Exact color temperature shifts.
Posted 11 July 2018 - 09:20 PM
Posted 12 July 2018 - 11:24 AM
Not precisely. The response of the film to light is not sufficiently linear for white balance changes to be made after the fact. You could do it more accurately by performing some sort of linearisation on the data. This would require an analysis of the film stock, processing and transfer, which is certainly posssible but probably nontrivial.
Many tools exist which will approximate white balance fixes after the fact, though they may not be very accurate.
Posted 12 July 2018 - 03:46 PM
Adjusting Kelvin numerically with software or a plugin isn't super accurate or convenient, but the classic way to do what you're describing would be to shoot a gray card without your filtration in. This gives you perfect balance to whatever the daytime conditions are, and your filtration stacks properly on top of that.
Posted 12 July 2018 - 03:48 PM
Once the film has been shot, there is no more kelvin settings you can use in software. The transfer machine defines the color pallet and you'd then have to manually grade every scene after that. Using color charts with DaVinci does help keep color accuracy per scene, but only for base color balance, not for a particular look. Finding color balance is easy using the RGB waveform, so this step is unnecessary for film really. If you are looking to retain a particular look of a lens per say, that would have to be done in the grade.
With digital shooting in RAW, you can adjust the kelvin in post production.