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Generally, a font in the computing world refers to a set of glyphs available in many sizes and faces. FONT TYPES AND FORMATS Bitmap Fonts Bitmap fonts are simply collections of images. For each variant of the font, there is a complete set of glyph images, with each set containing an image for each character. For example, if a font has 3 sizes, and any combination of bold and italic, then there must be 12 complete sets of images. Bitmap fonts are not widespread anymore, because other font encoding methods are superior in visual quality and flexibility. In some situations, however, they are still useful. Bitmap fonts are used in the Linux console, the Windows recovery console, and Embedded Systems . Outline fonts Type 1 and Type 3 Fonts Type 1 and Type 3 fonts were developed by Adobe for professional digital typesetting. Using PostScript , the glyphs are described with Bezier Curves , and thus one set of glyphs can be resized through simple mathematical transformations. In practice, however, very large or very small versions of a font need extra Hints to look good. Type 1 fonts used Adobe's proprietary hinting system, which was very expensive. Type 3 fonts were the same as the Type 1 without the hints, and thus looked good at normal sizes. TrueType Font TrueType is a font system originally developed by Apple Computer . It was intended to replace Type 1 fonts, which many felt were too expensive. Like Type 1 fonts, Bezier curves are used to describe the glyphs. It is currently very popular and implementations exist for all major operating systems. Stroke-based font A glyph's outline is defined by the vertices of individual strokes and stroke's profile. It's advantage over outline fonts include reducing number of vertices needed to define a glyph, allowing same vertices to be used to generate a different font that have different weight, glyph width, or serifs using different stroke rules, and the associated size savings. For font developer, editing a glyph by stroke is easier and less prone to error than editing outlines. Stroke-based system also allows rescaling glyphs without altering stroke thickness of the base glyphs. It is heavily marketed for East Asian markets for use on embedded devices, but the technology is not limited to ideograms. Commercial developers included Agfa Monotype (iType), Type Solutions, Inc. (owned by Bitstream Inc. ) (Font Fusion (FFS), btX2), Fontworks (Gaiji Master), which have independently developed stroke-based font types and font engines. Although Monotype and Bitstream have claimed tremendous space saving using stroke-based font on East Asian character sets, most of the saving comes from building composite glyphs, which is part of TrueType specification. METAFONT METAFONT uses a different sort of glyph description. Like TrueType, it is a mathematical font description system, but describes glyphs through the strokes of a circular pen. This means that glyphs produced with METAFONT generally do not have sharp points, as the pen tip is of finite size. SEE ALSO
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