ImageMagick Identify Command-line Tool

+

-

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.

+

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

+

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

+

$ 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
+

$ identify -verbose rose.jpgImage: rose.jpg
Format: JPEG (Joint Photographic Experts Group JFIF format)
Class: DirectClass
Geometry: 70x46+0+0
@@ -237,21 +307,21 @@ Tainted: False
Filesize: 3.97266kb
Number pixels: 3.14453kb
- Version: ImageMagick 6.6.5-0 2010-00-00 Q16 http://www.imagemagick.org

+ Version: ImageMagick 6.7.7-5 2012-05-18 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

+

$ 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

+

$ 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

+

$ identify -verbose -features 1 -unique image.png

You can find additional examples of using identify in Examples of ImageMagick Usage.

-

Option Summary

+

Option Summary

The identify command recognizes these options. Click on an option to get more details about how that option works.

@@ -264,173 +334,173 @@ - -alpha + -alpha on, activate, off, deactivate, set, opaque, copy", transparent, extract, background, or shape the alpha channel - -antialias + -antialias remove pixel-aliasing - -authenticate value + -authenticate value decrypt image with this password - -channel type + -channel type apply option to select image channels - -colorspace type + -colorspace type set image colorspace - -crop geometry + -crop geometry crop the image - -debug events + -debug events display copious debugging information - -define format:option + -define format:option define one or more image format options - -density geometry + -density geometry horizontal and vertical density of the image - -depth value + -depth value image depth - -extract geometry + -extract geometry extract area from image - -features distance + -features distance display image features (e.g. contract, correlations, etc.). - -format string + -format string output formatted image characteristics - -gamma value + -gamma value level of gamma correction - -help + -help print program options - -interlace type + -interlace type type of image interlacing scheme - -interpolate method + -interpolate method pixel color interpolation method - -limit type value + -limit type value pixel cache resource limit - -list type + -list type Color, Configure, Delegate, Format, Magic, Module, Resource, or Type - -log format + -log format format of debugging information - -monitor + -monitor monitor progress - -negate + -negate replace each pixel with its complementary color - -quiet + -quiet suppress all warning messages - -regard-warnings + -regard-warnings pay attention to warning messages. - -respect-parentheses + -respect-parentheses settings remain in effect until parenthesis boundary. - -sampling-factor geometry + -sampling-factor geometry horizontal and vertical sampling factor - -set attribute value + -set attribute value set an image attribute - -size geometry + -size geometry width and height of image - -strip + -strip strip image of all profiles and comments - -unique + -unique display image the number of unique colors in the image. - -units type + -units type the units of image resolution - -verbose + -verbose print detailed information about the image - -version + -version print version information - -virtual-pixel method + -virtual-pixel method access method for pixels outside the boundaries of the image @@ -444,14 +514,14 @@ transparent, extract, background, or shape the alpha channel

- Discourse Server • + Discourse Server • Studio