If I could get a $ for every time someone asked me this question, I’d be super rich with a Nikon D3X in my hands. But, unfortunately I don’t get a $ everytime someone asks me that question. Anywho, lately I’ve been processing in GIMP, mostly just focusing on light and contrast. This isn’t some big revelation tutorial but I think it works okay for adding a bit of contrast. It is literally a basic tutorial. You have to work with your photo. This tutorial might not be good if exposition is way too dark. Then you have to work on lighting up the dark parts.