Hi Martin,
Hopefully the suggestions have cured the problem for you and we will soon get to see the result.
If for any reason it doesn't then when using WBPP and before selecting to run it, is their a note saying that "No Master Flat will be used to calibrate the frames." I very much doubt it as I am sure you would have rectified the issue, however, the result you show can be closely replicated if a flat is not being used. Very strange.
Cheers,
Ray
OMG...
After months of calibration issues I finally found the - stupid - error. And I have to admit that Ray was on the right track...
I used to cactivate the "CFA images" checkmark for the lightframes in WBPP, select the correct Bayer Pattern (RGGB) and then click "apply to all lightframes".
What I did not recognize all the time: you have to do the same thing for the flat frames as well?! How stupid is that? While the frames obviously have to be produced by the same camera, I assumed the "sophisticated PixInsight" SW would also automatically apply those settings to all relevant calibration frames... Oh boy, this took me uncounted hours and ours to figure out.
I only recognized the warning in WBPP that the flat frames didn´t match the darkframe time. OK, I knew that, sure. But I didn´t recognize there was no Flat calibration whatsoever being performed.
Hopefully somebody else can learn from my stupidness (or is it a bad GUI programming in PixInsight?) and doesn´t have to troubleshoot forever as I did...
Now I can re-do all my work and see where I´m going with that.
As a little christmal´s teaser you´ll find the christmas tree cluster from job 1932 ;-)
Happy holidays everybody!
CS
Martin
PS: Waiting for the big discussion about the new BlurXTerminator :-)