Fireworks Galaxy (HaLRGB) (Linda)

Fireworks Galaxy (HaLRGB)

Link: https://lindasastronomyadventures.space/2021/08/18/fireworks-galaxy-halrgb/

Revision C was done in June 2023 applying new tools and techniques:

H:
dynamic crop
blurXterminator
starXterminator
noiseXterminator
GHS
pixel math from extracted RGB red channel to subtract red continuum

L:
dynamic crop
DBE
blurXterminator
starXterminator
GHS
HDRMT
LHE

RGB:
channel combination
dynamic crop
DBE
SPCC
blurXterminator
GHS
lrgbcombination in L
MLT (very mild sharpening)
curves (slight color reduction)
pixel math in stars (screen)

stars:
cloned L and RGB after blurXterminator steps
GHS each to level desired for stars
extract stars from both with starXterminator
LRGB combination L into RGB stars
unsharp mask (very mild sharpening)

Revision B is a reprocessing of the data to tame the dense star field. Here's what I did:

R, G and B:
dynamic crop
DBE

RGB:
channel combination
starXterminator (extracting stars)
histogram transformation
TGV denoise (chroma noise reduction)
channel combination in L
NBRGBCombination in Ha
curves for contrast
pixel math in stars

L:
dynamic crop
deconvolution
DBE
starXterminator
tgv denoise
histogram transformation
LHE
HDRMultiscaleTransform
MLT sharpening

Ha:
dynamic crop
deconvolution
starXterminator
tgv denoise
histogram transformation

stars:
histogram transformation

The Fireworks Galaxy (NGC 6946) got its name from the frequency of the supernova happening there (10 in the last hundred years according to Wikipedia). Those are some big fireworks!

The galaxy is located in a fairly dense star field making it a little challenging to process, especially since the galaxy has fairly low surface brightness.

Data was preprocessed using WBPP, the normalize scale gradients script and image integration.

Lum
dynamic crop
deconvolution
MLT noise reduction
histogram transformation

Ha
dynamic crop
deconvolution
MLT noise reduciton
histogram transformation

each R, G and B
dynamic crop
DBE

RGB
channel combination
MLT chrominance noise reduction
histogram transformation
LRGBCombination (adding in lum)
LHE (two scales)
Curves (contrast & color)
NRGBCombination (adding in Ha)
Curves (contrast & color)
Curves (slight boost to blue channel in the galaxy for the arms)
Star De-emphasizer script
Adv Sharpening script

Original
B
Final
C

B

Description: see main text for description

Uploaded: ...

C

Description: Reprocessed 2021 data with the *xterminators and better technique.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	7961106
PixInsight job	PW5KD3MYI56H4Q12BB9C6CK3B6ON5DGW
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h34m53s.800
RA (top/left)	20h33m45s.928
RA (top/right)	20h33m41s.674
RA (bottom/right)	20h36m02s.372
RA (bottom/left)	20h36m04s.978

Dec (center)	+60°08′26″.53
Dec (top/left)	+59°56′32″.85
Dec (top/right)	+60°19′58″.20
Dec (bottom/right)	+60°20′17″.38
Dec (bottom/left)	+59°56′51″.40

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