![]() ![]() AAT In AAT, the required ligatures that do not get letterſpacing have the Setting Required Ligatures and the Settingcode 0, while the other ligatures that do get letterſpacing have the Setting Common Ligatures and the Settingcode 2. That is why it is deſirable to compoſe them into a ſingle glyph before further glyph proceſſing adds letterſpacing. The required ligatures behave like ſingle glyphs with regard to letterſpacing. The ſpecification of the feature ccmp does not explicitly mention fraktur typography, but it perfectly matches its requirements: „t may be preferable to compose two characters into a ſingle glyph for better glyph proceſſing“ (ſee ccmp in the OpenType Layout tag registry). Both features ought to be activated by default in all ſcripts (ſee Features: Standard OpenType ſpecification). The different ſmart font technologies provides different means for doing ſo: OpenType In OpenType, the required ligatures that do not get letterſpacing have to be defined in the feature ccmp („Glyph Compoſition/Decompoſition“), while the other ligatures that do get letterſpacing have to be defined in the feature liga (“Standard Ligatures”). This means that a fraktur font needs a way of diſtinguishing between two types of ligatures, the required ligatures that do not get letterſpacing and the other ligatures that do get letterſpacing. Theſe other ligatures get letterſpacing juſt like normal ſequences of letters. ![]() However, moſt fraktur fonts will uſe other ligatures as well, for inſtance ligatures for ‹ſi› or ‹fl›. There are four ligatures that do not get letterſpacing: ‹ch›, ‹ck›, ‹ſt›, ‹tz›. Fraktur letterſpacing and ſmart font technologies This text ſhould really look exactly like the above image (except for differences in font raſterization), ſince the image is a ſcreenſhot of that very text. If you want to know whether your browſer is, compare the following text: This image is really a ſcreenſhot from Firefox 16.0.1 on Mac OS X 3.5.8 – ſince the releaſe of Firefox 4.0, all Firefox builds are capable of correct fraktur letterſpacing. ![]()
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