Henryk DerczyńskiHenryk Derczyński was a photographer who lived in Poland.CareerDerczyński was a leading photographer in 20th century Poland. He was educated in Warsaw. Aftermath of [World War II in Poland|After World War II], he documented the fate of citizens Polish [population transfers (1944–46)|forcibly moved] to the city of Wrocław. He later established the Cabinet of Photography in the National Museum, Wrocław. The city developed into a centre of Polish photography, and Derczyński worked at the forefront of the realist style prevalent at the time.Exhibitions and publicationsDerczyński displayed numerous exhibitions and wrote many books, including the biography of Jan Bułhak—the father of Polish photography—that is considered the most sought after.InventionsHe also created an isohelia technology, a technique that sharpens contrasts and defines three-dimensional images, under the brand name "izobrom".