CJKV Information Processing, 2nd Edition

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Chapter 7: Typography

Inter-glyph spacing according to character class

When the glyphs that correspond to characters of dierent character classes come

together in a run of text, there is spacing behavior. In other words, extra space, mea-

sured using a fraction of an em, is introduced depending on which two character

classes are in proximity.

*

Typical values are one-fourth and one-half of an em.

ere is much more to the JIS X 4051:2004 standard than what is described in this section,

and in this chapter for that matter. I strongly encourage you to acquire and explore the JIS

X 4051:2004 standard, along with applications that implement its functionality.

Multilingual Typography

Mixing together the glyphs that correspond to Latin and CJKV characters in a single

document, which can be referred to as multilingual text, requires that one take into con-

sideration many typographic issues, such as the Latin baseline, the spacing between Latin

and CJKV glyphs, and selection of appropriate typeface designs. Let us explore each of

these issues in the following sections.

Latin Baseline Adjustment

e glyphs for CJKV-specic characters, such as zhuyin, kana, hangul, and ideographs,

do not rest on a baseline as is the case for the glyphs for Latin characters. Instead, these

glyphs are optically or visually centered within the character cell.

†

Correct or consistent

use of a baseline