2 May 2012
gifclrmp 1 GIFLIB GIFLIB Documentation
gifclrmp extract colormaps from GIF images
`gifclrmp` -v -s -l mapfile -t trans -g gamma -i image -h gif-file

## Description

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.

## Options

-v

  Verbose mode (show progress). Enables printout of running scan lines.

-s

  Select the global screen color map.

-l mapfile

  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.

If no GIF file is given, gifclip will try to read a GIF file from stdin.

## 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.