OpenType
OpenType is a cross-platform font format developed by Adobe and Microsoft in the late 1990s. It has the faculty to include an expanded character set and layout features to provide richer linguistic support and/or advanced typographic control such as various numeral styles, ligatures, small capitals and contextual substitutions. OpenType supports Unicode, which enables the fonts to contain more than 65,000 glyphs while ʻPostScript®ʼ fonts are technically limited to a maximum of only 256 characters. This means that a user does not need to have separate fonts for Western, Central European or other languages, but could have one single file which supports all these encodings. OpenType fonts, as a new industry standard, will work in all applications, however only some applications take profit of the advanced OpenType features, other applications will only use the first 256 characters.
OpenType Features
OFF
ON
picto All Caps [CPSP]
picto2 Case Sensitive Forms [CASE]

With both OpenType and other fonts, this function formats the text in uppercase. With OpenType fonts, it also applies ‘Case Sensitive Forms’ OpenType layout features for alternate uppercase positioning of punctuation, and spacing designed for all-cap use (not when text is typed in caps).
All Caps [CPSP]
 
picto Tabular Lining Figures [TNUM/LNUM]
picto2 Proportional Lining Fig. [PNUM/LNUM]]

Tabular figures are all of equal width. They are only needed when the figures must all line up from one line to the next, as in a table. Proportional figures have varying widths, just like most letters; each number has a width appropriate to its design. Lining figures are all the same height, usually similar to that of capital letters. They are needed for use with all-capital settings. Because some applications can’t have access to this feature, tabular figures is the default choice for Optimo fonts.
Tabular Lining Figures [TNUM/LNUM]
 
picto Standard Ligatures [LIGA]

Standard ligatures are glyphs which are designed to improve the kerning and readability of certain letter pairs. For example, when this feature is activated, typing ‘f’ and ‘i’ will automatically produce the ‘fi’ ligature.
Standard Ligatures [LIGA]
 
picto Discretionary Ligatures [DLIG]

This features activates discretionary ligatures. It will activate all other 
designed ligatures that are not classified as standard ligatures.
Discretionary Ligatures [DLIG]
 
picto Fractions [FRAC]

Turns on fractions. All OpenType fonts from Optimo have at least three basic pre-built fractions (1/2, 1/4, 3/4).
Fractions [FRAC]
 
picto Stylistic Alternates [SALT]
picto2 Stylistic Set 1 [SS01]

This feature will activate some alternative glyphs which can be activated by turning on ‘Stylistic Alternates’ in Adobe Illustrator and Photoshop, or on the other hand by selecting ‘Stylistic Set 1’ in InDesign.
Stylistic Alternates [SALT]
 
picto Contextual Alternates [CALT]

This feature substitutes a glyph or a combination of glyphs that only occur depending on what letters are nearby. For instance the letter ‘x’ placed after a number will be replaced by the ‘multiplication’ glyph. If the font has arrows, you will be able to display them by typing a combination of letter on your keyboard like ‘hyphen + greater-than’ or ‘hyphen + less-than.’ This feature is usually on by default in Adobe applications and QuarkXpress.
Contextual Alternates [CALT]