I was watching a live boxing fight from 1962, How did they add graphics or text to the screen on sports events, news, etc?

Question

I was watching a live boxing fight from 1962, How did they add graphics or text to the screen on sports events, news, etc?

In: 190

Answer 1

Somebody else might do a better ELI5, but I remembered the term chromakey and looked it up:
[https://en.wikipedia.org/wiki/Chroma_key](https://en.wikipedia.org/wiki/Chroma_key)