Just popped in to check status. I haven't moved any closer to a real
solution, unfortunately. I hadn't noticed that larger images would be
cropped - sorry about that. I did vote on the bug, though. Perhaps
next time I check in, I'll have better news.
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I use both Ubuntu and OSX, found that right-clicking on the image in
LibreOffice (in OSX) and selecting Save Graphics allows one to choose
another format.
I know, I know. What would be really useful is if I helped with a fix
for *Ubuntu* - but I have a deadline, and needed a workaround today