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RFC 3949

 
 
 

File Format for Internet Fax

Part 4 of 4, p. 74 to 84
Prev RFC Part

 


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9.  MIME content-types image/tiff and image/tiff-fx

   The MIME content-types image/tiff and image/tiff-fx are used for
   TIFF-FX encoded image data, as defined in this document.  [TIFF-REG]
   and [TIFF-FX-REG] describe the registration of these MIME content-
   types.

10.  Security Considerations

   This document describes a file format for Internet fax, which is a
   series of profiles of TIFF for facsimile.  As such, it does not
   create any security issues not already identified in [TIFF-REG], in
   its use of fields as defined in [TIFF].  There are also new TIFF
   fields defined within this specification, but they are of a purely
   descriptive nature, so no new security risks are incurred.

   Further, the encoding specified in this document does not in any way
   preclude the use of any Internet security protocol to encrypt,
   authenticate, or non-repudiate TIFF-encoded facsimile messages.

11.  References

11.1.  Normative References

   [REQ]         Bradner, S., "Key words for use in RFCs to Indicate
                 Requirement Levels", BCP 14, RFC 2119, March 1997.

   [T.4]         ITU-T Recommendation T.4, Standardization of group 3
                 facsimile apparatus for document transmission, October
                 1997.

   [T.6]         ITU-T Recommendation T.6, Facsimile coding schemes and
                 coding control functions for group 4 facsimile
                 apparatus, November 1988

   [T.30]        ITU-T Recommendation T.30 - Procedures for Document
                 Facsimile Transmission in the General Switched
                 Telephone Network, June 1996

   [T.42]        ITU-T Recommendation T.42, Continuous-tone colour
                 representation method for facsimile, February 1996

   [T.43]        ITU-T Recommendation T.43, Colour and gray-scale image
                 representations using lossless coding scheme for
                 facsimile, February 1997

   [T.44]        ITU-T Recommendation T.44, Mixed Raster Content (MRC),
                 April 1999.

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   [T.81]        ITU-T Recommendation T.81, Information technology -
                 Digital compression and coding of continuous-tone still
                 images - Requirements and guidelines, September 1992

   [T.85]        ITU-T Recommendation T.85, Application profile for
                 Recommendation T.82 - Progressive bi-level image
                 compression (JBIG coding scheme) for facsimile
                 apparatus, August 1995

   [T.82]        ITU-T Recommendation T.82, Information technology -
                 Coded representation of picture and audio information -
                 Progressive bi-level image compression, March 1995

   [TIFF]        Tag Image File Format, Revision 6.0, Adobe Developers
                 Association, June 3, 1992,
                 http://partners.adobe.com/public/developers/en/tiff/
                 TIFF6.pdf

                 The TIFF 6.0 specification dated June 3, 1992
                 specification (c) 1986-1988, 1992 Adobe Systems
                 Incorporated. All Rights Reserved.

   [TIFF-F0]     TIFF Class F specification, Apr 28, 1990,
                 ftp://ftp.faximum.com/pub/documents/tiff_f.txt

   [TIFF-REG]    Parsons, G. and J. Rafferty, "Tag Image File Format
                 (TIFF) - image/tiff MIME Sub-type Registration", RFC
                 3302, September 2002.

   [TTN1]        Adobe PageMaker 6.0 TIFF Technical Notes, Sept. 14,
                 1995,
                 http://partners.adobe.com/public/developers/en/tiff/
                 TIFFPM6.pdf

   [TTN2]        Draft TIFF Technical Note 2, Replacement TIFF/JPEG
                 specification, March 17, 1995,
                 ftp://ftp.uu.net/graphics/jpeg/

   [TIFF-FX-REG] McIntyre, L., Parsons, G., and J. Rafferty, "Tag Image
                 File Format Fax eXtended (TIFF-FX) - image/tiff-fx MIME
                 Sub-type Registration", RFC 3250, September 2002.

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11.2.  Informative References

   [GUIDE]       Cancio, V., Moldovan, M., Tamura, H., and D. Wing,
                 "Implementers Guide for Facsimile Using Internet Mail",
                 RFC 3249, September 2002.

   [TIFF-F]      Parsons, G. and J. Rafferty, "Tag Image File Format
                 (TIFF) - F Profile for Facsimile", RFC 2306, March
                 1998.

   [VPIM 2]      Vaudreuil G. and G. Parsons, "Voice Profile for
                 Internet Mail - version 2 (VPIMv2)", RFC 3801, June
                 2004.

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Annex A:  Summary of TIFF Fields for Internet Fax

   This annex includes tables which list by profile the TIFF fields used
   in the proposed fax file format.  The fields are organized into 3
   categories:

      1)  TIFF Baseline Fields
      2)  TIFF Extension Fields
      3)  New Fields.

   The tables include the allowed values for each fax profile.  Entries
   other than explicit numbers are described by:

      n        - single number
      n, m     - 2 numbers
      a, b, c  - 3 numbers
      r        - rational number
      <n>      - array of numbers
      <b>      - byte sequence
      {ASCII}  - string
      IFD      - IFD byte offset
      <IFD>    - array of IFD byte offsets

   A blank entry in the table indicates that the field is not used by
   that particular fax profile.

   Table A.1  TIFF Baseline Fields

           +---------------------------------------------------------+
           |                       Fax Profile                       |
           +---------------------------------------------------------|
           | Minimal | Extended |  JBIG  |  Lossy  |Lossless| Mixed  |
+----------|   B&W   |    B&W   |  B&W   |  Color  | Color  | Raster |
|   TIFF   |         |          |        |         |        | Content|
|  Field   |    S    |     F    |   J    |    C    |   L    |   M    |
+----------+---------+----------+--------+---------+--------+--------+
| BitsPer  | 1       | 1        | 1      | 8       | 1, 2-8 | 1, 2-8 |
| Sample   |         |          |        |         | 9-12   | 9-12   |
+----------+---------+----------+--------+---------+--------+--------+
| Compres- | 3       | 3, 4     | 9      | 7       | 10     | 3, 4, 7|
| sion     |         |          |        |         |        | 9,10   |
+----------+---------+----------+--------+---------+--------+--------+
| DateTime |         | {ASCII}  | {ASCII}| {ASCII} | {ASCII}| {ASCII}|
+----------+---------+----------+--------+---------+--------+--------+
| FillOrder| 2       | 1, 2     | 1, 2   | 1, 2    | 1, 2   | 1,2    |
+----------+---------+----------+--------+---------+--------+--------+

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+----------+---------+----------+--------+---------+--------+--------+
| ImageDes-|         | {ASCII}  | {ASCII}| {ASCII} | {ASCII}| {ASCII}|
| cription |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Image-   | n       | n        | n      | n       | n      | n      |
| Length   |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Image-   | 1728    | 1728, 2048, 2432  |   864, 1024, 1216, 1728,  |
| Width    |         | 2592, 3072, 3456  |  2048, 2432, 2592, 3072,  |
|          |         | 3648, 4096, 4864  |  3456, 3648, 4096, 4864   |
|          |         | Note, for the Mixed Raster Content M profile  |
|          |         | these widths apply to the Primary IFD.        |
+----------+---------+----------+--------+---------+--------+--------+
| NewSub-  | 2       | 2        | 2      | 2       | 2      | 16, 18 |
| FileType |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Orien-   | 1       | 1-8      | 1-8    | 1-8     | 1-8    | 1-8    |
| tation   |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Photo-   | 0       | 0, 1     | 0, 1   | 10      | 2, 5,  | 0,     |
| metric-  |         |          |        |         | 10     | 2,     |
| Interp-  |         |          |        |         |        | 10     |
| retation |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Resolu-  | 2       | 2, 3     | 2, 3   | 2, 3    | 2, 3   | 2, 3   |
| tionUnit |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| RowsPer- | n       | n        | n      | n       | n      | n      |
| Strip    |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Samples- | 1       | 1        | 1      | 1, 3    | 1, 3, 4| 1, 3, 4|
| PerPixel |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Software |         | {ASCII}  | {ASCII}| {ASCII} | {ASCII}| {ASCII}|
+----------+---------+----------+--------+---------+--------+--------+
| Strip-   | n       | <n>      | <n>    | <n>     | <n>    | <n>    |
| Byte-    |         |          |        |         |        |        |
| Counts   |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Strip-   | n       | <n>      | <n>    | <n>     | <n>    | <n>    |
| Offsets  |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| XResolu- | 204     | 200, 204, 300     |    100, 200, 300, 400     |
| tion     | 200     | 400, 408          |                           |
+----------+---------+----------+--------+---------+--------+--------+
| YResolu- | 98, 196 | 98, 196, 100, 200 |    100, 200, 300, 400     |
| tion     | 100,200 | 300, 391, 400     |                           |
+----------+---------+----------+--------+---------+--------+--------+

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   Table A.2  TIFF Extension Fields

           +---------------------------------------------------------+
           |                       Fax Profile                       |
           +---------------------------------------------------------|
           | Minimal | Extended |  JBIG  |  Lossy  |Lossless| Mixed  |
+----------|   B&W   |    B&W   |  B&W   |  Color  | Color  | Raster |
|   TIFF   |         |          |        |         |        | Content|
|  Field   |    S    |     F    |   J    |    C    |   L    |   M    |
+----------+---------+----------+--------+---------+--------+--------+
| Chroma-  |         |          |        | 1       |        | 1      |
| Position-|         |          |        |         |        |        |
| ing      |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Chroma-  |         |          |        | <1, 1>  |        | <1, 1> |
| SubSampl-|         |          |        | <2, 2>  |        | <2, 2> |
| ing      |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Document-|         | {ASCII}  | {ASCII}| {ASCII} | {ASCII}| {ASCII}|
| Name     |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Indexed  |         |          |        |         | 0,1    | 0,1    |
+----------+---------+----------+--------+---------+--------+--------+
| Page-    | n, m    | n, m     | n, m   | n, m    | n, m   | n, m   |
| Number   |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| SubIFDs  |         |          |        |         |        | <IFD>  |
+----------+---------+----------+--------+---------+--------+--------+
| T4Options| 0, 4    | 0, 1,    |        |         |        | 0, 1,  |
|          |         | 4, 5     |        |         |        | 4, 5   |
+----------+---------+----------+--------+---------+--------+--------+
| T6Options|         | 0        |        |         |        | 0      |
+----------+---------+----------+--------+---------+--------+--------+
| XPosition|         |          |        |         |        | r      |
+----------+---------+----------+--------+---------+--------+--------+
| YPosition|         |          |        |         |        | r      |
+----------+---------+----------+--------+---------+--------+--------+

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   Table A.3   New Fields

           +---------------------------------------------------------+
           |                       Fax Profile                       |
           +---------------------------------------------------------|
           | Minimal | Extended |  JBIG  |  Lossy  |Lossless| Mixed  |
+----------|   B&W   |    B&W   |  B&W   |  Color  | Color  | Raster |
|   TIFF   |         |          |        |         |        | Content|
|  Field   |    S    |     F    |   J    |    C    |   L    |   M    |
+----------+---------+----------+--------+---------+--------+--------+
| BadFax-  |         | n        |        |         |        |        |
| Lines    |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| CleanFax-|         | 0, 1, 2  |        |         |        |        |
| Data     |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Coding-  |         |          | n      | n       | n      | n      |
| Method   |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Consecu- |         | n        |        |         |        |        |
| tiveBad- |         |          |        |         |        |        |
| FaxLines |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Decode   |         |          |        | <r>     | <r>    | <r>    |
+----------+---------+----------+--------+---------+--------+--------+
| Fax-     |         |          | n      | n       | n      | n      |
| Profile  |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Global-  |         | IFD      | IFD    | IFD     | IFD    | IFD    |
| Parame-  |         |          |        |         |        |        |
| tersIFD  |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Image-   |         |          |        |         |        | n, m   |
| Layer    |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| T82-     |         |          | n      |         |        | n      |
| Options  |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Image-   |         |          |        |         |        | <n>    |
| BaseColor|         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Mode-    |         |          |        |         |        | n      |
| Number   |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------|
| Profile- |         |          | n      | n       | n      | n      |
| Type     |         |          |        |         |        |        |
+--------------------------------------------------------------------+

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+----------+---------+----------+--------+---------+--------+--------+
| Strip-   |         |          |        |         |        | <n>    |
| RowCounts|         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+
| Version- |         |          |        | <b>     |<b>     |        |
| Year     |         |          |        |         |        |        |
+----------+---------+----------+--------+---------+--------+--------+

Annex B: List of technical edits to RFC2301

   This Annex lists technical differences between this document and
   RFC 2301, the Proposed Standard File Format for Internet Fax.

+----+---------+-------------------------------------------------+
| No.| Section |             Technical Edit                      |
+----+---------+-------------------------------------------------+
| 1. | 5.2.1   | Added FillOrder=1 to Profile J                  |
+----+---------+-------------------------------------------------+
| 2. | 6.2.1   | Constrained ResolutionUnit to 2 (i.e., inch) for|
|    | 7.2.1   | all color profiles, per ITU-T Recommendations   |
|    | 8.2.1   |                                                 |
+----+---------+-------------------------------------------------+
| 3. | 7.2.1   | Deleted ColorMap field; it re-encoded the color |
|    | 7.4     | palette already in the T.43 data stream         |
+----+---------+-------------------------------------------------+
| 4. | 7.2.2   | Changed TAG value of Indexed field from 364 to  |
|    |         | 346 to agree with Section 8.2.2 and Ref. [TTN1] |
+----+---------+-------------------------------------------------+
| 5. | 8.2.1   | Added text clarifying the use of ImageWidth     |
|    |         | when Background or Foreground layer is Primary  |
|    |         | IFD                                             |
+----+---------+-------------------------------------------------+
| 6. | 8.2.3   | Changed field name from DefaultImageColor to    |
|    |         | ImageBaseColor;                                 |
+----+---------+-------------------------------------------------+
| 7. | 8.2.1   | Added Compression=1 for ImageBaseColor IFDs     |
+----+---------+-------------------------------------------------+
| 8. | 5.2.1   | Redefined compression = 9 to be T.82 (JBIG);    |
|    | 5.2.3   | added T82Options field, with a default value (0)|
|    |         | corresponding to the T.85 application profile   |
+----+---------+-------------------------------------------------+
| 9. | 4.3.3   | Added GlobalParametersIFD, ProfileType,         |
|    | 4.7     | FaxProfile and CodingMethod to the New Fields   |
|    |         | portion of Profile F, per Sec. 2.2.4            |
+----+---------+-------------------------------------------------+

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+----+---------+-------------------------------------------------+
| 10.|  6.2.1  | Deleted BitsPerSample=12 as an option when      |
|    |6.2.3,6.4| Compression=7 due to lack of interop testing.   |
|    |Table A.1|                                                 |
+----+---------+-------------------------------------------------+
| 11.|8.2.1,8.4| Deleted PhotometricInterpretation=5 in Profile M|
|    |Table A.1| due to insufficient interop testing.            |
+----+---------+-------------------------------------------------+
| 12.|7.2.1,7.4| Deleted BitsPerSample=13-16 for Palette-color   |
|    |8.2.1,8.5| due to lack of interop testing.                 |
|    |Table A.1|                                                 |
+----+---------+-------------------------------------------------+
| 13.| Annex B | Deleted Annex B due to discontinued use of      |
|    |         | application parameter; Annex C renamed Annex B  |
+----+---------+-------------------------------------------------+

Authors' Addresses

   Robert Buckley
   Xerox Corporation
   Mailstop 0128-30E
   800 Phillips Road
   Webster, NY 14580, USA

   Phone: +1-585-422-1282
   Fax:   +1-585-422-2636
   EMail: rbuckley@crt.xerox.com


   Dennis Venable
   Xerox Corporation
   Mailstop 0128-27E
   800 Phillips Road
   Webster, NY 14580, USA

   Phone: +1-585-422-3138
   Fax:   +1-585-422-6117
   EMail: dvenable@crt.xerox.com

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   Lloyd McIntyre
   10328 S. Stelling Road
   Cupertino, CA 95014 USA

   Phone: +1-408-725-1624
   EMail: lloyd10328@pacbell.net or
          Lloyd_McIntyre@Dell.com


   Glenn W. Parsons
   Nortel Networks
   P.O. Box 3511, Station C
   Ottawa, ON K1Y 4H7, Canada

   Phone: +1-613-763-7582
   Fax:   +1-613-967-5060
   EMail: gparsons@nortel.com


   James Rafferty
   Brooktrout Technology
   410 First Avenue
   Needham, MA 02494 USA

   Phone: +1-781-433-9462
   Fax:   +1-781-433-9268
   EMail: jraff@brooktrout.com

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