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想要获得3张分别只有R\G\B通道值，另外两通道值为0的单通道图像。
可以调用 r = img.to_grayscale(rgb_channel = 1，copy=True) g = img.to_grayscale(rgb_channel = 2，copy=True) b = img.to_grayscale(rgb_channel = 3，copy=True)