Marc, Unlinking like in unlinked stretch is bad practise I think if you want to have good control over your star colours.
Detoxing from PI ? …
If you run this image in the mentioned LP correction, you’ll immediately see that the tool will neutralize your background, so you can do an efficient LP correction and background calibration ( or vignette correction or background calibration). Once you have set the area selectboxes, and have clicked on calculate, your image will be background calibrated as well, as shown in het image viewer.
Indeed, I forgot, I can always adjust my boxes after the first background calibration.
Thanks for your explanation.