NAME

       pgmenhance - edge-enhance a portable graymap

SYNOPSIS

       pgmenhance [-N] [pgmfile]

DESCRIPTION

       Reads a portable graymap as input.  Enhances the edges, and writes a portable graymap as output.

       The edge enhancing technique is taken from Philip R. Thompson's "xim" program, which in turn took it from
       section 6 of "Digital Halftones by Dot Diffusion", D. E. Knuth, ACM Transaction on Graphics Vol.  6,  No.
       4, October 1987, which in turn got it from two 1976 papers by J. F. Jarvis et. al.

OPTIONS

       The  optional  -N  flag  should  be  a digit from 1 to 9.  1 is the lowest level of enhancement, 9 is the
       highest, The default is 9.

SEE ALSO

       pgmedge(1), pgm(5), pbm(5)

AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.

                                                 13 January 1989                                   pgmenhance(1)