OpenType is a new font file format which has been jointly developed by Adobe Systems Inc. and Microsoft Corporation. It is an extension of the TrueType format: OpenType fonts can contain TrueType but also Adobe Type 1 font data. This means that you can have an OpenType font based on:
- An Adobe Type 1 font. The file name of such a font has the suffix .otf.
- A TrueType font. This font still has the .ttf file name suffix.
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OpenType font in Microsoft Windows |
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OpenType font in the Mac OS |
In PDF files, an OpenType font can only appear as an embedded font. So if you are using a Type 1-based OpenType font, you can embed it as Type 1 or as OpenType. Similarly, TrueType-based OpenType fonts can be embedded as TrueType or as OpenType.
OpenType font embedding is a new PDF 1.6 feature, which implies that it might not be supported by the rest of the workflow for the PDF document. For example, earlier versions of Adobe Acrobat may not be able to display the text in OpenType fonts correctly or printing errors can occur.