Read a PBM image as input and produce a compressed GEM .img file as output.
pbmtogemcannot compress repeated lines. More information: https://netpbm.sourceforge.net/doc/pbmtogem.html.
pbmtogem {{path/to/file.pbm}} > {{path/to/file.img}}
pbmtogem {{[-q|-quiet]}}
pbmtogem {{[-v|-version]}}