Ppmdist User Manual(1) General Commands Manual Ppmdist User Manual(1)
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
In addition to the options common to all programs based on libnetpbm
(most notably -quiet, see
Common Options ⟨index.html#commonoptions⟩ ), ppmdist recognizes the
following command line 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(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(1)
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