Computer Wallpaper or desktop picture refer to an image used as a background on a computer screen, usually for the desktop of a graphical user interface. Wallpaper is the term used in Microsoft Windows, while the Mac OS calls it a desktop picture. Prior to Mac OS X, the term desktop pattern was used to refer to a small pattern that was repeated to fill the screen. Free computer wallpaper is available for download on the internet in many themes.
Images used as computer wallpaper are usually raster graphics with the same size as the display resolution (for example 1024×768 pixels, or 1280×1024 pixels) in order to fill the whole background. Popular free background themes are Christmas and winter images.
PNG and JPEG image formats are common for wallpaper. Some desktop systems, such as Mac OS , KDE , and GNOME, support vector wallpapers. This has the advantage that a single file may be used for screens of any size, or stretched across several screens, without loss of quality. Most display systems are capable of specifying a single color to use as the background in place of a wallpaper.
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