Read a HIPS file as input and return a PGM image as output. If the HIPS file contains more than one frame in sequence,
hipstopgm
will concatenate all the frames vertically. More information: https://netpbm.sourceforge.net/doc/hipstopgm.html.
hipstopgm path/to/file.hips
hipstopgm -quiet
hipstopgm -version