how to sharp/blur an uiimage in iphone?

Question

I have a view with UIImageView and an UIImage set to it. How do I make image sharp or blur using coregraphics?

Answer 1

Apple has a great sample program called GLImageProcessing that includes a very fast blur/sharpen effect using OpenGL ES 1.1 (meaning it works on all iPhones, not just the 3gs.)

If you're not fairly experienced with OpenGL, the code may make your head hurt.