pgmenhance



Pgmenhance User Manual(0)                            Pgmenhance User Manual(0)




NAME

       pgmenhance - edge-enhance a PGM image



SYNOPSIS

       pgmenhance

       [-N]

       [pgmfile]



DESCRIPTION

       This program is part of Netpbm(1).

       pgmenhance reads a PGM image as input, enhances the edges, and writes a
       PGM image 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 option 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(1)



AUTHOR

       Copyright (C) 1989 by Jef Poskanzer.



netpbm documentation            13 January 1989      Pgmenhance User Manual(0)

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