ppmdither (1)
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
AUTHOR
Copyright (C) 1991 by Christos Zoulas.
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