Manual: ppmdist

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 max‐
       imizes 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 fre‐
       quency (number of repetitions).

       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 ), pp‐
       mdist 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 output.

       -intensity
	      Sort  input  colors  by  their grayscale intensity, before mapping to evenly distributed 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(1)