ppmdither man page on IRIX

ppmdither man page on IRIX

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ppmdither(1)					     ppmdither(1)

NAME
       ppmdither - ordered dither for color images

SYNOPSIS
       ppmdither  [-dim	 power]	 [-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 speci
       fied number of shades for each primary.	The default  num
       ber  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, includ
		     ing 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(1), ppmquant(1), ppm(5)

AUTHOR
       Copyright (C) 1991 by Christos Zoulas.

			   14 July 1991		     ppmdither(1)

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