pbmtopgm(1)

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)