Notice of Meeting - ACES Gamut Compression Implementation VWG - Meeting #3 - 4/15/2021

[jedsmith]

@carolalynn

We discussed briefly that negative values still remain in the noise floor post gamut compression, and that this is intended - pointed to earlier versions of the algorithm in @jedsmith’s repo if folks want an idea of how to solve that separately. But it was not included in the final algorithm to maintain exposure invariance for invertibility.

Not sure I’m understanding this correctly. The shadow_rolloff parameter was not intended to “fix” negative values in the noise floor. It was intended to fix very subtle invertibility issues due to the asymptoting compression curve when dealing with large distance values in shadow grain.

I attempted to explain that clearly in this post if it’s helpful to resurrect this thread again