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When to make a synthetic luminance?

PostPosted: Thu Jan 04, 2018 12:20 am
by singding
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

Re: When to make a synthetic luminance?

PostPosted: Fri Jan 05, 2018 3:20 pm
by Rkonrad
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

Re: When to make a synthetic luminance?

PostPosted: Sun Jan 07, 2018 2:56 am
by singding
De noise before combine the synthetic Lum and synthetic chrominance, or de noise after combine...? Or both lol

Re: When to make a synthetic luminance?

PostPosted: Tue Jan 09, 2018 3:59 pm
by Rkonrad
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

Re: When to make a synthetic luminance?

PostPosted: Sun Jan 14, 2018 2:36 pm
by singding
Ok, that's what I have been doing. I think I'll go find that thread, see what it says. Thanks