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用get.get_pixel(x,y)获取像素值，获得的值返回是None,这是为什么呢，整幅图像中有一部分是None,其他都是具体的数值，这是什么原因呢
如果涉及代码，需要报错提示与全部代码文本，请注意不要贴代码图片