CIE2000

  This function Compute the CIEDE2000 color-difference between the sample between a reference with CIELab coordinates Labsample and a standard with CIELab coordinates Labstd The function works on multiple standard and sample vectors too provided Labstd and Labsample are K x 3 matrices with samples and standard specification in corresponding rows of Labstd and Labsample The optional argument KLCH is a 1x3 vector containing the value of the parametric weighting factors kL, kC, and kH these default to 1 if KLCH is not specified.