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colorjs.io

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Let’s get serious about color

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// More accurate color-difference formulae // than the simple 1976 Euclidean distance in CIE Lab import oklab from "../spaces/oklab.js"; import getColor from "../getColor.js"; export default function (color, sample) { [color, sample] = getColor([color, sample]); // Given this color as the reference // and a sample, // calculate deltaEOK, term by term as root sum of squares let [L1, a1, b1] = oklab.from(color); let [L2, a2, b2] = oklab.from(sample); let ΔL = L1 - L2; let Δa = a1 - a2; let Δb = b1 - b2; return Math.sqrt(ΔL ** 2 + Δa ** 2 + Δb ** 2); }