Read a MacPaint file as input and produce a PBM image as output. See also:
pbmtomacp
. More information: https://netpbm.sourceforge.net/doc/macptopbm.html.
macptopbm path/to/file.macp > path/to/output.pbm
macptopbm -extraskip N > path/to/output.pbm
macptopbm -quiet > path/to/output.pbm
macptopbm -version