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Ppmdither User Manual(0)                              Ppmdither User Manual(0)



NAME
       ppmdither - ordered dither for color images


SYNOPSIS
       ppmdither

       [-dim power]

       [-red shades]

       [-green shades]

       [-blue shades]

       [ppmfile]


DESCRIPTION
       This program is part of Netpbm(1).

       ppmdither  reads  a PPM image as input, and applies dithering to it to reduce the number of colors used down to
       the specified number of shades for each primary.  The default number of shades is red=5, green=9, blue=5, for a
       total  of  225  colors.   To  convert  the image to a binary rgb format suitable for color printers, use -red 2
       -green 2 -blue 2.

       You can do another kind of dither -- Floyd-Steinberg -- with pnmquant or pnmremap.


OPTIONS
       -dim power
               The size of the dithering matrix.  The dithering matrix is a square whose dimension is a  power  of  2.
              power is that power of 2.  The default is 4, for a 16 by 16 matrix.


       -red shades
              The number of red shades to be used, including black; minimum of 2.


       -green shades
              The number of green shades to be used, including black; minimum of 2.


       -blue shades
              The number of blue shades to be used, including black; minimum of 2.



SEE ALSO
       pamdepth(1), pnmquant(1), pnmremap(1), ppm(1)


AUTHOR
       Copyright (C) 1991 by Christos Zoulas.



netpbm documentation             14 July 1991         Ppmdither User Manual(0)