That worked. For the sake of the discussion, do you suppose that there was something about this image (like metadata) that would simply not allow it to be compressed any further than the minimum size I described? It would make sense given that the image quality was progressively worse as I experimented with reopening the newly saved and slightly smaller file each time. Even then, I could only get a small reduction in total data quantity but the images became poorer and poorer, as you would expect, as the jpeg options window told me I was getting smaller and smaller. The image started to look like it was capped from somebody's Minecraft screen but the size was still up around a meg.
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