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Bubble Nebula from the 2017 Apparition

Since I was busy moving homes in 2017, I never had the chance to process much data from that year.  This Bubble Nebula data looked promising, so I processed it.  I chose a composition that focused on the bubble and surrounding gas and dust pillars and cropped out most of the remaining molecular cloud.  Details at:

Did anyone else post this data?

Clear skies,


Uploaded files:
  • SHO_clone_Preview05_r1.jpg

Making use of SCNR?  After an SHO combination in PI?


Eventually, yes. Hope I wasn't breaking any processing laws.

High level steps:

straight SHO channel combination (no Pixel Math proportioning)

Extract L for later recombination

SHO Histogram stretch based on unlinked auto STF

Hue shift with Curves Transformation (something I found in someone's YouTube video)

then SCNR

Invert (magenta star halos become green)

SCNR again

Invert (magenta star halos gone) - also learned from someone else

CIE lab Channel combination with synthetic luminance made with linear SHO data (L was deconvoluted, MLT noise removal, ArcSin stretched twice, and MLT sharpened in the 2nd wavelet layer - with some deringing support and other masks involved). I know ArcSin stretch was meant for protecting star color but sometimes it protects the L highlights better than HT.

And touch up with some TGVD in L and Chrominance (the Vicent Peris approach)

So there's my lazy man's approach to SHO color.  Other than some saturation and contrast adjustments, it's the same approach I used for Melotte 15.