Fonts are the essential elements of any portable document format (PDF) file, but are often taken for granted by most readers. But what if you are a developer and fonts are missing? What should you do? Why does this happen? In the first of a two-part white paper series, explore some of the core PDF concepts, font technologies, and get an introduction to the problem of missing fonts in PDF documents.
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etc). At the most basic level, an application that renders PDF documents only needs to access the character codes, the font information, and the mapping from the character code to the font information. With this information the rendering application extracts the key graphical data to draw a glyph on an output device such as a screen or printer. Fonts and Typefaces Although the difference between fonts and typefaces may seem trivial to some, confusion still lingers within some development circles, where