Starting with the RAW file, we made two conversions in Adobe Camera Raw. We added Contrast and Vibrance in the sky, and shifted the white balance toward yellow; for the ground, we lightened it overall, increased contrast with Curves, and added Fill Light and Clarity. We then combined the two in Adobe Photoshop CS5. For a richer sun, we cloned in yellow from elsewhere in the sky. It looks a little fake, but is less distracting. Finally, we cropped most of the tree at right.