COCOGIF(1) CMS COCOGIF(1)
cocogif - color correct a GIF image file
cocogif [ -a source_profile | -s source_profile ] -d destination_profile
[ -h ] [ -o output_file ] [ input_file ]
cocogif uses the International Color Consortium (ICC) profiles to
determine how to perform the appropriate color management operation
("color correction", hence "coco") upon a GIF image file. The operation
will be a color space conversion from the input device color space to the
output device color space.
The device color space associated with the input stream is determined in
one of four ways. The following approaches are tried in order:
o First, if the -s flag is set, the specified source-profile will be
used. Specifying -s will override any profile embedded in the
source image.
o Second, if there is an ICC profile embedded in the source image,
that will be used.
o Third, if the -a flag is set, the specified source_profile will be
used. Embedded profiles take precedence over profiles specified
with -a.
o Finally, the color management system's default RGB profile will be
used. If no default is set, the system searches through
CMS_PROFILE_PATH for the default monitor profile, monitor.pf. If
that profile is not found, cocogif has no way to determine a source
device profile and so passes the input image stream through
unchanged.
The output device color space is determined quite simply from the value
of the -d flag.
If a full path is not provided for a device profile, the system looks
through the directories specified in CMS_PROFILE_PATH.
If, for any reason cocogif is unable to perform the requested conversion,
the source stream is copied to the destination stream. Some of the
reasons that a conversion might not be performed are:
o no destination profile was specified;
o the number of channels in the input or output stream does not match
its profile;
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COCOGIF(1) CMS COCOGIF(1)
o one of the specified profiles could not be found;
o one of the specified profiles could not be read;
o the source image is one bit deep;
o the CMS did not know how to handle one of the profiles;
o the CMS needed to read the system RGB profile and could not.
Command Line Options
cocogif supports the following command line options:
-a source_profile
Specifies a profile to be used with images that do not have an
embedded ICC profile.
-d destination_profile
Specifies a profile for the destination device. The destination
image file format, including the depth and number of channels,
will be determined by this profile.
-h Display a usage message.
-o output_file
The output GIF file. If this is not supplied, cocogif will
write to standard out.
-s source_profile
The profile for the source device. This will override any
profile embedded in the image. If this profile does not match
up with the source stream/source file image file format,
cocogif will pass the source through unchanged.
input_file
The input GIF file. If this is not supplied, cocogif will read
from standard in.
Because cocogif is a filter, it tries to produce valid output if at all
possible. However, there are conditions under which cocogif will exit
with an error condition. These are:
o a source file was specified, but could not be opened;
o a destination file was specified, but could not be opened;
o an unrecoverable system error.
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