system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why does a screenshot (of a screenshot) lose quality? Isn't it a digital process?
gpt
Digital process doesn't mean lossless.

Your screen might only display a reduced version of the original file, and a screenshot takes *exactly* what the screen is displaying without looking at the file at all.

So if the picture is 4k but your screen is just regular HD then it must be reduced to be able to display it. And the screenshot will only copy the reduced version

But if your screen can display all the data then a screenshot can be lossless (unless you then save it in JPEG wich always reduces quality to save disk space)