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

       pgmdeshadow - Deshadow a PGM image



       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,  "Mor-
       phological Grayscale Reruction in Image Analysis: Applications and Efficient Algorithms.


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

       ppmshadow(1) , pgm(1)

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

netpbm documentation			   06 July 2006 	       Pgmdeshadow User Manual(0)
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