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Pgmenhance User Manual(0)						Pgmenhance User Manual(0)

       pgmenhance - edge-enhance a PGM image




       This program is part of Netpbm(1)

       pgmenhance  reads a PGM image as input, enhances the edges, and writes a PGM image as out-

       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 option should be a digit from 1 to 9.	1 is the lowest level of enhance-
       ment; 9 is the highest.	The default is 9.

       pgmedge(1) , pgm(1)

       Copyright (C) 1989 by Jef Poskanzer.

netpbm documentation			 13 January 1989		Pgmenhance User Manual(0)
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