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|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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content="text/javascript">
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content="ttfautohint: a free auto-hinter for TrueType fonts">
<meta name="keywords"
content="FreeType TrueType digital font TTF engine autohint hint">
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href="../image/favicon_60.ico">
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class="bar">
<h1><a href="index.html">ttfautohint</a></h1>
</div>
<div id="wrapper">
<div class="colmask leftmenu">
<div class="colright">
<div class="col1wrap">
<div class="col1">
<!-- ************************************************** -->
<div id="goal">
<p>ttfautohint provides a 99% automated hinting process and
a platform for finely hand-hinting the last 1%. It is
ideal for web fonts and supports many scripts: Latin,
Greek, Arabic, Devanagari, Hebrew, Khmer, Myanmar, Thai,
and many more.</p>
</div>
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align="center">
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value="true">
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<div id="news">
<h4>1st January 2018</h4>
<p>The new year starts with a new ttfautohint release,
version 1.8.1! (Version 1.8 was not released due to a
serious configuration bug found after publicly tagging the
git repository.) Its main new feature is a third stem
width and positioning mode, ‘natural’: No
adjustments to stem widths, discrete blue zone
positioning. This is what FreeType uses for its
‘light’ (auto-)hinting mode.</p>
<p>Another important improvement is the possibility to
manually override stem widths for the hinting process.
This is especially useful for extra-bold fonts, where the
algorithmically derived values are often too large,
causing the filling of ‘eyes’ in glyphs like
‘e’ or ‘a’ at small sizes.</p>
<p>Finally, ttfautohint gets now installed as a library also
(if you use the Unix toolchain for building and
installation).</p>
<p>The complete list of changes can be found in
the <a href="http://sourceforge.net/projects/freetype/files/ttfautohint/1.8.1/">release
notes</a>.</p>
<h4>26th August 2017</h4>
<p>This release mainly brings support for a bunch of new
scripts: Adlam, Avestan, Bamum, Buhid, Unified Canadian
Syllabics, Carian, Chakma, Coptic, Cypriot, Deseret,
Glagolitic, Gothic, Kayah Li, Lisu, N'Ko, Ol Chiki, Old
Turkic, Osage, Osmanya, Saurashtra, Shavian, Sundanese,
Tai Viet, Tifinagh, Vai – many thanks to Sascha Brawer who
contributed most of the code!</p>
<p>Other, minor changes are described in
the <a href="http://sourceforge.net/projects/freetype/files/ttfautohint/1.7/">release
notes</a>.</p>
<h4>27th November 2016</h4>
<p>The long overdue version 1.6 is finally out! Its main
new feature is the support of a reference file from which
all blue zone values are taken. Besides that, a large
bunch of new scripts has been added: Armenian, Cherokee,
Ethiopic, Georgian, Gujarati, Gurmukhi, Kannada,
Malayalam, Sinhala, and Tamil.</p>
<p>A more detailed list of changes can be found in
the <a href="http://sourceforge.net/projects/freetype/files/ttfautohint/1.6/">release
notes</a>.</p>
<div style="text-align: center;
margin-top: 2ex">
<a title="ttfautohint 1.6 on Windows 8.1">
<img src="image/ttfautohint-1.6-win81.png"
alt="A screen snapshot of the ttfautohint binary
version 1.6 on Windows 8.1"
width="670"
height="650">
</a>
</div>
<h4>24th January 2016</h4>
<p>I've just released version 1.5, which mainly brings
support for some new scripts: Khmer, Mynamar, and Bengali
(and more Indic scripts to come in the next release).
Information on other changes and bugfixes can be found in
the <a href="http://sourceforge.net/projects/freetype/files/ttfautohint/1.5/">release
notes</a>.</p>
<h4>18th October 2015</h4>
<p>Due to a serious bug in applying control instructions to
accent-like glyphs, it was necessary to release version
1.4.1 (containing no other noteworthy changes). All users
should upgrade.
<h4>5th October 2015</h4>
<p>Version 1.4 is out! It now supports hinting for fonts
providing glyphs for Lao, Thai, and Arabic, among other
things. It also fixes an annoying buglet for the
‘touch’ keyword as used in control
instructions files.</p>
<p>As usual, you can find more information in
the <a href="http://sourceforge.net/projects/freetype/files/ttfautohint/1.4/">release
notes</a>.</p>
<h4>7th January 2015</h4>
<p>I've released version 1.3. Besides support for Telugu,
there is a new facility for testing parameters of
ttfautohint in parallel.</p>
<p>Please read
the <a href="http://sourceforge.net/projects/freetype/files/ttfautohint/1.3/">release
notes</a> for more.</p>
<h4>7th October 2014</h4>
<p>Since yesterday, version 1.2 is available for download.
The most important change is a new possibility to
fine-tune the hinting process at a low level.</p>
<p>Other improvements are covered
<a href="http://sourceforge.net/projects/freetype/files/ttfautohint/1.2/">here</a>
as usual.</p>
<h4>7th May 2014</h4>
<p>Version 1.1 is now available. The main new feature is
support for the Devanagari script – please test!</p>
<p>In case you need hinting for GDI ClearType, you should
upgrade to this version, since some bugs related to stem
width computation were identified and fixed. As usual,
the complete list of important changes can be
found <a href="http://sourceforge.net/projects/freetype/files/ttfautohint/1.1/">here</a>.</p>
<h4>27th March 2014</h4>
<p>The Windows binary of ttfautohintGUI version 1.00 didn't
work standalone, as intended. Please download it again
(the new <tt>.7z</tt> archive has 26-Mar-2014 as the date
and a size of 3278316 bytes).</p>
<h3>Version 1.0 has been released</h3>
<div class="date">22nd March 2014</div>
<p>Finally, the long-awaited version 1.0 is here! Compared
to the 1.00rc1 release, the memory management has been
improved to avoid excessive allocation under certain
circumstances. Support for symbol fonts has been fixed
also.</p>
<p>As mentioned earlier, GDI ClearType hinting is now much
better. However, I missed to show comparison images,
which I now do. The top and bottom images (showing Ubuntu
regular processed with ttfautohint) are the output of an
older and the current version of ttfautohint,
respectively.</p>
<div style="text-align: center;
margin-top: 1ex;
margin-bottom: 1ex;">
<img src="image/ttfa-gdi-old-C.png"
alt="A magnified screen snapshot of GDI hinting
created with an older version of ttfautohint"
width="92"
height="112"
style="padding-right: 1em">
<img src="image/ttfa-gdi-new-C.png"
alt="A magnified screen snapshot of GDI hinting
created with version 1.0 of ttfautohint"
width="92"
height="112"
style="padding-left: 1em">
</div>
<p>The ugly flat tops and bottoms of round shapes are
gone.</p>
<h4><a href="history.html">older news</a></h4>
</div>
<!-- ************************************************** -->
<div id="introduction">
<h2>Introduction</h2>
<p><a href="mailto:wl@gnu.org">Werner Lemberg</a> is making
it easy for type designers to create web fonts that look
great on Windows, with <tt>ttfautohint</tt>.</p>
<p>Hinting TrueType fonts can be a slow and expensive
process, and many fonts lack good hinting totally because
they are converted to TrueType from another font
format.</p>
<p><tt>ttfautohint</tt> solves this, by building on
<a href="http://www.freetype.org">FreeType</a>'s
auto-hinting system. It brings the excellent quality of
FreeType rendering to platforms which don't use FreeType,
yet require hinting for text to look good – like
Microsoft Windows.</p>
<p>Across Windows rendering environments today,
<tt>ttfautohint</tt> fonts look best with DirectWrite
ClearType enabled. This is the default for Windows 7
and newer. Good visual results are also seen in recent
MacOS X versions and GNU/Linux systems that do use
FreeType for rendering.</p>
<p>The main part of the project is a code
library, <tt>libttfautohint</tt>, which is described in
detail in the source code header file
<a href="http://repo.or.cz/w/ttfautohint.git/blob/HEAD:/lib/ttfautohint.h"><tt>src/ttfautohint.h</tt></a>.
There are utility programs with both command-line and GUI
interfaces, <a href="#download">ready to use
today</a>.</p>
<p>The goal of the project is to generate a ‘first
pass’ of hinting that font developers can refine
further for ultimate quality.</p>
<div style="text-align: center;
margin-top: 2ex">
<img src="image/LiberationSerif-Regular-TA-dollar-19px.gif"
alt="animated dollar glyph of LiberationSerif-Regular"
width="407"
height="444">
</div>
<p>The animation above shows how the hints created
by <tt>ttfautohint</tt> get applied to the dollar glyph of
<a href="https://fedorahosted.org/liberation-fonts/">Liberation
Serif Regular</a> at 19 pixels per em, using
<a href="http://fontforge.sourceforge.net/">FontForge</a>'s
TrueType hinting bytecode debugger. (You can view the
image <a href="image/LiberationSerif-Regular-TA-dollar-19px.gif">directly</a>
to see it in original size.)</p>
</div>
<!-- ************************************************** -->
<div id="roadmap">
<h2>Roadmap</h2>
<p>The project started in 2010
when <a href="http://understandingfonts.com/">Dave
Crossland</a> suggested the idea of the program. Werner was
able to start development thanks to financial support from the
<a href="http://www.google.com/webfonts/">Google Web
Fonts</a> team.</p>
<p>He soon produced results that received
<a href="http://typophile.com/node/83829">some warm
attention from professional type designers</a>.</p>
<p>Hinting TrueType fonts is a very time consuming and
expensive process for type designers. Producing high
quality hinting for most glyphs in a font, and allowing
them to fine-tune the results by hand will simplify the
lives of all type designers. This little program is set
to improve the quality of web typography!</p>
<p>The <a href="http://repo.or.cz/w/ttfautohint.git/blob/HEAD:/TODO"><tt>TODO</tt></a>
file in the source code repository provides an extensive
list of things which will be eventually handled in one or
another way. Here is a short list of essential items:</p>
<ul style="list-style: circle">
<li>
<p><strong>Improve the way you can fine-tune the
results</strong> – you can already control
blue zones and stem widths together with delta
instructions and other details of the hinting
process, but there are certainly aspects that could
be improved further. If you have feedback for this
feature, please send an e-mail
to <a href="mailto:wl@gnu.org">Werner
Lemberg</a>.</p>
</li>
<li>
<p><strong>Add hooks for other tools</strong> – to
allow smooth integration with various font editors.
Some of them already support a direct call of
ttfautohint, but more has to be done, especially for
fine-tuning blue-zones and the like.</p>
</li>
<li>
<p><strong>Emit the actions in the high-level hinting
command languages</strong> – those used in other
tools, such as
<a href="http://www.microsoft.com/typography/tools/vtt.aspx">Visual
TrueType (VTT)</a> or
<a href="http://www.fontlab.com/">FontLab</a>, instead
of only emitting final low-level bytecode. This will
allow designers to fine tune the results by hand
– essential for those tricky glyphs that require
intelligent decisions by a human</p>
</li>
</ul>
</div>
<!-- ************************************************** -->
<div id="samples">
<h2>Visual Samples</h2>
<p>The late <a href="http://sansoxygen.com">Vernon Adams</a>
helped in providing comparison images, testing the output
of various browsers on different platforms. For this
purpose, he used his
excellent <a href="http://vernnobile.github.io/webfont-testing/">framework
for testing browser fonts</a>. Some of them are shown
below.</p>
<p class="warning">You should look at the images without any
zoom so that your browser doesn't rescale them.</p>
<p>Ubuntu Regular, Windows DirectWrite ClearType (as
rendered by Firefox on Windows 7). Left the
original, manual hinting, right the hinting applied by
<tt>ttfautohint</tt>:</p>
<div style="text-align: center;
margin-top: 1ex;
margin-bottom: 1ex;">
<img src="image/ubuntu-original-firefox-win7.png"
alt="Ubuntu Regular, Windows DirectWrite ClearType,
original hinting"
width="360"
height="910">
<img src="image/ubuntu-ttfa-firefox-win7.png"
alt="Ubuntu Regular, Windows DirectWrite ClearType,
ttfautohint hinting"
width="360"
height="910">
</div>
<p>Ubuntu regular, GDI ClearType (as rendered by Chrome on
Windows 7). Left the original, manual hinting, right
the hinting applied by <tt>ttfautohint</tt>:</p>
<div style="text-align: center;
margin-top: 1ex;
margin-bottom: 1ex;">
<img src="image/ubuntu-original-chrome-win7.png"
alt="Ubuntu Regular, Windows GDI ClearType,
original hinting"
width="360"
height="954">
<img src="image/ubuntu-ttfa-chrome-win7.png"
alt="Ubuntu Regular, Windows GDI ClearType,
ttfautohint hinting"
width="360"
height="954">
</div>
<p>Bitstream Vera Sans, Windows DirectWrite ClearType (as
rendered by Firefox on Windows 7). Left the
original, manual hinting, right the hinting applied by
<tt>ttfautohint</tt>:</p>
<div style="text-align: center;
margin-top: 1ex;
margin-bottom: 1ex;">
<img src="image/vera-original-firefox-win7.png"
alt="Bitstream Vera Sans, Windows DirectWrite
ClearType, original hinting"
width="360"
height="910">
<img src="image/vera-ttfa-firefox-win7.png"
alt="Bitstream Vera Sans, Windows DirectWrite
ClearType, ttfautohint hinting"
width="360"
height="910">
</div>
<p>Bitstream Vera Sans, GDI ClearType (as rendered by Chrome
on Windows 7). Left the original, manual hinting,
right the hinting applied by <tt>ttfautohint</tt>:</p>
<div style="text-align: center;
margin-top: 1ex;
margin-bottom: 1ex;">
<img src="image/vera-original-chrome-win7.png"
alt="Bitstream Vera Sans, Windows GDI ClearType,
original hinting"
width="360"
height="954">
<img src="image/vera-ttfa-chrome-win7.png"
alt="Bitstream Vera Sans, Windows GDI ClearType,
ttfautohint hinting"
width="360"
height="954">
</div>
<p>DroidSerif Regular, Windows DirectWrite ClearType (as
rendered by Firefox on Windows 7). Left the
original, manual hinting, right the hinting applied by
<tt>ttfautohint</tt>:</p>
<div style="text-align: center;
margin-top: 1ex;
margin-bottom: 1ex;">
<img src="image/droidserif-original-firefox-win7.png"
alt="DroidSerif Regular, Windows DirectWrite
ClearType, original hinting"
width="360"
height="910">
<img src="image/droidserif-ttfa-firefox-win7.png"
alt="DroidSerif Regular, Windows DirectWrite
ClearType, ttfautohint hinting"
width="360"
height="910">
</div>
<p>DroidSerif Regular, GDI ClearType (as rendered by Chrome
on Windows 7). Left the original, manual hinting,
right the hinting applied by <tt>ttfautohint</tt>:</p>
<div style="text-align: center;
margin-top: 1ex;
margin-bottom: 1ex;">
<img src="image/droidserif-original-chrome-win7.png"
alt="DroidSerif Regular, Windows GDI ClearType,
original hinting"
width="360"
height="954">
<img src="image/droidserif-ttfa-chrome-win7.png"
alt="DroidSerif Regular, Windows GDI ClearType,
ttfautohint hinting"
width="360"
height="954">
</div>
<p>Finally, here the font files used in the samples above so
that you can compare the hinting results by yourself.</p>
<div class="quote">
<p><a href="Ubuntu-R.ttf"><tt>Ubuntu-R.ttf</tt></a>
(<a href="http://font.ubuntu.com/">Ubuntu Regular</a>,
version 0.80)<br>
<a href="Ubuntu-TTFautohint-R.ttf"><tt>Ubuntu-TTFautohint-R.ttf</tt></a></p>
<p><a href="DroidSerif-Regular.ttf"><tt>DroidSerif-Regular.ttf</tt></a>
(<a href="http://www.google.com/fonts/specimen/Droid+Serif#pairings">DroidSerif
Regular</a>, version 1.00)<br>
<a href="DroidSerif-TTFautohint-Regular.ttf"><tt>DroidSerif-TTFautohint-Regular.ttf</tt></a></p>
<p><a href="Vera.ttf"><tt>Vera.ttf</tt></a>
(<a href="http://ftp.gnome.org/pub/GNOME/sources/ttf-bitstream-vera/1.10/">Bitstream
Vera Sans</a>, version 1.10)<br>
<a href="Vera-TTFautohint.ttf"><tt>Vera-TTFautohint.ttf</tt></a></p>
</div>
<p>Note that the fonts were generated with
version 1.00rc1 of <tt>ttfautohint</tt> (using
default settings); they were also manually edited
with <a href="http://sourceforge.net/projects/fonttools/">ttx</a>
to change the font names so that it is possible to use the
original versions and the versions processed
with <tt>ttfautohint</tt> in parallel.</p>
<p>Recently, Jasper de Waard completed
his <a href="https://fonts.google.com/specimen/Proza+Libre">Proza
Libre</a> font family, using ttfautohint for hinting,
which he documented both in a
<a href="http://ilovetypography.com/2016/07/14/making-fonts-proza-libre/">blog</a>
and a video.</p>
<div style="text-align: center;
margin-top: 1ex;
margin-bottom: 1ex;">
<iframe src="https://player.vimeo.com/video/140530738"
width="640"
height="360"
frameborder="0"
webkitallowfullscreen
mozallowfullscreen
allowfullscreen></iframe>
</div>
<p>Matt Wiebe has tested the
font <a href="http://en.wikipedia.org/wiki/VAG_Rounded"><em>VAG
Rounded</em></a> with a very early version
of <tt>ttfautohint</tt>; he presents the results on
his <a href="http://somadesign.ca/2011/improve-windows-type-rendering-with-ttfautohint/">blog</a>.</p>
</div>
<!-- ************************************************** -->
<div id="works">
<h2 class="section">How It Works</h2>
<p>A detailed description of the auto-hinter inside FreeType
can be found
<a href="../autohinting/hinter.html">here</a>. Although
these web pages are in need of an update, the basic
principles of the auto-hinting process haven't changed.
There is one exception: The auto-hinter no longer tries to
provide good hinting for monochrome rasterization.
Instead, it expects anti-aliasing with 256 gray levels,
which became standard with Windows 98.</p>
<p>A scholarly paper published in the EuroTeX 2003 proceedings,
titled
<a href="http://www.tug.org/TUGboat/tb24-3/lemberg.pdf"><em>Real-Time
Grid Fitting of Typographic Outlines</em></a>, gives
further insight into the auto-hinting system's inner
workings.</p>
<p>In the above links, one aspect of the auto-hinting
process is missing: The various steps performed by the
auto-hinter (called <em>actions</em>) can be described as
high-level operations, for example “aligning a given
edge to a given blue zone,” or “linking this
edge to another one within a given distance.”
The <tt>ttfautohint</tt> library hooks into these actions
and transforms them into bytecode routines.</p>
<p>Similar to most TrueType hints, the autohint actions
depend on the device resolution.
Consequently, <tt>ttfautohint</tt> walks over a large
range of ppem values (8 to 50 ppem by default)
and collects the actions as sets. A typical glyph outline
needs three to four sets (covering the whole range), but
sometimes more than ten are necessary.</p>
<p>Intentionally, <tt>ttfautohint</tt> adds hints only along
the y-axis.
The <a href="http://www.antigrain.com/research/font_rasterization/">Anti-Grain
research</a> describes some of the reasons behind this
decision. While the article is quite old, the mentioned
ideas are still valid.</p>
<p>The <tt>ttfautohint</tt> library contains a copy of
FreeType's ‘autofit’ module, reformatted and
using a different function prefix, and with slight
extensions for hooks into hinting actions. It therefore
inherits the same dual-licensing as FreeType; you can
choose between the GNU Public License (GPL) Version 2
and the FreeType License (FTL).</p>
</div>
<!-- ************************************************** -->
<div id="contact">
<h2>Contact</h2>
<p>Werner Lemberg
(<a href="mailto:wl@gnu.org">wl@gnu.org</a>) is Technical
Lead, and does all the programming. He is a professional
classical musician and lives in Vienna, Austria.</p>
<p>Dave Crossland
(<a href="mailto:dave@understandingfonts.com">dave@understandingfonts.com</a>)
is the Project Manager, and wrote and art directed the
promotional video at the top of this page. He is a
professional type designer and lives in London,
England.</p>
<p>Andy Ellis
(<a href="mailto:hello@fadeinfadeout.co.uk">hello@fadeinfadeout.co.uk</a>)
designed and produced the promotion video. He is a
professional motion graphic designer and lives in London,
England.</p>
</div>
<!-- ************************************************** -->
<div id="download">
<h2>Download</h2>
<p>Current version: 1.8.1 (1st January 2018)</p>
<h3>Binaries</h3>
<p>These stand-alone versions of ttfautohint and
ttfautohintGUI don't have any dependencies and can be run
directly after uncompressing the archive.</p>
<p><strong>
<a href="http://sourceforge.net/projects/freetype/files/ttfautohint/1.8.1/ttfautohint-1.8.1-win32.7z/download">Windows</a>
</strong><br>
<tt>ttfautohint 1.8.1</tt> – both command line and
GUI.</p>
<p><strong>
<a href="http://sourceforge.net/projects/freetype/files/ttfautohint/1.8.1/ttfautohint-1.8.1-tty-osx.tar.gz/download">Apple</a>
</strong><br>
<tt>ttfautohint 1.8</tt> – currently command line
only; thanks to Karsten Lücke for creating this!
This universal binary (functionally equivalent to version
1.8.1) for the i386 and x86_64 architectures has been
compiled under OS X 10.5.8 and should run with newer
versions also. Read <a href="osx.html">this page</a> how
to get the GUI version.</p>
<h3>Source Code and Documentation</h3>
<p>The latest source package of <tt>ttfautohint</tt>,
including documentation in HTML, PDF, and text format, can
be downloaded either
from <a href="http://download.savannah.gnu.org/releases/freetype/">Savannah</a>
or
from <a href="http://sourceforge.net/projects/freetype/files/ttfautohint/">SourceForge</a>.</p>
<p>The documentation is available
<a href="doc/ttfautohint.html">online</a> also.
<p>All development takes places within a public git repository;
see the
<a href="http://repo.or.cz/w/ttfautohint.git">repo.or.cz</a>
repository homepage for details.</p>
<p>Note: Prerequisites for compiling the library is FreeType
version 2.4.5 or newer and HarfBuzz version 1.3.0 or
newer; see <a href="../download.html">FreeType's download
page</a>
and <a href="http://www.freedesktop.org/software/harfbuzz/release/">HarfBuzz's
download page</a> for more information.</p>
<p><a href="osx.html">Compile
<tt>ttfautohint</tt> for Mac OS X</a>, including the
GUI.</p>
</div>
<!-- ************************************************** -->
<div class="webmaintainer">
<p>This page is maintained by
<a href="mailto:wl@gnu.org">Werner Lemberg.</a></p>
</div>
</div>
</div>
<!-- ************************************************** -->
<div class="col2">
</div>
</div>
</div>
<!-- ************************************************** -->
<div id="TOC">
<ul>
<li class="primary">
<a href="index.html" class="current">Home</a>
</li>
<li class="primary">
<a href="#goal">Goal</a>
</li>
<li class="primary">
<a href="#video">Watch The Video</a>
</li>
<li class="primary">
<a href="#news">News</a>
</li>
<li class="primary">
<a href="#introduction">Introduction</a>
</li>
<li class="primary">
<a href="doc/ttfautohint.html">Documentation</a>
</li>
<li class="primary">
<a href="#roadmap">Roadmap</a>
</li>
<li class="primary">
<a href="#samples">Visual Samples</a>
</li>
<li class="primary">
<a href="#works">How It Works</a>
</li>
<li class="primary">
<a href="#contact"
class="emphasis">Contact</a>
</li>
<li>
<a href="#download">Download</a>
</li>
</ul>
</div>
</div> <!-- id="wrapper" -->
<div id="TOC-bottom">
</div>
</body>
</html>
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