This tutorial builds on a previous post entitled "Build a Photo App with GPUImage". The previous lesson demonstrated how to use UIImagePickerController to select photos from the device's photo album or camera, how to add the GPUImage library to your project, and how to use the GPUImageFilter class to enhance still camera frames. If you're already familiar with UIImagePickerController and can figure out how to add GPUImage to your project on your own, you should be able to pick up from where the last tutorial left off just fine.


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