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.