pbmtoppa
Convert a PBM image to HP Printer Performance Architecture format.
TLDR
Convert a PBM image into a PPA file
$ pbmtoppa [path/to/image.pbm] > [path/to/output.ppa]
Specify the desired dots-per-inch and paper size
$ pbmtoppa -d [300] -s [a4] [path/to/image.pbm] > [path/to/output.ppa]
