pbmtopgm

NAME
SYNOPSIS
DESCRIPTION
SEE ALSO
AUTHOR
NOTES

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.