COLORIZE
color, colorize, colorise, colourise, colourize, colour, color in, colour in
(verb) add color to; “The child colored the drawings”; “Fall colored the trees”; “colorize black and white film”
Source: WordNet® 3.1
Etymology
Verb
colorize (third-person singular simple present colorizes, present participle colorizing, simple past and past participle colorized)
To add color to.
(photography, filmology) To convert black and white media to color by digital post production (as is often done in digital photography and in video special effects).
Synonyms
• (to add color to): color (colour), color in (colour in)
Antonyms
• (to change or lose color): discolor (discolour)
Source: Wiktionary