Is this the effect you are after?

来源: 于 2010-02-13 10:57:43 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

1. Open tiger.jpg and put a circle filled with red color. Save as picture tiger2.jpg
2. Open seaside.jpg, insert tiger2.jpg, click "Set Transparent Color", then click the red circle.