如果大家遇到这样的报错：

Exception in Tkinter callback
Traceback (most recent call last):
  File "E:\Anaconda3_files\lib\site-packages\PIL\Image.py", line 2515, in fromarray
    mode, rawmode = _fromarray_typemap[typekey]
KeyError: ((1, 1, 3), '<f8')

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "E:\Anaconda3_files\lib\tkinter\__init__.py", line 1705, in __call__
    return self.func(*args)
  File "D:\Junior Spring\Digital Image Processing and Experiment\数字实验备份\结课实验\ImgProcessing.py", line 806, in Sobel_Sharpening
    image = ImageTk.PhotoImage(Image.fromarray(img))
  File "E:\Anaconda3_files\lib\site-packages\PIL\Image.py", line 2517, in fromarray
    raise TypeError("Cannot handle this data type")
TypeError: Cannot handle this data type

网上很多教程的方法我也试过，没有用，也调试不出为什么
这里有个很关键的信息：Cannot handle this data type
说明是数据的类型错了，但再三检查后，明明就是带入的<class ‘numpy.ndarray’>类型
所以，大坑来了
请仔细检查自己array里面每个数的类型，它必须是<class ‘numpy.uint8’>，否则就会报错
可以这样改：

dst = dst.astype(np.uint8)
image = ImageTk.PhotoImage(Image.fromarray(dst))