Sky Replacement Color Problem

I'm trying to replace skies and the color of my source skies is being changed in a bad way. Please view this video clip to demonstrate and explain:

Thanks in advance for your input. I'm not an expert, hoping this is a bug and not my fault.

Before talking about the color management here, make sure that there are no additional color adjustments happening inside the OFX and the composite mode in the OFX is set Normal.

If none of this helps, I would assume that it has to do with Resolve not applying the IDT to the Matte. You would have to add a second node inbetween the matte and the OFX with a CST and convert it accordingly.
My guess is, that Resolve doesn't do this automatically, because for multi-mattes for VFX for example you do NOT want that to happen. As the software doesn't know how you are using a matte, you have to apply color management manually.

It's not that Resolve isn't applying the IDT it's more the opposite. The Matte is inheriting additional management properties from the clip. You need to add a CST in between that changes the output of the the matte to DWGI, then you'll have parity. If I don't insert the CST in the middle the colors go nuts as in the OP's example. It looks like RCM assumes that the matte is DWGI by default and applies color management accordingly.

Good Luck

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It's not that Resolve isn't applying the IDT it's more the opposite. The Matte is inheriting additional management properties from the clip. You need to add a CST in between that changes the output of the the matte to DWGI, then you'll have parity. If I don't insert the CST in the middle the colors go nuts as in the OP's example. It looks like RCM assumes that the matte is DWGI by default and applies color management accordingly.

Good Luck

cst.png

source.png

I kind of disagree. It is correct that in your case the CST has to go Rec709/Gamme 2.4 to DWG/Intermediate, however that depends on your project settings. And you are basically repeating what I said before.

Also I still do think Resolve is not applying an IDT to the matte, which is why you need to manually convert the colors to the desired color space. Note that you cannot assign an IDT to timeline mattes or clip mattes in the media pool. As stated above, for multi-mattes it also does not make sense to have an IDT assigned to them.