The prolific Brad Larson released his new GPUImage Framework. While
Core Image on iOS 5 gives you a lot of neat capabilities, you’re unable to use
custom filters with it at the moment, and of course you’re out of luck if you
still need to support iOS 4.
That’s where GPUImage comes in. Brad’s done all the dirty work to wrap video
and image processing up in an easy to use library. You can write your own
custom filters in the OpenGL Shading Language and just load them in as
strings at runtime.
He’s included some great sample code of the filtering on real time video. I’ve
seen demos of his work when he presented at SecondConf in the past. He knows