操作方法
Alpha = 0 ~ 100 R = ( R1 * (100 - Alpha) + R2 * Alpha ) / 100 G = ( G1 * (100 - Alpha) + G2 * Alpha ) / 100 B = ( B1 * (100 - Alpha) + B2 * Alpha ) / 100 示例： RGB1 ( 232, 54, 13 ) RGB2 ( 94, 186, 233 ) Alpha = 30 R = ( 232 * 70 + 94 * 30 ) / 100 = 190.6 -> 190 G = ( 54 * 70 + 186 * 30 ) / 100 = 93.6 -> 93 B = ( 13 * 70 + 233 * 30 ) / 100 = 79 Alpha = 50 R = ( 232 * 50 + 94 * 50 ) / 100 = 163 G = ( 54 * 50 + 186 * 50 ) / 100 = 120 B = ( 13 * 50 + 233 * 50 ) / 100 = 123
32位色下的颜色混合 R = R1 * Alpha1 + R2 * Alpha2 * (1-Alpha1) G = G1 * Alpha1 + G2 * Alpha2 * (1-Alpha1) B = B1 * Alpha1 + B2 * Alpha2 * (1-Alpha1) Alpha = 1 - (1 - Alpha1) * ( 1 - Alpha2) R = R / Alpha G = G / Alpha B = B / Alpha
R1、G1、B1、Alpha1指上层的颜色值 R2、G2、B2、Alpha2指下层的颜色值 R、G、B、Alpha指合并后的颜色