pgmenhance

   Updated: 13 January 1989
   Table Of Contents

NAME

   pgmenhance - edge-enhance a PGM image

SYNOPSIS

   pgmenhance [-N] [pgmfile]

DESCRIPTION

   This program is part of Netpbm.

   pgmenhance reads a PGM image as input, enhances the edges, and
writes a PGM
   image as output.

   The	edge enhancing technique is taken from Philip  R.  Thomp-
son'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 option 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, pgm

AUTHOR

   Copyright (C) 1989 by Jef Poskanzer.
     _________________________________________________________________



Table Of Contents

     * NAME
     * SYNOPSIS
     * DESCRIPTION
     * OPTIONS
     * SEE ALSO
     * AUTHOR

UNIX/Linux commands referenced on this page:

1. as
2. which
3. pgmedge