How to make Pillow's getdata() return an array of RGB tuples for a pixel if the photo is black and white?

Question

Python

I'm converting the PIllow pixel array to a NumPy 3D array, and this code works fine with color images:

def PIL2array(img):
    np.array(img.getdata(), np.uint8).reshape(img.size[0], img.size[1], 3)

But when a black and white image is served, the following error is thrown:

ValueError: cannot reshape array of size 784 into shape (28,28,3)

The problem is that instead of three pixel colors, Pillow returns one. All resulting arrays must be of the same dimension. How can you make it so that you can get three colors for each pixel in the case of a black and white image?

Answer 1

And if you convert to RGB before that?

Answer 2

Everything is much simpler:
You can also put -1 instead of 3:

np.array(img.getdata(), np.uint8).reshape(img.size[0], img.size[1], -1)