These are pictures and images used as a background
on a computer screen, usually for the background of a graphical user
interface. The term wallpaper is used by Microsoft Windows, while the
Mac OS calls it a background picture. The common resolutions for the
background wallpaper are 800x600, 1024x768, 1280x1024 and 1600x1200,
however they are sometimes available in double-width versions (e.g.
2560×1024) for displaying on multi-monitor computers, where the image
appears to fill two monitors. The most common file types are PNG and
JPEG. Desktop Wallpapers.
Typically, a wallpaper image may be centered, stretched, or tiled. When an image is centered, it is placed in the middle of the background and is surrounded by a solid color. When an image is stretched, it is stretched to cover all of the background. Only certain images can be stretched or they look distorted. An image that is tiled is placed on the background 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.
Photography is the process and art of recording pictures by means of capturing light on a light-sensitive medium, such as a film or an electronic sensor. Light patterns reflected or emitted from objects expose a sensitive silver halide based chemical or electronic medium during a timed exposure, usually through a photographic lens in a device known as a camera that also stores the resulting information chemically or electronically. Photography has many uses for business, science, art and pleasure.
The word "photography" comes from the French photographie which is based on the Greek (phos) "light" + (graphis) "stylus", "paintbrush" or (graphê) "representation by means of lines" or "drawing", together meaning "drawing with light." Traditionally, the product of photography has been called a photograph, commonly shortened to photo.