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pgmenhance(1)									    pgmenhance(1)

       pgmenhance - edge-enhance a portable graymap

       pgmenhance [-N] [pgmfile]

       Reads  a  portable graymap as input.  Enhances the edges, and writes a portable graymap as

       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.

       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.

       pgmedge(1), pgm(5), pbm(5)

       Copyright (C) 1989 by Jef Poskanzer.

					 13 January 1989			    pgmenhance(1)
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