counter-color/lib/luminance.js

Helps to determine what color of text goes best for a given background, light or dark (and vice versa).

import { sRGB, toRGB } from "./rgb";
export function colorLuminance(color) {
    const [r, g, b] = sRGB(toRGB(color));
    return 0.2126 * r + 0.7152 * g + 0.0722 * b;
}
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