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)