Network Working Group Glenn Parsons Internet Draft James Rafferty Expires in six months September 22, 1997 Tag Image File Format (TIFF) - image/tiff-f MIME Sub-type Registration Status of this Memo This document is an Internet Draft. Internet Drafts are working documents of the Internet Engineering Task Force (IETF), its Areas, and its Working Groups. Note that other groups may also distribute working documents as Internet Drafts. Internet Drafts are valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet Drafts as reference material or to cite them other than as a "work in progress". To learn the current status of any Internet-Draft, please check the "1id-abstracts.txt" listing contained in the Internet-Drafts Shadow Directories on ftp.is.co.za (Africa), nic.nordu.net (Europe), munnari.oz.au (Pacific Rim), ds.internic.net (US East Coast), or ftp.isi.edu (US West Coast). Overview This document describes the registration of the MIME sub-type image/tiff-f. The baseline encoding is defined by [TIFF-F]. Internet Fax Working Group This document is a product of the IETF Internet Fax Working Group. All comments on this document should be forwarded to the email distribution list at . Internet Draft image/tiff-f September 22, 1997 1. Abstract This document describes the registration of the MIME sub-type image/tiff-f. The baseline encoding is defined by [TIFF]. 2. TIFF-F Definition The Application F of TIFF (Tag Image File Format) is defined in detail . The intended usage of this application content is for bi-level facsimile images. 3. MIME Definition for TIFF-F 3.1 image/tiff-f The image/tiff-f sub-type is defined to contain only TIFF-F fax content as defined in [TIFF-F]. It is recommended that applications which read and writeTIFF-F encoded fax images use this MIME content type. Applications can then uniquely identify the contents as a TIFF-F image. 3.2 image/tiff The image/tiff sub-type previously defined in RFC 1528 as containing TIFF 5.0 encoded image data was redefined in [TIFFREG] to refer to TIFF 6.0 encoded image data. The TIFF 6.0 specification [TIFF] is a cleaner document and is compatible with previous TIFF 5.0 encoded image data. TIFF-F is a derivative of TIFF and as a result is a valid encoding for this content. Applications may choose to use this more generic content type for TIFF-F image data if the unique identification of TIFF-F data is not important. The image/tiff-f MIME content type is functionally equivalent to "image/tiff;application=f", where application is an optional parameter. The image/tiff-f content type permits TIFF-F image data to be uniquely identified using a MIME type and subtype, so that the application parameter (i.e. application=f) is not needed in this case. Parsons, Rafferty Expires 03/22/98 [Page 2] Internet Draft image/tiff-f September 22, 1997 4. IANA Registration To: ietf-types@iana.org Subject: Registration of Standard MIME media type image/tiff-f MIME media type name: image MIME subtype name: tiff-f Required parameters: none Optional parameters: none Encoding considerations: Binary or Base-64 generally preferred Security considerations: none Interoperability considerations: The ability of implementations to handle all the defined applications of TIFF may not be ubiquitous. As a result, the absence of the application parameter would force implementations to decode and attempt to display the encoded TIFF image data in order to determine if it could actually be viewed. Published specification: TIFF (Tag Image File Format) - Application F is defined in . Applications which use this media type: Imaging, fax, messaging and multi-media Additional information: Note that the same file identifiers as TIFF are recommended for use with TIFF-F. Magic number(s): II (little-endian): 49 49 42 00 hex MM (big-endian): 4D 4D 00 42 hex File extension(s): .TIF Macintosh File Type Code(s): TIFF Person & email address to contact for further information: Glenn W. Parsons Glenn.Parsons@Nortel.ca Parsons, Rafferty Expires 03/22/98 [Page 3] Internet Draft image/tiff-f September 22, 1997 James Rafferty Jrafferty@worldnet.att.net Intended usage: COMMON Change controller: James Rafferty 5. Authors' Addresses Glenn W. Parsons Northern Telecom P.O. Box 3511, Station C Ottawa, ON K1Y 4H7 Canada Phone: +1-613-763-7582 Fax: +1-613-763-2697 Email: Glenn.Parsons@Nortel.ca James Rafferty Human Communications 12 Kevin Drive Danbury, CT 06811-2901 USA Phone: +1-203-746-4367 Fax: +1-203-746-4367 Email: Jrafferty@worldnet.att.net 6. References [MIME1] N. Freed and N. Borenstein, "Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies", RFC 2045, Innosoft, First Virtual, Nov 1996 [MIME4] N. Freed and N. Borenstein, "Multipurpose Internet Mail Extensions (MIME) Part Four: Registration Procedures", RFC 2048, Innosoft, First Virtual, Nov 1996. [TIFF-F] G. Parsons and J. Rafferty, " Tag Image File Format (TIFF) - Application F", , September 1997. [TIFFREG] G. Parsons, J. Rafferty and S. Zilles, "Tag Image File Format (TIFF) - image/tiff: MIME Sub-type Registration ", Work In Progress, , September, 1997. Parsons, Rafferty Expires 03/22/98 [Page 4]