- 
      PostScript
      Type1
      
    
- 
      PostScript Multiple Master
      
    
- 
      CID
      keyed fonts
    
- 
      PostSript
      Type2
      
    
- 
      PostScript Type3
      
    
- 
      PostScript Type14 (Chameleon)
      
	- 
	  The PLRM (5.8.1) documents that this font format is undocumented.
      
 
- 
      PostScript
      Type42
    
- 
      Adobe
      Feature File (fea)
      
	- 
	  (FontForge's implementation of this format
	  is a superset of what Adobe accepts, and a superset of what Adobe documents.
	  Neither can completely describe opentype. Adobe claims they will update the
	  feat spec in late 2007).
      
 
- 
      AFM
    
- 
      PFM
      
    
- 
      NTF
      
	- 
	  This format is supposed to replace the pfm files above in windows >2000.
	  I can't find any docs on it.
      
 
- 
      BDF
      
    
- 
      True Type Standard
 (Sadly different sources have slightly different definitions of less important
      parts of the standard, be warned)
	- 
	  Apple (I find Apple's
	  prose difficult, and sometimes misleading. I suggest using a different source
	  when possible)
	
- 
	  Microsoft
	
- 
	  random useful site
	
- 
	  TTC
	  -- True Type Font Collection
      
 
- 
      Apple
      Advanced Typography extensions to TrueType
    
- 
      Apple distortable font (variation tables) -- vaguely equivalent to Multiple
      Master fonts for TrueType
      
	- 
	  fvar
	  (font variations)
	
- 
	  gvar
	  (glyph variations)
	
- 
	  cvar
	  (cvt variations)
	
- 
	  avar
	  (axis variations)
      
 
- 
      OpenType (postscript embedded in a truetype wrapper,
      or advanced typography tables in a truetype wrapper)
      
    
- 
      Open Font Format Specification (ISO/IEC 14496-22:2007)
 (based on OpenType 1.4 but an international standard)
- 
      Apple's
      sfnt wrapper around a PS type1 font
    
- 
      Various bitmap only sfnt formats
    
- 
      WOFF
      -- Web Open Font Format, mozilla's compressed sfnt format
    
- 
      PostScript
      Type42 (the opposite of opentype, it's truetype embedded in postscript)
    
- 
      SVG 1.1 fonts
      
    
- 
      Macintosh font formats
    
- 
      Windows raster font formats
      
    
- 
      X11 pcf format
      
    
- 
      PC Screen
      Font (psf/psfu/psf2)
    
- 
      TeX font formats
      
    
- 
      SIL
      Graphite Fonts (smart font extension to TrueType. Additional tables
      containing rules for composing, reordering, spacing, etc. glyphs)
    
- 
      Palm pilot fonts (pdb files)
      
    
- 
      OpenDoc.
      Sadly Proprietary so I shan't support it.
    
- 
      Acorn
      RISC OS font format (these fonts are often zipped up with a non-standard
      zip).
    
- 
      Ikarus IK format is documented in Peter Karow's book Digital Formats for
      Typefaces, Appendices G&I. (copies may still be available from
      URW++)
 Interestingly the exact format of a curve is up to the interpretation program.
- 
      sfd files (FontForge's internal spline font
      database format)
    
- 
      cidmap files (Fontforge's format for mapping
      cids to unicode)
    
- 
      XML formats
      
	- 
	  TTX -- TrueType XML
	
- 
	  UFO &
	  GLIF
	  -- Unified font objects & Glyph Interchange Format
      
 
  Other font links
  
  
  
  
  
  
    
  
  
  
  
  
    Font editor concepts
  
  
  Karow, Peter, 1994, Font Technology, Description and Tools
  
  Karow, Peter, 1987, Digital Formats for Typefaces
  
  
  Hoenig, Alan TeX Unbound: LaTeX and TeX Strategies for Fonts, Graphics
  & More
  
  Knuth, Donald, 1979, TeX and METAFONT, New Directions in Typesetting
  
    Interview
  
  
  I was interviewed by the Open Source Publishing people at
  LGM2. There's an
  mp3 file of the interview
  available on their site.
  
  
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