First message here, I hope I follow the rules for posting.
I use RawTherapee for demosaicing astrophotos.
I have 5 dark-frames that I took right-after the star images : same ISO, same camera, same exposure duration and almost same time (less than a minute difference).
If I select one of them as a Dark-Frame, I can see at zoom level = 100% that it actually worsens the “noise”.
So I hoped that by using the Auto-selection tick box, RawTherapee would average my 5 dark-frames and subtract this average dark-frame to my star picture.
However, it seems to me that only 1 dark-frame is selected (see attached screenshot).
How can I force RawTherapee to average my 5 dark-frames ?
I know that I could create an average dark-frame (or “master dark”) with astro-programs like Siril, but they produce a .tiff file that cannot be subtracted to my raw photo in Rawtherapee. I have already tried, but no effect at all is visible. Perhaps RawTherapee detects the dimension, color space and/or CFA are different and as a result abort the dark-frame subtraction.