colourise

/ˈkʌləraɪz/
verb
  1. To add color to a black-and-white image, film, or photograph, especially using digital techniques.
    • The studio hired experts to colourise old black-and-white movies.
    • Historians worked with artists to accurately colourise scenes from the past.
    • You can use this app to colourise your grandparents' old photos.
Synonyms
What does "colourise" mean? | whatsthatwordmean | whatsthatwordmean