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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 sec-
       tion 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)