Hi,
I can’t tell you the reason and I don’t know how to solve it.
But here is another example:
http://lilypondblog.org/wp-content/uploads/2014/01/ornaments.png
It also shows that the rendering of symbols is not perfect in default
LilyPond. The Feta clef (left) gives a bad impression (visible pixels)
while the clef from a different font (Bravura, right) looks much
smoother. The same holds for all symbols in this comparison.
More infos: This was done with version 2.18, export as png with 150 dpi
(I know that it would look better with 300 or 600 dpi, but that’s not
the point.)
So I join the question: What is wrong here? How can it be improved?
Cheers,
Joram