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NAME

       ppmhist - print a histogram of a portable pixmap

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)