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The identify 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 Command Line Processing for advice on how to structure your identify command or see below for example usages of the command.
Example Usage
We list a few examples of the identify command here to illustrate its usefulness and ease of use. To get started, lets identify an image in the JPEG format:
$magick> identify rose.jpg rose.jpg JPEG 640x480 DirectClass 87kb 0.050u 0:01
Next, we look at the same image in greater detail:
$magick> identify -verbose rose.jpgImage: 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:
date:create: 2008-01-08T11:08:52-05:00
date:modify: 2005-04-07T12:48:13-04:00
jpeg:colorspace: 2
jpeg:sampling-factor: 2x2,1x1,1x1
signature: dcd00d6303f80f4fa53f991804cb026151c1e851b7a96255e82da87299583ebc
Artifacts:
verbose: true
Tainted: False
Filesize: 3.97266kb
Number pixels: 3.14453kb
Version: ImageMagick 6.6.0-0 2010-02-21 Q16 http://www.imagemagick.org
To get the print size in inches of an image at 72 DPI, use:
$magick> identify -format "%[fx:w/72] by %[fx:h/72] inches" document.png8.5 x 11 inches
The depth and dimensions of a raw image must be specified on the command line:
$magick> identify -depth 8 -size 640x480 image.rawimage.raw RGB 640x480 DirectClass 9kb 0.000u 0:01
Here we display the image texture features and the number of unique colors in the image:
$magick> identify -verbose -features 1 -unique image.png
You can find additional examples of using identify in Examples of ImageMagick Usage.
Option Summary
The identify command recognizes these options. Click on an option to get more details about how that option works.
| Option | Description |
|---|---|
| -alpha | on, activate, off, deactivate, set, opaque, copy", transparent, extract, background, or shape the alpha channel |
| -antialias | remove pixel-aliasing |
| -authenticate value | decrypt image with this password |
| -channel type | apply option to select image channels |
| -colorspace type | set image colorspace |
| -crop geometry | crop the image |
| -debug events | display copious debugging information |
| -define format:option | define one or more image format options |
| -density geometry | horizontal and vertical density of the image |
| -depth value | image depth |
| -extract geometry | extract area from image |
| -features distance | display image features (e.g. contract, correlations, etc.). |
| -format string | output formatted image characteristics |
| -gamma value | level of gamma correction |
| -help | print program options |
| -interlace type | type of image interlacing scheme |
| -interpolate method | pixel color interpolation method |
| -limit type value | pixel cache resource limit |
| -list type | Color, Configure, Delegate, Format, Magic, Module, Resource, or Type |
| -log format | format of debugging information |
| -monitor | monitor progress |
| -negate | replace each pixel with its complementary color |
| -quiet | suppress all warning messages |
| -regard-warnings | pay attention to warning messages. |
| -respect-parentheses | settings remain in effect until parenthesis boundary. |
| -sampling-factor geometry | horizontal and vertical sampling factor |
| -set attribute value | set an image attribute |
| -size geometry | width and height of image |
| -strip | strip image of all profiles and comments |
| -unique | display image the number of unique colors in the image. |
| -units type | the units of image resolution |
| -verbose | print detailed information about the image |
| -version | print version information |
| -virtual-pixel method | access method for pixels outside the boundaries of the image |