In reply to ablackett:
> It looks so natural I didn’t spot it at first. A fine piece of work, well done?
Up there with my best.
The photo is driving my potty - looking at the histograms, the change in the camera parameters isn't what I'd expect. I'm going to send it on to a fellow image-camera-obsessive and see what they think is going on. Some HDR compression as well as gain and offset changes at the very least.
I think that recovering properly it is going to need some sort of local histogram equalisation and then perhaps a re-application of a global luminance profile in the x-axis.
I had a really quick go at bodging a local histogram equalisation by doing sliding ones in the x-axis based on each of the top and bottom strips of the image and then blending vertically. Whilst the output is far from acceptable, I think it's got wings, but the initial histogram measurement needs to be delocalised with some sort of filter to avoid the banding and the vertical blending could have more zones. Once all that's done, someone more adept with photoshop retouching could mirror the sun and tidy up the spikes.
Edit: I'm doing this programatically; be really interested to see what can be achieved with Photoshop.
Post edited at 19:27