RFC 2531 Content Feature Schema for Internet Fax March 1999 Table of Contents 1. Introduction .............................................3 1.1 Organization of this document............................3 1.2 Terminology and document conventions.....................3 2. Fax feature schema syntax ................................4 3. Internet fax feature tags ................................4 3.1 Image size...............................................5 3.2 Resolution...............................................5 3.3 Media type...............................................6 3.4 Paper Size...............................................6 3.5 Color capability.........................................6 3.6 Color model..............................................8 3.7 Image coding............................................10 4. Examples ................................................12 4.1 Simple mode Internet fax system.........................12 4.2 High-end black-and-white Internet fax system............12 4.3 Grey-scale Internet fax system..........................13 4.4 Full-color Internet fax system..........................13 4.5 Full-color Internet fax system (MRC)....................14 4.6 Sender and receiver feature matching....................15 5. IANA Considerations .....................................17 6. Security Considerations .................................17 6.1 Capability descriptions and mechanisms..................17 6.2 Specific threats........................................18 7. Acknowledgements ........................................18 8. References ..............................................18 9. Authors' Addresses ......................................21 Appendix A: Feature registrations ..........................22 A.1 Image size..............................................22 A.2 Resolution aspect ratio.................................24 A.3 Color levels............................................25 A.4 Color space.............................................27 A.5 CIELAB color depth......................................30 A.6 CIELAB color gamut......................................32 A.7 Image file structure....................................34 A.8 Image data coding.......................................36 A.9 Image coding constraint.................................38 A.10 JBIG stripe size.......................................39 A.11 Image interleave.......................................41 A.12 Color subsampling......................................42 A.13 MRC availability and mode..............................43 A.14 MRC maximum stripe size................................45 Appendix B: TIFF mode descriptions .........................47 Appendix C: Revision history ...............................49 Full Copyright Statement ...................................51 Klyne & McIntyre Standards Track