colorize

verb

1. (US)To add color to.

   “The woman colorized her hair.”

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.”

   “What we see are beautiful overlapping NASA satellite photographs of the American mainland, […]taken in black and white and then luminously colorized by computer for scientific reasons.”