system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Is there a difference between green screens and blue screens?
gpt
* If you're talking about Chroma Keying (like weather person in front of the animated weather map behind them) then the answer is "No".
* Remember that the video hardware will replace ***anything*** that is the chosen color.
* So if you use a blue-screen, you'll also be replacing anything on the person's clothing or body that is blue....like their eyes.
* Green is used because it's been determined that it causes the least amount of these issues where things on the person disappear. 
* In fact any color can be used. 
* Also there is a version called "luma key" which works based not on the color,  but on how bright something is versus how dark the background is.