ppmrainbow [-width=number] [-height=number]
[-tmpdir=directory] [-verbose] color ...
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 equals signs between an option name and its
ppmrainbow generates a PPM image that fades from one color to another
to another from left to right, like a rainbow. The colors are those
you specify on the command line, in that order. The first color is
added again on the right end of the image.
If you want a vertical or other non-horizontal rainbow, run the output
One use for such a rainbow is to compose it with another image under an
alpha mask in order to add a rainbow area to another image. In fact,
you can make rainbow-colored text by using pbmtext, pnmcomp, and ppm-
The width in pixels of the output image.
Default is 600.
The height in pixels of the output image.
Default is 8.
The directory specification of the directory ppmrainbow is to
use for temporary files.
Default is the value of the TMPDIR environment variable, or /tmp
if TMPDIR is not set.
Print the "commands" (invocations of other Netpbm programs) that
ppmrainbow uses to create the image.
ppmmake(1), pnmcomp(1), pbmtext(1), ppmfade(1), ppm(5).
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