Hello, Lately I have seen a plethora of image editing/effects apps on the App Store and I have been curious about how this is done. I'm not actually interested in making my own -- just curious about the process as I am an OS X developer and not an iOS developer. In OS X I would go about making an editor/effects app using Core Image. As far as I know iOS Core Image isn't as developed as the OS X version (forgive me if I'm mistaken.) So are the photos in these apps being manipulated with OpenGL ES or are they actually being manipulated with Core Image. Again, just curious. Thanks.