Different transformation methods between CIELAB coordinates and Munsell hue

摘要

This research aims to convert CIE L~*C~*_(ab)h_(ab) coordinates into corresponding Munsell hues. Different transformation methods for colour mapping from CIELAB colour space to Munsell hues are proposed. Polynomial equations that predict Munsell hue from CIELAB h_(ab) suffer from poor performance as there is no direct one-to-one mapping. Polynomial methods that predict Munsell hue from all three L~*C~*_(ab)h_(ab) values also show limited performance. However, a distance-weighted look-up-table model based upon the CIEDE2000 colour-difference equation is able to predict Munsell hue to an accuracy of 1 unit of root mean square error. All transformation methods in this paper were developed using CIE illuminant C and the 2° standard observer conditions and were based on 2729 Munsell renotation colour samples.