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ppmdist(1)									       ppmdist(1)

       ppmdist - simplistic grayscale assignment for machine generated, color images

       ppmdist [-intensity|-frequency] [ppmfile]

       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 levels 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  performed  in  order  of  input  pixel
       intensity, or input pixel frequency (number of repetitions).

       -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

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

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

       Copyright (C) 1993 by Dan Stromberg.

					   22 July 1992 			       ppmdist(1)
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