说明：  图像光照补偿算法, 参考白 算法。将整个图像中所有像素的亮度从高到低进行排列，取前5 的像素，如果这些像素的数目足够多（例如》100），就将它们的亮度作为参考白，将它们的RGB分量都调整为最大255；其他像素点的色彩值也按这一尺度调整。
(Image illumination compensation algorithm, " reference white" algorithm. The brightness of all pixels in the entire image are arranged high to low, taking the top 5 of the pixels, if the number of these pixels enough (e.g., " 100), which will be used as reference white luminance, the RGB components thereof are adjusted to a maximum of 255 other pixel color values ​ ​ according to this scale also adjusted.)