pgmenhance - edge-enhance a portable graymap
pgmenhance [''-N''? [''pgmfile''?
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.
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.