This program is part of Netpbm.
pgmtosbig reads a PGM image as input and produces a Santa Barbara Instrument Group SBIG Type 3 image as output.
Note that this format is distinct from the SBIG ST-4 format.
There are no command line options defined specifically for pgmtosbig, but it recognizes the options common to all programs based on libnetpbm (See Common Options.)
pgmtosbig was new in Netpbm 10.70, and was intended primarily as a test tool for sbigtopgm.