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ppmdist
!!!ppmdist
NAME
SYNOPSIS
DESCRIPTION
OPTIONS
BUGS
SEE ALSO
AUTHOR
----
!!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 distributed
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.
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Last edited on Monday, June 3, 2002 6:50:58 pm by "perry"

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