ppmdither

   Updated: 14 July 1991
   Table Of Contents

NAME

   ppmdither - ordered dither for color images

SYNOPSIS

   ppmdither  [-dim  power]  [-red shades] [-green shades] [-blue
shades]
   [ppmfile]

DESCRIPTION

   This program is part of Netpbm.

   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.

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, pnmquant, ppm

AUTHOR

   Copyright (C) 1991 by Christos Zoulas.
     _________________________________________________________________



Table Of Contents

     * NAME
     * SYNOPSIS
     * DESCRIPTION
     * OPTIONS
     * SEE ALSO
     * AUTHOR

UNIX/Linux commands referenced on this page:

1. as
2. convert
3. size
4. red
5. pnmdepth
6. pnmquant