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+.\" This man page was generated by the Netpbm tool 'makeman' from HTML source.
+.\" Do not hand-hack it!  If you have bug fixes or improvements, please find
+.\" the corresponding HTML page on the Netpbm website, generate a patch
+.\" against that, and send it to the Netpbm maintainer.
+.TH "Pgmdeshadow User Manual" 0 "06 July 2006" "netpbm documentation"
+
+.SH NAME
+
+pgmdeshadow - Deshadow a PGM image
+
+.UN synopsis
+.SH SYNOPSIS
+
+\fBpgmdeshadow\fP
+
+[\fIpnmfile\fP]
+
+.UN description
+.SH DESCRIPTION
+.PP
+This program is part of
+.BR "Netpbm" (1)\c
+\&.
+.PP
+\fBpgmdeshadow\fP removes gray shadows from an image.  This is
+useful for an image containing text, such as a scanned book pages,
+where a shadow typically appears near the book crease or near one side
+of the image.  \fBpgmdeshadow\fP recognizes a gray shadow as an area
+of smoothly changing color, starting from the outer edges of the
+image.  The program uses a simple image reconstruction algorithm to
+determine the local shadow gray level, then divides each pixel's gray
+level by the local shadow gray level.
+.PP
+The algorithm is the "fast hybrid grayscale reruction"
+algorithm from Luc Vincent, "Morphological Grayscale Reruction in
+Image Analysis: Applications and Efficient Algorithms.
+
+
+.UN options
+.SH OPTIONS
+.PP
+There are no command line options defined specifically
+for \fBpgmdeshadow\fP, but it recognizes the options common to all
+programs based on libnetpbm (See 
+.UR index.html#commonoptions
+ Common Options
+.UE
+\&.)
+
+.UN references
+.SH REFERENCES
+
+
+
+.IP \(bu
+Luc Vincent, "Morphological Grayscale Reconstruction in Image
+Analysis: Applications and Efficient Algorithms," IEEE
+Transactions on Image Processing, vol. 2, no. 2, April 1993,
+pp. 176-201.
+
+
+
+
+.UN seealso
+.SH SEE ALSO
+.BR "ppmshadow" (1)\c
+\&,
+.BR "pgm" (1)\c
+\&
+
+.UN history
+.SH HISTORY
+.PP
+\fBpgmdeshadow\fP was added to Netpbm in Version 10.35 (August 2006).
+.SH DOCUMENT SOURCE
+This manual page was generated by the Netpbm tool 'makeman' from HTML
+source.  The master documentation is at
+.IP
+.B http://netpbm.sourceforge.net/doc/pgmdeshadow.html
+.PP
+\ No newline at end of file