https://www.reddit.com/r/OutOfTheLoop/comments/j523qi/whats_...
I found this point interesting:
"The thing about old photos is that everything about the image is part of the information we can learn from it—not just the picture itself and what it's a picture of, but how it was composed, what its medium was, the balance of lights and darks... It's all part of the document. And when you start to alter it, that's creating a new document reflecting a conjunction between the past and the present. "