python - Smoothing banding noise of scanned photos

Question

I am trying to filter this kind of banding noise on dark areas of scanned images. I have already removed pattern noise with FFT filtering and applied some median filter. All the bright parts of the images look great, but darker patches look like this:

Is there anything that can be done to smooth these patches without losing detail in the brighter ones ?

Thanks.

question from:https://stackoverflow.com/questions/65836640/smoothing-banding-noise-of-scanned-photos

Answer 1

I have found that Neat Image software works very well at removing this type of noise:

Really worth the 35euros for this software.