def color_func(img, factor):
    """
    same output as PIL.ImageEnhance.Color
    """
    ## implementation according to PIL definition, quite slow
    #  degenerate = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)[:, :, np.newaxis]
    #  out = blend(degenerate, img, factor)
    #  M = (
    #      np.eye(3) * factor
    #      + np.float32([0.114, 0.587, 0.299]).reshape(3, 1) * (1. - factor)
    #  )[np.newaxis, np.newaxis, :]
    M = np.float32(
        [[0.886, -0.114, -0.114], [-0.587, 0.413, -0.587], [-0.299, -0.299, 0.701]]
    ) * factor + np.float32([[0.114], [0.587], [0.299]])
    out = np.matmul(img, M).clip(0, 255).astype(np.uint8)
    return out

    same output as PIL.ImageEnhance.Color
    
video_miniGPT4/minigpt4/processors/randaugment.py