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发布时间：2006-06-28 04:01     点击：

　　The OSI has protocol standards that define how standard data should be formatted. Tasks like data compression, decompression, encryption, and decryption are associated with this layer. Some Presentation layer standards are involved in multimedia operations too. The following serve to direct graphic and visual image presentation:

　　PICT   A picture format used by Macintosh programs for transferring QuickDraw graphics.

　　TIFF   Tagged Image File Format; a standard graphics format for high-resolution, bitmapped images。

　　JPEG   Photo standards brought to us by The Joint Photographic Experts Group。

　　Other standards guide movies and sound:

　　MIDI   Musical Instrument Digital Interface (sometimes called Musical Instrument Device Interface), used for digitized music.

　　MPEG   Increasingly popular Moving Picture Experts Group standard for the compression and coding of motion vdeo for CDs. It provides digital storage and bit rates up to 1.5Mbps.



　　QuickTime   For use with Macintosh programs; manages audio and video applications.

　　RTF   Rich Text Format, a file format that lets you exchange text files between different word processors, even in different operating systems.

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