Lab Delta E

LabDeltaE.cs

public static float LabDeltaE(Lab labA, Lab labB)
{
    var deltaL = labA.L - labB.L;
    var deltaA = labA.a - labB.a;
    var deltaB = labA.b - labB.b;
    var c1 = Mathf.Sqrt(labA.a * labA.a + labA.b * labA.b);
    var c2 = Mathf.Sqrt(labB.a * labB.a + labB.b * labB.b);
    var deltaC = c1 - c2;
    var deltaH = deltaA * deltaA + deltaB * deltaB - deltaC * deltaC;
    deltaH = deltaH < 0 ? 0 : Mathf.Sqrt(deltaH);
    var sc = 1.0f + 0.045f * c1;
    var sh = 1.0f + 0.015f * c1;
    var deltaLKlsl = deltaL / (1.0f);
    var deltaCkcsc = deltaC / (sc);
    var deltaHkhsh = deltaH / (sh);
    var i = deltaLKlsl * deltaLKlsl + deltaCkcsc * deltaCkcsc + deltaHkhsh * deltaHkhsh;
    return i < 0 ? 0 : Mathf.Sqrt(i);
}