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gifclrmp

A program to modify GIF image colormaps. Any local colormap in a GIF file can be modified at a time, or the global screen one.

Usage:

gifclrmap [-q] [-s] [-t trans] [-l map] [-g Gamma] [-i image] [-h] gif-file
If no gif-file is given, GifClip will try to read a GIF file from stdin.

Memory required:

Line.

Options:

[-q]
Quiet mode. Defaults off on MSDOS, on under UNIX. Controls printout of running scan lines. Use -q- to invert.

[-s]
Select the global screen color map.

[-l map]
Load color map from this file instead of selected color map.

[-t trans]
Change color index values. The change is made to both the selected color table and the raster bits of the selected image. A translation file is a list of pairs of `before' and `after' index values. At present, the `before' index values must be in ascending order starting from 0.

[-g Gamma]
Apply gamma correction to selected color map.

[-i image]
Select the color map of the numbered image.

[-h]
Print one command line help, similar to Usage above.

Notes:

  • The default operation is to dump out the selected color map in text format.

  • The file to load/dump is simply one color map entry per line. Each such entry line has four integers: "ColorIndex Red Green Blue", where color index is in ascending order starting from 1.

Author:

Gershon Elber
Eric S. Raymond <esr@snark.thyrsus.com>