Thanks for sharing your data, Carole!
Here is my attempt. I am very new to multi-channel narrowband processing. I spent a lot of time trying different palettes. I finally settled on H-HO-O.
After a very basic noise reduction using ATrous Wavelet Transform, I did a Masked Stretch on each image. I don't like doing background extractions on images that are mostly nebula, because they lose too much data.
For the narrowband data, I did a Linear Fit, then used those three images to try the various palette combinations, including SHO, Hubble (modified SHO), CFHT (HOS) and a few others. As I said, I settled on the H_HO_O palette.
I used Starnet++ to remove the stars, then did a bit of contrast tweaking with Curves and sharpening with ATrous Wavelets. I finished up the nebula with a pass of ACDNR noise reduction.
With the
RGB data, I used Starnet++ to extract the stars. I did a Morphological Transform to reduce the star sizes, followed by Curves to adjust their brightness and saturation.
Finally, I used Pixel Math to combine the nebula and stars. The last step was to reduce the image size and convert to jpg for posting.
I couldn't find a way to reduce the star haloes, which escaped Starnet++ and ended up in the narrowband image. Had they been on a dark background, I might have tried harder to reduce them, but with bright nebula as the background, I thought it prudent to leave them alone.
DSO AP: Orion 200mm f/4 Newtonian Astrograph; ATIK 383L+; EFW2 filter wheel; Astrodon Ha,Oiii,LRGB filters; KWIQ/QHY5 guide scope;
Planetary AP: Celestron C-11; ZWO ASI120MC;
Portable: Celestron C-8 on HEQ5 pro; C-90 on wedge; 20x80 binos;
Etc: Canon 350D; Various EPs, etc.
Obs: 8' Exploradome; iOptron CEM60 (pier);
Helena Observatory (H2O) Astrobin