The bitmap images generated by the digitized image of today are often represented in the format of three bytes per pixel, resulting in a large and difficult bitmap. Many compression systems have been developed to reduce these storage. By the Compu Serve the development of GIF (Graphic Interchange Format) system by putting may be assigned to a pixel color was reduced to only 256 a number of methods to research the problem, this means that the value of each pixel can not with three bytes in a byte. Each of the 256 possible pixel values can be linked to a combination of red, green, and blue with a table called a palette. By changing the palette that corresponds to an image, you can change the color of the image. One of the colors in the GIF image palette is often assigned "transparent" values, which means that the background is allowed to be displayed in any area that has been specified for this "color". Another color image compression technique is JPEG, which is developed by the JOINT Photographic Experts Group (an organization in ISO). JPEG has become an effective standard for color images. JPEG standards actually include several imaging methods, each with its own goals.

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The JPEG Still Picture Compression Standard.pdf

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