What is the main difference between REC 2020 and REC 709?

The main difference is color gamut. REC 709 covers about 35.9% of the visible spectrum, while REC 2020 covers 75.8%, resulting in more vibrant and accurate colors.

Can I use REC 2020 on a REC 709 display?

Yes, but colors may appear washed out or inaccurate due to limited REC 709 color reproduction. Conversion or downscaling is needed for proper display.