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Hi @jakob - you're definitely onto something. I think the issue is with ACES (which Color.io uses) and DWG and converting between them. I'll try to figure out a better way to handle this but here's a workaround that is working for now:
Here's a screenshot of the complete CST node setup in Resolve for Arri Log-C material:
CST is using different transforms than ACES so it's going to be hard / impossible to match what the CST is doing with the ACES framework that Color.io is using but I might be able to approximate.
@jakob also just realized that you'll only get a 100% match when "White Point Adaptation" is turned off on the CST that converts DWG to ACEScct. So yeah the ACEScct to DWG conversion in Color.io definitely needs work! I'll give you an update soon.
@jakob - I just published an update that better matches Resolves internal tone mapper when using CSTs. Please try and give me an update if it's working in your setup!