Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!wuarchive!decwrl!ucbvax!CAS.BITNET!lwv27 From: lwv27@CAS.BITNET Newsgroups: comp.graphics Subject: New GIF standard available! Message-ID: <9008011858.AA28860@jade.berkeley.edu> Date: 1 Aug 90 18:56:00 GMT Sender: daemon@ucbvax.BERKELEY.EDU Lines: 103 Compuserve has made available in their Graphics Support Forum a new GIF89a document which details the current standards. Here is a bit of info from it (I wasnt able to get it downloaded due to system problems). It is available in Lib 14, the Misc Util & Code library. [76703,704] GIF89A.ARC/binary 01-Aug-90 31637 Accesses: 5 Title : CompuServe's Graphic Interchange Format (tm)- 89a Keywords: GIF GRAPHICS 89A GIF89A DOCUMENT SPECIFICATION COMPUSERVE ARC The official ARC version of CompuServe, Incorporated's Graphic Interchange Format (tm), 89a edition. The Graphics Interchange Format (tm) is the copyright property of CompuServe, Incorporated. CompuServe hereby grants a limited, non-exclusive, royality-free license for the use of GIF. For more information, see the licensing section of the document. [76703,704] GIF89A.DOC 01-Aug-90 85478 Accesses: 1 Title : CompuServe's Graphics Interchange Format (tm)-89a Keywords: GIF GRAPHICS COMPUSERVE GIF89A 89A DOCUMENT SPECIFICATION ASCII The official ASCII version of CompuServe, Incorporated's Graphic Interchange Format (tm), 89a edition. The Graphics Interchange Format (tm) is the copyright property of CompuServe, Incorporated. CompuServe, Incorporated hereby grants a limited, non-exclusive, royality-free, license for the use of GIF. For more information, see the licensing section of the document. An extract from the cover sheet of the document: ---- APPLICATION EXTENSION BLOCK - APPLICATION IDENTIFIER There will be a Courtesy Directory file located on CompuServe in the PICS forum. This directory will contain Application Identifiers for Application Extension Blocks that have been used by developers of GIF applications. This file is intended to help keep developers that wish to create Application Extension Blocks from using the same Application Identifiers. This is not an official directory; it is for voluntary participation only and does not guarantee that someone will not use the same identifier. E-Mail can be sent to Larry Wood (forum manager of PICS) indicating the request for inclusion in this file with an identifier. ---- Note that Mr Wood's CIS id is [76703,704], thus, you should be able to contact him directly by addressing internet type mail to 76703.704@compuserve.co or osu-cis!compuserve.com!76703.704 . ---- The Table of Contents: Disclaimer................................................................. 1 Foreword................................................................... 1 Licensing.................................................................. 1 About the Document......................................................... 2 General Description........................................................ 2 Version Numbers............................................................ 2 The Encoder................................................................ 3 The Decoder................................................................ 3 Compliance................................................................. 3 About Recommendations...................................................... 4 About Color Tables......................................................... 4 Blocks, Extensions and Scope............................................... 4 Block Sizes................................................................ 5 Using GIF as an embedded protocol.......................................... 5 Data Sub-blocks............................................................ 5 Block Terminator........................................................... 6 Header..................................................................... 7 Logical Screen Descriptor.................................................. 8 Global Color Table......................................................... 10 Image Descriptor........................................................... 11 Local Color Table.......................................................... 13 Table Based Image Data..................................................... 14 Graphic Control Extension.................................................. 15 Comment Extension.......................................................... 17 Plain Text Extension....................................................... 18 Application Extension...................................................... 21 Trailer.................................................................... 23 Quick Reference Table...................................................... 24 GIF Grammar................................................................ 25 Glossary................................................................... 27 Conventions................................................................ 28 Interlaced Images.......................................................... 29 Variable-Length-Code LZW Compression....................................... 30 On-line Capabilities Dialogue.............................................. 33 -- Larry W. Virden Business: UUCP: osu-cis!chemabs!lwv27 INET: lwv27%cas.BITNET@CUNYVM.CUNY.Edu Personal: 674 Falls Place, Reynoldsburg,OH 43068-1614 Proline: lvirden@pro-tcc.cts.com America Online: lvirden CIS: [75046,606]