The so-called PaintsChainer project can take your basic line art, created using whatever drawing program you happen to use, in a number of ordinary file formats, including JPG, PNG, GIF or even TIFF, and then automatically apply color, in a dreamy watercolor/colored pencil style that’s a pretty popular style among digital artists.
It’s still amazing what this system can do on its own without any input, and even more so what it can do with just a few hints by way of guidance.
See the full story here: https://techcrunch.com/2017/02/02/this-neural-network-based-software-will-automatically-color-in-your-line-art/