This nebula is also known as IC 443 and Sh2-248. Decided to go for a spoopy looking palette on this in celebration of Halloween. My main complaint with this image is the large halo around Propus in my Ha frames, but I'm 97% certain it's caused by the AR window on my camera (gonna try to replace it at some point in the near future). [Also made a starless version](https://i.imgur.com/HlsYOwV.jpg) to better show the fainter nebulosity in the image. Captured over 6 nights in September and October, 2021 from a Bortle 6 zone.
**Places where I host my other images:**
[Instagram](https://www.instagram.com/leftysastrophotography/) | [Flickr](https://www.flickr.com/people/leftysastrophotography/)
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**[Equipment:](https://i.imgur.com/6T8QNsv.jpg)**
* TPO 6" F/4 Imaging Newtonian
* Orion Sirius EQ-G
* ZWO ASI1600MM-Pro
* Skywatcher Quattro Coma Corrector
* ZWO EFW 8x1.25"/31mm
* Astronomik LRGB+CLS Filters- 31mm
* Astrodon 31mm Ha 5nm, Oiii 3nm, Sii 5nm
* Agena 50mm Deluxe Straight-Through Guide Scope
* ZWO ASI-290mc for guiding
* Moonlite Autofocuser
**Acquisition:** 17 hours 5 minutes (Camera at Unity Gain, -15°C)
* Ha- 89x360"
* Oiii- 86x360"
* Darks- 30
* Flats- 30 per filter
**Capture Software:**
* Captured using [N.I.N.A.](https://nighttime-imaging.eu) and PHD2 for guiding and dithering.
**[PixInsight Processing:](https://www.youtube.com/watch?v=u7FuApFSGuA)**
* BatchPreProcessing
* SubframeSelector
* StarAlignment
* [Blink](https://youtu.be/sJeuWZNWImE?t=40)
* ImageIntegration
* DrizzleIntegration
**Linear:**
* DynamicCrop
* automaticBackgroundExtraction
* DynamicBackgroundExtraction
* EZ Decon + Denoise (per channel)
* STF applied via HistogramTransformaion to bring each channel nonlinear
**Combining Channels:**
* Pixelmath to make RGB image using dreamsplease's palette:
> R=iif(Ha > .15, Ha, (Ha\*.8)+(Oiii*.2))
> G=iif(Ha > 0.5, 1-(1-Oiii)*(1-(Ha-0.5)), Oiii *(Ha+0.5))
> B=iif(Oiii > .1, Oiii, (Ha\*.3)+(Oiii*.2))
**Nonlinear:**
* Extract synthetic lumance channel > LRGBCombination for chrominance noise reduction
* LRGBCombination with Ha as luminance
* Shitloads of CurveTransformations to adjust lightness, contrast, saturation, hues, etc.
* MultiscaleLinearTransform for noise reduction
* LocalHistogramEqualization
* More curves
* EZ Star reduction
* NoiseGenerator to add noise back into reduced stars
* Snother round of MLT
* Even more curves
* Resample to 60%
* Annotation
lefty7283
