I was very grateful for the balanced and honest feedback you gave me in my previous post (DSS vs Siril), so I thought I pursue that line.
After stacking with Siril, applying the wonderful photometric color calibration, asinh stretch (1000) and the default deconvolulation, I imported to GIMP in tif format:
I then only applied 2 commands, I raised the black level to well below the histogram (no clipping, I hope):
And then I applied an s-curve to brighten the brightest parts, while leaving the background untouched:
This was the result:
While I obviously need to fix my collimation, I look forward to your candid comments and maybe any suggestions on what more I could do to improve the image.
DSLR: Nikon D5000,
Frames: 60 x 180 secs @ ISO 1600 & temp 284-5 K
Darks: 40 x 180 secs @ ISO 1600 & 288 K
Biases: 100 @ ISO 1600
Flats: 100 @ ISO 100 (Minus flat-biases also @ ISO 100)
Celestron C8-N with goto mount & FL 1000 mm
Guided with QHY5 and guidescope FL 327 mm