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
        Common Options ⟨index.html#commonoptions⟩ ), 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
              enhancement; 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