BOXCHAD

//Aqua: R: 235, G: 173, B: 219
//Ina iofi: R: 250, G: 199, B: 226
//Regular iofi: R: 250, G: 236, B: 236

/**
 * calculate the perceptual distance between colors in CIELAB
 * https://github.com/THEjoezack/ColorMine/blob/master/ColorMine/ColorSpaces/Comparisons/Cie94Comparison.cs
 *
 * @param {Array} labA First LAB color in array
 * @param {Array} labB Second LAB color in array
 */
function deltaE(labA, labB){
  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);
}

let aqua = [77.67, 29.83, -14.26];
let iofi_ina = [85.33, 22.31, -6.46];
let iofi_base = [94.47, 4.72, 1.68];

console.log(deltaE(aqua, iofi_ina));
console.log(deltaE(iofi_ina, aqua));
console.log(deltaE(iofi_base, iofi_ina));
console.log(deltaE(aqua, iofi_base));