def METHOD_NAME(image_list, opacity=0.5, blend_mode="multiply"):
    result = image_list[0] * 1.
    for i in range(1, len(image_list)):
        result[result[..., 3] > 0, 3] = 1
        layer = image_list[i] * 1.0
        layer[layer[..., 3] > 0, 3] = opacity
        result = blend([result, layer], blend_mode=blend_mode)
    return result