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Are there logical relations between colors? For instance, is it logically true

Are there logical relations between colors? For instance, is it logically true that red and blue make purple?

Perceived color is a matter of retinal and neurological processing. People with full color vision see a variety of spectral inputs (from single frequency to mixed frequencies) as purple. Perhaps you are asking, could people who perceive red and blue normally see a mixture of red and blue as anything other than purple (in the same circumstances)? I don't think there are any cases of this kind of odd color perception, so it may well be that our 3-sensor color perception system will always perceive a mixture of red and blue as purple. Does that mean it is a "logical truth" that red and blue make purple? Only in the same sense that it is a logical truth that if you can hear the note A and hear the note C you will hear the combination as a minor third.

Perceived color is a matter of retinal and neurological processing. People with full color vision see a variety of spectral inputs (from single frequency to mixed frequencies) as purple. Perhaps you are asking, could people who perceive red and blue normally see a mixture of red and blue as anything other than purple (in the same circumstances)? I don't think there are any cases of this kind of odd color perception, so it may well be that our 3-sensor color perception system will always perceive a mixture of red and blue as purple. Does that mean it is a "logical truth" that red and blue make purple? Only in the same sense that it is a logical truth that if you can hear the note A and hear the note C you will hear the combination as a minor third.