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rgb2gif
A program to convert 24 bit images to a GIF image using color quantization.
Usage:
rgb2gif [-q] [-c #Colors] [-1] -s Width Height [-h] RGBFile
If no RGBFile is given, RGB2Gif will try to read a GIF file from stdin.
Memory required:
Screen.
Options:
-  [-q]
-  Quiet mode.  Defaulte off on MSDOS, on under UNIX.  Controls printout
   of running scan lines.  Use -q- to invert.
 
-  [-c #Colors] 
-  Specifies number of colors to use, in bits per pixels, so
   '-c 8' specifies actually 256 colors (maximum and default).
 
-  [-1]
-  Only one file in the format of RGBRGB... triplets (Each of R, G, B
   is a byte) is read from input.  This file size is 3 * Width * Height (see
   '-s' below.  If stdin is used for input, this option is implicitly applied.
   The default (if not '-1') is 3 files with the names RGBFile.R, RGBFile.G,
   RGBFile.B, each of which is Width * Height bytes.
 
-  [-s Width Height]
-  Specifies the size of the image to read.
 
-  [-h]
-  Print one line of command line help, similar to Usage above.
 
Author:
Gershon Elber
Eric S. Raymond <esr@snark.thyrsus.com>