luv = XYZToLuv(xyz,whiteXYZ)
xyz is a 3 x N matrix with xyz in columns
whiteXYZ is a 3 vector of the white point
luv is a 3 x N matrix with L*u*v* in the columns
Formulae are taken from Wyszecki and Stiles, page 167.
xx/xx/xx baw Created.
xx/xx/xx dhb Made compatible with version 3.5
10/10/93 dhb Changed name to XYZToLuv
5/9/02 dhb Improved help.