Aces Deliver to prores4444 problem

[cho]

Hi eveyone

 

I'm dit

 

While studying ACES,

 

After converting ACES2065-1 to PRORES4444 through davinci resolution,

 

then I set the ODT to 709 in the ACESCCT workspace

 

but I found problem the highlight clipping compared to the original.

 

The ACES standard EXR does not have this issue.

 

EXR is same Original

 

What is the cause of this problem?

Edited November 12, 2022 by cho

[Moritz Bastian]

ACES needs a Float container. EXR is the right choice.

[Mazze]

AS Moritz stated, linear content, such as ACES2065-1 needs to be delivered in a floating point container.
ProRes, H264, DNx, etc. are all integer and will clip the signal at 1 (while the actual image content can go way higher than that in lienar space)
The only way to transport ACES via a ProRes file would be to encode it with a log curve (such as ACEScc or cct),
but the proper way to deliver ACES, is to use ACES2065-1 in an OpenEXR container.