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GIF (Graphics Interchange Format) is one of the most popular graphics formats for transferring images over the Web. GIF files are limited to a palette of 256 colors. GIF files contain a table defining the different pixel patterns found in an image, with pointers into the table indicating where the patterns go onscreen. Although GIF files are compressed, none of the original information in the graphic gets lost in the compression process.

Animated GIF's are a special kind of GIF file (known as GIF89a) that contain multiple images that are shown in a sequence at specific times and locations on the screen. A looping option causes your Web browser to keep showing the frames in the GIF file continually, and as a result, you see animation oncreen. There are web sites which contain collections of animated GIF's that can be used such as: http://www.webdeveloper.com/animations/

JPEG(Joint Photographic Experts Group) JPEG images can contain millions of colors. JPEG uses a lossy compression algorithm (meaning that some of the image data can become lost, depending onn how much compression is used when the image is saved) to reduce the amount of space it would otherwise require to store so many colors. JPEG compresses the image by dividing it into tiny cubes and averaging color values within the cubes.