Nobody is trying to actually ELI5 so:
Imagine you make a painting. When it’s finally dry, you can see all the bumps from the paint! You can even count the brush marks. You can feel em. The color is juuuust right!
Now take a photo of that painting. It looks the same, but you can’t feel the bumps anymore. When you look very close, some of the colors aren’t the same anymore. The photo is flat. You’ve lost some of those very small details.
Good thing you have the (raw) original painting!
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