colorise

Verb

colorize (third-person singular simple present colorizes, present participle colorizing, simple past and past participle colorized)

1. (US) To add color to.
   • The woman colorized her hair.

   Synonyms:

   color, color in

2. (US) To convert black and white media to color by digital post production (as is often done in digital photography and in video special effects).
   • There is a colorized version of Casablanca.