Category:Photochrom pictures
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Vidu ankaŭ kategorion: P.Z. – Photochrom Zürich, then Photoglob Zürich (from the 1880s to World War I).
Photochrom prints are colorized images produced from black and white photographic negatives via the direct photographic transfer of a negative onto lithographic printing plates.
This process (also called the “Aäc process”) is properly considered a photographic variant of chromolithography, a broader term referring to color lithography in general.

process for producing colorized images from black-and-white photographies | |||
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- A glazed gateway with a pavilion in Beihai Park (6024679157).jpg 1 024 × 774; 127 KB