In reply to @chadi’s comment in the Hand Paint Style thread, here is a quick workflow for working with integer (8, 10, 12-bit) files like DPX and mixing them with CG:
load all clips into batch, and convert them all to 16 bit FP.
You don’t have to do this to the CG, but 32-bit is overkill in every image-based instance. The only passes that are better at 32 bit are the UV pass, and Cryptomattes.
Use Color Management Input Transforms to convert all your imagery to Scene Linear to line up with the CG. For LogC this means Choosing LogC as the input format and ACEScg (or similar) as the output format.
Comp everything. Render out any precomps as 16 bit.
Once you are happy, make another Color Management Input Transform and reverse the input and output–go ACEScg to LogC. This will match your source plate exactly and not destroy any information.
there’s also this hasty tutorial I made that is related. I could ramble on about this stuff for days.