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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
       or pamflip.

       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.

       -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.


	      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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