[开源]Qt图片调整之饱和度调节

原理较简单不作详述

 

QImage AdjustSaturation(QImage Img, int iSaturateValue)
{
    int red, green, blue, nRed, nGreen, nBlue;
    int pixels = Img.width() * Img.height();
    unsigned int *data = (unsigned int *)Img.bits();

    float Increment = iSaturateValue/100.0;

    float delta = 0;
    float minVal, maxVal;
    float L, S;
    float alpha;

    for (int i = 0; i < pixels; ++i)
    {
        nRed = qRed(data[i]);
        nGreen = qGreen(data[i]);
        nBlue = qBlue(data[i]);

        minVal = std::min(std::min(nRed, nGreen), nBlue);
        maxVal = std::max(std::max(nRed, nGreen), nBlue);
        delta = (maxVal - minVal) / 255.0;
        L = 0.5*(maxVal + minVal) / 255.0;
        S = std::max(0.5*delta / L, 0.5*delta /