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.