pbmtopgm man page on DigitalUNIX

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pbmtopgm(12 Dec 1990)					 pbmtopgm(12 Dec 1990)

NAME
       pbmtopgm	 -  convert  portable  bitmap to portable graymap by averaging
       areas

SYNOPSIS
       pbmtopgm <width> <height> [pbmfile]

DESCRIPTION
       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.

SEE ALSO
       pbm(5)

AUTHOR
       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, pro‐
       vided that the above copyright notice appear in	all  copies  and  that
       both  that  copyright  notice and this permission notice appear in sup‐
       porting documentation.  This  software  is  provided  "as  is"  without
       express or implied warranty.

NOTES
       Pbmtopgm works best with odd sample width and heights.

							 pbmtopgm(12 Dec 1990)
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