User Guide

FontLab 4
630
Features and Lookups
Every feature consists of one or more lookups. A Lookup is an elementary
procedure performed on a glyph sequence or positioning data. For
instance, “replace the sequence of ‘f’ and ‘l’ with the ‘fl’ ligature glyph” is a
lookup. A combination of similar lookups forms a feature.
The sequence of lookups is important. They are applied in the order they
are defined. The sequence of features is also important, but the application
or operating system may make changes in the feature preference.
By default all features and lookups are defined for the default language of
the Latin script.