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Colorization is a computer-assisted process of adding color to a monochrome image or movie. The process typically involves segmenting images into regions and tracking these regions across image sequences. Neither of these tasks can be performed reliably in practice; consequently, colorization requires considerable user intervention and remains a tedious, time-consuming, and expensive task.

Imagine that you have an image with a small sample of a texture, like a few strawberries (out of a plate full of them), a few square inches of grass (from a large grassy field), or a few dozens of your cat's hairs (your cat really has more than that). If you want to generate a larger texture with this small image, you could just copy-paste it, and put the copies (or "patches") one next to another, but that wouldn't produce a very good result, since the right (or top) part of the image usually doesn't correspond to its left (or bottom) part, when two copies of the image are assembled.