Color-accurate final output

Composure, Unreal Engine’s built-in compositor, facilitates real-time compositing directly in the Unreal Editor, enabling final-pixel output to be delivered in camera. Individual passes can also be output for offline compositing, while support for OpenColorIO in Composure, the viewport, and the Movie Render Queue, and the ability to output to HDR displays while respecting the ACES standard ensure consistent color throughout the pipeline.

You can find more information on these features in the documentation: