Hi @mikae1 !
I’m new here, but I studied a lot 3D-Lut and LUT in general for a project I had.
- I think that 3D-Lut are the best for color grading, they give best accuracy. But they are not as easy to find/create as 2D-LUTs.
- You would be surprised : the size of professional lut are sometimes extremely small. But most of the time they are stored in a proprietary format and I suspect that the data is a mathematical formula, or a curve, so the accuracy is perfect.
The problem is that create a 3D-LUT is cumbersome, or expensive. Programs are not cheap and have a steep learning curve.
But there’s a free one, that I tested and seems good, in my opinion, GrossGrade :
But you can use 2 websites to create your own 2D/3D LUT :
LUT Generator | ARRI (not really tested)
LUTCalc I used this one, as you can choose the accuracy.
The websites are more about color grading from a source like camera to final color profile. The program is more about creating effects like sepia, desert, bluish, whatever.
Edit : Have you read this ?
https://rawpedia.rawtherapee.com/Film_Simulation