Tristimulus values X,
Y and Z
are the amounts of the three primary colors (red, green and blue) of the
visible spectrum of light from 380-780 nm that specify a color stimulus.
They will be derived from the following equations:
Legend:
X, Y, Z
tristimulus values
h
Normalisation factor such that Y
= 100 for a sample that reflects 100% at all wavelengths. Thus
Sl
represents reflectance values of an energy spectrum measured with a
UV/VIS spectrometer for surround of wave l
in given white light - from illuminant.
Pl
represents the relative spectral energy distributions of the illuminant
