Adding BB (LPro) to...
 
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Adding BB (LPro) to NB (Extreme) for real stars color: how to?  

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(@ippiu)
Red Giant Customer
Joined: 3 years ago
Posts: 82
July 22, 2021 23:13  

Hi.

I've been following this famous workflow since the beginning: https://www.astropixelprocessor.com/community/tutorials-workflows/combining-r-g-b-with-ha-oiii-data-using-an-optolong-l-enhance-filter/

to have a good, real stars color in the final image.

But since single R,G,B channel is split by 50% within LPro and Extreme filter in equal weight (R: 50% extract-Ha, 50% R-LPro, G and B: 50% extract-O3, 50% G-B LPro), I wonder if star colors are really the most accurate as real as possible...

 LPro (split in single R,G,B channels) + L-eXtreme (split in extract Ha and O3) combined in RGBHOO

rgbhoo

just L-eXtreme (split in extract Ha and O3) combined in HOO1

hoo

For my taste, there is an improvement in the first image, but not as noticeable and clear as I would expect to see...

What is a good workflow to obtain the most accurate and real star color?

Thanks

 


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(@vincent-mod)
Universe Admin
Joined: 4 years ago
Posts: 3694
July 23, 2021 12:28  

Hi Ippiu,

Yes when dealing with narrowband data and mixing that with RGB (which usually is of lower intensity), it can be quite challenging to get proper star colors. This is why many in other packages remove the RGB stars and add those back into the narrowband data. This is something that will be possible in a future version of APP as well and the star removal feature is a way towards that goal. In the mean time, I think more data on RGB will help and reducing the amount of narrowband added to the mix. It's a balance.


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(@ippiu)
Red Giant Customer
Joined: 3 years ago
Posts: 82
July 23, 2021 12:52  

@vincent-mod

Very clear...

Thanks...


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(@ippiu)
Red Giant Customer
Joined: 3 years ago
Posts: 82
July 23, 2021 15:26  

With LPro filter, oher than adding true star color to narrowband data, what else can I add with LPro filter to final image obtained only with narrowband data?

I made some tests, and honestly I can't see much difference from LPro+ L-eXtreme image - compared with just L-eXtreme image (both obtained with RGB combine tool)...

So, to be honest, is it worth to double the imaging time for a slight improvement?

 


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(@vincent-mod)
Universe Admin
Joined: 4 years ago
Posts: 3694
July 23, 2021 15:48  

Well, good question, maybe longer exposed RGB data is better then. Did you try to lower the amount of narrow band data in the resulting image?


ippiu liked
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(@ippiu)
Red Giant Customer
Joined: 3 years ago
Posts: 82
July 23, 2021 15:56  
Posted by: @vincent-mod

Did you try to lower the amount of narrow band data in the resulting image?

Not yet...On the contrary, I'm doing test on only few RGB data (just 4 hours) compared to 10 hours of narrowband data...

So perhaps you are right: I should add more RGB data, at least the same as narrowband, and then re-do the test...


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