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Image types:
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GIF - Color image format where each pixel is represented from 1-8 bits. Compressed to a very compact size for images with not many colors.
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JPEG - Color image format where each pixel represented by 24 bits, giving so-called "true color". Also compressed for reasonable sizes of images with high-resolution, photographic quality.
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PNG - new portable networks graphics format designed for web
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Audio types:
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Basic audio types are au and snd, supported by most audio players. The entire audio file is downloaded before it is played.
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RealAudio - ram - a format which allows the plug-in to play the audio file as it is downloaded.
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Video types:
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Quicktime - Apple video format supports synchronized audio and video and has compression schemes.
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MPEG - is most videly used but is not synchronized. Compression scheme records differences between frames.
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Motion JPEG
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