Relative luminance of a #rrggbb color (WCAG formula, linearized). Used to pick a glyph color that survives its node fill: white vanished on the light half of okabe-ito (round-19 finding).
Relative luminance of a #rrggbb color (WCAG formula, linearized). Used to pick a glyph color that survives its node fill: white vanished on the light half of okabe-ito (round-19 finding).