I don’t have any code. I just play around with Gimp to understand how the filters work.
Sadly the pixels are OFF. The contrast setting is much too high. I know that, but that’s the settings our “experts” are using.
I hope that I can change that in the near future. I see there is room for improvement, but I have to learn more about image processing. That’s why I try to get the best out of the current images.
Btw: I have some good results using a combination ob Sobel X and Y (in Gimp G’mic). This removes the grid and the gradient. But there are still too many artefacts especially at the bottom side. I will upload some examples later.