system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How accurate is a colorized photograph, and how does it work?

I have searched this and I saw that it was asked already, but the answers given did not answer it well enough in my opinion.
gpt
It's 100% guesswork.  The colors are made up. That being said, it's reasonable to assume the sky is not going to be purple, and the persons dress at the wedding is going to be white, not bright yellow.  The fire truck is probably red and the street lights are likely red as well.  Trees are probably green and so is the grass, how green though is a guess.

Although there's nothing in the picture's data that would lead someone to believe that grey is red instead of green for example.