<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:

def save(self, fn:PathOrStr):
        "Save the image to `fn`."
        x = image2np(self.data*255).astype(np.uint8)
        PIL.Image.fromarray(x).save(fn)