If one gamut mapping defined by the Lab color space is applied in color matching under different reference white points, the human vision perceives the hue as inconsistent. In one embodiment, the interconnect structures are fabricated with a dual-damascene method having trenches then vias formed. There is a communication link between the playing card-reading sensors and a processor, and the processor analyzes the data and displays certain game-related data on a display device. The resultant structure is coated with a passivation layer. In particular, photonic crystals can be formed. The laryngoscope blade has a channel which extends at least partially though the blade and receives a light source.