Think of when you have a really big photo in photoshop like 20,000×20,000 so theres lots of detail. Then you size it down to 500×500, and you can still make out what the picture is but with much less detail. Once that’s happened, even if you resize it back up to 20,000×20,000 you still won’t be able to see any of the small details even though it’s the same image in the original size.
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