Fusion ACES LUT still broken in Resolve 19 ?

Hi,

I have just install DaVinci Resolve 19 to see if LUT issues in ACES workflow were solved.
The Release statement mention :

Fusion viewers are now color managed.

But the problem describe here :
viewtopic.php?f=22&t=131844
viewtopic.php?f=21&t=94251
viewtopic.php?f=21&t=206864
viewtopic.php?f=21&t=205759
viewtopic.php?f=21&t=210787
viewtopic.php?f=21&t=207070

And in this 3 years old video :

Doesn't look to be solved.

I have describe my own fixes here :
viewtopic.php?f=21&t=182949

But i would like to have confirmation that even if ACES input / output are set properly , and that image looks perfect in all resolve tab, there is still a problem in the fusion tab were LUT is OFF ?

I guess i still need to use my solve for that scenario or do i have miss something ?
Thanks for your lights.

That would be great to have this finally working in Resolve 20.
Cheers

Well if i disable color management and use this :

resolve.png (30.67 KiB) Viewed 2409 times

There are improvements :
- it does work in all views
- i don't have to set the LUT manually inside fusion
So that is a good step forward, thanks for this.

But when i use this :

resolve2.png (62.47 KiB) Viewed 2409 times

Then when i load sRGB video and i set manually their input to sRGB :

resolve3.jpg.png (148.08 KiB) Viewed 2409 times

I get proper LUT in preview and EDIT timeline, but the LUT is OFF in fusion tab.

Maybe Fusion is not able to understand that this video has been set manually to sRGB, and apply an sRGB conversion on top because it can't understand that the video is already sRGB ?

Is there a way to contact the dev team to submit RFE about this ?
Because after careful testing, i still have this strange LUT offset between Fusion and the rest of Davinci Workspace.

It look like fusion is not really connected to the rest of the app and apply an extra LUT on top of the color managed image.

So i would love to be able to submit a detailed and documented proper RFE to the dev team.
How could i do that the proper way ?

Thanks.

Hey,

I am not a paid user so my emails about this bug report are just ignored. Even though everybody should be able to report bugs technically. I mean I could call it a bug since I cannot even save my own working preset in the ViewLUT manager or whatever, everything's there is "cursed" and doesn't work as it should. No ability to set up everything firmly so every footage that I open in fusion tab is viewed as ACEScg -> sRGB, 'cause everytime I open anything in fusion tab it all gets reset and when I try to pick up a preset that I made it loads up broken. And this has been an issue for years.
I am considering buying davinci but I am not sure if I want to when some obvious annoying fixes aren't there, and if I reach out after buying would they even fix anything?

Thanks for your answer, i am a paid user and i have just send an email to support and i will see if i have better luck than you !

Indeed it is frustrating because it doesn't look like a big deal to fix.

But you can already have a working solution by using this method.

Set your project like this :

img_001.png (16.22 KiB) Viewed 475 times

For each Fusion panel you set your LUT like this :

img_002.png (88.64 KiB) Viewed 475 times

img_003.png (19.77 KiB) Viewed 475 times

Then for each ACEScg footage you load in the timeline you set the grading panel like this :

In Group Pre-clip you set this :

img_004.png (40.35 KiB) Viewed 469 times

And in Group post-clip you set this :

img_005.png (40.41 KiB) Viewed 469 times

This work and is good enough but you can't benefit from the Bypass feature, and your LUT preview in timeline will be off. But it is workable.

But if only we could talk to a dev i think he could fix the LUT bug in a week, it is just a gamma / LUT operation that is forced on top of the image by the ManagedColoredSpace LUT elements. He just need to disable this Operation or give users the option to disable it and set the Fusion LUT to ACES Transform to no operation IN / no operation OUT

More precisely, we just need to be able to disable the toggle highlighted in yellow in the Fusion Tab LUT manager. This is the source of the error it apply an extra linear to sRGB conversion that is not necessary. So by just removing this things, it would work properly.

lut_error.png (43.41 KiB) Viewed 424 times

I have find this very interesting post that offer a way to cancel the LUT by doing the reverse op :
viewtopic.php?f=21&t=193745
Might worth to try replicate this for ACES.

Thanks to philipbowser, i find a way to make it work in color managed workspace.

- You go to viewer > then right click > LUT > delete all LUT
- Only the managedColoredSpace LUT can't be deleted
- Then we have to create a first ColorSpaceTransform LUT to invert the effect of the default one
- Then we create a second ACESTransform LUT to apply the proper transform

LUT_correction.jpg (254.78 KiB) Viewed 393 times

So in order to make it work properly the dev need to replace the managedColoredSpace LUT by an ACESTransform LUT.

It's such a silly oversight. Hope it gets fixed soon.

- Only the managedColoredSpace LUT can't be deleted
- Then we have to create a first ColorSpaceTransform LUT to invert the effect of the default one

If you set the input and output color space and gamma to the same thing there should be no operation in the transform so you don't need to invert it with a second one.

Thanks for your answer shebbe, indeed it work , i just need to set ACES(AP1)/Linear in input and output to cancel the LUT effect. So we just need to add the aces transform. That's a step forward !

I hope they will fix this soon also , at least they could set the following setup by default if it's not easy to make the change.

Thanks for your answer shebbe, indeed it work , i just need to set ACES(AP1)/Linear in input and output to cancel the LUT effect. So we just need to add the aces transform. That's a step forward !

I hope they will fix this soon also , at least they could set the following setup by default if it's not easy to make the change.

Hey, I think they just fixed it in Davinci 19.1 update? Just downloaded and I can see that now Fusion tab picks up the CC well for ACES color management, it matches the other tabs right off the bat without any additional clicking here and there, finally!

Let me know if it works for your use cases, for my ACEScg -> sRGB seems to work well.

I can confirm that it now work in 19.1.
So to all involve in this fix at BM ... THANK YOU !