NAME

       ppmrainbow - Generate a rainbow

SYNOPSIS

       ppmrainbow

       [-width=number] [-height=number] [-tmpdir=directory] [-norepeat] [-verbose] color ...

DESCRIPTION

       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.

       If you want a vertical or other non-horizontal rainbow, run the output through pnmrotate or pamflip.

       One  use for such a rainbow is to compose it with another image under a transparency 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.

ARGUMENTS

       color ... is the list of colors, in order from left to right, to go into the rainbow.

       The first color is added again on the right end of the image unless you  specify  the  -norepeat  option.
       This means you can concatenate multiple copies (tile, as with pnmtile) to make a continuous larger image.

       color is as described for the argument of the pnm_parsecolor() library routine .

OPTIONS

       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.

       -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.

       -norepeat

              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.

       -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.

              ppmrainbow  always creates a directory within this directory and creates all its files within that
              directory.

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

SEE ALSO

       pgmramp(1), pamseq(1), pamgradient(1), ppmmake(1), ppmfade(1), ppm(1).

AUTHOR

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

DOCUMENT SOURCE

       This manual page was generated by the Netpbm tool 'makeman' from HTML source.  The  master  documentation
       is at

              http://netpbm.sourceforge.net/doc/ppmrainbow.html

netpbm documentation                            12 November 2014                       Ppmrainbow User Manual(1)