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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)
Class: DirectClass
Geometry: 70x46+0+0
Resolution: 72x72
Print size: 0.972222x0.638889
Units: PixelsPerInch
Type: TrueColor
Endianess: Undefined
Colorspace: RGB
Depth: 8-bit
Channel depth:
red: 8-bit
green: 8-bit
blue: 8-bit
Channel statistics:
red:
min: 37 (0.145098)
max: 255 (1)
mean: 145.58 (0.5709)
standard deviation: 67.3195 (0.263998)
green:
min: 31 (0.121569)
max: 255 (1)
mean: 89.2512 (0.350005)
standard deviation: 52.0488 (0.204113)
blue:
min: 17 (0.0666667)
max: 255 (1)
mean: 80.4075 (0.315323)
standard deviation: 54.0052 (0.211785)
Rendering intent: Undefined
Interlace: None
Background color: white
Border color: rgb(223,223,223)
Matte color: grey74
Transparent color: black
Page geometry: 70x46+0+0
Dispose: Undefined
Iterations: 0
Compression: JPEG
Quality: 100
Orientation: Undefined
Properties:
create-date: 2008-01-08T11:08:52-05:00
jpeg:colorspace: 2
jpeg:sampling-factor: 2x2,1x1,1x1
modify-date: 2005-04-07T12:48:13-04:00
signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc
Artifacts:
verbose: true
Tainted: False
Filesize: 3.97266kb
Number pixels: 3.14453kb
Version: ImageMagick 6.4.9 2009-01-01 Q16 http://www.imagemagick.org
</pre>
<p>To get the print size in inches of an image at 72 DPI, use:</p>
<pre class="text">
identify -format "%[fx:w/72] by %[fx:h/72] inches" document.png
8.5 x 11 inches
</pre>
<p>The depth and dimensions of a raw image must be specified on the command line:</p>
<pre class="text">
identify -depth 8 -size 640x480 image.raw
image.raw RGB 640x480 DirectClass 9kb 0.000u 0:01
</pre>
<p>Here we display the number of unique colors in the image:</p>
<pre class="text">
identify -define unique=true -verbose image.png
</pre>
<p>You can find additional examples of using <kbd>identify</kbd> in <a href="http://www.imagemagick.org/Usage/" target="17859650">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 id="table" cellpadding="2" cellspacing="0" style="width: 93%">
<tbody>
<tr>
<th align="left">Option</th>
<th align="left">Description</th>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#alpha" target="magick-options">-alpha</a></td>
<td valign="top">activate, deactivate, reset, or set the alpha channel</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#antialias" target="magick-options">-antialias</a></td>
<td valign="top">remove pixel-aliasing</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#authenticate" target="magick-options">-authenticate <em class="option">value</em></a></td>
<td valign="top">decrypt image with this password</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#channel" target="magick-options">-channel <em class="option">type</em></a></td>
<td valign="top">apply option to select image channels</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#colorspace" target="magick-options">-colorspace <em class="option">type</em></a></td>
<td valign="top">set image colorspace</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#crop" target="magick-options">-crop <em class="option">geometry</em></a></td>
<td valign="top">crop the image</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#debug" target="magick-options">-debug <em class="option">events</em></a></td>
<td valign="top">display copious debugging information</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#define" target="magick-options">-define <em class="option">format:option</em></a></td>
<td valign="top">define one or more image format options</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#density" target="magick-options">-density <em class="option">geometry</em></a></td>
<td valign="top">horizontal and vertical density of the image</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#depth" target="magick-options">-depth <em class="option">value</em></a></td>
<td valign="top">image depth</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#extract" target="magick-options">-extract <em class="option">geometry</em></a></td>
<td valign="top">extract area from image</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#format" target="magick-options">-format <em class="option">string</em></a></td>
<td valign="top">output formatted image characteristics</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#gamma" target="magick-options">-gamma <em class="option">value</em></a></td>
<td valign="top">level of gamma correction</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#help" target="magick-options">-help</a></td>
<td valign="top">print program options</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#interlace" target="magick-options">-interlace <em class="option">type</em></a></td>
<td valign="top">type of image interlacing scheme</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#interpolate">-interpolate <em class="option">method</em></a></td>
<td valign="top">pixel color interpolation method</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#limit" target="magick-options">-limit <em class="option">type value</em></a></td>
<td valign="top">pixel cache resource limit</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#list" target="magick-options">-list <em class="option">type</em></a></td>
<td valign="top">Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#log" target="magick-options">-log <em class="option">format</em></a></td>
<td valign="top">format of debugging information</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#monitor" target="magick-options">-monitor</a></td>
<td valign="top">monitor progress</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#quiet" target="magick-options">-quiet</a></td>
<td valign="top">suppress all warning messages</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#regard-warnings" target="magick-options">-regard-warnings</a></td>
<td valign="top">pay attention to warning messages.</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#respect-parenthesis" target="magick-options">-respect-parenthesis</a></td>
<td valign="top">settings remain in effect until parenthesis boundary.</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#sampling-factor" target="magick-options">-sampling-factor <em class="option">geometry</em></a></td>
<td valign="top">horizontal and vertical sampling factor</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#set" target="magick-options">-set <em class="option">attribute value</em></a></td>
<td valign="top">set an image attribute</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#size" target="magick-options">-size <em class="option">geometry</em></a></td>
<td valign="top">width and height of image</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#strip" target="magick-options">-strip</a></td>
<td valign="top">strip image of all profiles and comments</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#units" target="magick-options">-units <em class="option">type</em></a></td>
<td valign="top">the units of image resolution</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#verbose" target="magick-options">-verbose</a></td>
<td valign="top">print detailed information about the image</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#version" target="magick-options">-version</a></td>
<td valign="top">print version information</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#virtual-pixel" target="magick-options">-virtual-pixel <em class="option">method</em></a></td>
<td valign="top">access method for pixels outside the boundaries of the image</td>
</tr>
</tbody>
</table>
<p>To return the number of unique colors in your image, add <a href="../www/command-line-options.html#define" target="magick-options">-define identify:unique=true</a> to your command-line</p>
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