Wallpaper or desktop picture refers to an image used as the desktop background on a computer screen, usually for the desktop of a graphical user interface. The term used in Microsoft Windows is Wallpaper, while the Mac OS calls it a Desktop Background. The wallpaper being use usually depends on you computer screen resolution. It is should be the same size as the display resolution of your screen in order to fill the whole background.
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FullScreen: 1024x768px, 1152x864px, 1280x960px, 1280x1024px, 1400x1050px, 1600x1200px, 1920x1440px, 2048x1536px
HD Ready: 852x480px, 1280x720px, 1366x768px Full HD: 1920x1080 px
WideScreen: 1280x800px, 1440x900px, 1680x1050px, 1920x1200px, 2560x1600px