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//	    C Implementation of Wu's Color Quantizer (v. 2)
//	    (see Graphics Gems vol. II, pp. 126-133)
//
// Author:	Xiaolin Wu
// Dept. of Computer Science
// Univ. of Western Ontario
// London, Ontario N6A 5B7
// wu@csd.uwo.ca
// 
// Algorithm: Greedy orthogonal bipartition of RGB space for variance
// 	   minimization aided by inclusion-exclusion tricks.
// 	   For speed no nearest neighbor search is done. Slightly
// 	   better performance can be expected by more sophisticated
// 	   but more expensive versions.
// 
// The author thanks Tom Lane at Tom_Lane@G.GP.CS.CMU.EDU for much of
// additional documentation and a cure to a previous bug.
// 
// Free to distribute, comments and suggestions are appreciated.
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// History
// -------
// July 2000:  C++ Implementation of Wu's Color Quantizer
//             and adaptation for the FreeImage 2 Library
//             Author: Herv