Every Pixinsight recommended workflow includes DBE/ABE as an initial step (after crop, still linear), but is it always helpful? It seems to make my images far worse, leaving defined gradients/streaks where background extractions were applied. I've spent many hours experimenting with every possible setting/amount and location of sample points, etc, but I always get poor results.
I usually don't have gradient issues to begin with, so is background extraction even necessary? Attached is an example of the effect I typically see (shown is a calibrated/stacked/cropped lum image). Am I doing something completely wrong? Setting anywhere from 5-500 background sample points I get similar effects... subtraction... regardless of normalize or any other setting.
I've found little/no official literature about DBE, so I'm not sure what exactly it's supposed to be correcting. I image from Bortle 5 - ~mag 20 skies... so it would be great if it magically cleared a layer of LP, but I'm not seeing any benefits from it.