How do they turn black and white shows into color?

Question

How do they turn black and white shows into color?

In: Technology

Answer 1

1. Take a colourfully vibrant picture.
2. Turn it to grayscale
3. note which colour turns to which shade of grey
4. apply it in reverse to an originally grayscale picture
5. profit

Answer 2

They don’t? Maybe you can provide an example that led you to question?