pbmtox10bm
converts PBM bitmaps to X10 bitmap format, which predates the current X11
TLDR
Convert PBM to X10 bitmap format
$ pbmtox10bm [input.pbm] > [output.xbm]
SYNOPSIS
pbmtox10bm [file]
DESCRIPTION
pbmtox10bm converts PBM bitmaps to X10 bitmap format, which predates the current X11 bitmap format. Part of Netpbm toolkit.