How can I highlight an image on an iPhone?

Posted by cometcomet on Stack Overflow See other posts from Stack Overflow or by cometcomet
Published on 2009-06-02T19:20:56Z Indexed on 2010/04/23 19:03 UTC
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I have a photo displayed on an iPhone. I would like to lower brightness of the photo at first, and when the user touches the photo, I would like to raise the brightness of the rectangular region near where the user touched, like this:

www.cottagearts.net/tut_images/tut_cropping_pse_06.jpg

Could anyone point me to a simple way of doing this?

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