Learn to take screenshots in Unreal. You can use them to do external color grading or for building LUTs (look up tables) to bring back into Unreal.
Links to time code topics:
Screen shots: 0:25
Photoshop LUTs: 01:18
Adding a LUT in Unreal: 03:21
Resources: 04:46
Google Doc link: https://docs.google.com/document/d/1c...