![]() ![]() A whole different set of standards define formats for images intended for print publication, and even more were developed for video images. ![]() GIF, JPEG, and PNG remain in wide use today, and they're great for static images. Thanks to its compression, JPEG files can be smaller than images stored in other formats. ![]() At low levels of compression most people wouldn't notice a difference between a JPEG file and a high-resolution original, but with higher compression defects such as posterization appear. In 1992 the Joint Photographic Experts Group published the JPEG standard, which uses a codec to compress and decompress a stream of bytes into a recognizable image. Like GIF, PNG uses lossless compression, but not all computer graphics need to perfectly faithful to an original high-resolution image. That misstep, plus advances in computer graphics in general, led developers to create an improved standard called Portable Network Graphics (PNG) in 1996. Unfortunately, Unisys held the patent on the data compression algorithm in GIF, and when the format became popular, it decided to sue developers who created programs that read and saved GIF files. GIF supports eight bits (256 colors) per pixel, and uses a form of lossless data compression to make image files smaller than they would otherwise be. In 1987 it published a bitmap image format called GIF (graphics interchange format). One of the big competitors to individual bulletin boards was CompuServe. ![]()
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