Image analogies: Image Colorization
The Image Analogies algorithm can be used to "colorize" a grayscale image, by using color information from an example image.
Copyright © 2002 Yung-Yu Chuang, Aaron Hertzmann, Charles Jacobs, Nuria Oliver, Brian Curless, David H. Salesin
Source images from Transferring Color To Greyscale Images. The output image (B') image was generated by Yung-Yu Chuang using the Image Analogies software.