osx man page for pgmenhance

pgmenhance(1)                                                 General Commands Manual                                                pgmenhance(1)

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)