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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.

                               20 December 2001                   ppmcolors(1)