ISO_IEC 14496-22-2007 信息技术.视听对象的编码.第22部分_开放字型格式.pdf

标准号：ISO/IEC 14496-22-2007
实施状态：作废
中文名称：信息技术.视听对象的编码.第22部分:开放字型格式
英文名称：Information technology - Coding of audio-visual objects - Part 22: Open Font Format
发布日期：2007-03
被替代标准：ISO/IEC 14496-22-2009
代替标准：ISO/IEC FDIS 14496-22-2006
采用标准：CAN/CSA-ISO/IEC 14496-22-07-2007,IDT
起草单位：ISO/IEC JTC 1/SC 29
标准简介：This International Standard specifies the Open Font Format (OFF) specification, the TrueType™1) and
Compact Font Format (CFF) outline formats, and the TrueType hinting language. Many references to both
TrueType and PostScript®2) exist throughout this document, as Open Font Format fonts combine the two
technologies.
NOTE This International Standard is based on the OpenType®3) version 1.4 font format specification, and is
technically equivalent to that specification.
Multimedia applications require a broad range of media-related standards. In addition to the typical audio and
video applications, multimedia presentations include scalable 2D graphics and text supporting all languages of
the world. Faithful reproduction of scalable multimedia content requires additional components including
scalable font technology. The Open Font Format is an extension of the TrueType font format, adding support
for PostScript font data. OFF fonts and the operating system services which support OFF fonts provide users
with a simple way to install and use fonts, whether the fonts contain TrueType outlines or CFF (PostScript)
outlines.
The Open Font Format addresses the following goals:
- broader multi-platform support;
- excellent support for international character sets;
- excellent protection for font data;
- smaller file sizes to make font distribution more efficient;
- excellent support for advanced typographic control.
PostScript data included in OFF fonts may be directly rasterized or converted to the TrueType outline format
for rendering, depending on which rasterizers have been installed in the host operating system. But the user
model is the same: OFF fonts just work. Users will not need to be aware of the type of outline data in OFF
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.
OFF fonts can include the OFF Layout tables, which allow font creators to design broader international and
high-end typographic fonts. The OFF Layout tables contain information on glyph substitution, glyph positioning,
justification and baseline positioning, enabling text-processing applications to improve text layout.
As with TrueType fonts, OFF 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.
Additionally, OFF fonts may contain digital signatures, which allow operating systems and browsing
applications to identify the source and integrity of font files, including embedded font files obtained in web
documents, before using them. Also, font developers can encode embedding restrictions in OFF fonts which
cannot be altered in a font signed by the developer.
文件格式：PDF
文件大小：2.86MB
文件页数：436
（以上信息更新时间为：2019-11-22）



文档语言及版本参照下方封面截图：