colourize

/K AH1 L ER0 AY0 Z/
verb
  1. 1

    To add color to.

    โ€œThe child colorized the drawing.โ€

  2. 2

    To convert black and white media to color by digital post production (as is often done in digital photography and in video special effects).

    โ€œThere is a colorized version of Casablanca.โ€

Source: https://en.wiktionary.org/wiki/colorize, https://en.wiktionary.org/wiki/colourize