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Postscript
Type1
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PostScript Multiple Master
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CID
keyed fonts
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PostSript
Type2
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PostScript Type3
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PostScript Type14 (Chameleon)
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The PLRM (5.8.1) documents that this font format is undocumented.
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PostScript
Type42
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AFM
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PFM
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NTF
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This format is supposed to replace the pfm files above in windows >2000.
I can't find any docs on it.
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BDF
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True Type Standard
(Sadly different sources have slightly different definitions of less important
parts of the standard, be warned)
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Apple (I find Apple's prose
difficult, and sometimes misleading. I suggest using a different source when
possible)
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Microsoft
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random useful site
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TTC
-- True Type Font Collection
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Apple
Advanced Typography extensions to TrueType
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OpenType
(postscript embedded in a truetype wrapper, or advanced typography tables
in a truetype wrapper)
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Apple's
sfnt wrapper around a PS type1 font
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Postscript
Type42 (the opposite of opentype, it's truetype embedded in postscript)
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SVG 1.1 fonts
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Macintosh font formats
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Windows raster font formats
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X11 pcf format
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TeX font formats
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Palm pilot fonts (pdb? files)
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OpenDoc.
Sadly Proprietary so I shan't support it.
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Acorn
RISC OS font format (these fonts are often zipped up with a non-standard
zip).
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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.
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sfd files (PfaEdit's internal spline font database
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