Page 205 - Computational Colour Science Using MATLAB

192 COLOUR TOOLBOX

11.11 dhpolarity (Box 11)

% function [p] = dhpolarity(lab1,lab2)
% computes polarity of hue difference
% lab1 and lab2 must be 3 by 1 or 1 by 3 matrices
% and contain L*, a* and b* values
% p is +1 if the hue of the trial (lab2) is anticlockwise
% from the standard (lab1) and -1 otherwise

11.12 cmcde.m (Box 12)

% function [de,dl,dc,dh] = cmcde(lab1,lab2,paral,parac)
% computes colour difference from CIELAB values
% using CMC(l:c) formula
% lab1 and lab2 must be 3 by 1 or 1 by 3 matrices
% and contain L*, a* and b* values
% The dl, dc and dh components are CMC deltas
% The defaults for paral and parac are 1
% see also cielabde, cie94de, and cie00de

11.13 cie94de.m (Box 13)

% function [de,dl,dc,dh] = cie94de(lab1,lab2)
% computes colour difference from CIELAB values
% using the CIE94 formula
% lab1 and lab2 must be 3 by 1 or 1 by 3 matrices
% and contain L*, a* and b* values
% The dl, dc and dh components are CIE94 deltas
% see also cielabde, cmcde, and cie00de