><a href="command-line-options.php#antialias">-antialias</a></td>
    205. 

  205.     <td>remove pixel-aliasing</td>
    206. 

  206.   </tr>
    207. 

  207. 

  208.   <tr>
    209. 

  209.     <td><a href="command-line-options.php#authenticate">-authenticate <var>value</var></a></td>
    210. 

  210.     <td>decrypt image with this password</td>
    211. 

  211.   </tr>
    212. 

  212. 

  213.   <tr>
    214. 

  214.     <td><a href="command-line-options.php#channel">-channel <var>type</var></a></td>
    215. 

  215.     <td>apply option to select image channels</td>
    216. 

  216.   </tr>
    217. 

  217. 

  218.   <tr>
    219. 

  219.     <td><a href="command-line-options.php#clip">-clip</a></td>
    220. 

  220.     <td>clip along the first path from the 8BIM profile</td>
    221. 

  221.   </tr>
    222. 

  222. 

  223.   <tr>
    224. 

  224.     <td><a href="command-line-options.php#clip-mask">-clip-mask</a> <var>filename</var></td>
    225. 

  225.     <td>associate clip mask with the image</td>
    226. 

  226.   </tr>
    227. 

  227. 

  228.   <tr>
    229. 

  229.     <td><a href="command-line-options.php#clip-path">-clip-path <var>id</var></a></td>
    230. 

  230.     <td>clip along a named path from the 8BIM profile</td>
    231. 

  231.   </tr>
    232. 

  232. 

  233.   <tr>
    234. 

  234.     <td><a href="command-line-options.php#colorspace">-colorspace <var>type</var></a></td>
    235. 

  235.     <td>set image colorspace</td>
    236. 

  236.   </tr>
    237. 

  237. 

  238.   <tr>
    239. 

  239.     <td><a href="command-line-options.php#crop">-crop <var>geometry</var></a></td>
    240. 

  240.     <td>crop the image</td>
    241. 

  241.   </tr>
    242. 

  242. 

  243.   <tr>
    244. 

  244.     <td><a href="command-line-options.php#debug">-debug <var>events</var></a></td>
    245. 

  245.     <td>display copious debugging information</td>
    246. 

  246.   </tr>
    247. 

  247. 

  248.   <tr>
    249. 

  249.     <td><a href="command-line-options.php#define">-define <var>format:option</var></a></td>
    250. 

  250.     <td>define one or more image format options</td>
    251. 

  251.   </tr>
    252. 

  252. 

  253.   <tr>
    254. 

  254.     <td><a href="command-line-options.php#density">-density <var>geometry</var></a></td>
    255. 

  255.     <td>horizontal and vertical density of the image</td>
    256. 

  256.   </tr>
    257. 

  257. 

  258.   <tr>
    259. 

  259.     <td><a href="command-line-options.php#depth">-depth <var>value</var></a></td>
    260. 

  260.     <td>image depth</td>
    261. 

  261.   </tr>
    262. 

  262. 

  263.   <tr>
    264. 

  264.     <td><a href="command-line-options.php#endian">-endian <var>type</var></a></td>
    265. 

  265.     <td>endianness (MSB or LSB) of the image</td>
    266. 

  266.   </tr>
    267. 

  267. 

  268.   <tr>
    269. 

  269.     <td><a href="command-line-options.php#extract">-extract <var>geometry</var></a></td>
    270. 

  270.     <td>extract area from image</td>
    271. 

  271.   </tr>
    272. 

  272. 

  273.   <tr>
    274. 

  274.     <td><a href="command-line-options.php#features">-features <var>distance</var></a></td>
    275. 

  275.     <td>analyze image features (e.g. contract, correlations, etc.).</td>
    276. 

  276.   </tr>
    277. 

  277. 

  278.   <tr>
    279. 

  279.     <td><a href="command-line-options.php#format_identify_">-format <var>string</var></a></td>
    280. 

  280.     <td>output formatted image characteristics</td>
    281. 

  281.   </tr>
    282. 

  282. 

  283.   <tr>
    284. 

  284.     <td><a href="command-line-options.php#gamma">-gamma <var>value</var></a></td>
    285. 

  285.     <td>level of gamma correction</td>
    286. 

  286.   </tr>
    287. 

  287. 

  288.   <tr>
    289. 

  289.     <td><a href="command-line-options.php#intensity">-grayscale <var>method</var></a></td>
    290. 

  290.     <td>convert image to grayscale</td>
    291. 

  291.   </tr>
    292. 

  292. 

  293.   <tr>
    294. 

  294.     <td><a href="command-line-options.php#help">-help</a></td>
    295. 

  295.     <td>print program options</td>
    296. 

  296.   </tr>
    297. 

  297. 

  298.   <tr>
    299. 

  299.     <td><a href="command-line-options.php#interlace">-interlace <var>type</var></a></td>
    300. 

  300.     <td>type of image interlacing scheme</td>
    301. 

  301.   </tr>
    302. 

  302. 

  303.   <tr>
    304. 

  304.     <td><a href="command-line-options.php#interpolate">-interpolate <var>method</var></a></td>
    305. 

  305.     <td>pixel color interpolation method</td>
    306. 

  306.   </tr>
    307. 

  307. 

  308.   <tr>
    309. 

  309.     <td><a href="command-line-options.php#limit">-limit <var>type value</var></a></td>
    310. 

  310.     <td>pixel cache resource limit</td>
    311. 

  311.   </tr>
    312. 

  312. 

  313.   <tr>
    314. 

  314.     <td><a href="command-line-options.php#list">-list <var>type</var></a></td>
    315. 

  315.     <td>Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
    316. 

  316.   </tr>
    317. 

  317. 

  318.   <tr>
    319. 

  319.     <td><a href="command-line-options.php#log">-log <var>format</var></a></td>
    320. 

  320.     <td>format of debugging information</td>
    321. 

  321.   </tr>
    322. 

  322. 

  323.   <tr>
    324. 

  324.     <td><a href="command-line-options.php#mask">-mask <var>filename</var></a></td>
    325. 

  325.     <td>associate a mask with the image</td>
    326. 

  326.   </tr>
    327. 

  327. 

  328.   <tr>
    329. 

  329.     <td><a href="command-line-options.php#moments">-moments</a></td>
    330. 

  330.     <td>display image moments and perceptual hash.</td>
    331. 

  331.   </tr>
    332. 

  332. 

  333.   <tr>
    334. 

  334.     <td><a href="command-line-options.php#monitor">-monitor</a></td>
    335. 

  335.     <td>monitor progress</td>
    336. 

  336.   </tr>
    337. 

  337. 

  338.   <tr>
    339. 

  339.     <td><a href="command-line-options.php#negate">-negate</a></td>
    340. 

  340.     <td>replace each pixel with its complementary color </td>
    341. 

  341.   </tr>
    342. 

  342. 

  343.   <tr>
    344. 

  344.     <td><a href="command-line-options.php#precision">-precision <var>value</var></a></td>
    345. 

  345.     <td>set the maximum number of significant digits to be printed</td>
    346. 

  346.   </tr>
    347. 

  347. 

  348.   <tr>
    349. 

  349.     <td><a href="command-line-options.php#quiet">-quiet</a></td>
    350. 

  350.     <td>suppress all warning messages</td>
    351. 

  351.   </tr>
    352. 

  352. 

  353.   <tr>
    354. 

  354.     <td><a href="command-line-options.php#regard-warnings">-regard-warnings</a></td>
    355. 

  355.     <td>pay attention to warning messages.</td>
    356. 

  356.   </tr>
    357. 

  357. 

  358.   <tr>
    359. 

  359.     <td><a href="command-line-options.php#respect-parentheses">-respect-parentheses</a></td>
    360. 

  360.     <td>settings remain in effect until parenthesis boundary.</td>
    361. 

  361.   </tr>
    362. 

  362. 

  363.   <tr>
    364. 

  364.     <td><a href="command-line-options.php#sampling-factor">-sampling-factor <var>geometry</var></a></td>
    365. 

  365.     <td>horizontal and vertical sampling factor</td>
    366. 

  366.   </tr>
    367. 

  367. 

  368.   <tr>
    369. 

  369.     <td><a href="command-line-options.php#set">-set <var>attribute value</var></a></td>
    370. 

  370.     <td>set an image attribute</td>
    371. 

  371.   </tr>
    372. 

  372. 

  373.   <tr>
    374. 

  374.     <td><a href="command-line-options.php#size">-size <var>geometry</var></a></td>
    375. 

  375.     <td>width and height of image</td>
    376. 

  376.   </tr>
    377. 

  377. 

  378.   <tr>
    379. 

  379.     <td><a href="command-line-options.php#strip">-strip</a></td>
    380. 

  380.     <td>strip image of all profiles and comments</td>
    381. 

  381.   </tr>
    382. 

  382. 

  383.   <tr>
    384. 

  384.     <td><a href="command-line-options.php#unique">-unique</a></td>
    385. 

  385.     <td>display image the number of unique colors in the image.</td>
    386. 

  386.   </tr>
    387. 

  387. 

  388.   <tr>
    389. 

  389.     <td><a href="command-line-options.php#units">-units <var>type</var></a></td>
    390. 

  390.     <td>the units of image resolution</td>
    391. 

  391.   </tr>
    392. 

  392. 

  393.   <tr>
    394. 

  394.     <td><a href="command-line-options.php#verbose">-verbose</a></td>
    395. 

  395.     <td>print detailed information about the image</td>
    396. 

  396.   </tr>
    397. 

  397. 

  398.   <tr>
    399. 

  399.     <td><a href="command-line-options.php#version">-version</a></td>
    400. 

  400.     <td>print version information</td>
    401. 

  401.   </tr>
    402. 

  402. 

  403.   <tr>
    404. 

  404.     <td><a href="command-line-options.php#virtual-pixel">-virtual-pixel <var>method</var></a></td>
    405. 

  405.     <td>access method for pixels outside the boundaries of the image</td>
    406. 

  406.   </tr>
    407. 

  407. 

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