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Ppmdist User Manual(0)							   Ppmdist User Manual(0)

       ppmdist - simplistic grayscale assignment for machine generated, color images




       This program is part of Netpbm(1)

       ppmdist reads a PPM image as input and 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).

       This program is helpful only for images with a very small number of colors.

	      Sort  input colors by the number of times a color appears in the input, before map-
	      ping to evenly distributed graylevels of output.

	      Sort input colors by their grayscale intensity, before mapping to  evenly  distrib-
	      uted graylevels of output.  This is the default.

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

       Copyright (C) 1993 by Dan Stromberg.

netpbm documentation			   22 July 1992 		   Ppmdist User Manual(0)
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