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

NAME
       ppmdist	- simplistic grayscale assignment for machine generated, color
       images

SYNOPSIS
       ppmdist

       [-intensity|-frequency]

       [ppmfile]

DESCRIPTION
       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 repeti-
       tions).

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

OPTIONS
       -frequency
	      Sort  input colors by the	number of times	a color	appears	in the
	      input, before mapping to evenly distributed graylevels  of  out-
	      put.

       -intensity
	      Sort  input  colors by their grayscale intensity,	before mapping
	      to evenly	distributed graylevels of output.   This  is  the  de-
	      fault.

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

AUTHOR
       Copyright (C) 1993 by Dan Stromberg.

DOCUMENT SOURCE
       This  manual  page was generated	by the Netpbm tool 'makeman' from HTML
       source.	The master documentation is at

	      http://netpbm.sourceforge.net/doc/ppmdist.html

netpbm documentation		 22 July 1992		Ppmdist	User Manual(0)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SEE ALSO | AUTHOR | DOCUMENT SOURCE

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