[RCC] Rosette Nebula - Forums

Topic starter

Dec 15, 2024 · Edited: Dec 15, 2024

The image is an 6-hour integration of Rosette nebula taken in HO dual narrowband filter. Request your critique and feedback to improve it. I plan to add more data and revisit the processing shortly. I think the overall colour is not as good as it should be - some of the bias perhaps also comes from the general blueish colours of the nebula in a different palette.
The individual subs were 3 mins long, dithered every frame.

Workflow:
1. Background Neutralization
2. Gradient removal (Graxpert)
3. SPCC
3. BlurXT - (Note to self: Trial about to expire, need to play around with other tools too!!)
4. NoiseXT
4. Linked statistical stretch
5. Masked stretch
6. HDR Multiscale transformation (along with pixel math to avoid overdoing. i.e. I1=Original image, I2=Image after HDR Multiscale transformation, FinalImage=(I1+I2)*0.5
7. Unsharp Mask
8. NoiseXT - A very tiny bit to reduce noise brought in by Unsharp Mask
9. Curves adjustment

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D. Jung

Dec 15, 2024

It's a decent edit. Personally, I would push down the background a bit more, but that's a matter of taste.

You could also try:
1. Use deepSNR plugin to control the noise a bit better. Sometimes gives better results than noisex.
2. Gently apply local histogram normalization to enhance local contrast
3. The curves transformation tool has pages that allow shifting red, Red/blue and green/red. Masking the background you can use that to adjust the colors of you nebula.

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akshay87kumar

Topic starter

Dec 18, 2024 · Edited: Dec 18, 2024

D. Jung:
Gently apply local histogram normalization to enhance local contrast

This is second pass, with another 5 hours of data (Total ~10 hours now in Bortle 8). No success with HOO palette - it was too discoloured for me to even post! Looks like I need to get a good tutorial rather than just playing around with narrowband normalization plugin.
I think the background can still be made darker - there are patches in corners visible. However please do critique and provide feedback. Also, will gathering another night of ~4-5 hours of data be useful here, or too marginal to even notice?

patrice_so

Dec 18, 2024 · Edited: Dec 18, 2024

Hi,

This is a nice capture. However, I believe that you should balance the Ha and Oiii in such a way that the whole picture does not look only as shades of reds. There are two ways to go here :
i) extract Ha and Oiii layers using pixelmath, then use linear match to bring the Oiii to the required level.
ii) use the Narrowband normalisation process.

See mine here :
https://www.astrobin.com/wabsb8/C/
Or better here:
https://www.astrobin.com/kwehl3/C/?force-classic-view=

Clear skies

Patrice

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Sam W

Dec 18, 2024 · Edited: Dec 18, 2024

I would only run noisex once, and always as the last step.

Well Written

Tony Gondola

Frequent contributor

Dec 18, 2024

This is a matter of taste but I think you are reducing the stars too much. Just because you can doesn't mean you should ;-)
It looks too sparse and you've completely killed the beautiful star cluster in the center of the nebula.

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Tim Ray

Dec 18, 2024

This is a nice image. I think you have enough data for this bright Nebula. Lots of other things to capture in that region of sky… lots of ways to process an OSC DUO Dataset. Play. It's always my 4th or 5th pass on a dataset before I have something I'm happy with. Your stars look good. Lots of signal. A light pass of HDR will flatten it out b4 a light pass of LHE to give the image a little pop. Extract your channels and do a custom HOO pallette. Lots of ways to play.

CS Tim

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