GraphicsMagick GM Utility

gm identify
NAME
| identify - describe an image or image sequence.
Contents
| Synopsis Description Options Authors Copyright
Synopsis
| identify file [ file ... ]
Description
| Identify describes the format and characteristics of one or more image files. It will also report if an image is incomplete or corrupt. The information displayed includes the scene 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 in both user time and elapsed time it took to read and process the image. If -verbose or +ping are provided as an option, the pixel read rate is also displayed. An example line output from identify follows:
        images/aquarium.miff 640x480 PseudoClass 256c
               308135b MIFF 0.000u 0:01
If `-verbose` is set, expect additional output including any image comment:
        Image: images/aquarium.miff
        class: PseudoClass
        colors: 256
        signature: eb5dca81dd93ae7e6ffae99a527eb5dca8...
        matte: False
        geometry: 640x480
           depth: 8
        bytes: 308135
        format: MIFF
        comments:
        Imported from MTV raster image: aquarium.mtv
For some formats, additional format-specific information about the file will be written if the `-debug coder` or `-debug all` option is used.
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Options
Identify options
| Options are processed in command line order. Any option you specify on the command line remains in effect for the set of images immediately following, until the set is terminated by the appearance of any option or -noop. For a more detailed description of each option, see Options, above. GraphicsMagick(1).
| -authenticate <string>
| decrypt image with this password
| -debug <events>
| enable debug printout
| -define <key>{=<value>},...
| add coder/decoder specific options
| -density <width>x<height>
| horizontal and vertical resolution in pixels of the image
| -depth <value>
| depth of the image
| -format <string>
| output formatted image characteristics
| -help
| print usage instructions
| -interlace <type>
| the type of interlacing scheme
| -limit <type> <value>
| Disk, File, Map, Memory, or Pixels resource limit
| -log <string>
| Specify format for debug log
| -ping
| efficiently determine image characteristics
| -sampling-factor <horizontal_factor>x<vertical_factor>
| chroma subsampling factors
| -size <width>x<height>{+offset}
| width and height of the image
| -verbose
| print detailed information about the image
| -version
| print GraphicsMagick version string
For a more detailed description of each option, see Options, above. GraphicsMagick(1).
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Authors
| John Cristy, Bob Friesenhahn, Glenn Randers-Pehrson, William Radcliff, Leonard Rosenthol.
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Copyright
| Copyright (C) 2002 - 2009 GraphicsMagick Group, an organization dedicated to making software imaging solutions freely available. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files ("GraphicsMagick"), to deal in GraphicsMagick without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of GraphicsMagick, and to permit persons to whom GraphicsMagick is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of GraphicsMagick. The software is provided "as is", without warranty of any kind, express or implied, including but not limited to the warranties of merchantability, fitness for a particular purpose and noninfringement. In no event shall GraphicsMagick Group be liable for any claim, damages or other liability, whether in an action of contract, tort or otherwise, arising from, out of or in connection with GraphicsMagick or the use or other dealings in GraphicsMagick. Except as contained in this notice, the name of the GraphicsMagick Group shall not be used in advertising or otherwise to promote the sale, use or other dealings in GraphicsMagick without prior written authorization from the GraphicsMagick Group. Additional copyrights and licenses apply to this software. You should have received a copy of Copyright.txt with this package, which describes additional copyrights and licenses which apply to this software; otherwise see http://www.graphicsmagick.org/www/Copyright.html.
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