A photogravure is a photographic image produced from an engraving plate.
The process is rarely used today due to the costs involved,

but it produces prints which have the subtlety of a photograph

and the art quality of a lithograph. In essence, the production

of a photogravure consists of three steps: taking the picture;

producing a printing plate of the image; and printing the image on paper.

The basic process was developed in the 1850's.

The rich sepia ink is the final element in the production

of these beautiful prints of the Western North American Indian.

His Traditional Dress, Customs, and Life Styles