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metamerism index
degree of colour mismatch, calculated in the form of a colour difference, caused by substituting a test illuminant (observer) of different relative spectral composition (responsivity) for the reference illuminant (observer)
Note 1 to entry: The colour difference is evaluated using a CIE colour difference formula and it shall be clearly stated which formula has been used.
Note 2 to entry: This entry was numbered 17-770 in CIE S 017:2011.