Display and screen

H2703 wrote:

Why in low brightness do I have a green display while on FaceTime or photo booth?

Does not sound good.

Try a higher brightness and compare your results.

The next macOS Ventura touts the ability to use a iPhone camera as a feature...

not a solution, but maybe an improvement:

Use iPhone as your webcam

https://www.apple.com/macos/macos-ventura-preview/#content-toggle-switch-facetime-calls