Three primary colors filter the light machine is from the red, green, blue three kinds of color optical glasseses constitute of, can be divided into the certain spectrum to the white light through red, green and blue three lights of primary colors of the characteristic, used for the movie extensively, television, printing etc. aspect, its spectrum sees the diagram through the curve.The red, green and blue glass card number distinguishes for the 3 Hs,3 Ls,3 Qs.