pgmdeshadow man page on CentOS

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Pgmdeshadow User Manual(0)			    Pgmdeshadow User Manual(0)

NAME
       pgmdeshadow - Deshadow a PGM image

SYNOPSIS
       pgmdeshadow

       [pnmfile]

DESCRIPTION
       This program is part of Netpbm(1).

       pgmdeshadow  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.
       pgmdeshadow 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.

       The algorithm is the 'fast hybrid grayscale reruction'  algorithm  from
       Luc  Vincent,  "Morphological  Grayscale	 Reruction  in Image Analysis:
       Applications and Efficient Algorithms.

OPTIONS
       None.

REFERENCES
       ·      Luc Vincent, 'Morphological Grayscale Reruction in Image	Analy‐
	      sis:  Applications  and Efficient Algorithms,' IEEE Transactions
	      on Image Processing, vol. 2, no. 2, April 1993, pp. 176-201.

SEE ALSO
       ppmshadow(1), pgm(1)

HISTORY
       pgmdeshadow was added to Netpbm in Version 10.35 (August 2006).

netpbm documentation		 06 July 2006	    Pgmdeshadow User Manual(0)
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