I believe I mentioned that my little brother produced commercials and told me that they can subtly alter the hue to change perception and mood. He said you would never be able to tell just watching. This is also why who controls the video feed at political debates is such an important issue.

This may have been a thing in 2003 when CRTs were the dominant monitor, but LCD/LED/OLED/etc. monitors emit such low EMF, any effect would be negligible unless the person is hypersensitive to EMFs already. And that person is rare.