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ppmdist(1)					       ppmdist(1)

NAME
       ppmdist - simplistic grayscale assignment for machine gen
       erated, color images

SYNOPSIS
       ppmdist [-intensity|-frequency] [ppmfile]

DESCRIPTION
       Reads a portable pixmap as input,  performs  a  simplistic
       grayscale  assignment  intended	for use with grayscale or
       bitmap printers.

       Often conversion from ppm to pgm will yield an image  with
       contrast	 too  low  for	good printer output.  The program
       maximizes contrast between the gray levels output.

       A ppm input of n colors is read, and a pgm of n gray  lev
       els  is	written.   The	gray  levels  take  on the values
       0..n-1, while maxval takes on n-1.

       The mapping from color to stepped grayscale  can	 be  per
       formed  in  order of input pixel intensity, or input pixel
       frequency (number of repetitions).

OPTIONS
       -frequency    Sort input colors by  the	number	of
		     times  a  color appears in the input,
		     before mapping to evenly  distributed
		     graylevels	  of  output.	-intensity
		     Sort input colors by their	 grayscale
		     intensity,	 before	 mapping to evenly
		     distributed  graylevels  of   output.
		     This is the default.

BUGS
       Helpful only for images with a very small number of
       colors.	Perhaps should have been an option to ppm
       topgm(1).

SEE ALSO
       ppmtopgm(1), ppmhist(1), ppm(5)

AUTHOR
       Copyright (C) 1993 by Dan Stromberg.

			   22 July 1992		       ppmdist(1)

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