What are CIE XYZ components?
The CIE system is based on the description of colour as a luminance component Y, as described above, and two additional components X and Z. The spectral weighting curves of X and Z have been standardized by the CIE based on statistics from experiments involving human observers. XYZ tristimulus values can describe any colour. (RGB tristimulus values will be described later.) The magnitudes of the XYZ components are proportional to physical energy, but their spectral composition corresponds to the colour matching characteristics of human vision. The CIE system is defined in Publication CIE No 15.2, Colorimetry, Second Edition (1986) [4].
