Discussion
Consider the following statements about the CIE whiteness formula.
1. It is defined only for illuminant D65.
2. It is valid only over a limited range of whiteness and tint.
3. It applies equally well to strongly coloured samples.
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: the equation is defined for D65 only, and it is valid only over a bounded range of whiteness and tint, typically about 40 to 5Y minus 280 with a tint between plus and minus 3. Statement 3 is the opposite of the truth - the formula was fitted to near-white samples, and applied to a strongly coloured one it returns a number that means nothing.
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