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)

---

Free and Open Source Software