This program is part of Netpbm(1).
imgtoppmreads an Img-whatnot file as input and produces a PPM image as output. The Img-whatnot toolkit is available for FTP on venera.isi.edu, along with numerous images in this format.
Based on a simple conversion program posted to comp.graphics by Ed Falk.
Copyright (C) 1989 by Jef Poskanzer.