Match Corona colors in Davinci Resolve Fusion 19

[FRENKH]

Hi guys, is there a correct way to match colors between Corona and Fusion? I'm exporting linear .exr 16bit from Cinema 4D Corona, LUT turned off, I keep it on only for visualization while I m working. Not no mention in Davinci color page colors are completely different.
In Fusion 18 I was using the same Corona LUT with gamma correction to 2.2 for visualization and It worked fine.   
Anyone who goes through the same workflow successfully?

Thaks

[Nejc Kilar]

Hmm hmm, fellow Resolve user here (use it daily) and I'm not really 100% sure what you're running into but things do work as expected on my end if I do the following:

- Make sure the tonemapping stack is disabled (including ACES OT)
- Save a 32 bit EXR
- Drag it into Resolve (Color science I'm on Davinci YRGB but without the color managing, Rec 709 (scene))

This will allow for a fully linear workflow aka you can do advanced compositing on with things then. If you'd like to get the ACES OT look back in directly in Resolve then you go to the Color page and throw the "ACES Transform" node in there. You'll probably want the sRGB (Linear) as input and sRGB as output.

Now if you'd like to use tonemapped images but still want some extra data by going EXR 16/32 bit then from what I recall you just export a tonemapped image and load it up in Resolve and it should all work automatically.

Let me know if the above helps, if not I'd be happy to dive deeper :)

[FRENKH]

Hi Nejc, thanks for the suggestions

- Tone mapping is disabled, the only option is "Photographic Exposure"
- 32 bit, done.
- Color management disabled, done.

What kind of LUT do you use for visualization in Fusion? And can you use a LUT from Corona?

[burnin]

keeping it 'linear' you use "Linear to Gamma 2.2" LUT (LUT>VFX IO>...)

[FRENKH]

keeping it 'linear' you use "Linear to Gamma 2.2" LUT (LUT>VFX IO>...)

It doesn't work, you get washed out color and less contrast in Fusion compared to Corona VFB

[burnin]

Well, then you're simply doing something wrong.
Here are 2 EXRs (from VFB & C4D) w/ aforementioned LUT applied & JPG w/o, in Resolve.

[FRENKH]

Thank you burnin but how do you see colors in Fusion?

[burnin]

Same.

PS
I suspect, you're applying LUTs later on, and not in Media Pool...   

[FRENKH]

At this point I think it's a bug on the mac version of Davinci. I'm pretty sure I did everything you suggested but I'm still having a color mismatch...
Using "Davinci YRGB color managed" maybe was the worst error, now fixed, and applying the gamma LUT on the media page is a good idea but there is something else going on mac environment in my opinion. There are also a couple of preferences, mac specific I suppose, that I tried to change but it went even worst. 

[FRENKH]

Speaking of Corona FVB, image contrast is veri close to what I see in Fusion while saturation is closer to Davinci editing page, so there is noway to say what's right.

[burnin]

Ahh, mac...
Maybe this thread can help you: Apple DWG Workflow Gamma Shift in Rec709 2.2 (@ Blackmagic Forum)

[FRENKH]

Ahh, mac...
Maybe this thread can help you: Apple DWG Workflow Gamma Shift in Rec709 2.2 (@ Blackmagic Forum)

Thank you burnin, anyway that post was about a mac export issue that has recently been resolved with the introduction of "REC709-A gamma" specifically for mac. I'm pretty sure mine it's a different problem.

[burnin]

Yes, that was specific issue, but there are also other tips (and links) there, informing how to get consistent results, manage colour, grading, levels, ...  over different types of displays.

Either way, you can post your exemplary Resolve project here and we'll see how it fares on other systems.

Edit/
or just share your .exr, for starters
 

[FRENKH]

Yes, that was specific issue, but there are also other tips (and links) there, informing how to get consistent results, manage colour, grading, levels, ...  over different types of displays.

Yes, very interesting!

Either way, you can post your exemplary Resolve project here and we'll see how it fares on other systems.

Edit/
or just share your .exr, for starters
 

This is a link to a dropbox folder containing both the cinema 4d and the davinci scene. If anyone wants to have fun... :D

https://www.dropbox.com/scl/fo/mg1ccmc6z0yx0i2ki67vc/AIJRF_BVCMCOJ0vXbKiV3pE?rlkey=wp33nh7sz5y241zv8tpdk349x&st=t9qm4ve8&dl=0

[burnin]

OK. Have checked and observed you didn't fully disable Corona's Tonemapping and you also have Cinema's LWF set to sRGB, which are most likely source of your issues.
More you know, less you know... ;)