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A comment on Tetrachromats: people who see colors invisible to most of us (2014). Parent comment

Re:Tetrachromats: people who see colors invisible to most of... by OscarCunningham on Sunday November 17, 2019 @11:56AM (#21558721)
If you wanted to measure it in a principled way you could count how many colours they could distinguish. https://en.wikipedia.org/wiki/MacAdam_ellipse
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