import numpy as np


def to_numpy(pil_img):
    np_img = np.array(pil_img, dtype=np.uint8)
    if np_img.ndim < 3:
        np_img = np.expand_dims(np_img, axis=-1)
    np_img = np.rollaxis(np_img, 2)  # HWC to CHW
    return np_img