So, any image of the kind that you see on the left, be it a real image or a synthetic image, it's made up of little regions that you see in the middle column, regions of different colors, different luminances.
看，你现在看到在左边任一种图像 不论是真的物体或者是人造的 都以小的区域构成 就是中间的这些小东西 这些区域有各式各样的颜色，光泽