generate a color map of all colors of a certain maxval
see also :
pnmdepth - pnmcolormap - ppmcie - ppmrainbow - pgmramp
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.
add an example, a script, a trick and tips
no example yet ...
... Feel free to add your own example above to help other Linux-lovers !
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.
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
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).
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
performs a similar function for PGM images.
This is the maxval of the
generated color map. Default is 5.
pnmcolormap , ppmcie ,
ppmrainbow , pgmramp , ppm
Henderson, December 2001.