df12a448ba
Based on extensive testing, this gives matching HDR brighness across most application, with both PNG and AVIF. Video remains at 100 nits as that appears to tbe convention there. This is implemented by adding two modified PQ and HLG color spaces to the OCIO config on startup, and for the specific cases of image save and loaded these will replace the regular PQ and HLG color spaces. This was chosen rather than adding them as color spaces in the OCIO config, so that it can work for any config with appropriate interop IDs, including the ACES config. Additionally, it would be unclear how to make this work with view + display transforms, we wouldn't want to burden the users with having to pick a different display depending if they are saving images or video. Ref #145855, #144911 Pull Request: https://projects.blender.org/blender/blender/pulls/146888
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