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pgmenhance.1
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1994-08-27
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987b
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pgmenhance(1) USER COMMANDS pgmenhance(1)
NAME
pgmenhance - edge-enhance a portable graymap
SYNOPSIS
pgmenhance [-_✓N] [_✓p_✓g_✓m_✓f_✓i_✓l_✓e]
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.
Sun Release 4.0 Last change: 13 January 1989 1