ppmdither - ordered dither for color images


SYNOPSIS

       ppmdither  [-dim  power]  [-red  shades]  [-green  shades]
       [-blue shades] [ppmfile]


DESCRIPTION

       Reads a portable pixmap as input, and applies dithering to
       it  to reduce the number of colors used down to the speci­
       fied number of shades for each primary.  The default  num­
       ber  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.


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, includ­
                     ing 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

       pnmdepth(1), ppmquant(1), ppm(5)


AUTHOR

       Copyright (C) 1991 by Christos Zoulas.


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