ppmrainbow(1)

NAME

ppmrainbow - Generate a rainbow

SYNOPSIS

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
value.

DESCRIPTION

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 ppmrainbow.

OPTIONS

-width number

The width in pixels of the output image.

Default is 600.

-height number

The height in pixels of the output image.

Default is 8.

-tmpdir

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.

-verbose

Print the "commands" (invocations of other Netpbm programs) that ppmrainbow uses to create the image.

SEE ALSO

ppmmake(1), pnmcomp(1), pbmtext(1), ppmfade(1), ppm(5).

AUTHOR

Arjen Bax wrote ppmrainbow in June 2001 and contributed it to the Netpbm package. Bryan Henderson wrote this man page in July 2001.

1 July 2001 ppmrainbow(1)