pbmtomgr
converts PBM bitmaps to MGR window system format
TLDR
Convert PBM to MGR format
$ pbmtomgr [input.pbm] > [output.mgr]
SYNOPSIS
pbmtomgr [file]
DESCRIPTION
pbmtomgr converts PBM bitmaps to MGR window system format. MGR was developed at Bellcore in the 1980s. Part of Netpbm toolkit.