As described in https://github.com/wbsoft/frescobaldi/issues/277 , sheet music (rendered by LilyPond) is not very well readable at small sizes, due to the fact that the horizontal lines are painted as single black lines and they are slightly offset w.r.t. glyphs that are positioned across these lines. At larger sizes, the problem does not occur. Programs using another poppler backend (such as Evince) do not suffer from this problem, which leads me to thinking it is an issue with the qt4 backend.
(using version 0.20)
to explain the images a little more: the horizontal lines are drawn one pixel too low at small zoom factors.
Can you attach a PDF file that we can use to reproduce the problem?
Created attachment 91357 [details] A pdf file that can demonstrate the issue
Are you using the Arthur or the Splash backend?
I am using the Splash backend (page.renderToImage).
Then assign it to the splash backend :)
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