meaning equal in lightness. Also, colors that may be isoluminant to the standard observer may not be isoluminant to a person with dichromacy.

Color tasks

Cole describes four color tasks, all of which are impeded to some degree by color blindness:
* Comparative - When multiple colors must be compared, such as with mixing paint
* Connotative - When colors are given an implicit meaning, such as red = stop
* Denotative -

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