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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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