Interesting question, but the tradition to change the image appeared much earlier than the computer. Take, for example, the work of French photographer of the 19th century Gustave Le Gray.
Using available technology in its time to get a clear picture and the clouds and the landscape in the foreground was impossible.
But he found a way out - combined the sky with one negative and the other shore. Get the perfect picture.
Nikolai Antipov, Joseph Stalin, Sergei Kirov, Nikolay Shvernik and Nikolai Komarov, Leningrad, 1926 (unknown photographer)
Nikolai Antipov, Joseph Stalin, Sergei Kirov Nikolai Shvernik, 1926
Joseph Stalin, Sergei Kirov Nikolai Shvernik, 1926
Joseph Stalin and Sergei Kirov, 1926. Published in the book "Joseph Stalin. Curriculum Vitae "(Moscow, 1949)
The artist Max Ernst, 1946
Portrait of an unknown woman with a ghost, 1862-1875
The man in the foreground and clear images in the church, 1850
Media mogul William Hearst rises above the crowd, 1929
Cat + n 1932
Leap into the Void, 1960
Incredible meeting 1914
Room with an eye 1930
Advertising companies Texaco Inc., 1957
Man in a Bottle, 1988