Whiteness (colorimetry)
In colorimetry, whiteness is the degree to which a surface is white. An example of its use might be to quantitatively compare two pieces of paper which appear white viewed individually, but not when juxtaposed. The International Commission on Illumination describes it in the following terms: Calculation. formula_1 formula_2 formula_3 formula_4 where The numbers in the subscript indicate the observer: two for the CIE 1931 standard observer and ten for the CIE 1964 standard observer.