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- Newsgroups: comp.sys.amiga.graphics
- Path: sparky!uunet!newsserver.pixel.kodak.com!jeh
- From: jeh@raster.kodak.com (Ed Hanway)
- Subject: Re: GIF Viewers
- Message-ID: <1992Nov10.125551.3702@pixel.kodak.com>
- Sender: news@pixel.kodak.com
- Organization: Eastman Kodak Company, Digital Systems Center
- X-Newsreader: Tin 1.1 PL5
- References: <1992Nov9.215248.7538@dartvax.dartmouth.edu>
- Date: Tue, 10 Nov 92 12:55:51 GMT
- Lines: 16
-
- Kelvin Leung (abs0@coos.dartmouth.edu) wrote:
- : GIF files are encoded with Huffman code?? mm... I didn't know that...
- : I always thought JPEG was...
-
- GIF files are Lempel-Ziv & Welch (LZW) encoded. It's similar to the
- compression used by archivers of a generation ago, like zoo.
-
- JPEG files are Huffman encoded. Actually, they can use either Huffman
- coding or arithmetic coding, but since IBM has a patent on arithmetic
- coding, few if any applications are going to the trouble of obtaining
- a license under their patent when Huffman coding does nearly as well.
-
- --
- Ed Hanway --- jeh@raster.kodak.com
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