Metamerism Questions and Answers

Answer: C

Both are true and the reason gives the gap, and observer metamerism is the mechanism. Highly metameric pairs are the most vulnerable to it. Identical spectra would agree for everyone. Spectral difference drives the disagreement.

Answer: D

Identical spectra would give identical results for every observer alike. The greater the spectral difference, the more the observers will disagree. Spectral difference drives the disagreement. A spectral match is immune to the effect.

Answer: A

The first two are correct and follow from the mechanism. The third is wrong, since identical spectra match for every observer without exception. A spectral match is immune to the effect. Identical curves agree for every observer.

Answer: B

Differences in surface texture or in the presence of metallic flake are the usual cause. Multi-angle measurement is required for such materials. Texture and flake both cause the dependence. Several angles must therefore be measured.

Answer: C

Both are true and the reason gives the cause of the angle dependence, and one reading cannot describe such a finish. Several measurement angles are written into the specification for these coatings. A single angle cannot describe the finish. Automotive coatings are the usual example.

Answer: D

The two degree and ten degree observers exist for exactly this reason. A pair matching at one field size may separate at the other. Receptor mix varies with retinal eccentricity. Two standard observers exist for this reason.

Answer: A

The two observers have measurably different colour matching functions. Field size metamerism is precisely this failure. The two observers differ measurably in their functions. Field size must accompany a specification.

Answer: B

Only a smaller spectral difference reduces the sensitivity to conditions. Everything else merely changes which condition happens to reveal it. The property lies in the spectral difference. Assessment reveals rather than removes it.

Answer: C

Correct answer: Both A and R are true, and R is the correct explanation of A

Both are true and the reason gives the mechanism. The pair differs spectrally, and that difference is a property of the colourants themselves. Assessing under a different light changes which illuminant the failure shows up under, not whether it exists - the only remedy that removes metamerism is changing the colourants.

Answer: D

The first two are correct and address the cause. The third addresses only the assessment, leaving the underlying property entirely unchanged. Only reformulation reduces the metamerism. Assessment cannot change the underlying property.