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

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

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.deltaE = deltaE;
var _rgbToLab = require("./rgb-to-lab");
function deltaE(rgbA, rgbB) {
  var labA = (0, _rgbToLab.rgbToLab)(rgbA);
  var labB = (0, _rgbToLab.rgbToLab)(rgbB);
  var deltaL = labA[0] - labB[0];
  var deltaA = labA[1] - labB[1];
  var deltaB = labA[2] - labB[2];
  var c1 = Math.sqrt(labA[1] * labA[1] + labA[2] * labA[2]);
  var c2 = Math.sqrt(labB[1] * labB[1] + labB[2] * labB[2]);
  var deltaC = c1 - c2;
  var deltaH = deltaA * deltaA + deltaB * deltaB - deltaC * deltaC;
  deltaH = deltaH < 0 ? 0 : Math.sqrt(deltaH);
  var sc = 1.0 + 0.045 * c1;
  var sh = 1.0 + 0.015 * c1;
  var deltaLKlsl = deltaL / 1.0;
  var deltaCkcsc = deltaC / sc;
  var deltaHkhsh = deltaH / sh;
  var i = deltaLKlsl * deltaLKlsl + deltaCkcsc * deltaCkcsc + deltaHkhsh * deltaHkhsh;
  return i < 0 ? 0 : Math.sqrt(i);
}