CentOS 7.0 - man page for ppmrainbow (centos section 0)
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Ppmrainbow User Manual(0) Ppmrainbow User Manual(0)
ppmrainbow - Generate a rainbow
[-width=number] [-height=number] [-tmpdir=directory] [-norepeat] [-verbose] color ...
This program is part of Netpbm(1)
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 unless you specify
the -norepeat option.
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, pamcomp, and ppmrainbow.
pgmramp does a similar thing for grayscale images.
If you just want an image containing all the possible colors (for some kind of processing;
not to look at), see pamseq.
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.
The width in pixels of the output image.
Default is 600.
The height in pixels of the output image.
Default is 8.
This option makes ppmrainbow end the rainbow with the last color you specify.
Without this option, ppmrainbow adds the first color you specify to the right end
of the rainbow as if you had repeated it. (I don't understand the point of this
default behavior; it exists today just for backward compatibility).
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 always creates a directory within this directory and creates all its
files within that directory.
Print the 'commands' (invocations of other Netpbm programs) that ppmrainbow uses to
create the image.
pgmramp(1) , pamseq(1) , pamgradient(1) , ppmmake(1) , ppmfade(1) , ppm(1)
Arjen Bax wrote ppmrainbow in June 2001 and contributed it to the Netpbm package. Bryan
Henderson wrote this manual in July 2001.
netpbm documentation 09 December 2009 Ppmrainbow User Manual(0)
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