Ppmdither User Manual(0) Ppmdither User Manual(0)NAMEppmdither - ordered dither for color images
SYNOPSISppmdither
[-dim power]
[-red shades]
[-green shades]
[-blue shades]
[ppmfile]
DESCRIPTION
This program is part of Netpbm(1).
ppmdither reads a PPM image 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.
You can do another kind of dither -- Floyd-Steinberg -- with pnmquant
or pnmremap.
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 ALSOpamdepth(1), pnmquant(1), pnmremap(1), ppm(1)AUTHOR
Copyright (C) 1991 by Christos Zoulas.
netpbm documentation 14 July 1991 Ppmdither User Manual(0)
