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Everytime he said "context", he should have said "contrast".

He also didn't mention that grey is dark white, by the same phenomenon.

And of course red is dark pink, for rooster teeth fans.

Well, Contrast is usually in parlance as extremes. I think he means in context of what else is in the image, not just contrast. For example, you can have a "dark green" and "dark orange" used in a graphic of a tree on a black background, and you would perceive it as brown due to the context of the "tree-ness" on your screen.

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