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There's a visual puzzle consisting entirely of 1 image that I've originally made for a different community. Because it was locally successful, I thought it would be nice to share it with the world. However, the original image is a massive 460 MB 20000x20000 png, and it can be neither cropped (as it doesn't waste much space near the edges) nor significantly resized (as it contains small details that would become unreadable).

I have a compressed version of this file uploaded directly to imgur.com that's an under 20 MB 20000x20000 jpg, but my understanding is that questions on this site should be self-contained, and therefore I am not supposed to link to it. I determined that at around 10000x10000 I can get the file size down to 2 MB, which is the upload limit of i.stack.imgur.com, and still keep small details readable. Unfortunately, when I actually upload the image, it is always shrunk down to some size under 5000x5000, at which point it becomes too hard to discern a lot of the finer details.

It would definitely be possible to redesign the puzzle's aesthetics to make it more readable at lower image resolutions. That said, I've put a lot of time into making it look the way it does, and changing it now would require more work on my behalf than I ever intended to put into publishing it, so I wanted to ask if any alternatives exist. Is there some permissible way I can attach an under 2 MB 10000x10000 jpg image to a question unmodified?

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    $\begingroup$ If puzzles can't be self-contained, it's usually fine to link to an outside resource provided that resource is extremely unlikely to go down. So I think the imgur link would be fine. $\endgroup$
    – bobble
    Jan 2 at 18:01
  • $\begingroup$ Could you break the image down into separate "tiles" that could then be recombined into the one large image in your question? $\endgroup$
    – GentlePurpleRain Mod
    Jan 5 at 15:41
  • $\begingroup$ @GentlePurpleRain I considered that! I think it's viable but it sounds very inconvenient for solvers and I'd prefer not to do that if possible. Either way I already chose to trust bobble's comment and posted the puzzle in question with a simple imgur link - it's available here - so I suppose I'm leaving any further format changes up to the moderator team. $\endgroup$
    – Seren
    Jan 6 at 1:04
  • $\begingroup$ Or rather, if I can help with anything, e.g. if the conclusion is that the "tiled" format would indeed be preferable despite being cumbersome to work with, I'm available to do the actual editing work - as long as I know that's desirable. $\endgroup$
    – Seren
    Jan 6 at 1:30

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