M1 Crab nebula in HOO+RGB (rbarbout)

M1 Crab nebula in HOO+RGB

The Crab nebula (Messier 1) under full moon.
The L-Ultimate did a great job here.
The nebula is in HOO while the stars are in RGB.
This is a cropped version of a wider field from my 750mm focal length.
Fortunately, the bayer-drizzle x2 allowed to recover some détails.

Date : february 7-8 2023
Neb : HOO 40x300s (3h20), Gain 121, Offset 10, Temp. -10°C
Stars : RGB 20x30s (0h10), Gain 121, Offset 10, Temp. -10°C
DOF : 90 Darks, 11 Flats, 90 DarkFlats
Camera : ZWO ASI294MC pro + Optolog L-Ultimate + ZWO filter drawer
OTA : Newton SW 150/750 + GPU coma corr.
Mount : SW HEQ5 pro Goto
Guide : ZWO ASI290MM + ZWO OAG + ZWO Helical Focuser
Aquisition : APT 3.98.1 + PHD2 2.6.11 (with dithering)
Processing : Pixinsight 1.8.9 (bayer drizzle x2) + GraXpert + Gimp 2.10 + DXO Photolab 4

Preprocess in bayer-drizzle x2

stars processing:
GraXpert
ImageSolver script
SPCC
Repaired HSV Separation script
StarAlignment (on HOO image)
BXT
NXT
HistogramTransformation
NXT
LRGBCombination with L only and Sat. = 0.3
Invert
SCNR
Invert
HistogramTransformation
CurvesTransformation

Pixinsight nebula processing:
DynamicCrop
ABE 1 sub
ABE 4 div
ImageSolver script
SPCC Narrow Band
BXT
SXT
Generalized Hyperbolic Stretching pixelmath by Bill Blanshan
HistogramTransformation
LRGBCombination with L only and Sat. = 0.4
CurvesTransformation with redMask
CurvesTransformation with cyanMask
CurvesTransformation
extract Luminance
pixelmath+rangeMask on Lum = 0.4*Lum+0.3*HDRMT7+0.2*HDRMT6+0.1*HDRMT5
UnsharpMask+rangeMask on Lum
LRGBCombination with HDRMT+sharpened Luminance

Boost with DXO Smart Lightning = 20
Background Clean-up with Gimp Heal selection

Nebula + Stars combination:
RGB Stars-to-Narrowband Transfer pixelmath by Bill Blanshan
NXT with mask=inverse Lum

	Distinct awarded users	Total awarded images
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	Image of the day	Top pick	Top pick nominations	Total submitted
Deep sky
Solar system
Extremely wide field
Star trails
Northern lights
Noctilucent clouds
Landscape

	Image of the day	Top pick	Top pick nominations	Total submitted
Backyard
Traveller
Own remote observatory
Amateur hosting facility
Public amaeteur data
Professional, scientific grade data
Mix of multiple sources
Other
Unknown

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Status	Basic success
Started	...
Astrometry.net job	7176716
PixInsight job	n/a
PixInsight queue size	n/a
PixInsight stage	n/a

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M1 Crab nebula in HOO+RGB

M1 Crab nebula in HOO+RGB

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M1 Crab nebula in HOO+RGB

M1 Crab nebula in HOO+RGB

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