home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
World of Video
/
World of Video.iso
/
gfxprograms
/
conversion
/
pbmplus
/
doc
/
pgmenhance.doc
< prev
next >
Wrap
Text File
|
1995-02-13
|
1KB
|
67 lines
pgmenhance(1) PBM Plus pgmenhance(1)
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 optional -N argu-
ment should be a digit from 1 to 9. 1 is the lowest level
of enhancement, 9 is the highest, The default is 9.
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.
SEE ALSO
pgm(5), pbm(5)
AUTHOR
Copyright (C) 1989 by Jef Poskanzer.
Permission to use, copy, modify, and distribute this
software and its documentation for any purpose and without
fee is hereby granted, provided that the above copyright
notice appear in all copies and that both that copyright
notice and this permission notice appear in supporting docu-
mentation. This software is provided "as is" without
express or implied warranty.
Printed 5/25/90 13 January 1989 1