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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 1.2.6:

Crop to 5200 x 3900px
BQ Octantis' technique of white balance, background subtraction, and histogram conditioning
StarNet++ star desaturation
GraXpert denoising
StarNet++:
Background
- generalized hyperbolic transformation stretch (2 times)
- background extraction
- generalized hyperbolic saturation stretch
Stars
- synthetic blue (pixel math to replace bloated blue channel): B=2*G-R
- modified arcsinh stretch (4 times)
- saturation

RawTherapee 5.11:

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

GIMP 2.10:

Luminance curve
Color balance (to reduce brown and magenta tints in brighter areas)
Saturation






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