CJKV Information Processing, 2nd Edition

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Chapter 6: Font Formats, Glyph Sets, and Font Tools

or the ruby glyphs in a Japanese font, with those of standard Japanese fonts, there are two

important dierences to note, indicated as follows:

Small kana, such as • , , , , ,

󱛮

, , , , , and  for hiragana, are some-

times the same size as their standard-sized equivalents. is means that   and

 , specically the  versus , cannot be distinguished.

*

Small kana, when they are the same size as their standard-sized equivalents, do not •

need special vertical-use forms.

e Adobe-Japan1-4 character collection includes a complete set of ruby glyphs, and

OpenType fonts based on them are expected to use the ‘ruby’ GSUB feature to allow ap-

plications to access these glyphs. Adobe InDesign, for example, supports the ‘ruby’ GSUB

feature in the context of its ruby functionality. e Adobe-Japan1-5 character collec-

tion includes additional ruby glyphs that correspond to somewhat more obscure kana

characters.

Generic Versus Typeface-Specic Ruby Glyphs

Ruby glyphs can come in several varieties, depending on the typeface and the type found-

ry that designed them: generic, generic to a font family, and specic to a typeface:

Generic

Designed to be used with a variety of fonts and font families.

Generic to a particular font family

Intended for use with all weights of that font family—due to the small size at which ...