Are a priori metrics in colorimetry meaningful?

摘要

"Are a priori metrics in colorimetry meaningful? " is a question that is rarely asked. Yet the choice of metric in the form of an inner product is of crucial importance in basic colorimetry. Is there an a priori unique choice ? The answer is no. One needs to opt for some choice of inner product on rational grounds that may differ from case to case. I discuss possible alternatives.