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