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trying to understand RLF with Cineon

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Fred Jean
trying to understand RLF with Cineon
on Jul 25, 2015 at 11:03:02 am

I'm on my learning curve and need some help

Here is what's happening:

Received R3d scene with camera settings RC4-RG4-iso 320
The footage is complicated because it's a hard
Contrasted and the subject is in the shade and
Moving damn fast. They screw it.

I decided to do a comp in Fusion to pre-balance using
Masks to reveal the actor because the shapes are
Complicated and I rather do a pre-work like this within
A compo app and then send it to color.

On my write node, I want to switch to RLF, keeping the
RC4, to reveal all the DR and cancel the RG4 curve.
I checked that my footage is exactly the same in Fusion
That if I do the RLF in RedCineX wich is logical in this case
Because I'm using the rmd to change the value.

Now, if instead of this, I keep the camera settings (RG4) and
Decide to log the footage using Cineon lin-to-log parametered to RLF, the result obtained is very different.
It reveals more lattitude (32Bit float?). I expected the same value.
So I deduct (correct me if I'm wrong) that the differences
Are due to the fact that at a source level, switching to RLF
Cancels the redgamna4 curve, while adding a lin-to-log
Node adds a gamma curve on top of the RG4 curve.

In other words, at the moment we quit the source settings,
We are destructive?

So that comes to my second question.

I'd like this comp to go to color in the end for fine tunning.
My idea is to cancel the log-to-lin node for viewing so
I enter resolve with the max DR.

So I'd do it like this:
- R3d switched to Redlogfilm write node
- log-to-lin cineon node
- do the comp
- cancel the log-to-lin node with a lin-to-log or simply disable
The log-to-lin
- send to resolve logged.

But RLF and Cineon default rlf values aren't the same for what I'm seeing. Graeme from Red said that RLF is basicaly
A Cineon implementation.
Now it seems that something happens in the isos.
I didn't touch the camera iso that was 320.

I'm lost to be honest. All this is complicated.

Any help appreciated.

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