ppmdither(1)

NAME

       ppmdither - ordered dither for color images

SYNOPSIS

       ppmdither [-dim dimension] [-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 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.  The  maximum
       number  of  colors  that  can be used is 256 and can be computed as the
       product of the number of red, green and blue shades.

OPTIONS

       -dim dimension
                     The size of the dithering matrix.  Must be a power of  2.

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

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

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

SEE ALSO

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

AUTHOR

       Copyright (C) 1991 by Christos Zoulas.

                                 14 July 1991                     ppmdither(1)