Workin' on a little tutorial for doing this, involves some python code but hopefully folks find it useful...

Not to get "accurate color" since there's no such thing, but rather match one observer's biases to another in a particular scene. (source to target)

Update, tutorial is public :3 https://youtu.be/inLKBxAnlzU

not very good at making tutorials but oh well

Advanced 3x3 matrix camera matching in Resolve

YouTube

Also, I now have a python script that combines the steps. It takes source/target images, computes the matrix, and outputs a working DCTL all in a single step. :3

https://github.com/ctcwired/dctl-matrix-maker

would you believe this is the first time i've ever put anything on GitHub x3

GitHub - ctcwired/dctl-matrix-maker: Python script for creating 3x3 matrix DCTLs using source and target ColorChecker images

Python script for creating 3x3 matrix DCTLs using source and target ColorChecker images - ctcwired/dctl-matrix-maker

GitHub
god i can't believe how well this works