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A colour with x and y both equal to the white point coordinates is

  • A.outside the range of realisable colours
  • B.neutral, whatever its luminance factor may be
  • C.necessarily white and also of maximum lightness
  • D.necessarily black and of zero lightness

Answer: B

Chromaticity says nothing about the luminance and therefore nothing about lightness. Black, grey and white all share the same chromaticity coordinates. Chromaticity is normalised for luminance. The whole neutral axis maps to one point.

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