<P> Colors are important for emphasizing . Important words in a text may be colored differently from others . For example, many dictionaries use a different color for headwords, and some religious texts color the words of deities red, commonly referred to as rubric . In Ethiopic script, red is used analogously to italics in Latin text . </P> <P> Post-print emphasis added by a reader is often done with highlighters which add a bright background color to usual black text . </P> <P> There are many designs . With both italics and boldface, the emphasis is correctly achieved by swapping into a different font of the same family; for example by replacing body text in Arial with its bold or italic style . Professional typographic systems, including most modern computers, would therefore not simply tilt letters to the right to achieve italics (that is instead referred to as slanting or oblique), print them twice or darker for boldface, or scale majuscules to the height of middle - chamber minuscules (like x and o) for small - caps, but instead use entirely different typefaces that achieve the effect . The letter' w', for example, looks quite different in italic compared to upright . </P> <P> As a result, typefaces therefore have to be supplied at least fourfold (with computer systems, usually as four font files): as regular, bold, italic, and bold italic to provide for all combinations . Professional typefaces sometimes offer even more variations for popular fonts, with varying degrees of blackness . Only if such fonts are not available should the effect of italic or boldface be imitated by algorithmically altering the original font . </P>

When is it most appropriate to use italics in a printed document