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pbmtopgm.1
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1996-11-18
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.TH pbmtopgm "12 Dec 1990"
.SH NAME
pbmtopgm - convert portable bitmap to portable graymap by averaging areas
.SH SYNOPSIS
pbmtopgm <width> <height> [pbmfile]
.SH DESCRIPTION
Reads a portable bitmap as input. Outputs a portable graymap created by
averaging the number of pixels within a sample area of
\fIwidth\fR by \fIheight\fR around each point. Pbmtopgm is similar to a
special case of ppmconvol. A ppmsmooth step may be needed after pbmtopgm.
.PP
Pbmtopgm has the effect of anti-aliasing bitmaps which contain distinct
line features.
.SH "SEE ALSO"
pbm(5)
.SH 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.
.SH NOTES
Pbmtopgm works best with odd sample width and heights.