Definition
D65 is a tabulated SPD in increments of 5 nm from 300 nm to 830 nm, using linear interpolation on the original data binned at 10 nm. The CIE recommends using linear interpolation of the component SPDs, S0, S1, and S2 if the application requires greater precision, but there is a proposal to use spline interpolation instead.
The CIE 1931 color space chromaticity coordinates of D65 are x=0.31271, y=0.32902 using the standard observer and x=0.31382, y=0.33100 using the supplementary observer. Normalizing for relative luminance, the XYZ tristimulus values are X=95.047, Y=100.00, Z=108.883. Since D65 represents white light, its co-ordinates are also a white point, corresponding to a correlated color temperature of 6504 K. Rec. 709, used in HDTV systems, truncates the CIE 1931 coordinates to x=0.3127, y=0.3290.
Read more about this topic: Illuminant D65
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