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On a computer that
is provided with a desktop kind of user interface, wallpaper is the background
pattern or picture against which desktop menus, icons, and other elements are
displayed and moved around. A wallpaper image can be in a JPEG or a GIF file format.
Wallpaper is commonly used in Microsoft Windows, Macintosh Mac OS, Linux, and
in other operating systems as well. Each operating system provides several
pre-installed wallpaper images for the user to choose from. A user can also
choose to download and install third-party wallpapers and use one of these
instead. Typically, a wallpaper image may be centered, stretched, or tiled.
When an image is centered, it is placed in the middle of the desktop and is
surrounded by a solid color. When an image is stretched, it is stretched to
cover all of the desktop. Only certain images can be stretched or they look
distorted. An image that is tiled is placed on the desktop much like tiles are
placed in a shower or a tiled floor. Tiling is commonly used for patterns instead
of photos because a pattern is one square image that repeats itself across and
down the screen, effectively forming a single image.
