Windows 8 wallpaper quality

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http://superuser.com – So, this is pretty straightforward if you look at the image (http://shrani.si/f/2z/12s/2rLN6lr5/imagetroubles.png): I have a high res 1920x1080 image, and when I set it as wallpaper, it gets very low in quality. I tried to save image as png and bmp and set it as background to no avail. What is going on? How do I change this? (HowTos)