Mix Lab

mixLab.c

shader mixLab(
    color A = 0.0,
    color B = 1.0,
    float T = 0.5,
    color LB = 0.0,
    color UB = 1.0,

    output color Color = 0.5) {

    color aLinear = sRgbTolRgb(A);
    vector aXyz = lRgbToXyz(aLinear);
    vector aLab = xyzToLab(aXyz);

    color bLinear = sRgbTolRgb(B);
    vector bXyz = lRgbToXyz(bLinear);
    vector bLab = xyzToLab(bXyz);

    vector cLab = mix(aLab, bLab, T);
    vector cXyz = labToXyz(cLab);
    color cLinear = xyzTolRgb(cXyz);
    Color = lRgbTosRgb(cLinear);

    Color = clamp(Color, LB, UB);
}