% Eric Dubois 2014-06-05
% Nonlinear function in the XYZ to CIELAB conversion
% Input x values should be between 0 and 1
function forw = f_xyz2lab(x)
%constants
c1 = (29/6)^2/3;
c2 = (6/29)^3;
c3 = 4/29;
forw = x.^(1/3);
forw(x < c2) = c1*x(x < c2) + c3;