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pbmtopgm - convert portable bitmap to portable graymap by averaging
areas
pbmtopgm <width> <height> [pbmfile]
Reads a portable
bitmap as input. Outputs a portable graymap created by averaging the number
of pixels within a sample area of width by height around each point. Pbmtopgm
is similar to a special case of ppmconvol. A ppmsmooth step may be needed
after pbmtopgm.
Pbmtopgm has the effect of anti-aliasing bitmaps which contain
distinct line features.
pbm(5)
Copyright (C) 1990 by Angus
Duggan Copyright (C) 1989 by Jef Poskanzer.
Permission to use, copy, modify,
and distribute this software and its documentation for any purpose and
without fee is hereby granted, provided that the above copyright notice
appear in all copies and that both that copyright notice and this permission
notice appear in supporting documentation. This software is provided "as
is" without express or implied warranty.
Pbmtopgm works best with odd
sample width and heights.
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