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  <title>ImageMagick: Command-line Tools: Identify</title>
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<p class="navigation-index">[<a href="#usage">Example Usage</a> | <a href="#options">Option Summary</a>]</p>

<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>

<div style="margin: auto;">
  <h2><a name="usage"></a>Example Usage</h2>
</div>

<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>

<pre class="text">
  identify rose.jpg
  rose.jpg JPEG 640x480 DirectClass 87kb 0.050u 0:01
</pre>

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

<pre class="text">
  identify -verbose rose.jpg
  Image: rose.jpg
    Format: JPEG (Joint Photographic Experts Group JFIF format)
    Geometry: 640x480
    Class: DirectClass
    Type: TrueColor
    Endianess: Undefined
    Colorspace: RGB
    Depth: 8 bits
    Channel depth:
      Red: 8-bits
      Green: 8-bits
      Blue: 8-bits
    Channel statistics:
      Red:
        Min: 0 (0)
        Max: 255 (1)
        Mean: 228.152 (0.894713)
        Standard deviation: 70.3632 (0.275934)
      Green:
        Min: 1 (0.00392157)
        Max: 255 (1)
        Mean: 229.041 (0.898198)
        Standard deviation: 62.6714 (0.24577)
      Blue:
        Min: 0 (0)
        Max: 255 (1)
        Mean: 232.299 (0.910975)
        Standard deviation: 55.2762 (0.216769)
    Colors: 12314
    Rendering-intent: Undefined
    Resolution: 72x72
    Units: PixelsPerInch
    Filesize: 87kb
    Interlace: None
    Background Color: white
    Border Color: #DFDFDF
    Matte Color: grey74
    Dispose: Undefined
    Iterations: 0
    Compression: JPEG
    Quality: 100
    Orientation: Undefined
    JPEG-Colorspace: 2
    JPEG-Sampling-factors: 2x2,1x1,1x1
    Signature: e20b287cfed4f152572bdfb89f7f5f677d869c504620e8b1a9b3aa1d9d834785
    Tainted: False
    User Time: 0.040u
    Elapsed Time: 0:01
    Version: ImageMagick 6.2.0 02/20/05 Q16 http://www.imagemagick.org
</pre>

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

<pre class="text">
  identify -depth 8 -size 640x480 image.raw
  rose.rgb RGB 70x46 DirectClass 9kb 0.000u 0:01
</pre>

<p>You can find additional examples of using <kbd>identify</kbd> in <a href="http://www-106.ibm.com/developerworks/library/l-graf/?ca=dnt-428" target="1974316459">Graphics from the Command Line</a>.  Further discussion is available in <a href="http://www-106.ibm.com/developerworks/library/l-graf2/?ca=dgr-lnxw15GraphicsLine" target="521920159">More Graphics from the Command Line</a> and <a href="http://www.cit.gu.edu.au/~anthony/graphics/imagick6" target="839799672">Examples of ImageMagick Usage</a>.</p>

<div style="margin: auto;">
  <h2><a name="options"></a>Option Summary</h2>
</div>

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

<table style="width: 100%" id="table" cellpadding="2" cellspacing="0">
  <tbody>
  <tr>
    <th align="left">Option</th>
    <th align="left">Description</th>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#authenticate" target="magick-options">-authenticate <em class="option">value</em></a></td>
    <td>decrypt image with this password</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#channel" target="magick-options">-channel <em class="option">type</em></a></td>
    <td>apply option to select image channels</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#crop" target="magick-options">-crop <em class="option">geometry</em></a></td>
    <td>crop the image</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#debug" target="magick-options">-debug <em class="option">events</em></a></td>
    <td>display copious debugging information</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#define" target="magick-options">-define <em class="option">format:option</em></a></td>
    <td>define one or more image format options</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#density" target="magick-options">-density <em class="option">geometry</em></a></td>
    <td>horizontal and vertical density of the image</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#depth" target="magick-options">-depth <em class="option">value</em></a></td>
    <td>image depth</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#extract" target="magick-options">-extract <em class="option">geometry</em></a></td>
    <td>extract area from image</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#format" target="magick-options">-format <em class="option">string</em></a></td>
    <td>output formatted image characteristics</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#help" target="magick-options">-help</a></td>
    <td>print program options</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#interlace" target="magick-options">-interlace <em class="option">type</em></a></td>
    <td>type of image interlacing scheme</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#limit" target="magick-options">-limit <em class="option">type value</em></a></td>
    <td>pixel cache resource limit</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#list" target="magick-options">-list <em class="option">type</em></a></td>
    <td>Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#log" target="magick-options">-log <em class="option">format</em></a></td>
    <td>format of debugging information</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#matte" target="magick-options">-matte</a></td>
    <td>store matte channel if the image has one</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#monitor" target="magick-options">-monitor</a></td>
    <td>monitor progress</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#quiet" target="magick-options">-quiet</a></td>
    <td>suppress all error or warning messages</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#sampling-factor" target="magick-options">-sampling-factor <em class="option">geometry</em></a></td>
    <td>horizontal and vertical sampling factor</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#set" target="magick-options">-set <em class="option">attribute value</em></a></td>
    <td>set an image attribute</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#size" target="magick-options">-size <em class="option">geometry</em></a></td>
    <td>width and height of image</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#strip" target="magick-options">-strip</a></td>
    <td>strip image of all profiles and comments</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#units" target="magick-options">-units <em class="option">type</em></a></td>
    <td>the units of image resolution</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#verbose" target="magick-options">-verbose</a></td>
    <td>print detailed information about the image</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#version" target="magick-options">-version</a></td>
    <td>print version information</td>
  </tr>

<tr>
    <td><a href="../www/command-line-options.html#virtual-pixel" target="magick-options">-virtual-pixel <em class="option">method</em></a></td>
    <td>access method for pixels outside the boundaries of the image</td>
  </tr>

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