Saturation-Improved Hue-Preserving Gamut Mapping by Weighted Histogram Specification

Abstract

This paper proposes a method for improving the saturation of colors in hue-preserving gamut mapping. The proposed method uses three planes bounded by highly saturated edges of RGB color cube for hue-preserving gamut mapping. Firstly, each color is projected onto one of the three planes to increase the saturation. Then the projected color is transformed into the target color with a designated luminance and the same hue as the original color. Furthermore, a saturation-weighted histogram specification method is also proposed and combined with the proposed gamut mapping method for improving the saturation further than the gamut mapping methods with conventional histogram equalization. Experimental results show that the proposed method can enhance the saturation of color images better than recent hue-preserving gamut mapping methods.