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Messier 31 (Andromeda Galaxy)


Messier 31 (Andromeda Galaxy)

Acquisition:

Bortle 7 skies
Nikon D5600 camera (unmodified)
ISO 200
Astro-Tech AT102ED refractor, 714mm focal length, f/7
HoTech 2" SCA field flattener (1X)
iOptron CEM26 mount
30s x 377 frames (3h 8m)

Processing:

Siril 1.2.0:

Crop to 5800 x 3800px
Photometric color calibration
Background extraction
Star desaturation
StarNet++:
Background - Generalized hyperbolic stretch (3 times), histogram adjustment
Stars - Generalized hyperbolic stretch (3 times), histogram midpoint

RawTherapee 5.9:

L*a*b* CL curve (to reduce background chroma noise)
Luminance noise reduction

GIMP 2.10:

Luminance curve
Saturation
Temperature






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