NAME¶
ppmcolors - generate a color map of all colors of a certain maxval
SYNOPSIS¶
ppmcolors [
-maxval=maxval]
All options can be abbreviated to their shortest unique prefix. You may use two
hyphens instead of one to designate an option. You may use either white space
or an equals sign between an option name and its value.
DESCRIPTION¶
ppmcolors generates a PPM color map containing all the colors
representable with a certain maxval.
A PPM color map is a regular PPM image that is used by some programs to define a
set of colors.
ppmcolors generates a one row PPM image that contains one pixel of each
color representable by the maxval you choose. The maxval of the PPM image is
that maxval. Note that you can change the maxval of the color map by running
the output of
ppmcolors through
pnmdepth. As long as the new
maxval is a multiple of the original, the resulting set of colors will be
identical. If the new maxval is not a multiple, the resulting set of colors
will be slightly different.
When you select a maxval of 5 (which is the default), you get a color map of the
set of "web safe" colors as defined by Netscape. Most web browsers
guarantee that they can produce at least these 216 colors (215 plus black).
pnmcolormap is another program to generate a color map. It chooses a set
of colors designed to represent the colors in a specified image (or simply the
set of all the colors in that image, if you choose).
pgmramp performs a similar function for PGM images.
OPTIONS¶
- -maxval=maxval
- This is the maxval of the generated color map. Default is 5.
SEE ALSO¶
pnmdepth(1),
pnmcolormap(1),
ppmcie(1),
ppmrainbow(1),
pgmramp(1),
ppm(5)
AUTHOR¶
By Bryan Henderson, December 2001.