ppmdither(1) - phpMan

ppmdither(1)                         General Commands Manual                         ppmdither(1)

NAME
       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 col-
       ors 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.

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

AUTHOR
       Copyright (C) 1991 by Christos Zoulas.

                                           14 July 1991                              ppmdither(1)

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