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authorKarl Berry <karl@freefriends.org>2009-05-22 23:51:44 +0000
committerKarl Berry <karl@freefriends.org>2009-05-22 23:51:44 +0000
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+<head>
+<title>UK TeX FAQ -- question label ECfonts</title>
+</head><body>
+<h3>What are the EC fonts?</h3>
+<p/>A font consists of a number of <em>glyphs</em>. In order that the
+glyphs may be printed, they are <a href="FAQ-whatenc.html"><em>encoded</em></a>, and
+the encoding is used as an index into tables within the font. For
+various reasons, Knuth chose deeply eccentric encodings for his
+Computer Modern family of fonts; in particular, he chose different
+encodings for different fonts, so that the application using the fonts
+has to remember which font of the family it&rsquo;s using before selecting a
+particular glyph.
+<p/>When TeX version 3 arrived, most of the excuses for the
+eccentricity of Knuth&rsquo;s encodings went away, and at TUG&rsquo;s Cork
+meeting, an encoding for a set of 256 glyphs, for use in TeX text,
+was defined. The intention was that these glyphs should cover &lsquo;most&rsquo;
+European languages that use Latin alphabets, in the sense of including
+all accented letters needed. (Knuth&rsquo;s CMR fonts missed things
+necessary for Icelandic and Polish, for example, but the Cork
+fonts have them. Even Cork&rsquo;s coverage isn&rsquo;t complete: it misses
+letters from Romanian, Eastern and Northern Sami, and Welsh, at
+least. The Cork encoding does contain &ldquo;NG&rdquo; glyphs that
+allows it to support Southern Sami.) LaTeX refers to the
+Cork encoding as T1, and
+provides the means to use fonts thus encoded to avoid problems with
+the interaction of accents and hyphenation
+(see <a href="FAQ-hyphenaccents.html">hyphenation of accented words</a>).
+<p/>The only Metafont-fonts that conform to the Cork encoding are the
+EC fonts. They look CM-like, though their metrics
+differ from CM-font metrics in several areas. The fonts are
+now regarded as &lsquo;stable&rsquo; (in the same sense that the CM fonts
+are stable: their metrics are unlikely ever to change). Their serious
+disadvantages for the casual user are their size (each EC font
+is roughly twice the size of the corresponding CM font), and
+there are far more of them than there are CM fonts. The simple
+number of fonts has acted as a disincentive to the production of Adobe
+Type 1 versions of the fonts, but several commercial suppliers offer
+EC or
+EC-equivalent fonts in type 1 or TrueType form &mdash; see
+
+<a href="FAQ-commercial.html">commercial suppliers</a>. Free
+<a href="FAQ-textrace.html">auto-traced versions</a> (the CM-super
+and the LGC fonts), and the Latin Modern series (rather
+directly generated from Metafont sources), are available.
+<p/>
+
+
+Note that the Cork encoding doesn&rsquo;t cover mathematics (and neither do
+&ldquo;T1-encoded&rdquo; font families, of course). If you&rsquo;re using
+Computer-Modern-alike fonts, this doesn&rsquo;t actually matter: your system
+will have the original Computer Modern fonts, which cover &lsquo;basic&rsquo;
+TeX mathematics; more advanced mathematics are likely to need
+separate fonts anyway. Suitable mathematics fonts for use with other
+font families are discussed in
+&ldquo;<a href="FAQ-psfchoice.html">choice of scalable fonts</a>&rdquo;.
+<p/>The EC fonts are distributed with a
+set of &lsquo;Text Companion&rsquo; (TC) fonts that provide glyphs for
+symbols commonly used in text. The TC fonts are encoded
+according to the LaTeX TS1 encoding, and are not viewed as
+&lsquo;stable&rsquo; in the same way as are the EC fonts are.
+<p/>The Cork encoding is also implemented by virtual fonts provided in the
+<a href="FAQ-usepsfont.html">PSNFSS system</a>,
+for Adobe Type 1 fonts, and also by the <i>txfonts</i> and
+<i>pxfonts</i> font packages
+
+(see <a href="FAQ-psfchoice.html">&ldquo;choice of scalable fonts&rdquo;</a>).
+<dl>
+<dt><tt><i>CM-super fonts</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/fonts/ps-type1/cm-super.zip">fonts/ps-type1/cm-super</a> (<a href="ftp://cam.ctan.org/tex-archive/fonts/ps-type1/cm-super.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/fonts/ps-type1/cm-super/">browse</a>)
+<dt><tt><i>CM-LGC fonts</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/fonts/ps-type1/cm-lgc.zip">fonts/ps-type1/cm-lgc</a> (<a href="ftp://cam.ctan.org/tex-archive/fonts/ps-type1/cm-lgc.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/fonts/ps-type1/cm-lgc/">browse</a>)
+<dt><tt><i>EC and TC fonts</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/fonts/ec.zip">fonts/ec</a> (<a href="ftp://cam.ctan.org/tex-archive/fonts/ec.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/fonts/ec/">browse</a>)
+<dt><tt><i>Latin Modern fonts</i></tt><dd><a href="ftp://cam.ctan.org/tex-archive/fonts/lm.zip">fonts/lm</a> (<a href="ftp://cam.ctan.org/tex-archive/fonts/lm.tar.gz">gzipped tar</a>, <a href="http://www.tex.ac.uk/tex-archive/fonts/lm/">browse</a>)
+</dl>
+<p/><p>This question on the Web: <a href="http://www.tex.ac.uk/cgi-bin/texfaq2html?label=ECfonts">http://www.tex.ac.uk/cgi-bin/texfaq2html?label=ECfonts</a>
+</body>