A family of Microsoft relational database management systems designed for ease of use.
Thanks! It is getting better now but not perfect yet.
I use png-files as backgrounds for technical drawings with Visio 2013.
I found out that smaller paper sizes like A4 now work very good and are not blurry anymore.
Unfortunately the problem is still there when it comes to A1 or A0 paper sizes.
As a workaround i try to split the background in several smaller images now...