When to make a synthetic luminance?

Questions and answers about processing in StarTools and how to accomplish certain tasks.

When to make a synthetic luminance?

Postby singding » Thu Jan 04, 2018 12:20 am

Hi,

I was wondering if, when processing HaRGB, or lrgb etc, should I always make a synthetic luminance? Or are there times when it's best not to... just curious as I have been doing it since I learned how.
Also, when doing the synthetic chrominance, in the tutorial that wasn't really processed all the way before adding that to the synthetic Luminance. Shouldn't the chrominance be processed all the way before adding it to the luminance?

Just wondering why, in the tutorial, the chrominance isn't processed all the way.

Thanks KS
singding
 
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Re: When to make a synthetic luminance?

Postby Rkonrad » Fri Jan 05, 2018 3:20 pm

By synthetic chrominance, you mean the colours? If so, my understanding is that all you want from this are the colours. All details including contrast, sharpness etc come from the luminance so fully processing the chrominance would't really provide any new information. It is important to de-noise fully though.

Other viewers: correct me if I'm wrong.

Cheers

Richard
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Re: When to make a synthetic luminance?

Postby singding » Sun Jan 07, 2018 2:56 am

De noise before combine the synthetic Lum and synthetic chrominance, or de noise after combine...? Or both lol
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Re: When to make a synthetic luminance?

Postby Rkonrad » Tue Jan 09, 2018 3:59 pm

There's a thread that I believe Ivo posted - sorry I don't have time to find it - which talks about this. Recalling, you should denoise fully before combining so not necessary afterwards. The denoise only works effectively(/perfectly) during tracking ( initial stages).
Richard
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Re: When to make a synthetic luminance?

Postby singding » Sun Jan 14, 2018 2:36 pm

Ok, that's what I have been doing. I think I'll go find that thread, see what it says. Thanks
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