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Three of the following are CIE daylight illuminants. Which is the odd one out?

  • A.D75 representing a bluer north sky
  • B.A representing a tungsten filament lamp
  • C.D50 as used widely throughout the graphic arts
  • D.D65 representing average daylight

Answer: B

Illuminant A represents incandescent light rather than daylight. The other three are members of the D series derived from daylight measurements. Illuminant A is a tungsten representation. The D series came from real daylight measurement.

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