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Ppmdither User Manual(0)						 Ppmdither User Manual(0)

NAME
       ppmdither - ordered dither for color images

SYNOPSIS
       ppmdither

       [-dim=power]

       [-red=n]

       [-green=n]

       [-blue=n]

       [netpbmfile]

       All  options  can be abbreviated to their shortest unique prefix.  You may use two hyphens
       instead of one to designate an option.  You may use either white space or an  equals  sign
       between an option name and its value.

DESCRIPTION
       This program is part of Netpbm(1)

       ppmdither  reads a Netpbm 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.	It produces a PPM
       image as output.

       The default number of shades is 5 red, 9 green, and 5 blue, for a total of 225 colors.  To
       convert the image to a binary rgb format suitable for primitive 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 dimen-
	      sion is a power of 2.  power is that power of 2.	The default is 4, for a 16 by  16
	      matrix.

       -red=n The number of red shades to be used, including black; minimum of 2.

	      Default is 5.

       -green n
	      The number of green shades to be used, including black; minimum of 2.

	      Default is 9.

       -blue n
	      The number of blue shades to be used, including black; minimum of 2.

	      Default is 5.

SEE ALSO
       pamditherbw(1) , pamdepth(1) , pnmquant(1) , pnmremap(1) , ppm(1)

AUTHOR
       Copyright (C) 1991 by Christos Zoulas.

netpbm documentation			 16 December 2009		 Ppmdither User Manual(0)
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