Why are there always 2 possibilities for one illuminant?

Article Number: 509
Created On: 2010-03-08 6:47 PM
Author: Datacolor [RMertens@datacolor.com]

URL : http://knowledgebase.datacolor.com/question.php?ID=509

Each illuminant is defined for 2 standardized observers, which can be 2° or 10°. The angles are related to the different sizes of the observer’s field of view.

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