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Messier 1 (Crab Nebula)


Messier 1 (Crab Nebula)

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 361 frames (3h)

Processing:

Siril 1.2.6:

Crop to 3600x2700px
BQ Octantis' technique of white balance, background subtraction, and histogram conditioning
StarNet++ star desaturation
GraXpert denoising
StarNet++:
- separation into stars and background
- background: generalized hyperbolic stretch, background extraction, saturation
- stars: Borodog's synthetic blue (B=2*G-R), modified arcsinh stretch, saturation

RawTherapee 5.11:

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

GIMP 2.10:

Luminance curve
Saturation






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