When gamut mapping (hue restoration) defined by one Lab color space is applied in color matching under different reference white points, human vision perceives the hue as inconsistent. In view of this, input data which is dependent on a color space of an input device is converted by a first conversion...http://www.google.com.au/patents/US6459436?utm_source=gb-gplus-sharePatent US6459436 - Image processing method and apparatus
