colorize vs colour

colorize

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

  • To add color to. 

colour

verb
  • Australia, Canada, Ireland, New Zealand, South Africa, and UK standard spelling of color. 

adj
  • Australia, Canada, Ireland, New Zealand, South Africa, and UK standard spelling of color. 

noun
  • Australia, Canada, Ireland, New Zealand, South Africa, and UK standard spelling of color. 

How often have the words colorize and colour occurred in a corpus of books? (source: Google Ngram Viewer )