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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>
<div class="doc-section">
<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>
<h2><a name="usage"></a>Example Usage</h2>
<div class="doc-section">
<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>
<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>identify rose.jpg</span><span class='crtout'> rose.jpg JPEG 640x480 DirectClass 87kb 0.050u 0:01</span></p>
<p>Next, we look at the same image in greater detail:</p>
<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>identify -verbose rose.jpg</span><span class='crtout'>Image: rose.jpg <br/>
Format: JPEG (Joint Photographic Experts Group JFIF format) <br/>
Class: DirectClass <br/>
Geometry: 70x46+0+0 <br/>
Resolution: 72x72 <br/>
Print size: 0.972222x0.638889 <br/>
Units: PixelsPerInch <br/>
Type: TrueColor <br/>
Endianess: Undefined <br/>
Colorspace: RGB <br/>
Depth: 8-bit <br/>
Channel depth: <br/>
red: 8-bit <br/>
green: 8-bit <br/>
blue: 8-bit <br/>
Channel statistics: <br/>
red: <br/>
min: 37 (0.145098) <br/>
max: 255 (1) <br/>
mean: 145.58 (0.5709) <br/>
standard deviation: 67.3195 (0.263998) <br/>
green: <br/>
min: 31 (0.121569) <br/>
max: 255 (1) <br/>
mean: 89.2512 (0.350005) <br/>
standard deviation: 52.0488 (0.204113) <br/>
blue: <br/>
min: 17 (0.0666667) <br/>
max: 255 (1) <br/>
mean: 80.4075 (0.315323) <br/>
standard deviation: 54.0052 (0.211785) <br/>
Rendering intent: Undefined <br/>
Interlace: None <br/>
Background color: white <br/>
Border color: rgb(223,223,223) <br/>
Matte color: grey74 <br/>
Transparent color: black <br/>
Page geometry: 70x46+0+0 <br/>
Dispose: Undefined <br/>
Iterations: 0 <br/>
Compression: JPEG <br/>
Quality: 100 <br/>
Orientation: Undefined <br/>
Properties: <br/>
date:create: 2008-01-08T11:08:52-05:00 <br/>
date:modify: 2005-04-07T12:48:13-04:00 <br/>
jpeg:colorspace: 2 <br/>
jpeg:sampling-factor: 2x2,1x1,1x1 <br/>
signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc <br/>
Artifacts: <br/>
verbose: true <br/>
Tainted: False <br/>
Filesize: 3.97266kb <br/>
Number pixels: 3.14453kb <br/>
Version: ImageMagick 6.6.1-4 2010-04-15 Q16 http://www.imagemagick.org</span></p>
<p>To get the print size in inches of an image at 72 DPI, use:</p>
<p class='crt'><span class="crtprompt"> $magick> </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>
<p>The depth and dimensions of a raw image must be specified on the command line:</p>
<p class='crt'><span class="crtprompt"> $magick> </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>
<p>Here we display the image texture features and the number of unique colors in the image:</p>
<p class='crt'><span class="crtprompt"> $magick> </span><span class='crtin'>identify -verbose -features 1 -unique image.png</span></p>
<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>
</div>
<h2><a name="options"></a>Option Summary</h2>
<div class="doc-section">
<p>The <kbd>identify</kbd> command recognizes these options. Click on an option to get more details about how that option works.</p>
<table class="doc">
<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">-alpha</a></td>
<td valign="top">on, activate, off, deactivate, set, opaque, copy",
transparent, extract, background, or shape the alpha channel</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#antialias">-antialias</a></td>
<td valign="top">remove pixel-aliasing</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#authenticate">-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">-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">-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">-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">-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">-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">-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">-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">-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#features">-features <em class="option">distance</em></a></td>
<td valign="top">display image features (e.g. contract, correlations, etc.).</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#format_identify_">-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">-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">-help</a></td>
<td valign="top">print program options</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#interlace">-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">-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">-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">-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">-monitor</a></td>
<td valign="top">monitor progress</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#negate">-negate</a></td>
<td valign="top">replace each pixel with its complementary color </td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#quiet">-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">-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-parentheses">-respect-parentheses</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">-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">-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">-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">-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#unique">-unique</a></td>
<td valign="top">display image the number of unique colors in the image.</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#units">-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">-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">-version</a></td>
<td valign="top">print version information</td>
</tr>
<tr>
<td valign="top"><a href="../www/command-line-options.html#virtual-pixel">-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>
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