Colour Science & Perception
what the eye settles, and what it cannot
Generator

Illuminant D65 and the white it produces

The spectral power distribution of D65 across the visible range, and the colour a perfect white reflector takes under it: chromaticity (0.3127, 0.3290).
Illuminant D65 and the white it producesThe spectral power distribution of D65 across the visible range, and the colour a perfect white reflector takes under it: chromaticity (0.3127, 0.3290).400450500550600650700wavelength / nmD65x 0.3127y 0.3290CIE D65 — average daylight, and the white point sRGB assumesCIE 1931 2° observer

Drawn at its defaults, in spectra and illuminants. It takes no options at all, so every essay calling it gets this exact drawing.

Called by 1 essay

the blast radius of changing it

What light is

The sun is not one illuminant

Daylight is not a blackbody and is not one spectrum. It is a one-parameter family reconstructed from three measured basis functions, its chromaticities lie on a curve that is near the Planckian locus and not on it, and the difference is the reason a colour temperature needs a second number beside it.

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