... Measure reflection color and transmission color of objects and can test chromaticity, whiteness and color difference between two objects or two ... ; Y, x, y; L*, a*, b*; L, a, b; L*, u*, v*; L*, c*, h*l Color difference: Δ E (L*a*b ... *); ΔE (Lab); ΔE (L*u*v*); ΔL*, ΔC*, ΔH*l Whiteness: W, Tl Computer system: Pentium ...