Discussion
Consider the following statements about invertibility.
1. CIELAB can be converted back to XYZ given the white point.
2. XYZ cannot be converted back into spectral reflectance.
3. Spectral reflectance can be recovered from CIELAB values.
Answer: A
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: the CIELAB transformation is invertible given the white point, but the tristimulus integration is not - a great many reflectance curves give the same three numbers, which is exactly what metamerism means. Statement 3 follows the same lost information one step further and is equally impossible.
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