Collotype

, signed by J. B. Obernetter , about 1900. Collotype is a gelatin-based photographic printing process invented by Alphonse Poitevin in 1855 to print images in a wide variety of tones without the need for halftone screens. The majority of collotypes were produced between the 1870s and 1920s. It was the first form of photolithography.

, signed by J. B. Obernetter ]] , about 1900.]] Collotype is a gelatin-based photographic printing process invented by Alphonse Poitevin in 1855 to print images in a wide variety of tones without the need for halftone screens. The majority of collotypes were produced between the 1870s and 1920s. It was the first form of photolithography. File:Photo-engraving and photo-lithography in line and in half-tone, also collotype and heliotype (titel op object), RP-F-2001-7-451.jpg|alt=A book opening showing on the left a collotype of a woman seated in a studio, while the right is the title page reading "Photo-Engraving"|Collotype (on left page), 1887. File:Baltimore Orioles and New York Giants, Temple Cup Series - DPLA - 370417303719ed746ed249e88fa594d6.jpg|Collotype reproduction of original painting by Henry Sandham, 1896. File:Bernard, Claude (1813-1878) CIPA0598.jpg|Collotype in black ink of a painting, 19th century. File:Guilherme Gaensly - Avenida Paulista II, Acervo do Museu Paulista da USP (cropped).jpg|Collotype with green ink, 1908. File:Horgan's half-tone and photomechanical processes (1913) (14778035584).jpg|Collotype in sepia ink, 1913. File:Koeln in Bildern, Tafel 54. Das Moltke-Denkmal.jpg|Collotype in blue-grey ink. File:Edward Burne-Jones Witches Tree (Flower Book).png|alt=A woman in a brown cloak stares at a figure in a black cloak among greenery and flowers.|Edward Burne-Jones' The Flower Book (1905), collotype with applied pochoir. File:Frankfurt Am Main-Morgenstern-KAVFFM-010-Mainbruecke und Sachsenhausen in Frankfurt a M.jpg|Collotype (of an engraving) with applied watercolor, 1913. File:272 BIARRITZ. - Vue générale et les Pyrénées. - LL. (3021802285).jpg|alt=Postcard of a coastal scene with the ocean on the right and a city on the left|Postcard of Biarritz, collotype print with applied color, ca. 1916. File:Washington D.C. - White House - 1877 LCCN2017648282.jpg|Hand-colored collotype, ca. 1877–1920. File:Marc Gazelle-lichtdruck.jpg|alt=Gazelle by Franz Marc|Gazelle by Franz Marc, 1923: a collotype reproduction of a painting. ==References== Defibaugh, Denis (1997). The Collotype: & History, Process, Photographic Documentation [MA Thesis ]. Rochester, NY: Rochester Institute of Technology. Dusan C. Stulik, Art Kaplan, Collotype. Getty Conservation Institute, 2013 (Atlas of Analytical Signatures of Photographic Processes) Video of collotype printing at Benrido Press, Kyoto, Japan (2009). http://collotype-vienna.com

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