[RCC] advice required on processing of nebula images Requests for constructive critique · Stuart Taylor · ... · 27 · 608 · 14

Manuel Peitsch:
Hi Stuart, I have played a bit with your original FITS file. I am also using APP. First, I have used crop and rotate under 9) Tools:


Then I have used 9) Tools - remove light pollution. Selecting just a few small areas in dark spots I got this result:


Then, I adjusted the contrast a bit (set to 0.05), leaving SAT.TH unchanged (you can play with these parameters to see what is best for your image):


Then in GIMP (not yet using PS), in Color-Curves, I adjusted the blackpoint (~15), and adjusted the curve to follow its original track:


At this stage to can, again in Colors-Curves adjust each color as you desire. Here is just an example with a slight increase in blue around the center of the curve (using multiple anchor points):


Hope this helps ...

All the best
CS
Manuel

Ola Skarpen SkyEyE:
My attemt
I have very little experience with color cameras. I got the best result when I split rgb before stretching. I stretched each channel separately, and merged them afterwards. Color calibrated manually (visually) Easy adjustment afterwards in PI.
Picture.2 More contrast