This program is part of Netpbm.
ppmtoleaf reads an Interleaf image file as input and generates a PPM image 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 ppmtoleaf, 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.