Converts an image to grayscale using the crude average of the r, g, and b

def grayscale(image):
    width = image.get_width()
    height = image.get_height()
    newImage = pg.Surface((width, height))
    for y in range(height):
        for x in range(width):
            r,g,b = image.get_at((x,y))

            newImage.set_at((x,y), (int((r+g+b)/3), int((r+g+b)/3), int((r+g+b)/3)))
    return newImage