colorize
US /ˈkʌl.ə.raɪz/
UK /ˈkʌl.ə.raɪz/

1.
colorare, dare colore a
to add color to something, especially a photograph or film that was originally black and white
:
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They used digital tools to colorize the old black and white movie.
Hanno usato strumenti digitali per colorare il vecchio film in bianco e nero.
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The artist decided to colorize her sketches to give them more life.
L'artista ha deciso di colorare i suoi schizzi per dar loro più vita.