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       macptopbm - convert a MacPaint file into a portable bitmap


       macptopbm [-extraskip N] [macpfile]


       Reads  a MacPaint file as input.  Produces a portable bitmap as output.


              This flag is to get  around  a  problem  with  some  methods  of
              transferring  files  from the Mac world to the Unix world.  Most
              of these methods leave the Mac files alone, but a  few  of  them
              add the "finderinfo" data onto the front of the Unix file.  This
              means an extra 128 bytes to skip over  when  reading  the  file.
              The  symptom  to  watch for is that the resulting PBM file looks
              shifted to one side.  If you get this, try -extraskip  128,  and
              if that still doesn’t look right try another value.

       All flags can be abbreviated to their shortest unique prefix.


       picttoppm(1), pbmtomacp(1), pbm(5)


       Copyright  (C)  1988  by  Jef  Poskanzer.  The MacPaint-reading code is
       copyright (c) 1987 by Patrick J. Naughton (

                                 29 March 1989                    macptopbm(1)