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Substituting outline fonts for bitmap fonts in archived PDF files

机译：用轮廓字体替换存档的PDF文件中的位图字体

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摘要

As collections of archived digital documents continue to grow the maintenance of an archive, and the quality of reproduction from the archived format, become important long-term considerations. In particular, Adobe's portable document format (PDF) is now an important 'final form' standard for archiving and distributing electronic versions of technical documents. It is important that all embedded images in the PDF, and any fonts used for text rendering, should at the very minimum be easily readable on screen. Unfortunately, because PDF is based on PostScript technology, it allows the embedding of bitmap fonts in Adobe Type 3 format as well as higher-quality outline fonts in TrueType or Adobe Type 1 formats. Bitmap fonts do not generally perform well when they are scaled and rendered on low-resolution devices such as workstation screens. The work described here investigates how a plug-in to Adobe Acrobat enables bitmap fonts to be substituted by corresponding outline fonts using a checksum matching technique against a canonical set of bitmap fonts, as originally distributed. The target documents for our initial investigations are those PDF files produced by (LA)T_EX systems when set up in a default (bitmap font) configuration. For all bitmap fonts where recognition exceeds a certain confidence threshold replacement fonts in Adobe Type 1 (outline) format can be substituted with consequent improvements in file size, screen display quality and rendering speed. The accuracy of font recognition is discussed together with the prospects of extending these methods to bitmap-font PDF files from sources other than (LA)T_EX.
机译：随着已归档数字文档的收集持续增长，对归档的维护以及从已归档格式复制的质量已成为重要的长期考虑因素。尤其是，Adobe的可移植文档格式（PDF）现在是存档和分发技术文档的电子版本的重要“最终形式”标准。重要的是，PDF中所有嵌入的图像以及用于文本渲染的任何字体都应至少在屏幕上易于阅读。不幸的是，由于PDF基于PostScript技术，因此它允许嵌入Adobe Type 3格式的位图字体以及TrueType或Adobe Type 1格式的高质量轮廓字体。在低分辨率设备（例如工作站屏幕）上缩放和渲染位图字体时，它们通常不能很好地工作。此处描述的工作研究了Adobe Acrobat的插件如何使用校验和匹配技术针对原始分布的一组规范的位图字体，用相应的轮廓字体替换位图字体。我们初步调查的目标文档是（LA）T_EX系统使用默认（位图字体）配置设置时生成的PDF文件。对于识别超过一定置信度阈值的所有位图字体，可以用Adobe Type 1（大纲）格式替换替换字体，从而改善文件大小，屏幕显示质量和渲染速度。讨论了字体识别的准确性以及将这些方法扩展到来自（LA）T_EX以外的其他位图字体PDF文件的前景。

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