The Bubble Nebula in SHO Hubble Palette (Josh Woodward)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: Bubble nebula · NGC 7635

The Bubble Nebula in SHO Hubble Palette, Josh Woodward

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The Bubble Nebula in SHO Hubble Palette

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The Bubble Nebula in SHO Hubble Palette

This is my fifth iteration of trying to create a satisfying Hubble Palette image of the Bubble Nebula.

I first registered the the images to Ha using Star Alignment. I then used Dynamic Crop to clip off stacking artifacts and coma in the corners. Next, I used Linear Fit to with Ha as the reference to calibrate SII and OIII. I then used ABE separately on OIII, Ha, and SII. I then combined the images using PixelMath.

With this version I went with a PixelMath combination of:

Red - SII * 0.8 + Ha*0.2

Green - Ha*0.85 + OIII*0.15

Blue - OIII*0.9 + Ha*0.1

I then did a 90% SCNR to remove the remaining green cast

I was having problems with a purplish background until I used Background Neutralization..

SHO images tend to err towards green because Ha overwhelms OIII and SII. To combat this, I adjusted the green hue towards orange/yellow using Curves hue adjustment. I then used Jon Rista’s NR techniques with TGV Denoise and MMT.

I stretched the image using Histogram. I used ACDNR to with a strong mask to remove the “black tail”. I used a mild Color Saturation to boost the color paying special attention to the light blue of the “Bubble”. I used HDRMT to draw out hidden details. Then Morphological Transformation to reduce star size. Lastly, I used Curves for sight contrast and saturation enhancements.

Cloudy Nights
Schmidt-Cassegrain Telescope (SCT) Imagers
ZWO ASI1600MM/QHY163M

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Status	Basic success
Started	...
Astrometry.net job	2885559
PixInsight job	n/a
PixInsight queue size	n/a
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The Bubble Nebula in SHO Hubble Palette

The Bubble Nebula in SHO Hubble Palette

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The Bubble Nebula in SHO Hubble Palette

The Bubble Nebula in SHO Hubble Palette

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