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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 repetitions).
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 map-
ping 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.
SEE ALSO
ppmtopgm(1), ppmhist(1), ppm(1)
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)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
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