Pgmenhance User Manual(0)			     Pgmenhance User Manual(0)



NAME
       pgmenhance - edge-enhance a PGM image


SYNOPSIS
       pgmenhance

       [-N]

       [pgmfile]


DESCRIPTION
       This program is part of Netpbm(1).

       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.  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 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(1), pgm(1)


AUTHOR
       Copyright (C) 1989 by Jef Poskanzer.



netpbm documentation		13 January 1989	     Pgmenhance User Manual(0)