December 2008
Intermediate to advanced
912 pages
33h 22m
English
Content preview from CJKV Information Processing, 2nd Edition
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Alternate Metrics
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e application of spacing rulesTable 7-28.
Rule application Glyph string
No rules
With rules
No rules
With rules
In case it is not obvious, the glyph spacing that results from the application of spacing
rules looks much better than the glyph spacing without spacing rules. ese spacing rules
were formulated for good reason.
e JIS X 4051:2004 standard includes much more detailed information about such spac-
ing rules.
Proportional Symbols and Punctuation
Some of the same punctuation and symbols listed in the previous section (see Table 7-25)
can also be set with proportional widths—as opposed to xed half-width metrics. In fact,
there are some characters that must use proportional widths because their design is too
large for half-width metrics. A prime example is the full-width Latin characters that are
typical of all CJKV fonts.
Table 7-29 illustrates the word “Typography” set horizontally using the full-width Latin
glyphs of Morisawa’s A-OTF Pr6N L-KL (RyuminPr6N-Light) typeface de-
sign. When the same glyphs are set using proportional metrics, using the OpenType ‘palt’
(Proportional Alternate Widths) GPOS feature, the inter-glyph spacing is reduced. But,
the glyphs themselves are identical. It is also possible to substitute full-width glyphs with
those that were specically designed to be proportional, through the use of the ...
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