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I'd like this blown up just slightly so that it's 1440p. Then it's only a matter of extending the left side out to 2560. But the issue there (and why I don't do this myself) is that the background is kinda funky looking? I think it's painted, but it looks sloppy, so keeping a consistent texture appearance would be a challenge. IF you want, you could alternatively attempt to remove the background and replace it with a solid color approximately the same shade. But this is up to you based on what you thinks looks best and/or saves you the most time and effort.
