Typeface 3

[Jules Altier]

Theart and craft of designing typefaces is called type design. Designers of typefaces are called type designers and are often employed by type foundries. In desktop publishing, type designers are sometimes also called "font developers" or "font designers" (a typographer is someone who uses typefaces to design a page layout).

Every typeface is a collection of glyphs, each of which represents an individual letter, number, punctuation mark, or other symbol. The same glyph may be used for characters from different writing systems, e.g. Roman uppercase A looks the same as Cyrillic uppercase А and Greek uppercase alpha (Α). There are typefaces tailored for special applications, such as cartography, astrology or mathematics.

In professional typography,[a] the term typeface is not interchangeable with the word font (originally "fount" in British English, and pronounced "font"), because the term font has historically been defined as a given alphabet and its associated characters in a single size. For example, 8-point Caslon Italic was one font, and 10-point Caslon Italic was another. Historically, a font came from a type foundry as a set of "sorts", with number of copies of each character included.

As the range of typeface designs increased and requirements of publishers broadened over the centuries, fonts of specific weight (blackness or lightness) and stylistic variants (most commonly regular or roman as distinct to italic, as well as condensed) have led to font families, collections of closely related typeface designs that can include hundreds of styles. A font family is typically a group of related fonts which vary only in weight, orientation, width, etc., but not design. For example, Times is a font family, whereas Times Roman, Times Italic and Times Bold are individual fonts making up the Times family. Font families typically include several fonts, though some, such as Helvetica, may consist of dozens of fonts. In the loose terminology of desktop publishing, these distinctions are often lost and the term "font" used for an entire typeface rather than any one specific font within it.

Another way to look at the distinction between font and typeface is that a font is the vessel (e.g. the software) that allows you to use a set of characters with a given appearance, whereas a typeface is the actual design of such characters.[2] Therefore, a given typeface, such as Times, may be rendered by different fonts, such as computer font files created by this or that vendor, a set of metal type characters etc. In the metal type era, a font also meant a specific point size, but with digital scalable outline fonts this distinction is no longer valid, as a single font may be scaled to any size.

Font superfamilies began to emerge when foundries began to include typefaces with significant structural differences, but some design relationship, under the same general family name. Arguably the first superfamily was created when Morris Fuller Benton created Clearface Gothic for ATF in 1910, a sans serif companion to the existing (serifed) Clearface. The superfamily label does not include quite different designs given the same family name for what would seem to be purely marketing, rather than design, considerations: Caslon Antique, Futura Black and Futura Display are structurally unrelated to the Caslon and Futura families, respectively, and are generally not considered part of those families by typographers, despite their names.

Additional or supplemental glyphs intended to match a main typeface have been in use for centuries. In some formats they have been marketed as separate fonts. In the early 1990s, the Adobe Systems type group introduced the idea of expert set fonts, which had a standardized set of additional glyphs, including small caps, old style figures, and additional superior letters, fractions and ligatures not found in the main fonts for the typeface. Supplemental fonts have also included alternate letters such as swashes, dingbats, and alternate character sets, complementing the regular fonts under the same family.[4] However, with introduction of font formats such as OpenType, those supplemental glyphs were merged into the main fonts, relying on specific software capabilities to access the alternate glyphs.

Since Apple's and Microsoft's operating systems supported different character sets in the platform related fonts, some foundries used expert fonts in a different way. These fonts included the characters which were missing on either Macintosh or Windows computers, e.g. fractions, ligatures or some accented glyphs. The goal was to deliver the whole character set to the customer regardless of which operating system was used.

Type foundries have cast fonts in lead alloys from the 1450s until the present, although wood served as the material for some large fonts called wood type during the 19th century, particularly in the United States. In the 1890s, the mechanization of typesetting allowed automated casting of fonts on the fly as lines of type in the size and length needed. This was known as continuous casting, and remained profitable and widespread until its demise in the 1970s. The first machine of this type was the Linotype machine, invented by Ottmar Mergenthaler.[7]

Digital type became the dominant form of type in the late 1980s and early 1990s. Digital fonts store the image of each character either as a bitmap in a bitmap font, or by mathematical description of lines and curves in an outline font, also called a vector font. Bitmap fonts were more commonly used in the earlier stages of digital type, and are rarely used today. These bitmapped typefaces were first produced by Casady & Greene, Inc. and were also known as Fluent Fonts. Fluent Fonts became mostly obsolete with the creation of downloadable PostScript fonts, and these new fonts are called Fluent Laser Fonts (FLF).

When an outline font is used, a rasterizing routine (in the application software, operating system or printer) renders the character outlines, interpreting the vector instructions to decide which pixels should be black and which ones white. Rasterization is straightforward at high resolutions such as those used by laser printers and in high-end publishing systems. For computer screens, where each individual pixel can mean the difference between legible and illegible characters, some digital fonts use hinting algorithms to make readable bitmaps at small sizes.

Digital fonts may also contain data representing the metrics used for composition, including kerning pairs, component creation data for accented characters, glyph substitution rules for Arabic typography and for connecting script faces, and for simple everyday ligatures like "fl". Common font formats include TrueType, OpenType and PostScript Type 1, while Metafont is still used by TeX and its variants. Applications using these font formats, including the rasterizers, appear in Microsoft and Apple Computer operating systems, Adobe Systems products and those of several other companies. Digital fonts are created with font editors such as FontForge, RoboFont, Glyphs, Fontlab's TypeTool, FontLab Studio, Fontographer, or AsiaFont Studio.

Typographers have developed a comprehensive vocabulary for describing the many aspects of typefaces and typography. Some vocabulary applies only to a subset of all scripts. Serifs, for example, are a purely decorative characteristic of typefaces used for European scripts, whereas the glyphs used in Arabic or East Asian scripts have characteristics (such as stroke width) that may be similar in some respects but cannot reasonably be called serifs and may not be purely decorative.

Great variety exists among both serif and sans serif typefaces. Both groups contain faces designed for setting large amounts of body text, and others intended primarily as decorative. The presence or absence of serifs represents only one of many factors to consider when choosing a typeface.

Typefaces with serifs are often considered easier to read in long passages than those without. Studies on the matter are ambiguous, suggesting that most of this effect is due to the greater familiarity of serif typefaces. As a general rule, printed works such as newspapers and books almost always use serif typefaces, at least for the text body. Websites do not have to specify a font and can simply respect the browser settings of the user. But of those web sites that do specify a font, most use modern sans serif fonts, because it is commonly believed that, in contrast to the case for printed material, sans serif fonts are easier than serif fonts to read on the low-resolution computer screen.

Many people generally find proportional typefaces nicer-looking and easier to read, and thus they appear more commonly in professionally published printed material.[citation needed] For the same reason, GUI computer applications (such as word processors and web browsers) typically use proportional fonts. However, many proportional fonts contain fixed-width (tabular) figures so that columns of numbers stay aligned.

Monospaced typefaces function better for some purposes because their glyphs line up in neat, regular columns. No glyph is given any more weight than another. Most manually operated typewriters use monospaced fonts. So do text-only computer displays and third- and fourth-generation game console graphics processors, which treat the screen as a uniform grid of character cells. Most computer programs which have a text-based interface (terminal emulators, for example) use only monospaced fonts (or add additional spacing to proportional fonts to fit them in monospaced cells) in their configuration. Monospaced fonts are commonly used by computer programmers for displaying and editing source code so that certain characters (for example parentheses used to group arithmetic expressions) are easy to see.[9][better source needed]

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