Delphi:RGB亮度调节，Delphi实现图像RGB亮度调节，像PhotoShop那样调整图像的亮度。对每个象素点的R、G、B分量进行调节，不能越界，限制在0～255。

-Delphi: RGB brightness adjustment, Delphi realize RGB image brightness adjustment, so adjust the brightness of the image like PhotoShop. For each pixel of R, G, B component of adjustment, not out of range, limited to 0 to 255.