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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)