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- pgmenhance(1) PBM Plus pgmenhance(1)
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- NAME
- pgmenhance - edge-enhance a portable graymap
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- SYNOPSIS
- pgmenhance [-N] [pgmfile]
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- 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.
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- 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.
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- SEE ALSO
- pgm(5), pbm(5)
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- AUTHOR
- Copyright (C) 1989 by Jef Poskanzer.
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- 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.
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- Printed 5/25/90 13 January 1989 1
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