Heinrich Kühn

Carl Christian Heinrich Kühn (25 February 1866 in Dresden – 14 September 1944 in Birgitz) was an Austrian–German photographer and photography pioneer.

His photographs closely resemble impressionist paintings, with their frequent use of soft lighting and focus.

Kühn mainly used the gum bichromate technique, applied in several layers, and thus allowing for previously unseen color tonalities.

In 1915, he developed the Leimdruck technique, which uses Animal glue as Colloid and produces pictures similar to gum prints.

He also invented the Syngraphie, a forgotten technique that uses two negatives of different sensitivity to obtain a larger tonal spectrum.