Generate a rainbow
see also :
ppmmake - pnmcomp - pbmtext - ppmfade
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 value.
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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
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 ppmrainbow.
The width in pixels of the
The height in pixels of the
The directory specification of
the directory ppmrainbow is to use for temporary
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.
pnmcomp , pbmtext , ppmfade ,
Arjen Bax wrote
ppmrainbow in June 2001 and contributed it to the
Netpbm package. Bryan Henderson wrote this man page in July