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If you are not sure what a Gif is, here is Wikipedia’s profile:
The Graphics Interchange Format (better known by its acronym GIF /ˈdʒɪf/ jif or /ˈɡɪf/ ghif). A GIF is a bitmap image format that was introduced by CompuServe in 1987.. The GIF has since come into widespread usage on the World Wide Web due to its wide support and portability.
The format supports up to 8 bits per pixel for each image. Furthermore, this allows a single image to reference its own palette of up to 256 different colors. The palette is chosen from the 24-bit RGB color space. It also supports animations and allows a separate palette of up to 256 colors for each frame. These palette limitations make the GIF format less suitable for reproducing color photographs and other images with continuous color. Yet it is well-suited for simpler images such as graphics or logos with solid areas of color.
Furthermore, GIF images are compressed using the Lempel–Ziv–Welch (LZW) lossless data compression technique. Also this technique is to reduce the file size without degrading the visual quality. This compression technique was patented in 1985. Controversy over the licensing agreement between the software patent holder, Unisys, and CompuServe in 1994 spurred the development of the Portable Network Graphics (PNG) standard. By 2004 all the relevant patents had expired