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Messier 46 and NGC 2438


Messier 46 and NGC 2438

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 173 frames (1h 26m)
Nearly full Moon

Processing:

Siril 1.2.4:

Crop to 4000 x 3000px
BQ Octantis' white balance, background subtraction, and histogram conditioning
GraXpert denoising
Star desaturation
StarNet++ star removal
Background:
- Generalized hyperbolic stretch
- Black point
- Modified arcsinh stretch
- Background extraction
- Histogram adjustment
Stars:
- Borodog's synthetic blue (B=2*G-R)
- Modified arcsinh stretch
- Saturation

RawTherapee 5.11:

L*a*b* chrominance/luminance noise reduction
Luminance noise reduction

GIMP 2.10:

Luminance curve
Saturation
Black point






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