Font Typesetting Function 02: “GPOS and GSUB”

The OpenType features have a function to “make adjustment by moving the glyph position” and another function to “replace the glyph.” The former is called GPOS and the latter is called GSUB. GPOS is an abbreviation for Glyph Positioning, and pronounced as “Gee Pos.” GSUB is an abbreviation for Glyph Substitution, and pronounced as “Gee Sub.”

The figure indicates the GPOS/GSUB features implemented in general StdN fonts. In the case of Japanese fonts, the GPOS feature is mainly used for typesetting with narrowed spacing between characters. Apart from being used for vertical typesetting, the GSUB feature can be used in enjoyable ways, such as selecting the character shape the user likes, etc.



Series archive Typesetting Japanese / Font Typesetting Function