说明：  ％ function [L, a, b] = RGB2Lab(R, G, B) ％ RGB2Lab takes matrices corresponding to Red, Green, and Blue, and ％ transforms them into CIELab. This transform is based on ITU-R ％ Recommendation BT.709 using the D65 white point reference. ％ The error in transforming RGB -> Lab -> RGB is approximately ％ 10^-5. RGB values can be either between 0 and 1 or between 0 and 255. ％ By Mark Ruzon from C code by Yossi Rubner, 23 September 1997. ％ Updated for MATLAB 5 28 January 1998.
(％ function [L, a, b] = RGB2Lab(R, G, B) ％ RGB2Lab takes matrices corresponding to Red, Green, and Blue, and ％ transforms them into CIELab. This transform is based on ITU-R ％ Recommendation BT.709 using the D65 white point reference. ％ The error in transforming RGB-> Lab-> RGB is approximately ％ 10^-5. RGB values can be either between 0 and 1 or between 0 and 255. ％ By Mark Ruzon from C code by Yossi Rubner, 23 September 1997. ％ Updated for MATLAB 5 28 January 1998.)