As a complement of information, the question of colorization was recently revisited using deep learning methods [1]. All very interesting work! [1] Zhang, Rich

As a complement of information, the question of colorization was recently revisited using deep learning methods [1]. All very interesting work! [1] Zhang, Richard, Phillip Isola, and Alexei A. Efros. "Colorful image colorization." European Conference on Computer Vision (2016) http://richzhang.github.io/colorization/ http://richzhang.github.io/colorization/