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Since D65 represents white light, its coordinates 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=0.329.
The house above appears a light cream during midday, but seems to be bluish white here in the dim light before full sunrise. Note the color temperature of the sunrise in the background. Video camera operators can white-balance objects that are not white, downplaying the color of the object used for white-balancing. For instance, they can bring ...
A list of standardized illuminants, their CIE chromaticity coordinates (x,y) of a perfectly reflecting (or transmitting) diffuser, and their correlated color temperatures (CCTs) are given below. The CIE chromaticity coordinates are given for both the 2 degree field of view (1931) and the 10 degree field of view (1964). [ 1 ]
The paper stresses the importance of also returning the Δ uv value for evalulation of light sources. [25] As it does not use one fixed table, it can be applied to any observer color matching function. [26] The inverse calculation, from color temperature to corresponding chromaticity coordinates, is discussed in Planckian locus § Approximation.
Japanese color code Numeric color code Alphabetic color code Color Approximate CRI Color temperature (K) N/A 29 WW Warm white ≈52 3000 WW 35 W White ≈56 3500 W 33 CW Cool White ≈62 4000-4300 N/A 25 N/A Neutral/Universal White ≈75 4000 N N/A N/A Natural Daylight ≈70 5000 D 54 D Daylight ≈75 6500 Deluxe halophosphate tubes
The lower the CCT, the warmer (redder) a light looks. 4230K is about the same color as moonlight, which is "cooler" than your old tungsten but "warmer" than your expectation of a 5000K white. If I recall correctly, in the old days fluorescent manufacturers used to give "warm" (~2800 K incandescent), "cool" (~4000 K moonlight-ish), and "daylight ...
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