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ppmdither - ordered dither for color images
ppmdither [-dim power] [-red shades] [-green shades] [-blue shades] [ppmfile]
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.
-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.
pnmdepth(1), ppmquant(1), ppm(5)
Copyright (C) 1991 by Christos Zoulas.
14 July 1991 ppmdither(1)
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