Discussion
Consider the following statements about colour difference formulae.
1. They are fitted to visual data under defined conditions.
2. Parametric factors allow adjustment for other conditions.
3. They apply universally regardless of viewing conditions.
Answer: B
The first two are correct and reflect how the formulae are constructed. The third ignores the reference conditions under which the fitting was done. Universality was never claimed for the formula. Reference conditions accompany the definition.
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