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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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