Image:Sergei-Prokudin-Gorski-Larg.jpg

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This is a file from the Wikimedia Commons. The description on its description page there is shown below.

A 1915 photograph of Sergei Mikhailovich Prokudin-Gorskii.

This image was first published in the United States in 1923 or later, but is considered public domain by the Library of Congress because its copyright has not been renewed or has been formally released, or for another reason.
This tag is not to be used for copyrighted images or pre-1923 public domain images.

Sergei Mikhailovich Prokudin-Gorskii, 1915 photograph (a detail of the larger photo).
Public domain from memory.loc.gov.

[edit] A quick-and-dirty tutorial on converting Prokudin-Gorskii photographs with Adobe Photoshop

Download an archival tiff image of one of the three-color slides [1]]. (These are huge files, around 70MB. Anticipate 45 minutes to an hour over DSL.)
Open the file in Photoshop, copy the top image.
Make a new file, and make sure it is RGB format
Make the channels visible in the floating palette
Paste the top image into the Blue channel
Repeat the process; paste the center image into the Green channel, and the bottom image into the Red channel
View the whole thing. The channels won't be aligned; they'll need to be nudged with the Move tool. Work with the center of the image; magnify 200-300% for best results.

This work is from the collections of the United States Library of Congress. No information on copyright protection or usage restrictions has been given for this particular work, thus it is presumed to be in the public domain in the United States.