plan9 man page for quantize

QUANTIZE(9.1)															     QUANTIZE(9.1)

NAME
       3to1, mcut, improve, quantize, dither - picture color compression

SYNOPSIS
       fb/3to1 [ -e ] colormap [ input ]

       fb/mcut [ input ]

       fb/improve colormap [ input ]

       fb/quantize [ input ]

       fb/dither [ input ]

DESCRIPTION
       3to1  approximates the full color (3 bytes per pixel) or mapped (1 byte per pixel, possibly with a colormap) input picture file in one byte
       per pixel using the given colormap.  If no input file is named, the picture is read from standard input.   The  -e  option  suppresses  the
       default error-diffusion dither.

       Mcut  writes  a	color  map, suitable for use by 3to1 on its standard output.  The color map is computed using the median-cut algorithm and
       represents reasonably well, but not necessarily optimally, the colors of the input picture.

       Improve reads a color map and a picture and writes on standard output a new color map that better represents the  colors  of  the  picture.
       Multiple passes of improve may produce better and better color maps.

       Quantize is an rc script that packages all of the above to compress the full-color input image to one byte per pixel.

       Dither  likewise  compresses  full-color  images to one byte per pixel.	It uses a fixed color map that allows a speedy algorithm; quantize
       instead runs slower but gives better results.

SOURCE
       /sys/src/fb/3to1.c
       /sys/src/fb/mcut.c
       /sys/src/fb/improve.c
       /sys/src/fb/quantize.r
       /sys/src/fb/dither.c

SEE ALSO
       picfile(9.6), cmap(9.6)

																     QUANTIZE(9.1)