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<TITLE>OpenType Overview</TITLE>
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<TD><H1>Developing OpenType</H1></TD>
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<H2>Overview
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<P>The OpenType font format is an extension of the TrueType font format, adding support for PostScript font data. The OpenType font format was developed jointly by Microsoft and Adobe. OpenType fonts and the operating system services which support OpenType fonts provide users with a simple way to install and use fonts, whether the fonts contain TrueType or PostScript information.
<P>The OpenType font format addresses the following goals:<BR>
<UL><LI>broader multi-platform support
<LI>better support for international character sets
<LI>better protection for font data
<LI>streamlined font distribution
<LI>broader support for advanced typographic control</UL>
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<P>OpenType fonts are also referred to as TrueType Open v.2.0 fonts, because they use the TrueType font file format (sfnt), and may use the TrueType Open table extensions. Type 1 data included in OpenType fonts may be directly rasterized or converted to TrueType data for rendering, depending on whether Type 1 rasterization services have been installed in the hosting operating system, but the user model is the same: OpenType fonts just work. Users will not need to be aware of the type of outline data in OpenType fonts. And font creators can use whichever outline format they feel provides the best set of features for their work, without worrying about limiting a font's usability.
<P>OpenType fonts can include the TrueType Open tables, which allow font creators to design better international and high-end typographic fonts. The TrueType Open tables contain information on glyph substitution, glyph positioning, justification, and baseline positioning, enabling text-processing applications to improve text layout.
<P>As with TrueType fonts, OpenType fonts allow the handling of large glyph sets using Unicode encoding. Such encoding allows broad international support, as well as support for typographic glyph variants.
<P>Additionally, OpenType fonts contain a digital signature, which ensures that a font has not been altered since it was originally published. The signature may also contain custom licensee and use information, as issued by a font creator. Such information can be used by the operating system or other services to protect the intellectual property rights of font creators.
<H2>Related Documentation</H2>
The following documents may be consulted for further
information on the TrueType font format and Adobe Type 1 font format:
<DL>
<DT><EM>Compact Font Format Specification, Version 1.0.</EM>
Adobe.
<DT><EM>TrueType 1.0 Font Files, Technical Specification.</EM>
Microsoft.
<DT><EM>TrueType Open Font Specification.</EM> Microsoft.
<DT><EM>Adobe Type 1 Font Format.</EM>
<DD>Addison Wesley, 1991; ISBN 0-201-57044-0.
<DT><EM>Technical Note #5015: "The Type 1 Font Format Supplement."</EM>
<DD>This document contains all updates to the Type 1 format, including the specification of the multiple master font format.
<DT><EM>Technical Note #5087: "Multiple Master Font
Programs for the Macintosh."</EM>
<DT><EM>Technical Note #5088 "Font Naming Issues."</EM>
<DD>In addition to a discussion of
general font name issues, this document explains
the naming conventions for
multiple master fonts.
</DL>
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Microsoft Typography Web Site <A HREF="/truetype/otspec/CPYRIGHT.htm">© 1996 Microsoft Corporation</A>
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Comments to the Microsoft Typography group: <A HREF="mailto:ttwsite@microsoft.com">ttwsite@microsoft.com</A>
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<A HREF="/truetype/default.htm">Home</a> | <a href="/truetype/creators.htm">Information for Developers</a>
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Last updated 05 September 1996
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