title: Fastest framework for image processing
body: <p>I am developing something like painting app. There will be ability to draw on large images. I already have implemented this ability. Now I need to add ability for image processing (effects like: blur, hue, saturation, brightness, contrast, sepia...). That would be OK to do it with <code>CoreImage</code> framework, but I met one problem. All my painting and image drawing is based on OpenGL. And when I try to process image (apply effect on it) with core image and send it back to OpenGL to draw to screen I have some performance issues like <code>slow image processing</code> when trying to do it in real time. User moves slider and with slider position changes image gets updated. So if image is pretty big (for example 3200x2000), this action becomes slow. If image is smaller (for example 1500x1000) it works beautifully. So I came up with conclusion that it's framework's problem. If i'm wrong tell me. So what framework could I use for fast image processing? I found <code>vImage</code>, but as I can see, it does not have ability to apply such effects. Any suggestions?</p>