Re: [Avid-L2] How to set up HDR Avid Project with Panny Varicam 35 Vlog, Vgamut material?

Well there in lies the rub.  The footage I have has bright white lights in the background.  It's a comic stage performance.  Even if I just start with the vlog with no lut the bright lights aren't that much hotter than the subject.  Using lift, gamma and gain I can't seem to pull the highlights very far away from the flesh tone level.  It would be a pretty extreme notch.  My novice understanding of HDR intent matches what you say in that the bulk of the image will remain at 100 nits or less just the specular highlights will shoot up.  In my material the image looks exposed and lit in a manner that is more like SDR. 

The image isn't bad it just seems to look right when the bright lights in the background are peaking just a bit over 100 nits.  I guess that's okay but even the vlog looks a bit clipped/flattened on the bright lights.


On Sat, Nov 30, 2019 at 12:56 AM, Pat Horridge wrote:

John you can't convert any of the camera outputs to HDR directly. 
The camera is just capturing a wide dynamic exposure. 
But HDR isn't really just a wide dynamic range. It's a fudge. 
We want the SDR element to still look as it would in SDR. 
An HDR output of a scene on an HDR display needs to look rxacy the same as it would in Rec709 (ignoring wider cor gamut for now)
You are the choosing in the grade how to distribute the HDR highlights over the Nit range above 100.
That has to be a created choice. 
In Avid when in 2084 or HLG you waveforms internally are calibrated to show the 100 nit range and then the HDR above that.
It's the grade that distributes the exposure over those areas and then the monitor that shows you how it looks. 

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