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I was asked by my friend Matt if there was a way to fix stars in data that either have donuts or elongation in the corners. I asked Matt to send me some data to look at and I will show you the files he sent and the one I picked to work on. The images were captured from a Live Stack and saved as 8-bit TIF files. Once Matt started to process the data he converted them into 16-bit files. That is what he sent me.
As you will see, Siril can easily handle the out-of-shape stars and save his data. This process shown isn't perfect and there are still some other issues with the data. But the stars are now much better and I think he will approve of the fixes to the stars. Hope this video can help others who have non-linear data with similar problems so you too can fix your stars and save your data...