This program is part of Netpbm(1).
pgmbentley reads a PGM image as input and performs the Bentley Effect, and writes a PGM image as output.
The Bentley Effect is described in "Beyond Photography" by Holzmann, chapter 4, photo 4. It's a vertical smearing based on brightness.
There are no command line options defined specifically
for pgmbentley, but it recognizes the options common to all
programs based on libnetpbm (See
Common Options .)
Copyright (C) 1990 by Wilson Bent (firstname.lastname@example.org)