Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  Bubble nebula  ·  NGC 7635  ·  Sh2-162
NGC 7635, Colin McGill
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NGC 7635

NGC 7635, Colin McGill
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NGC 7635

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Description

An Ha RGB image of the bubble nebula. Although I had great masters for each filter, I was finding it difficult to get a good final image. The problem was close to the blue bright stars - the star halos are a lot smaller in the Ha image, so there was a blue colouration near the stars which was oversaturated and looked out of place.

I used a technique from last week's PixInsight course - I created a Luminance image from the RGB data, stretched it, and subtracted the stretched Ha image. This creates high values just around the stars. You can then use this as a mask while performing LRGB combination to protect the RGB image in the haloes. This gives a more natural image, reducing the artifacts near the stars.

Also loaded the Ha image, since I like that too.

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    NGC 7635, Colin McGill
    Original
  • NGC 7635, Colin McGill
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NGC 7635, Colin McGill