X, Y, Z = tristimulus values

P = relative power of the illuminant source

R = reflectance values corresponding to the evaluated object x, y, z = chromaticity values of the standard observer

(X, AX) = related to the wavelengths evaluated (in the visible range) with increments between each wavelength (X) of AX

k = normalization factor

Normalization factor k is selected to ensure that y represents exactly the eye's response curve to the total amount of power. Consequently, the summation of the weighing factors Py must be 1 (or 100% reflectance) and the tristimulus value Y provides information of the lightness of the color, regardless of anything else.1

Mathematical calculations pertaining to our example are shown in Table 2.2.

X, Y, and Z values are used to calculate the chromaticity coordinates (x, y, z) as follows:

0 0

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