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macptopbm General Commands Manual macptopbm


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 trans‐
ferring 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, pbm(5)


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

29 March 1989 macptopbm