identify(1)identify(1)NAMEidentify - describe the format and characteristics of one or more image
SYNOPSISidentify [ options ... ] file [ file ... ]
DESCRIPTIONidentify 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 it took to read and process the image. An example line output
from identify follows:
images/aquarium.miff 640x480 PseudoClass 256c 308135b MIFF 1s
If -verbose is set, expect additional output including any image com‐
Imported from MTV raster image: aquarium.mtv
megabytes of memory available to the pixel cache.
Image pixels are stored in memory until 80 megabytes of memory
have been consumed. Subsequent pixel operations are cached on
disk. Operations to memory are significantly faster but if your
computer does not have a sufficient amount of free memory you
may want to adjust this threshold value.
vertical and horizontal resolution in pixels of the image.
This option specifies an image density when decoding a Post‐
script or Portable Document page. The default is 72 pixels per
inch in the horizontal and vertical direction. This option is
used in concert with -page.
output formatted image characteristics.
Use this option to print information about the image in a format
of your choosing. You can include the image filename, type,
width, height, or other image attributes by embedding special
%b file size
%e filename extention
%i input filename
%n number of scenes
%o output filename
%p page number
%q quantum depth
%s scene number
%t top of filename
%u unique temporary filename
%x x resolution
%y y resolution
\r carriage return
-format "%m:%f %wx%h"
displays MIFF:bird.miff 512x480 for an image titled bird.miff
and whose width is 512 and height is 480.
If the first character of string is @, the image comment is read
from a file titled by the remaining characters in the string.
-ping efficiently determine image characteristics.
This is a more efficient and less memory intensive way to query
if an image exists and what its size is. Note, only the size of
the first image in a multi-frame image file is returned.
width and height of the image.
Use this option to specify the width and height of raw images
whose dimensions are unknown such as GRAY, RGB, or CMYK. In
addition to width and height, use -size to skip any header
information in the image or tell the number of colors in a MAP
image file, (e.g. -size 640x512+256).
For Photo CD images, choose from these sizes:
Finally, use this option to choose a particular resolution layer
of a JBIG or JPEG image (e.g. -size 1024x768).
print detailed information about the image.
This information is printed: image name; the image class
(DirectClass or PseudoClass); the total number of unique col‐
ors; whether there is a matte associated with the image; the
number of runlength packets; the image size; the depth of the
image; the image format; the image scene; and finally any image
comment. Refer to miff(1) for a description of the image class.
SEE ALSOdisplay(1), animate(1), montage(1), mogrify(1), convert(1), combine(1),
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ImageMagick 1 May 1994 identify(1)