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, 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.

NOTES
Pbmtopgm works best with odd sample width and heights.