OpenColorIO 2.0 Upgrade #84819
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Reference: blender/blender#84819
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Changed status from 'Needs Triage' to: 'Confirmed'
Added subscribers: @Jeroen-Bakker, @brecht
Just to give a status of the branch.
The smaller changes have been done.
ocio wrapper in intern should be updated to use the ocio pipeline. I didn't see a way around this API change. In the tmp-ocio-v2 I was planning for these changes but haven't done any code changes.
OpenColor 2.0 Upgradeto OpenColorIO 2.0 UpgradeAdded subscriber: @Blendify
Added subscriber: @baoyu
Since blender integrated OCIO, there's no way to set RRT and ODT seperately. RRT and ODT are tied together and can't be changed to any useful transforms other than srgb.
Could we have full ACES support or at least fulfill: 1 ability to seperately set IDT, RRT and ODT; 2 more useful transforms like Display P.3, Rec 2020 etc. and a correct preview, output, compositor tools that respects the color management.
Added subscriber: @svenstaro
Hey guys, in Arch Linux we're currently in the middle of the opencolorio 2.0 rebuild and Blender is currently blocking these efforts. Could you perhaps give me an update on this?
Added subscriber: @Memento
This issue was referenced by
1b4961b318
This issue was referenced by
6b40ee608c
I have a set of patches now for the upgrade, they still need to go through review.
There is no specific timeline for when this lands, I would guess somewhere in the next two weeks.
Cool, thanks for the fast action. :)
For the time being, we've added an opencolorio1 package that Blender builds against but I'd like to drop that package again ASAP.
Added subscriber: @SteffenD
Added subscriber: @troy_s
@troy_s, is there a plan to update Filmic for OpenColorIO 2.0?
OpenColorIO has builtin transform for ACES and various displays now, and they work based on the new display reference space concept, using
CIE-XYZ [D65](https://archive.blender.org/developer/D65)
.https://opencolorio.readthedocs.io/en/latest/configurations/ocio_v2_demo.html
I'd like to add more displays and the ACES RRT to our config, and later figure out how we can also ship a config with ACES refererence space.
However lookup tables like
filmic_to_0-70_1-03.spi1d
I guess contain both part of the view transform and display transform, and it's not clear to me how they were constructed and how they might be split.Yes. I was letting the dust settle on v2.0 first.
Indeed. They came around to that idea finally, but sadly left out the display colourimetry aspect that would permit DCCs to query the chosen display colourimetry. It’s relevant to Blender due to the need to manage colour wheels, gradients, and composite in display linear. Might help to formulate a plan and have your voice there in the nearer future.
Should be rather trivial, but perhaps waiting for v2 might make more sense here. ACES brings so many broken facets to the table that people without an in-house colour scientist or colorist would likely be left helpless to repair things. ACES use is more or less as simple as a download, so not certain as to how much “better” it can get than the canonized sources.
The most prominent gains Blender can make is to get the UI up to a managed state. Integration with wider gamut spaces prior to that will be problematic.
Consider the output display encoded for BT.709 based displays. It is trivial to pull the inverse EOTF out of the lookups, and keep them display linear “clean”. It might be worth discussing how this can fit in nicely with Clem’s more recent display linear manipulations for overlays etc.
Available on Rocket if need be.
As far as I know we have enough information from the config for handling color wheels, gradients, and compositing of UI elements. We really just need to do some operations in an approximately perceptually linear space, independent of the chosen display. And for that we can use
cie_xyz_d65_interchange
+ some transform of our choice to a perceptually linear space.I will probably at the ACES RRT for the sRGB display since it fits in fine, and similar functionality is available in other apps.
The displays are indeed less useful without more changes in Blender, though for file output it's still helpful. Probably will leave them out for now as long as they are not working with Filmic.
Simple case would be a changing of transfer function, or flipping a wheel to reveal greyscale; the assumption of invertibility doesn’t work across a full colour transform necessarily.
In the case of differing display colourimetry for UI, it is required to have the transfer function characteristic available.
Seems problematic given the working spaces are different?
Maybe we're talking about different things, but as far as I know we only need our chosen perceptually linear space to be invertible. Converting to the actual display space would always be in one direction only, at the very end.
Not sure how, going from a smaller to a wider gamut working space doesn't lose any information. It just means you're not taking advantage of the wider gamut.
@brecht Here’s a posting from the OCIO listing. Might be useful to add on the proper additional DCC functionality to Blender?
https://docs.google.com/document/d/1sa68Cjq0TzSYFg2xhf2w2FFAQ1In7G391iINWKXfDo8/edit
All of the assumptions for the ACES chain is from AP1 / ACEScg. Going from BT.709 based default primaries to AP1 and then out the door via the RRT etc. doesn’t make any sense here?
Imagine a colour wheel where the image maker wants to select a colour based on greyscale. Here the displayed buffer is not invertible, so the UI buffer would be uni-directional. The mouse pick would peek into the UI buffer pre-rendering transform in this instance.
Same sort of idea would apply for show LUTs etc, where the image maker may want to choose the colour based on how it appears from the show LUT rendering, and those too may not be invertible.
Finally, consider the case of data where the UI would be able to use one of the V2 transforms for data for representation.
Added subscriber: @STEP-ANI-MOTION
Added subscriber: @Aeraglyx
Added subscriber: @AlexeyAdamitsky
Added subscriber: @EAW
The OCIO 2.1 has been released now. Would that be mature enough?
Though, ACES v2's gamut compression is still in a slow progress... and it's planned to be ready in early 2022 according to the official open plan video conf.
Changed status from 'Confirmed' to: 'Archived'
Follding into #68926 (Color Management Improvements).
Added subscriber: @Eary
A question. Is OCIO v2's aliases feature supported yet? This is an important feature to keep different configs (potentially new official config to ship with Blender) compatible with older *.blend files!
They are.
I've implemented them in the testing trial configuration here...
https://github.com/sobotka/AgX
Seems that "Filmic" as an alias still shits the sheets with:
Color management: scene view "Filmic" not found, setting default "Display Native".
Which I suspect is because it's probably hard coded somewhere? I've included all the aliases.
You can define aliases of color spaces, there are no aliases for views as far as I know.
Good point.
In AgX, in order to make it more compatible with other DCCs, I've related all of the transforms into
ColorSpaceTransform
s. Perhaps it makes sense to point the Blender code at role?I saw it
https://blenderartists.org/t/feedback-development-filmic-baby-step-to-a-v2/1361663/10
For some reason it doesn't seem to work on my end? Or am I mistaken?
Would this also be the reason for Non-Color/Generic Data etc. not working on my end?
Added subscriber: @Rockbard
Added subscriber: @Emi_Martinez