Photoshop in the early 20th century
At the beginning of the 20th
century some clever photographers specialized in Photoshop before the term existed, faking postcards from mainly rural communities. Images
of oversized vegetables, fruits and animals created a utopian myth
about a town or region and served as a way of encouraging settlement
and population growth. Some noteworthy collections of these so-called "Tall Tale Postcards" can be found here (Wisconsin Historical Society) and here (American Museum of Photography). UPDATE: Things magazine has found another weird example of postcard manipulation.

