Discussion
Storing only tristimulus values rather than spectra prevents
Answer: A
Correct answer: any later recalculation for a different illuminant
Tristimulus values are computed from the spectrum for one particular illuminant and observer, and the spectrum cannot be recovered from them. Store only the values and the data can never be recalculated for another illuminant, so metamerism cannot be assessed and a change of standard illuminant means measuring everything again.
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