@atlaskit/tokens/dist/es2019/utils/delta-e.js

Design tokens are the single source of truth to name and store design decisions.

import { rgbToLab } from './rgb-to-lab';
export function deltaE(rgbA, rgbB) {
  let labA = rgbToLab(rgbA);
  let labB = rgbToLab(rgbB);
  let deltaL = labA[0] - labB[0];
  let deltaA = labA[1] - labB[1];
  let deltaB = labA[2] - labB[2];
  let c1 = Math.sqrt(labA[1] * labA[1] + labA[2] * labA[2]);
  let c2 = Math.sqrt(labB[1] * labB[1] + labB[2] * labB[2]);
  let deltaC = c1 - c2;
  let deltaH = deltaA * deltaA + deltaB * deltaB - deltaC * deltaC;
  deltaH = deltaH < 0 ? 0 : Math.sqrt(deltaH);
  let sc = 1.0 + 0.045 * c1;
  let sh = 1.0 + 0.015 * c1;
  let deltaLKlsl = deltaL / 1.0;
  let deltaCkcsc = deltaC / sc;
  let deltaHkhsh = deltaH / sh;
  let i = deltaLKlsl * deltaLKlsl + deltaCkcsc * deltaCkcsc + deltaHkhsh * deltaHkhsh;
  return i < 0 ? 0 : Math.sqrt(i);
}