|Last modified 2001 JUL 31 17:52:40 GMT|
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Here is a link to another list of common Internet File Formats.
.Z UNIX COMPRESS (ONE file compressed) .GZ GZIP (GNU ZIP, freeware/PD, _NOT_ compatible with .ZIP) .ZIP PKZIP or INFOZIP (PKZIP is the originator of the format, and INFOZIP is a PD implementation with source available for producing the program on various platforms). .LZH A fairly popular compressed file format. From Japan. .ARJ Yet another fairly popular compressed file format. .ARC An older compressed file standard. ZIP is much better, but you'll probably still encounter these files. .TAR Tape ARchive format. A UNIX backup, any file may include compression, but TAR doesn't imply "compressed". I've yet to find a good TAR implementation for the PC. If you do, drop me a line. .GIF Graphics file. Max 256 colours (8 bit). This is a common file type, originally developed by CompuServe. Unfortunatley, Unisys owns the patent to the compression algorythm used in the format, and has been demanding royalties for its use, so expect the use of this to start dropping off. .JPG .JPEG Graphics file. Max 16M colours (24 bit). Popular in picture groups, because it compresses very well ("lossy compression"), and supports 24 bit colour. Also used in many graphically-rich web pages. They tend to be smaller than a GIF file, and better quality (more colours), but the decompression time (to make the file viewable) takes much longer than for GIF. .MPG .MPE .MPEG Compressed animated video file. Requires a viewer application, or a browser which properly supports MPEG. .XBM .XPM Bitmap (black and white), and pixelmap (colour) files respectively. They're supposed to be supported by most web browsers, much like a GIF file, but one doesn't come across them too frequently. .HTM .HTML WWW file -- view with your WWW viewer. .HTML is the official form, but .HTM is the common abbreviation for PC systems which limit the extension to 3 characters. .AU Audio file (gernerally speaking, the UNIX equivalent of .WAV). The Windows sound recorder won't touch this. NetCruiser v1.60 supports playing these (either as file attachments in Mail, or from WWW). .UUE Often used to refer to a UUEncoded file. UUEncoding is a way of converting a binary (8 bits per character) file into a text (6 bits per character) file. This involves taking two characters from the binary file (16 bits) and making three characters in the uuencoded output file (18 bits, but they REALLY TAKE 24 bits). This may seem like a waste of space (and it is), but it makes files compatible with the old network standards in place on the Internet.
I found a FAQ on graphic file types. Here it is: Graphics File Formats FAQ
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