colorize vs mottle

colorize

verb
  • To add color to. 

  • (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). 

mottle

verb
  • To mark with blotches of different color, or shades of color, as if stained; to spot; to maculate. 

noun
  • A distinguishing blotch of color. 

  • A mottled coloration or pattern. 

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