NAME
    pgmbentley - Bentleyize a portable graymap

SYNOPSIS
    pgmbentley [pgmfile]

DESCRIPTION
    Reads a  portable graymap as input. Performs The Bentley Effect, and
    writes a portable graymap as output.

    The Bentley Effect is described in "Beyond Photography"  by Holzmann,
    chapter 4, photo 4. It's a vertical smearing based on brightness.

SEE ALSO
    pgmoil(1),ppmrelief(1), pgm(5)

AUTHOR
    Copyright (C) 1990 by Wilson Bent (whb@hoh-2.att.com)