The goal of this project was to colorize images taken by Prokudin-Gorskii during the early 20th century. This was before the advent of colored photos, so Prokudin-Gorskii took 3 photos of the same scene with 3 different physical filters: red, blue, and green. However, because the three pictures were taken separately, they do not align exactly. It required some additional work to align the 3 images so that the original colored scene could be recreated. The original glass plate negatives looked like this, with the top photograph corresponding to the blue channel, the middle corresponding to green channel, and the bottom corresponding to the red channel.