Apple Advanced Typography - Features

Features

Significant features of AAT currently include:

  • Several degrees of ligature control
  • Keshideh justification and joiners
  • Cross-stream kerning (required for Nasta'liq Urdu, for example)
  • Indic vowel rearrangement
  • Independently controllable substitution of:
    • Old style figures
    • Small caps and drop caps
    • Swash variants
    • Alternative glyphs:
      • Individual alternatives on a per-glyph basis
      • Wholesale alternatives, such as engraved text
    • Anything else the font designer wants to add
  • Glyph variation axes

AAT font features are supported on Mac OS 8.5 and above, including OS X and also on several open-source operating systems such as Linux via IBM's ICU library.

Read more about this topic:  Apple Advanced Typography

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