pbmmask man page on OSF1

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pbmmask(1)							    pbmmask(1)

NAME
       pbmmask - create a mask bitmap from a regular bitmap

SYNOPSIS
       pbmmask [-expand] [pbmfile]

DESCRIPTION
       Reads  a portable bitmap as input.  Creates a corresponding mask bitmap
       and writes it out.

       The color to be interpreted as  "background"  is	 determined  automati‐
       cally.  Regardless of which color is background, the mask will be white
       where the background is and black where the figure is.

       This lets you do a masked paste like this, for  objects	with  a	 black
       background:
	   pbmmask obj > objmask
	   pnmpaste < dest -and objmask <x> <y> | pnmpaste -or obj <x> <y>
       For  objects with a white background, you can either invert them or add
       a step:
	   pbmmask obj > objmask
	   pnminvert objmask | pnmpaste -and obj 0 0 > blackback
	   pnmpaste < dest -and objmask <x> <y> | pnmpaste -or blackback <x> <y>
       Note that this three-step version works for objects  with  black	 back‐
       grounds too, if you don't care about the wasted time.

       You  can	 also  use masks with graymaps and pixmaps, using the pnmarith
       tool.  For instance:
	   ppmtopgm obj.ppm | pgmtopbm -threshold | pbmmask > objmask.pbm
	   pnmarith -multiply dest.ppm objmask.pbm > t1.ppm
	   pnminvert objmask.pbm | pnmarith -multiply obj.ppm - > t2.ppm
	   pnmarith -add t1.ppm t2.ppm
       An interesting variation on this	 is  to	 pipe  the  mask  through  the
       pnmsmooth  script before using it.  This makes the boundary between the
       two images less sharp.

       -expand
	      Expands the mask by one pixel out from the image.	 This is  use‐
	      ful  if  you  want  a little white border around your image.  (A
	      better solution might be to turn the pbmlife tool into a general
	      cellular automaton tool...)

SEE ALSO
       pnmpaste(1), pnminvert(1), pbm(5), pnmarith(1), pnmsmooth(1)

AUTHOR
       Copyright (C) 1988 by Jef Poskanzer.

				08 August 1989			    pbmmask(1)
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