man > pgmenhance(1)

Pgmenhance User Manual(1)              General Commands Manual             Pgmenhance User Manual(1)

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
       In addition to the options common to all programs based on libnetpbm  (most  notably  -quiet,
       see ]8;;index.html#commonoptions\ Common Options]8;;\ ), pgmenhance recognizes the following command line option:



       -N

              The  optional  -N  option should be a digit from 1 to 9.  1 is the lowest level of en‐
              hancement; 9 is the highest.  The default is 9.




SEE ALSO
       pamedge(1), pgm(1)


AUTHOR
       Copyright (C) 1989 by Jef Poskanzer.

DOCUMENT SOURCE
       This manual page was generated by the Netpbm tool 'makeman' from  HTML  source.   The  master
       documentation is at

              http://netpbm.sourceforge.net/doc/pgmenhance.html

netpbm documentation                       13 January 1989                 Pgmenhance User Manual(1)