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Wiktionary
colourise

vb. 1 (context UK English) (alternative form of colorize nodot=1 English) (gloss: to add colour to). 2 (context UK photography filmology English) (alternative form of colorize nodot=1 English) (gloss: to convert black and white media to color by digital post production).

WordNet
colourise

v. add color to; "The child colored the drawings"; "Fall colored the trees"; "colorize black and white film" [syn: color, colorize, colorise, colourize, colour, color in, colour in] [ant: discolor]

Usage examples of "colourise".

Like an old black-and-white movie that’s been colourised, and not quite true.