This mapped-color image represents the Sulfur emissions as Red, Hydrogen as Green, and Oxygen as Blue.

Equipment:  
OTA: William Optics GT81 w/0.8x reducer (382mm fl at f/4.7)
74mm aperture stop-down ring (brings scope to f/5.2)
Mount: Orion Sirius EQ-G (HEQ-5)
Guidescope: Orion 50mm guidescope
Guiding camera: Orion StarShoot Autoguider
Imaging camera: ZWO ASI1600MM-Cool

Accessories:
DeepSkyDad Autofocuser AF1
QHYCCD PoleMaster

Software:  
SGP
PHD2
PixInsight

Acquisition:  
Location:
Joshua, TX (Bortle 4)
Dates: 1/13/23, 1/18/23
Gain: 200 Offset: 50
Camera temp: -20C
Sii: 38x300" Astrodon 3nm 1.25" 
Ha: 38x300" Astrodon 5nm 1.25"
Oiii: 43x300" Astrodon 3nm 1.25"
Total integration time: 9hr 55min
Exposures for the core:
~60x15" per filter
~25x30" per filter
64x darks per calibration (master from library)
30x flats per calibration
200x bias per calibration (master from library)

Preprocessing:
Batch PreProcessing script to generate calibrated images
StarAlignment
ImageIntegration
2x DrizzleIntegration

Preparing masters for HDR (applied to all 9 exposure stacks):
DynamicCrop
DBE
BlurXTerminator
HDRComposition tool to generate an HDR master image for each filter

Luminance Processing:
Duplicated master Ha to use as the Luminance
ArcsinhStretch
HistogramTransformation
HDRMultiscaleTransform
Created a duplicate enhanced starless version using StarNet
Combined the starless version with the image using PixelMath expression "F=0.4; (1-(1-$T)*(1-s)*F)+($T*~F)". (s=starless photo)
LocalHistogramEqualization
MultiscaleLinearTransform
CurvesTransformation
HistogramTransformation
NoiseXTerminator
MorphologicalTransformation to slightly reduce stars
UnsharpMask to slightly sharpen stars
HistogramTransformation

Preparing separate Sii, Ha, and Oiii linear masters for tonemapping (applied to each master individually):
StarNet
NoiseXTerminator
ArcsinhStretch
HistogramTransformation
HDRMultiscaleTransform
Photoshop's Healing Brush tool to remove leftover star halos

Combined prepared Sii, Ha, and Oiii masters with ChannelCombination to create Tonemap:
R: Sii
G: Ha
B: Oiii

Tonemap Processing:
CurvesTransformation to stretch
Invert>SCNR>Invert to remove magentas
ColorSaturation
CurvesTransformation for core
CurvesTransformation with ColorMasks to adjust palette warmer

Combined Tonemap with Luminance using LRGBCombination:
CurvesTransformation to adjust contrast and balance background colors
NoiseXTerminator
Resampled to 30% for web posting