Note: Black-and-white images are distinct from grayscale images in that black-and-white images only have two colors, black and white. (Duh.) Grayscale images, however, have many shades of gray.

Despite the ubiquity of color images native to digital cameras, the drama of black-and-white photography never lost its allure, and people always seem to be able to connect with its moody ...

Trained by examining millions of images of— well, just about everything, Zhang’s system of CNNs recognizes things in black and white photos and colors them the way it thinks they ought to be.

Both images appear to feature Fort Denison, a heritage-listed part of Sydney Harbor National Park located in the eastern Australian city. The black-and-white image shows the fort as it stood in ...