多项选择题
A.127.0.0.1B.120.34.0C.21.18.33.48D.202.256.97.0
A.2n-3B.2n-2C.2n-1D.2n
A.alpha蒙版B.alpha反转蒙版C.亮度蒙版D.亮度反转蒙版