Documentation issue: Font configuration

[pcarver]

I'm assuming it's a documentation issue. Text on diagrams looks awful even though the exact same font looks fine in LibreOffice. It looks like fonts are being rendered at very low resolution even if the diagram is high resolution (e.g. "seqdiag --size=3200x1800").
Comparing the same text in the same truetype font side by side in LibreOffice and a PNG generated by seqdiag with a high resolution specified by the size parameter, the LibreOffice version is clear and sharp while the PNG is blurry and jagged.
It would be very helpful if the documentation provided more detail on how to control font rendering other than just specifying the -f option on the command line.