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RedHat 9 (Linux i386) - man page for ppmdist (redhat section 1)

ppmdist(1)			     General Commands Manual			       ppmdist(1)

NAME
       ppmdist - simplistic grayscale assignment for machine generated, 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 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).

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 distrib-
		     uted 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 ppmtopgm(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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