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483 lines
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<main class="container">
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<h1 class="text-center">Image Format and Characteristics</h1>
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<p class="text-center"><a href="identify.html#usage">Example Usage</a> • <a href="identify.html#options">Option Summary</a></p>
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<p class="lead magick-description">The <code>magick 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="../www/command-line-processing.html">Command Line Processing</a> for advice on how to structure your <code>magick identify</code> command or see below for example usages of the command.</p>
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<h2><a class="anchor" id="usage"></a>Example Usage</h2>
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<p>We list a few examples of the <code>magick identify</code> command here to illustrate its usefulness and ease of use. To get started, lets identify an image in the JPEG format:</p>
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<pre class="highlight"><code>-> magick identify rose.jpg
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rose.jpg JPEG 70x46 70x46+0+0 8-bit sRGB 2.36KB 0.000u 0:00.000
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</code></pre>
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<p>By default, <code>magick identify</code> provides the following output:</p>
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<ul><code>Filename[frame #] image-format widthxheight page-widthxpage-height+x-offset+y-offset colorspace user-time elapsed-time</code></ul>
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<p>Next, we look at the same image in greater detail:</p>
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<pre class="pre-scrollable highlight"><code>-> magick identify -verbose rose.jpg
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Image: rose.jpg
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Format: JPEG (Joint Photographic Experts Group JFIF format)
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Mime type: images/jpeg
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Class: DirectClass
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Geometry: 70x46+0+0
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Units: Undefined
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Type: TrueColor
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Endianness: Undefined
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Colorspace: sRGB
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Depth: 8-bit
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Channel depth:
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Red: 8-bit
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Green: 8-bit
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Blue: 8-bit
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Channel statistics:
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Pixels: 3220
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Red:
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min: 31 (0.121569)
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max: 255 (1)
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mean: 145.557 (0.570814)
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standard deviation: 69.1933 (0.271346)
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kurtosis: -1.38945
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skewness: 0.138955
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entropy: 0.970683
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Green:
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min: 27 (0.105882)
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max: 255 (1)
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mean: 89.246 (0.349984)
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standard deviation: 52.4608 (0.205729)
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kurtosis: 2.60139
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skewness: 1.80708
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entropy: 0.869711
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Blue:
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min: 21 (0.0823529)
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max: 255 (1)
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mean: 80.4196 (0.315371)
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standard deviation: 54.9377 (0.215442)
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kurtosis: 2.93417
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skewness: 1.95544
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entropy: 0.853176
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Image statistics:
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Overall:
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min: 21 (0.0823529)
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max: 255 (1)
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mean: 105.074 (0.412056)
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standard deviation: 58.8639 (0.230839)
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kurtosis: 1.37788
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skewness: 1.48073
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entropy: 0.897856
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Rendering intent: Perceptual
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Gamma: 0.454545
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Chromaticity:
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red primary: (0.64,0.33)
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green primary: (0.3,0.6)
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blue primary: (0.15,0.06)
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white point: (0.3127,0.329)
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Alpha color: grey74
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Background color: white
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Border color: srgb(223,223,223)
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Transparent color: none
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Interlace: None
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Intensity: Undefined
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Compose: Over
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Page geometry: 70x46+0+0
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Dispose: Undefined
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Iterations: 0
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Compression: JPEG
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Quality: 92
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Orientation: Undefined
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Properties:
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jpeg:colorspace: 2
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jpeg:sampling-factor: 1x1,1x1,1x1
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signature: aea65c9b557d779d142f26d04abe7008bab50f1e9647faae20afdcc6c15140d5
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Artifacts:
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verbose: true
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Tainted: False
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Filesize: 2.65KB
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Number pixels: 3.22K
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User time: 0.000u
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Elapsed time: 0:01.000
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Version: ImageMagick 7.0.4-8 Q16 x86_64 http://imagemagick.org
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</code></pre>
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<p>Note, the image signature is generated from the pixel components, not the image metadata.</p>
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<p>To get the print size in inches of an image at 72 DPI, use:</p>
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<pre class="highlight"><code>-> magick identify -format "%[fx:w/72] by %[fx:h/72] inches" document.png
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8.5 x 11 inches
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</code></pre>
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<p>The depth and dimensions of a raw image must be specified on the command line:</p>
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<pre class="highlight"><code>-> magick identify -depth 8 -size 640x480 image.raw
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image.raw RGB 640x480 sRGB 9kb 0.000u 0:01
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</code></pre>
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<p>Here we display the image texture features, moments, perceptual hash, and the number of unique colors in the image:</p>
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<pre class="highlight"><code>-> magick identify -verbose -features 1 -moments -unique image.png</code></pre>
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<p>To display the convex hull and minimum bounding box attributes of the image, use:</p>
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<pre class="highlight"><code>magick identify -define identify:convex-hull=true image.png</code></pre>
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<p>Here is a special define that outputs the location of the minimum or maximum pixel of the image:</p>
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<pre class="highlight"><code>magick identify -precision 5 -define identify:locate=maximum -define identify:limit=3 image.png</code></pre>
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<p>You can find additional examples of using <code>magick identify</code> in <a href="https://legacy.imagemagick.org/Usage/">Examples of ImageMagick Usage</a>.</p>
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<h2><a class="anchor" id="options"></a>Option Summary</h2>
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<p>The <code>magick identify</code> command recognizes these options. Click on an option to get more details about how that option works.</p>
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<table class="table table-sm table-hover">
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<tbody>
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<tr>
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<th align="left">Option</th>
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<th align="left">Description</th>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#alpha">-alpha</a></td>
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<td>on, activate, off, deactivate, set, opaque, copy",
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transparent, extract, background, or shape the alpha channel</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#antialias">-antialias</a></td>
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<td>remove pixel-aliasing</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#authenticate">-authenticate <var>value</var></a></td>
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<td>decrypt image with this password</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#channel">-channel <var>type</var></a></td>
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<td>apply option to select image channels</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#clip">-clip</a></td>
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<td>clip along the first path from the 8BIM profile</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#clip-mask">-clip-mask</a> <var>filename</var></td>
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<td>associate clip mask with the image</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#clip-path">-clip-path <var>id</var></a></td>
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<td>clip along a named path from the 8BIM profile</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#colorspace">-colorspace <var>type</var></a></td>
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<td>set image colorspace</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#crop">-crop <var>geometry</var></a></td>
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<td>crop the image</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#debug">-debug <var>events</var></a></td>
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<td>display copious debugging information</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#define">-define <var>format:option</var></a></td>
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<td>define one or more image format options</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#density">-density <var>geometry</var></a></td>
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<td>horizontal and vertical density of the image</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#depth">-depth <var>value</var></a></td>
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<td>image depth</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#endian">-endian <var>type</var></a></td>
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<td>endianness (MSB or LSB) of the image</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#extract">-extract <var>geometry</var></a></td>
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<td>extract area from image</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#features">-features <var>distance</var></a></td>
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<td>analyze image features (e.g. contract, correlations, etc.).</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#format_identify_">-format <var>string</var></a></td>
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<td>output formatted image characteristics</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#gamma">-gamma <var>value</var></a></td>
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<td>level of gamma correction</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#grayscale">-grayscale <var>method</var></a></td>
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<td>convert image to grayscale</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#help">-help</a></td>
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<td>print program options</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#interlace">-interlace <var>type</var></a></td>
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<td>type of image interlacing scheme</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#interpolate">-interpolate <var>method</var></a></td>
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<td>pixel color interpolation method</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#limit">-limit <var>type value</var></a></td>
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<td>pixel cache resource limit</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#list">-list <var>type</var></a></td>
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<td>Color, Configure, Delegate, Format, Magic, Module, Resource, or Type</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#log">-log <var>format</var></a></td>
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<td>format of debugging information</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#mask">-mask <var>filename</var></a></td>
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<td>associate a mask with the image</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#moments">-moments</a></td>
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<td>display image moments and perceptual hash.</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#monitor">-monitor</a></td>
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<td>monitor progress</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#negate">-negate</a></td>
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<td>replace each pixel with its complementary color </td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#ping">-ping</a></td>
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<td>by default, efficiently determine certain image characteristics.</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#precision">-precision <var>value</var></a></td>
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<td>set the maximum number of significant digits to be printed</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#quiet">-quiet</a></td>
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<td>suppress all warning messages</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#regard-warnings">-regard-warnings</a></td>
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<td>pay attention to warning messages.</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#respect-parentheses">-respect-parentheses</a></td>
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<td>settings remain in effect until parenthesis boundary.</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#sampling-factor">-sampling-factor <var>geometry</var></a></td>
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<td>horizontal and vertical sampling factor</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#set">-set <var>attribute value</var></a></td>
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<td>set an image attribute</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#size">-size <var>geometry</var></a></td>
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<td>width and height of image</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#strip">-strip</a></td>
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<td>strip image of all profiles and comments</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#unique">-unique</a></td>
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<td>display image the number of unique colors in the image.</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#units">-units <var>type</var></a></td>
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<td>the units of image resolution</td>
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</tr>
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<tr>
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<td><a href="../www/command-line-options.html#verbose">-verbose</a></td>
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<td>print detailed information about the image</td>
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<td><a href="../www/command-line-options.html#version">-version</a></td>
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<td>print version information</td>
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<tr>
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<td><a href="../www/command-line-options.html#virtual-pixel">-virtual-pixel <var>method</var></a></td>
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<td>access method for pixels outside the boundaries of the image</td>
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