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ACQUISITION DETAILS
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Target: Christmas Tree Cluster & Cone Nebula (NGC 2264)
Camera Gain: 100
Camera Temperature: -10 C
Exposure: 30 s
Focal Length: 1067 mm
Aperture: f/6.3
Integration Time: 1h 30m
Total Frames: 180

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EQUIPMENT
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Camera: ZWO ASI533MC-Pro
Filter: ZWO UV/IR Cut
Telescope: Celestron NexStar 6SE
Focal Reducer: Celestron f/6.3 Reducer Corrector
Mount: ZWO AM5
Tripod: ZWO TC40

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POST-PROCESSING WORK FLOW
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Siril IC
1. Project Properties: Multi-Session w/ Equalize (CFA)
2. Files: Image; Dark (x30 @ 30s); Flat (x30 @ 3s); Dark-Flat (x30 @ 3s)
3. Image Properties
3a. Stack: Mean
3b. Rejection Type: Winsorized
3c. Weighing: WFWHM
3d. Normalisation: addscale

PixInsight
1. Process: DynamicCrop (remove borders of image that didn't contain stars on every subframe due to dithering - 3100x3100 to 2934x2941)
2. Script: ImageSolver
3. Process: BlurXTerminator (version 2.0.0, AI version 4 - Correct Only)
4. Process: DynamicBackgroundExtractor (1st Pass: Division; 2nd Pass: Subtraction)
5. Process: SpectrophotometricColorCalibration (Defaults)
6. Process: BlurXTerminator (version 2.0.0, AI version 4 - Defaults)
7. Process: StarXTerminator (Generate Star Image & Unscreen Stars checked)
8. Process: GeneralizedHyperbolicStretch (several iterations of stretches on starless image to highlight nebulae)
9. Process: GeneralizedHyperbolicStretch (1 iteration of stretches on star mask image)
10. Process: PixelMath (combine stretched starless image & star mask) -- Expression: ~((~starless)*(~star_mask))
11. Process: SCNR (Color to Remove: Green; Protection Method: Average Neutral; Amount: 0.50)
12. Process: NoiseX (Denoise: 0.75; Detail: 0.15)
13. Process: ICCProfileTransformation (Convert to profile = sRGB IEC61966-2.1)

GIMP
1. Levels (adjust black level to make background sky darker)
2. Saturation (Scale: 1.25)
3. Crop (2934x2941 to 1900x2850 to center object)
4. Scale (1900x2850 to 1600x2400 @ 72 dpi; Interpolation: Cubic)