Yet another Dragon SxS Helium Example

[Stacey Spears]

It's a TCL expression not RED's exposure tools

Yep, sorry, I was thinking in camera exposure tool.

 

[Stacey Spears]

but how are you exporting that EXR from RedCine, is it exported as full linear float or in one of the Red gammas?

I forget, but doesn't RCX only export EXR in linear? ACES for sure, but I thought non-ACES was linear only too.

 

[Stacey Spears]

Gavin, maybe you can export an ISO 1600 helium to compare.

 

[Graeme Nattress]

EXRs from REDCine-X are always linear.

Graeme

 

[Gavin Greenwalt]

Outputs to Nuke were EXR. So exporting one ISO vs another in linear is kind of pointless since it's just a multiplication in linear space. 1600 ISO is just an 800 ISO output with a 2.0x multiply on it. And the way that REDGamma is setup, it outputs well past clipping at 800 ISO in linear. But since it's EXR there is no clipping, it's just overbright data that I grade down.

 

[Sabovic Adis]

Gavin, any artefacts when using Alchemy or Grain? I mean when exporting to EXR.

 

[Gavin Greenwalt]

Gavin, any artefacts when using Alchemy or Grain? I mean when exporting to EXR.

Yeah, they break the image entirely. Graeme, might make sense to disable those on EXR output.

 

[Sabovic Adis]

Yeah, they break the image entirely. Graeme, might make sense to disable those on EXR output.

Phew, thought it was just me. :rofl:

:thumbsup:

 

[Ian D]

Gavin and I want to cover EPIC Dragon, Weapon Dragon and Weapon Helium.


This would be great, I am still trying to find some differences between epic dragon and weapon dragon, just picture only to see what difference the newer tec brings.

 

[paulcurtis]

EXRs from REDCine-X are always linear.

Graeme

Forgive the newbie questions

So does the ISO affect the EXR or is the EXR basically the entire linear sensor data as is?
And what primaries would these EXRs be based on?

thanks
Paul

 

[Gavin Greenwalt]

So does the ISO affect the EXR or is the EXR basically the entire linear sensor data as is?

Yes to both. ISO affects EXR linear data. If a value is 0.25 at ISO 800 it's 0.50 @ ISO 1600. If a value is 1.25 at ISO 800 it's 2.5 at ISO 1600. ISO is just the multiplication of the value. Since EXR doesn't clip anything, the values just get very large at high ISOs.

And what primaries would these EXRs be based on?

The color primaries are based on the color science (DragonColor, RedColor, RedWideGamut etc...) that you selected.