pbmtopgm(12 Dec 1990) pbmtopgm(12 Dec 1990)
NAMEpbmtopgm - convert portable bitmap to portable graymap by averaging
areas
SYNOPSISpbmtopgm <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 ALSOpbm(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)