ppmcolors(1)ppmcolors(1)NAMEppmcolors - generate a color map of all colors of a cer
tain maxval
SYNOPSISppmcolors [-maxval=maxval]
All options can be abbreviated to their shortest unique
prefix. You may use two hyphens instead of one to desig
nate an option. You may use either white space or an
equals sign between an option name and its value.
DESCRIPTIONppmcolors 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 col
ors 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 ALSOpnmdepth(1), pnmcolormap(1), ppmcie(1), ppmrainbow(1),
pgmramp(1), ppm(5)AUTHOR
By Bryan Henderson, December 2001.
Contributed to the public domain.
20 December 2001 ppmcolors(1)
