KERNING HEADLINES

The difference between metric and optical kerning become more noticable when text is bigger. The most common problem is with captitals and lower case letters. H/a, T/a, T/o.

Kerning is an adjustment of the space between two letters. The characters of the Latin alphabet emerged over time; they were never designed with mechanical or automated spacing in mind. Thus some letter combinations look awkward without special spacing considerations. Gaps occur, for example, around letters whose forms angle outward or frame an open space (W, Y, V, T). In metal type, a kerned letter extends past the lead slug that supports it, allowing two letters to fit more closely together. In digital fonts, the space between letter pairs is controlled by a kerning table created by the type designer, which specifies spaces between problematic letter combinations. Working in a page layout program, a designer can choose to use metric kerning or optical kerning as well as adjusting the space between letters manually where desired. A well-designed typeface requires little or no additional kerning, especially at text sizes.

^{metric kerning} uses the kerning tables that are built into the typeface. When you select metric kerning in your page layout program, you are using the spacing that was intended by the type designer. Metric kerning usually looks good, especially at small sizes. Cheap novelty fonts often have little or no built-in kerning and will need to be optically kerned.

^{optical kerning} is executed automatically by the page layout program. Rather than using the pairs addressed in the font's kerning table, optical kerning assesses the shapes of all characters and adjusts the spacing wherever needed. Some graphic designers apply optical kerning to headlines and metric kerning to text. You can make this process efficient and consistent by setting kerning as part of your character styles.