gifclrmp − extract colormaps from GIF images
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gifclrmp [−v] [−s] [−l mapfile] [−t trans] [−g gamma] [−i image] [−h] [gif−file] |
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.
−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.
• 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.
Gershon Elber.