color-xyz-to-lab

color-xyz-to-lab is a compiled Lisp function in `color.el'.

(color-xyz-to-lab X Y Z &optional WHITE-POINT)

Convert CIE XYZ to CIE L*a*b*.
WHITE-POINT specifies the (X Y Z) white point for the
conversion. If omitted or nil, use `color-d65-xyz'.