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Combining narrowband with broadband data?


(@croz)
Molecular Cloud Customer
Joined: 1 year ago
Posts: 4
Topic starter  

I’ve been using an L-enhance filter for the last year. This is a good filter for nebulas, but I’ve been thinking about getting an L-pro for galaxies. 

 

I’ve been wondering if people use both of these filters and combine the data in APP? I’m still having difficulty getting blues and yellows in my images, so wondering if using the broadband filter as luminance in APP?  


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4727
 

Luminance won't bring out the colors though, it will help in getting more detail. For color you'd want broadband data added to the mix indeed and not too much filtering.


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(@ippiu)
Red Giant Customer
Joined: 3 years ago
Posts: 132
 
Posted by: @vincent-mod

For color you'd want broadband data added to the mix indeed and not too much filtering.

What are you meaning? Could you please explain the workflow step by step?

I'm trying to find a workflow in APP for mixing LPro data with Extreme data, but I'm not satisfied too much...

For now I'm doing:

- process and stacking separately RGB (L-Pro) data, save R,G,B single channels cal

- process and stacking narrowband (L-Extreme) data by Ha-Extract and OIII-extract. 

- normalize R,G,B, Ha, OIII

- using RGBHOO combine tool to mix the 5 channels

Is this method the best to preserve the star colors?

Is this method the best to achieve the highest SNR ratio?

Which workflow do you advise to follow to achieve the most reliable colors and highest detail and SNR??

Thanks


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(@vincent-mod)
Quasar Admin
Joined: 5 years ago
Posts: 4727
 

That is indeed a good workflow! However, getting the colors out is trickier as these signals are kind of weak. So RGB usually needs more data, longer exposures (mono camera's can help here as well as they collect more data per sub). Mixing in narrowband data will distort the normal distribution of the broadband signal. This is why color correction is a big hit or miss afterwards, keeping the colors very nice requires either mixing in less narrowband data or doing something like taking out the RGB stars and putting those back in later. Things like that. Adding saturation later of course also helps.


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(@ippiu)
Red Giant Customer
Joined: 3 years ago
Posts: 132
 

@vincent-mod

Thanks a lot...


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