@Lee1 You may clone/heal beforehand; however, it is best to remove periodic artifacts (repetitive patterns) using Fast Fourier. The disadvantage is that you may potentially weaken real structures such as the fence, roof, pant legs and text; and introduce new distortions.
People mostly cover the stars and lines using solid or feathered black circles but I use clone/heal tools because, in attempt to reduce the possibility of introducing new distortions, I try to make the magnitude portion of the decomposition as close to its neighbourhood as possible.
Workflow FFT (polar) decomposition → remove all stars and lines except for central ones → re-composition → observe effect and adjust if necessary
@Reptorian Let’s try a trimmed mean instead. The trimmed median method is a riff off that and may not be as practical. (The earlier sample looks weird probably because I normalized it.)
@Reptorian This version uses the trimmed median’s second finest details scale to guide the trimmed mean’s finest. For a much higher cost, the returns are small.
You misread my post. None of the sample images are FFT-based restoration but rather trimmed median and/or trimmed mean.
This is from FFT restoration. I did this without clone/heal, only covering off-centre stars/lines. As you can see, doing so unfortunately weakens the subjects’ edges as well.
I’m working on the same problem. The best result was from the G’MIC “descreen” by Andreas Påhlsson. The preview showed an almost perfect result, but running the filter left vertical-line remnants not visible in the preview?
@Lee1 Please give FFT restoration a try and report back. If you are stuck along the way, we can give you pointers.
@okieman There is no way around the inaccurate preview. The only workaround I can think of is doing apply and checking to see if it looks okay in the host app; if not, undo, adjust parameters, then repeat.
BTW, if you want to explore, @Iain has a few restoration filters you may want to try.
I’m painfully new to this forum but have been on the hunt for a pattern removal tool for years. Iain - could you provide a link to your testing folder? I’ve downloaded Krita and tried to find the FFT filter mentioned I’m running a Silicon Mac & Photoshop. Thank you!
Hi Claes - thanks for the quick reply! I’ve looked around on the site you suggested and it looks like none of the solutions will work for me as I’m using a silicon mac. If you have any other ideas I would welcome them. Best, Lysa