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ppmdither(1) AMIGA (14 July 1991) 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.
Page 1 (printed 3/1/94)