It’s a bit frightening what image processing “magic” can do to a picture:
And that’s not even advanced “magic” but some rather simple code written in Delphi (most of which I can’t publish here unfortunately).
What it does is:
- Smooth brigthness by applying a brigthness map.
- Adjust for lens edge blur by selective sharpening.
- Improve contrast by histogram stretching.
Of course since this is a gray scale picture, the processing is much simpler than it would be for colour pictures.