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Examples of headline letter-spacing In typography, letter-spacing, usually called tracking by typographers, refers to a consistent degree of increase (or sometimes decrease) of space between letters to affect density in a line or block of text. Letter-spacing should not be confused with kerning. Letter-spacing refers to a uniform adjustment to the spacing of a word or block of text affecting its density and texture. Kerning is a spacing adjustment of one or more ''specific pairs'' of adjacent characters that, because of the relationship of their respective shapes, would appear to be badly spaced if spaced normally. A classic example is a capital V next to a capital A, which need to be brought closer together. In its original meaning with metal type, a kern meant having a letter stick out beyond the metal slug it was attached to, or cutting off part of the body of the slug to allow (other similarly-trimmed) letters to overlap. So a kern in that sense could only bring letters closer together (negative spacing), though of course it was possible to add space between letters. Digital kerning can go in either direction. Tracking can similarly go in either direction, though with metal type one could only adjust groups of letters further apart (positive spacing). Letter-spacing adjustments are frequently used in news design. The speed with which pages must be built on deadline does not usually leave time to rewrite paragraphs that end in split words or that create orphans or widows. Letter-spacing is increased or decreased by modest (usually unnoticeable) amounts to fix these unattractive situations. ==Digital systems== Word processing and desktop publishing programs for personal computers such as—Microsoft Word, WordPerfect, QuarkXPress, Adobe InDesign, Adobe FrameMaker, Adobe Illustrator, and Adobe Photoshop—use differing methods of adjusting letter-spacing. What is common to most systems is that the default letter-spacing is zero, using the character widths and kerning information built into the font itself. Although digital type sets tighter on average than metal type, this results primarily from the more ready availability of kerning, rather than any design choice inherent in the technology. However, digital type does allow for negative sidebearings, which were uncommon in metal type due to the difficulty in cutting a "kern" in the original sense. In the days of machine-implemented lead typesetting, such as Linotype machines and the Monotype System, letter-spacing had to be uniform. In modern digital page-layout software, high-end applications all use relative measurements proportional to the size of the type. QuarkXPress uses units of 1/200 of an em, and the competing Adobe InDesign uses 1/1000 of an em. Thus, in QuarkXPress a tracking setting of 3 opens text noticeably, while in InDesign a tracking setting of 3 is barely noticeable. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Letter-spacing」の詳細全文を読む スポンサード リンク
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