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→ noti.st/cariefisher/Bin4xT

based on a drawing by Ramón y Cajal, 1911 by Anka Friedrich, vectorisation by chris 論, CC BY-SA 3.0

Diagram: cone types S, M, L x axis: Wavelength (nm) y axis: Normalized cone response (linear energy)

arithmetic mean L=(R+G+B)/3 L = 0.3333 R + 0.3333 G + 0.3333 B

weighted arithmetic mean L = 0.2126 R + 0.7152 G + 0.0722 B

relative luminance L = 0.2126 R + 0.7152 G + 0.0722 B

contrast ratio (L₁ + 0.05) / (L₂ + 0.05), where L₁ ≥ L₂

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