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Messier 31 (Andromeda Galaxy) in HaLRGB, Rupesh Varghese
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Messier 31 (Andromeda Galaxy) in HaLRGB

Messier 31 (Andromeda Galaxy) in HaLRGB, Rupesh Varghese
Powered byPixInsight

Messier 31 (Andromeda Galaxy) in HaLRGB

Equipment

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Acquisition details

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Description

Processing Info

The following steps were performed with the Ha, Lum, Red, Blue & Green stacked data:
  • Dynamic Crop
  • Linear Fit
  • Dynamic Backgroud Extraction

The following steps were performed to the Luminance data:
  • Deconvolution
  • EZ Denoise
  • Histogram Transformation (I intentionally clipped some of the data)

Once I had the gradients smoothed out, I started working on the Ha data to integrate that into my images. Here are the steps I took to isolate and then add the Ha.I created a new image by applying this formula to the Ha channel:
  • ((Ha*80)-(R*5))/(80-5)

I then went to the Red channel image and applied the following formula:
  • $T+(new_Ha-Med(new_Ha))*5

I then combined the Red, Green & Blue images using LRGB Combination. I did not use the Luminance data in this step. I then performed the following steps in PixInsight:
  • Background Neutralization
  • Photometric Color Calibration
  • EZ Denoise
  • Histogram Transformation
  • Extract CIE L* Compoment from RGB image.
  • LRGB Combination (CIE L* Component in L x 3)
  • Curves Transformation (Using a color mask from the R data)
  • SCNR (Removed Green)
  • Curves Transformation (x2 with range masks and then x2 with the same mask inverted)
  • Convolution
  • LRGB Combination (Using the Lum data)
  • HDR Multiscale Transformation
  • LRGB Combination (CIE L* Component in L x 2)
  • Star Mask
  • Morphological Transformation
  • Dark Structure Enhance
  • ICC Profile Transformation

This was annoyingly hard for me to process because of how large the target was and how many different components there are to this image. The dynamic range of the target did not help either. Regardless, this was a lot of fun for me to acquire and process. I hope to add more data to this over the next couple of years and see how much more detail I can extract out of this target.

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