This program is part of Netpbm.
leaftoppm reads a PPM image as input and generates an Interleaf image file as output.
Interleaf is a now-defunct (actually purchased ca. 2000 by BroadVision) technical publishing software company.
There are no command line options defined specifically for leaftoppm, but it recognizes the options common to all programs based on libnetpbm (See Common Options.)
The program is copyright (C) 1994 by Bill O'Donnell.