TIF文件格式说明文档.pdf

发布时间：2022-06-09 发布人：admin 分类：说明书资料大小：0.36M 资料格式：pdf 举报版权申诉

david_cs_dn-2608938-4744302543323537466.pdf-第1页.png

第1页 / 共121页

david_cs_dn-2608938-4744302543323537466.pdf-第2页.png

第2页 / 共121页

david_cs_dn-2608938-4744302543323537466.pdf-第3页.png

第3页 / 共121页

david_cs_dn-2608938-4744302543323537466.pdf-第4页.png

第4页 / 共121页

david_cs_dn-2608938-4744302543323537466.pdf-第5页.png

第5页 / 共121页

david_cs_dn-2608938-4744302543323537466.pdf-第6页.png

第6页 / 共121页

david_cs_dn-2608938-4744302543323537466.pdf-第7页.png

第7页 / 共121页

david_cs_dn-2608938-4744302543323537466.pdf-第8页.png

第8页 / 共121页

Cover

Contents

Introduction

Part 1: Baseline TIFF

Section 1: Notation

Section 2: TIFF Structure

Section 3: Bilevel Images

Section 4: Grayscale Images

Section 5: Palette-color Images

Section 6: RGB Full Color Images

Section 7: Additional Baseline TIFF Requirements

Section 8: Baseline Field Reference Guide

Section 9: PackBits Compression

Section 10: Modified Huffman Compression

Part 2: TIFF Extensions

Section 11: CCITT Bilevel Encodings

Section 12: Document Storage and Retrieval

Section 13: LZW Compression

Section 14: Differencing Predictor

Section 15: Tiled Images

Section 16: CMYK Images

Section 17: HalftoneHints

Section 18: Associated Alpha Handling

Section 19: Data Sample Format

Section 20: RGB Image Colorimetry

Section 21: YCbCr Images

Section 22: JPEG Compression

Section 23: CIE L*a*b* Images

Part 3: Appendices

Appendix A: TIFF Tags Sorted by Number

Appendix B: Operating System Considerations

Index

TIFF Revision 6.0 Final — June 3, 1992 Author/Editor/Arbitrator: Steve Carlsen, Principal Engineer, Aldus Corporation Aldus Developers Desk Aldus Corporation 411 First Avenue South Seattle, WA 98104-2871 CompuServe: GO ALDSVC, Message Section #10 Applelink: Aldus Developers Icon For a copy of the TIFF 6.0 specification, call (206) 628-6593. If you have questions about the contents of this specification, see page 8. 160-640M

TIFF 6.0 Specification Final—June 3, 1992 Copyright 1986-1988, 1992 Aldus Corporation. Permission to copy without fee all or part of this material is granted provided that the copies are not made or distributed for direct commercial advantage and the Aldus copyright notice appears. If the major- ity of the document is copied or redistributed, it must be distributed verbatim, without repagination or reformatting. To copy otherwise requires specific permis- sion from the Aldus Corporation. Licenses and Trademarks Aldus and PageMaker are registered trademarks and TIFF is a trademark of Aldus Corporation. Apple and Macintosh are registered trademarks of Apple Computer, Inc. MS-DOS is a registered trademark of Microsoft Corporation. UNIX is a trademark of Bell Laboratories. CompuServe is a registered trademark of CompuServe Inc. PostScript is a registered trademark of Adobe Systems Inc. and all references to PostScript in this document are references to either the PostScript interpreter or language. Kodak and PhotoYCC are trademarks of Eastman Kodak Company. Rather than put a trademark symbol in every occurrence of other trademarked names, we state that we are using the names only in an editorial fashion, and to the benefit of the trademark owner, with no intention of infringement of the trade- mark. Acknowledgments This specification is the result of much hard work by many people. Some of the sections in Part 2 were written by a number of outside contributors: Ed Beeman, Hewlett Packard Nancy Cam, Silicon Graphics Dennis Hamilton, Xerox Eric Hamilton, C-Cube Sam Leffler, Silicon Graphics Chris and Dan Sears Other primary reviewers and TAC meeting participants include representatives from Apple, Camex, Crosfield, Digital Optics Limited, Frame, IBM, Interleaf, Island Graphics, Kodak, Linotype-Hell, Quark, Sun Microsystems, Time Arts, US West, and Wang. Many thanks to all for lending their time and talents to this effort. No document this large can completely satisfy everyone, but we have all worked hard to strike an effective balance between power and simplicity, between formal- ity and approachability, and between flexibility and constraints. Production Notes This document was created electronically using Aldus PageMaker 4.2. 2

TIFF 6.0 Specification Final—June 3, 1992 Contents Introduction ....................................................................................................................4 About this Specification......................................................................4 Revision Notes.....................................................................................6 TIFF Administration.............................................................................8 Information and Support.........................................................................8 Private Fields and Values.......................................................................8 Submitting a Proposal............................................................................9 The TIFF Advisory Committee...............................................................9 Other TIFF Extensions...........................................................................9 Part 1: Baseline TIFF ....................................................................................................11 Section 1: Notation............................................................................12 Section 2: TIFF Structure...................................................................13 Section 3: Bilevel Images..................................................................17 Section 4: Grayscale Images............................................................22 Section 5: Palette-color Images........................................................23 Section 6: RGB Full Color Images....................................................24 Section 7: Additional Baseline TIFF Requirements........................26 Section 8: Baseline Field Reference Guide.....................................28 Section 9: PackBits Compression....................................................42 Section 10: Modified Huffman Compression...................................43 Part 2: TIFF Extensions ..............................................................................................48 Section 11: CCITT Bilevel Encodings..............................................49 Section 12: Document Storage and Retrieval..................................55 Section 13: LZW Compression.........................................................57 Section 14: Differencing Predictor...................................................64 Section 15: Tiled Images...................................................................66 Section 16: CMYK Images.................................................................69 Section 17: HalftoneHints..................................................................72 Section 18: Associated Alpha Handling...........................................77 Section 19: Data Sample Format......................................................80 Section 20: RGB Image Colorimetry................................................82 Section 21: YCbCr Images ................................................................89 Section 22: JPEG Compression.......................................................95 Section 23: CIE L*a*b* Images........................................................110 Part 3: Appendices ....................................................................................................116 Appendix A: TIFF Tags Sorted by Number....................................117 Appendix B: Operating System Considerations...........................119 Index ............................................................................................................................120 3

TIFF 6.0 Specification Final—June 3, 1992 Introduction About this Specification History Scope This document describes TIFF, a tag-based file format for storing and interchang- ing raster images. The first version of the TIFF specification was published by Aldus Corporation in the fall of 1986, after a series of meetings with various scanner manufacturers and software developers. It did not have a revision number but should have been la- beled Revision 3.0 since there were two major earlier draft releases. Revision 4.0 contained mostly minor enhancements and was released in April 1987. Revision 5.0, released in October 1988, added support for palette color images and LZW compression. TIFF describes image data that typically comes from scanners, frame grabbers, and paint- and photo-retouching programs. TIFF is not a printer language or page description language. The purpose of TIFF is to describe and store raster image data. A primary goal of TIFF is to provide a rich environment within which applica- tions can exchange image data. This richness is required to take advantage of the varying capabilities of scanners and other imaging devices. Though TIFF is a rich format, it can easily be used for simple scanners and appli- cations as well because the number of required fields is small. TIFF will be enhanced on a continuing basis as new imaging needs arise. A high priority has been given to structuring TIFF so that future enhancements can be added without causing unnecessary hardship to developers. 4

TIFF 6.0 Specification Features Final—June 3, 1992 • TIFF is capable of describing bilevel, grayscale, palette-color, and full-color image data in several color spaces. • TIFF includes a number of compression schemes that allow developers to choose the best space or time tradeoff for their applications. • TIFF is not tied to specific scanners, printers, or computer display hardware. • TIFF is portable. It does not favor particular operating systems, file systems, compilers, or processors. • TIFF is designed to be extensible—to evolve gracefully as new needs arise. • TIFF allows the inclusion of an unlimited amount of private or special-purpose information. 5

TIFF 6.0 Specification Final—June 3, 1992 Revision Notes This revision replaces TIFF Revision 5.0. Paragraphs that contain new or substantially-changed information are shown in italics. New Features in Revision 6.0 Clarifications Major enhancements to TIFF 6.0 are described in Part 2. They include: • CMYK image definition • A revised RGB Colorimetry section. • YCbCr image definition • CIE L*a*b* image definition • Tiled image definition • JPEG compression • The LZW compression section more clearly explains when to switch the cod- ing bit length. • The interaction between Compression=2 (CCITT Huffman) and PhotometricInterpretation was clarified. • The data organization of uncompressed data (Compression=1) when BitsPerSample is greater than 8 was clarified. See the Compression field de- scription. • The discussion of CCITT Group 3 and Group 4 bilevel image encodings was clarified and expanded, and Group3Options and Group4Options fields were renamed T4Options and T6Options. See Section 11. Organizational Changes • To make the organization more consistent and expandable, appendices were transformed into numbered sections. • The document was divided into two parts—Baseline and Extensions—to help developers make better and more consistent implementation choices. Part 1, the Baseline section, describes those features that all general-purpose TIFF readers should support. Part 2, the Extensions section, describes a number of features that can be used by special or advanced applications. • An index and table of contents were added. 6

TIFF 6.0 Specification Final—June 3, 1992 Changes in Requirements • To illustrate a Baseline TIFF file earlier in the document, the material from Appendix G (“TIFF Classes”) in Revision 5 was integrated into the main body of the specification . As part of this integration, the TIFF Classes terminology was replaced by the more monolithic Baseline TIFF terminology. The intent was to further encourage all mainstream TIFF readers to support the Baseline TIFF requirements for bilevel, grayscale, RGB, and palette-color images. • Due to licensing issues, LZW compression support was moved out of the “Part 1: Baseline TIFF” and into “Part 2: Extensions.” • Baseline TIFF requirements for bit depths in palette-color images were weak- ened a bit. Changes in Terminology Compatibility In previous versions of the specification, the term “tag” reffered both to the identi- fying number of a TIFF field and to the entire field. In this version, the term “tag” refers only to the identifying number. The term “field” refers to the entire field, including the value. Every attempt has been made to add functionality in such a way as to minimize compatibility problems with files and software that were based on earlier versions of the TIFF specification. The goal is that TIFF files should never become obso- lete and that TIFF software should not have to be revised more frequently than absolutely necessary. In particular, Baseline TIFF 6.0 files will generally be read- able even by older applications that assume TIFF 5.0 or an earlier version of the specification. However, TIFF 6.0 files that use one of the major new extensions, such as a new compression scheme or color space, will not be successfully read by older soft- ware. In such cases, the older applications must gracefully give up and refuse to import the image, providing the user with a reasonably informative message. 7

TIFF 6.0 Specification Final—June 3, 1992 TIFF Administration Information and Support The most recent version of the TIFF specification in PostScript format is available on CompuServe ("Go ALDSVC", Library 10) and on AppleLink (Aldus Devel- opers Icon). Sample TIFF files and other TIFF developer information can also be found at these locations. The Aldus CompuServe forum (Go ALDSVC) can also be used to post messages to other TIFF developers, enabling developers to help each other. Because of the tremendous growth in the usage of TIFF, Aldus is no longer able to provide a general consulting service for TIFF implementors. TIFF developers are encouraged to study sample TIFF files, read TIFF documentation thoroughly, and work with developers of other products that are important to you. Most companies that use TIFF can answer questions about support for TIFF in their products. Contact the appropriate product manager or developer support service group. If you are an experienced TIFF developer and are interested in contract program- ming for other developers, please contact Aldus. Aldus can give your name to others that might need your services. Private Fields and Values An organization might wish to store information meaningful to only that organi- zation in a TIFF file. Tags numbered 32768 or higher, sometimes called private tags, are reserved for that purpose. Upon request, the TIFF administrator (the Aldus Developers Desk) will allocate and register a block of private tags for an organization, to avoid possible conflicts with other organizations. Tags are normally allocated in blocks of five or less. You do not need to tell the TIFF administrator or anyone else what you plan to use them for. Private enumerated values can be accommodated in a similar fashion. For ex- ample, you may wish to experiment with a new compression scheme within TIFF. Enumeration constants numbered 32768 or higher are reserved for private usage. Upon request, the administrator will allocate and register one or more enumerated values for a particular field (Compression, in our example), to avoid possible conflicts. Tags and values allocated in the private number range are not prohibited from being included in a future revision of this specification. Several such instances exist in the TIFF specification. Do not choose your own tag numbers. Doing so could cause serious compatibility problems in the future. 8

分享到：

赞收藏

资料库

TIF文件格式说明文档.pdf

相关推荐

课程资源

热门标签

最新资料