pgmenhance(1)           UNIX System V(13 January 1989)            pgmenhance(1)


NAME
      pgmenhance - edge-enhance a portable graymap

SYNOPSIS
      pgmenhance [-N] [pgmfile]

DESCRIPTION
      Reads a portable graymap as input.  Enhances the edges, and writes a
      portable graymap 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 flag 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(5), pbm(5)

AUTHOR
      Copyright (C) 1989 by Jef Poskanzer.





























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