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pbmmask
!!!pbmmask
NAME
SYNOPSIS
DESCRIPTION
SEE ALSO
AUTHOR
----
!!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


This lets you do a masked paste like this, for objects with
a black background:


    pbmmask obj
For objects with a white background, you can either invert them or add a step:


    pbmmask obj
Note that this three-step version works for objects with black backgrounds 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
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
useful 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.
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Last edited on Monday, June 3, 2002 6:50:39 pm by "perry"

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