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ppmcolormask(1) 								  ppmcolormask(1)

       ppmcolormask - produce mask of areas of a certain color in a PPM file

       ppmcolormask color [ppmfile]

       Reads  a  PPM  file as input.  Produces a PBM (bitmap) file as output.  The output file is
       the same dimensions as the input file and is black in all places where the input  file  is
       the color color, and white everywhere else.

       The output of ppmcolormask is useful as an alpha mask input to pnmcomp.	Note that you can
       generate such an alpha mask automatically as you convert to PNG format  with  pnmtopng(1).
       Use its -transparent option.

       ppmfile	is  the  input	file.	If  you don't specify ppmfile, the input is from Standard

       The output goes to Standard Output.

       You can specify color five ways:

       o      An X11-style color name (e.g.  black).

       o      An X11-style hexadecimal specifier: rgb:r/g/b, where r g	and  b	are  each  1-  to
	      4-digit hexadecimal numbers.

       o      An X11-style decimal specifier: rgbi:r/g/b, where r g and b are floating point num-
	      bers between 0 and 1.

       o      For backwards compatibility, an old-X11-style hexadecimal  number:  #rgb,  #rrggbb,
	      #rrrgggbbb, or #rrrrggggbbbb.

       o      For backwards compatibility, a triplet of numbers separated by commas: r,g,b, where
	      r g and b are floating point numbers between 0 and 1.  (This style was added before
	      MIT came up with the similar rgbi style.)

       pgmtoppm(1), pnmcomp(1), pbmmask(1), ppm(5)

       Bryan Henderson (bryanh@giraffe-data.com)

					  14 April 2000 			  ppmcolormask(1)
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