Method igamma

libraries/rainbow/src/rainbow.cpp:205–208

        return pow(normalize(n), 2.2);
    }
    static qreal igamma(qreal n)
    {
        return pow(normalize(n), 1.0 / 2.2);
    }
    static qreal lumag(qreal r, qreal g, qreal b)
    {
        return r * yc[0] + g * yc[1] + b * yc[2];