ppmhist - print a histogram of a portable pixmap
ppmhist [-hexcolor] [-noheader] [-map]
[-nomap] [-sort={frequency,rgb}]
[ppmfile]
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.
- -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.
- 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.
Copyright (C) 1989 by Jef Poskanzer.