ppmrainbow - Generate a rainbow
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.
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 through pnmrotate.
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
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
Default is the value of the TMPDIR environment
variable, or /tmp if TMPDIR is not
ppmrainbow__ uses to create the
ppmmake(1), pnmcomp(1), pbmtext(1),
Arjen Bax wrote ppmrainbow in June 2001 and
contributed it to the Netpbm package. Bryan Henderson wrote
this man page in July 2001.