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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 in-
tensity, or input pixel frequency (number of repetitions).
OPTIONS
-frequency Sort input colors by the number of times a color appears in the input, be-
fore 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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