This function can take either the name of a standardised illuminants, x and y chromaticity coordinates or X, Y, and Z tristimulus values and converts it to tristimulus values normalised to Y=100. All Illuminant series A-F are supported and can be queried both on the CIE 1931 2° and CIE 1964 10° chromaticity coordinates.
as_white_ref(x, fow = 2)
A string giving the name of the standardized illuminant or a 2 (chromaticity) or 3 (trsitimulus) length numeric vector.
The field-of-view for the illuminant - either
A 3-length vector with tristimulus values
1 2 3 4 5
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