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(This should maybe be a comment, but I'm posting as an answer for better formatting.) I just discovered the following:

sage: r.eval('capabilities("png")')
'  png \nFALSE '
sage: r.eval('capabilities("X11")')
' X11 \nTRUE '

So apparently, I have X11 support, but not PNG support. Does that suggest anything that I might be able to do?