- Posts: 449
- Joined: Mon May 13, 2019 10:38 pm
- Location: Minneapolis, MN
- Real Name: Ben Hall
The Output sRGB view transform from ACES 1.2 has a tonemap built in. Try using OCIO to convert to Utility - Texture - sRGB instead of Display - sRGB, or whatever the name of that transform is. That will probably match what that Gamut node does.
So in fact, the typical ACES transform is incorrect, even though it looks more pleasing. Try roundtripping an sRGB image into and out of linear using that workflow, and you'll see what I mean. If you use the display out, the result won't match the original image.
There's a recently-released ACES update that has a config compatible with OCIO 2.0. It separates the tonemap from the ODT, but I haven't yet experimented with it in Fusion. I'm also not sure where to download it directly; last I checked a couple of weeks ago it wasn't in the OCIO github repository, and the ACES page hadn't yet updated to point to it.