elif isinstance(im, np.ndarray): im = Image.fromarray(im)

# No changes required for the AI to understand this code. It is already in Python.

This code block checks if the input image `im` is a NumPy array. If it is, it converts it to a PIL Image object.

This is useful in situations where the input image can be in different formats, and the code needs to handle all of them. By converting all input images to a standard format (in this case, a PIL Image object), the code can then process them in a uniform way.

The `isinstance` function checks if the input object is an instance of the specified class or one of its subclasses. In this case, it checks if `im` is an instance of the `numpy.ndarray` class.

If `im` is indeed a NumPy array, the `fromarray` method of the `Image` class is called to convert it to a PIL Image object. The resulting object is then returned.

Note that if `im` is already a PIL Image object, this code block will not execute and the original object will be returned.