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RedHat 9 (Linux i386) - man page for ppmhist (redhat section 1)

ppmhist(1)									       ppmhist(1)

NAME
       ppmhist - print a histogram of a PPM image

SYNOPSIS
       ppmhist [-hexcolor] [-noheader] [-map] [-nomap] [-sort={frequency,rgb}] [ppmfile]

DESCRIPTION
       Reads a PPM image as input.  Generates a histogram of the colors in the image, i.e. a list
       of all the colors and how many pixels of each color are in the image.

OPTIONS
       -sort={frequency,rgb}
	      The -sort option determines the order in which the colors are listed in the output.
	      frequency  means	to  list  them in order of how pixels in the input image have the
	      color, with the most represented colors first.  rgb means to sort them first by the
	      intensity  of  the  red component of the color, the of the green, then of the blue,
	      with the least intense first.

	      The default is frequency.

       -hexcolor
	      Print the color components in hexadecimal.  Default is decimal.

       -noheader
	      Do not print the column headings.

       -map   Generates a PPM file of the colormap for the image, with	the  color  histogram  as
	      comments.

       -nomap Generates the histogram for human reading.  This is the default.

SEE ALSO
       ppm(5), pgmhist(1), ppmtomap(1), pnmhistmap(1), ppmchange(1)

AUTHOR
       Copyright (C) 1989 by Jef Poskanzer.

					17 September 2000			       ppmhist(1)


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