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TIFF Revision 5 Info

An Aldus/Microsoft Technical Memorandum: 8/8/88 Page 1 Preface This memorandum has been prepared jointly by Aldus and Microsoft in conjunction with leading scanner vendors and other interested parties. This document does not represent a commitment on the part of either Microsoft or Aldus to provide support for this file format in any application. When responding to specific issues raised in this memo, or when requesting additional tag or field assignments, please address your correspondence to either: Developers' Desk Windows Marketing Group Aldus Corporation Microsoft Corporation 411 First Ave. South 16011 NE 36th Way Suite 200 Box 97017 Seattle, WA 98104 Redmond, WA 98073-9717 (206) 622-5500 (206) 882-8080 Revision Notes This revision replaces "TIFF Revision 4." Sections in italics are new or substantially changed in this revision. Also new, but not in italics, are Appendices F, G, and H. The major enhancements in TIFF 5.0 are: 1. Compression of grayscale and color images, for better disk space utilization. See Appendix F. 2. TIFF Classes - restricted TIFF subsets that can simplify the job of the TIFF implementor. You may wish to scan Appendix G before reading the rest of this document. In fact, you may want to use Appendix G as your main guide, and refer back to the main body of the specification as needed for details concerning TIFF structures and field definitions. 3. Support for "palette color" images. See the TIFF Class P description in Appendix G, and the new ColorMap field description. 4. Two new tags that can be used to more fully define the characteristics of full color RGB data, and thereby potentially improve the quality of color image reproduction. See Appendix H. The organization of the document has also changed slightly. In particular, the tags are listed in alphabetical order, within several categories, in the main body of the specification. As always, every attempt has been made to add functionality in such a way as to minimize incompatibility problems with older TIFF so

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