pbmtopgm

 

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 pbmtopgm(1)                                           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 soft­
        ware 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.
 
 
 
                            12 Dec 1990                pbmtopgm(1)

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