Added some sulfur-II data to my [bicolor pic of this from last year](
https://www.astrobin.com/1gcfis/). I had to do a heavy crop in on the nebula since my camera's [rotation was off compared to last year](
https://i.imgur.com/4IeCBOo.png). Really happy with how the colors turned out on this one (and the much improved noise reduction). Captured on October 9th, 10th, and 17th, 2019 from a bortle 7 zone, and October 3rd and 5th, 2020 from a Bortle 6 zone.
**PixInsight Processing:**
* BatchPreProcessing
* SubframeSelector
* StarAlignment
* [Blink](
https://youtu.be/sJeuWZNWImE?t=40)
* ImageIntegration
* DrizzleIntegration (2x, VarK=1.5)
**Linear:**
* DynamicCrop
* AutomaticBackgroundExtraction
* [EZ Decon and Denoise](
https://darkarchon.internet-box.ch:8443/) (Ha only)
* STF applied via HistogramTransformation to bring each channel nonlinear
**Combining Channels:**
* PixelMath to make classic SHO to RGB image
* Greens and magentas nuked using SCNR
* Pixelmath to make RGB image using [ForaxX's palette](
https://thecoldestnights.com/2020/06/pixinsight-dynamic-narrowband-combinations-with-pixelmath/)
> R= (Oiii^~Oiii)*Sii + ~(Oiii^~Oiii)*Ha
> G= ((Oiii*Ha)^~(Oiii*Ha))*Ha + ~((Oiii*Ha)^~(Oiii*Ha))*Oiii
> B= Oiii
* Pixelmath to blend classic and ForaxX SHO images 50:50
**Nonlinear:**
* LRGBCombination with Ha as luminance
* Shitloads of [Curve](
https://i.imgur.com/925gdct.jpg)Transformations to adjust lightness, saturation, contrast, hues, etc
* ACDNR
* LocalHistogramTransformation
* DarkStructureEnhance
* More curves
* EZ Star Reduction
* Resample to 75%
* Annotation
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