求网胶褪色方案，如下图：

[img=,560,478]https://ng1.17img.cn/bbsfiles/images/2021/12/202112251654172598_9871_1827064_3.png!w560x478.jpg[/img][img=,680,586]https://ng1.17img.cn/bbsfiles/images/2021/12/202112251654172823_5328_1827064_3.png!w680x586.jpg[/img][img=,649,578]https://ng1.17img.cn/bbsfiles/images/2021/12/202112251655036592_5538_1827064_3.png!w649x578.jpg[/img]

想褪色后的颜色图片如下：

[img=,347,214]https://ng1.17img.cn/bbsfiles/images/2021/12/202112251655490155_7020_1827064_3.png!w347x214.jpg[/img]