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First attempt at Rosette nebula using HOO palette - seeking feedback

Siril Team Siril Processing Stacking HOO Narrowband Beginner Request for feedback Deep Sky Emission Nebula
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WILLIAM MEAD avatar
WILLIAM MEAD avatar

i would welcome comments on my Rosette nebula

1 ½ hours 3 min subs 100 gain, stacked in Siril, then using Pixel maths to get the HOO palette. This is my first attempt.

Stacked > Colour Calibration > StarNet > RGB split > Combine B&G/2 = G, then rejoin in PixelMaths, edit in Lightroom, Gimp to add stars back then final lightroom to finish and crop.

MC2600Pro FF107 & Reducer AM5N IR Cut PHD2 Sharpcap but stacked in Siril.

📷 best yet 2 -4.jpg I have had a few attempts, some have come out over processedbest yet 2 -4.jpg

Kristof Vandebeek avatar
Kristof Vandebeek avatar
A few comments:
  • It could use more integration time to increase the S/N ratio making the image less noisy and perhaps sharper
  • Color balance is personal, but I don’t really like the blue tone of the background (eg: in the 4 corners)
  • Stars in the left bottom corner appear to be elongated (noticed just by looking quickly)
  • I’d add RGB stars instead of the white stars that you have now
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Ian McIntyre avatar
Ian McIntyre avatar
Echo Kristof's assessment. Particularly with the bluish background. I don't mind it so much in the main nebulosity, but it really makes the background muddy. And having used that camera for some time, I can assure that a lot more integration time up front will help improve the result/post-processing time ratio.
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bigCatAstro avatar
bigCatAstro avatar

The Rosette is a tough one to process and it’s also one of those objects that gets processed in so many different ways, including in HOO alone. More time will certainly help the image, but I am very impressed with you have with only 1.5 hours. Hats off to you!

I also agree, there is a blue cast/tinge to the image, so perhaps you’ll need to take a look at your processing steps and see if you can tweak them a bit for a more neutral background. I noticed that you weren’t using a dual narrowband filter, so perhaps that could help to get a better capture of the Ha and OIII wavelengths.

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