Gloss effect like that images sent in native sms app?

I want a gloss effect like that images sent in native sms app, I saw that native sms app used开发者_开发知识库 a ImageBubbleMask and a ImageBubble to achieve the effect. Can anybody tell me how to do this? Any answer is appreciate.

Have a look at the following tutorial and see if it helps do what you're after? http://mobiforge.com/developing/story/sms-bubble-ui-iphone-apps