colorise

/ˈkʌləraɪz/
verb
  1. To add color to a black-and-white photograph, film, or other image, especially using digital techniques.
    • The studio hired an expert to colorise the old silent film.
    • You can use software to colorise historical black-and-white photos.
    • Many classic movies have been colorised for modern audiences.
Synonyms
What does "colorise" mean? | whatsthatwordmean | whatsthatwordmean