Ever had the feeling your high-resolution desktop wallpaper isn’t looking quite as fantastic as you thought it should? It could be because Windows 10 actually compresses the image, presumably to save space. Windows users have been complaining about the problem for months. Luckily, there is a way to make sure you’re always seeing the best-resolution image on your display.
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Source: How To Stop Windows 10 From Screwing Up Your Gorgeous Wallpaper