Apple Advanced Typography (AAT) is Apple Inc's computer software for advanced font rendering, supporting internationalization and complex features for typographers, a successor to Apple's little-used QuickDraw GX font technology of the mid-1990s. It is a set of extensions to the TrueType outline font standard, with similar smartfont features to the OpenType font format that was developed by Adobe and Microsoft, and the open source Graphite. It also incorporates concepts from Adobe's "multiple master" font format, allowing for axes of traits to be defined and morphing of a glyph independently along each of these axes. AAT font features do not alter the underlying typed text, they only affect the characters' representation during glyph conversion.
Read more about Apple Advanced Typography: Features, AAT and OpenType in OS X, AAT Layout, AAT For Indic Scripts
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