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% input file: fbsharp.1
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\phead{FBSHARP}{1}{25-Jun-90}

%.CM 3
\shead{NAME}
fbsharp -- edge enhance a grayscale or color image
\shead{SYNOPSIS}
\nofill
fbsharp [ -$<$type$>$ ] beta $<$ image $>$ image
\fill
\shead{DESCRIPTION}
\par
Uses a digital Laplacian filter to enhance the edges.  Typical values
of beta run from 1 to 20.  The default is 2.  This command works for
color images, but values of sharpening higher than 3 or 4 tend to create
lots of noisy artifiacts in the image.
\par\vspace{1.0\baselineskip}
The
{\it fbhalf}
command also calls the sharpening code implicitly if the
{\it -s}
optional is passed to
{\it fbhalf.}
\shead{OPTIONS}
\begin{TPlist}{{\bf $<$beta$>$}
}
\item[{{\bf $<$beta$>$}
}]
specifies the amount of sharpening.  Typical values run from 1 to 10,
higher values can cause snow.
\item[{{\bf -B}
}]
{\it face}
format, as used by Bennet Yee's
{\it face}
program at CMU. 
\item[{{\bf -F}
}]
{\it FBM,}
format (by default, the default).  You are guaranteed not
to lose information by specifying FBM as the default.
\item[{{\bf -G}
}]
{\it GIF,}
Compuserve GIF format.
\item[{{\bf -I}
}]
{\it IFF}
format, interleaved bitmaps (ILBM), used by Amigas.
\item[{{\bf -P}
}]
{\it PBM,}
Jef Poskanzer's bitmap format.
\item[{{\bf -S}
}]
{\it sun,}
Sun rasterfiles (not run length encoded).
\end{TPlist}
\shead{EXAMPLE}
\par
Since the -s option of fbahlf(1) exists, you will probably only run
fbsharp on color images, which tolerate less sharpening.  Here we
sharpen an FBM format color image with beta=3 and quantize it for
display on a Sun:
\par\vspace{1.0\baselineskip}
    \% fbsharp 3.0 $<$ foo.fbm $|$ fbquant -S $>$ foo.clr
\shead{SEE ALSO}
fbm(1) for general discussion, pbm(1) for PBM routines.
\shead{BUGS}
None known.
\shead{HISTORY}
Copyright (C) 1989,1990 by Michael Mauldin.  Permission is granted
to use this file in whole or in part for any purpose, educational,
recreational or commercial, provided that this copyright notice
is retained unchanged.  This software is available to all free of
charge by anonymous FTP and in the UUNET archives.
\begin{TPlist}{25-Jun-90  Michael Mauldin at Carnegie Mellon University}
\item[{25-Jun-90  Michael Mauldin at Carnegie Mellon University}]
Release 1.0 mlm@cs.cmu.edu
\item[{07-Mar-89  Michael L. Mauldin at Carnegie Mellon University}]
Beta release (version 0.9) mlm@cs.cmu.edu
\end{TPlist}
\end{document}
