ppmdither
ordered dither for color images
see also :
pnmdepth - ppmquant
Synopsis
ppmdither
[-dim power] [-red shades]
[-green shades] [-blue shades]
[ppmfile]
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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.
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 ,
ppmquant , ppm
author
Copyright (C)
1991 by Christos Zoulas.