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24 ways to impress your friends

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Alan Hogan

The 50% algorithm is incorrect and, as other commentors note, basically only considers red.

The test colors are flawed, too; they are all completely saturated (or exactly grey). This means that even an incredibly naïve algorithm like the 50% one will always have contrast simply because both white and black always contrast against saturated colors — and because when r = g = b (grey) then it doesn’t matter if red is over-represented.

I really feel the article needs updated to reflect this. It’s that big a deal, and I think 24 Ways commands enough respect that readers expect/deserve a correction.