The bulk of this project took place from 1909 to 1915, when Prokudin-Gorskii traveled about the land in a railroad car outfitted as a darkroom, provided to him by the tsar.
In the composite image below, I used Adobe Photoshop to recreate the process of converting three black and white frames into a full color image.
In the black and white strip on the left, the filter sequence is blue, green and red.
First, I created a blank RGB (red/green/blue) file in Photoshop that was the size and resolution of one of the individual frames. I then copied each of the frames into the corresponding color channel of the Photoshop file. A simple lining up of the channels resulted in the full color image on the right.
Ghosting in Prokudin-Gorskii’s color images is caused by any misalignment between the successive exposures. Probable reasons for this are subject movement and/or movement of the negative plate between the exposures.
Prokudin-Gorskii left Russia in 1918 after the revolution. He eventually settled in Paris, where he died in 1944. The Library of Congress purchased the collection from his sons in 1948.
Digital color composites for these images were made for the Library of Congress by Blaise Agüera y Arcas in 2004. Images are courtesy of the Library of Congress.
More information on Sergei Mikhailovich Prokudin-Gorskii, as well as a larger selection of his images can be found at the Library of Congress.