Preprocess a RGB image to feed it to a neural net

image_preprocessing.py

def preprocessImage(image, width, height):
    """
    Preprocessing script to convert image into neural net input array
    :param image: (cv2 RBG image)
    :param width: (int)
    :param height: (int)
    :return: (numpy array)
    """
    image = cv2.resize(image, (width, height), interpolation=cv2.INTER_LINEAR)
    x = image.flatten()  # create a big 1D-array
    # Normalize
    x = x / 255. # values in [0, 1]
    x -= 0.5 # values in [-0.5, 0.5]
    x *= 2 # values in [-1, 1]
    return x