ppmdither

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
SEE ALSO
AUTHOR

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.