Desktop Publishing

Desktop publishing, sometimes abbreviated as DTP, is a technique for preparing and printing professional quality products using microcomputers, software, and printers. Articles on the subject, presumably by authors who haven't tried to use the technique, still occasionally suggest that DTP is easy, fast, and cheap. Unless the product is a one-page flyer announcing a gutter-cleaning special, DTP is none of those things. It represents the latest level of automation in an industry that marked the dawn of modernity: typesetting.

BACKGROUND

The invention of movable type by Gutenberg dates back to 1450. This technology, therefore, had a developmental period of more than 525 years before the first microcomputers saw wide use in the mid-1970s. Many different kinds of fonts were designed and refined in this period in variants of which, today, bold and italic are well known to everyone. Terminology and rules related to type size (measured in points), kerning (the space between characters), and leading (the space between lines) developed. In 1884, almost exactly 100 years before the first DTP system introduced by Apple Computer, Ottman Mergenthaler introduced linotype, a technique that cast metal type on the fly, one line at a time, using brass patterns for characters; a person working a keyboard-type device selected the characters to be cast. A year later came Tolbert Lanston's monotype, capable of producing one letter at a time, also from raw metal. Monotype made it much easier to space characters in novel ways. Intertype, which came later, was another line-by-line typesetting system. In all of these cases, the cast metal could be remelted for reuse. These systems are still in use but are driven today by computerized interfaces.

The Standard Generalized Markup Language (SGML) began to be developed in 1960 and is available as International Standards Organization 8879:1986. SGML is a convention for embedding markers in text to be read and interpreted by typesetting programs. SGML is the progenitor of XML (Extensible Markup Language) and also of HTML (Hyper Text Markup Language) the language underneath web pages. SGML was developed in order to automate typesetting and standardize formatting; it is widely used by the Federal Government.

In none of these systems leading up to DTP was page composition itself automated so that the insertion of photographs and other graphics was done at other points in the production process. Printing in true color still requires four passes through a printing press to put down yellow, cyan, magenta, and black—unless the printing process used is color Xerography and the closely related color laser printers.

EMERGENCE OF DTP

Computerization of typesetting came before microcomputers themselves arrived. The first DTP systems were scaled-down versions of typesetting and composition software running on larger and much more expensive minicomputers. Operators sat facing multiple monitors and formatted pages using the same computer's services. These were effective and attractive systems—but they cost a lot of money. No small business could afford such systems unless it was itself in the business of providing typesetting services.

Apple Computer introduced the first full-fledged micro-based DTP system in 1984 but did not effectively get it on the market until 1985; in the mid-2000s, therefore, DTP is just 15 years old. The three major components of the first system were the Macintosh computer, the Aldus PageMaker software system, and a LaserWriter printer with the embedded PostScript software developed by Adobe Systems. The user of this system could sit at the screen and, using a keyboard and a mouse, create a document on screen. As people later said: "What You See Is What You Get," WYSIWYG. At the click of the mouse, the image on the screen would come out on the LaserWriter printer. PageMaker was said to be incredibly easy to use, but not all those who actually used it in the 1980s would agree. The same is true of today's much more sophisticated systems.

Apple was the first commercially sold graphical computer. (Xerox pioneered the concept but did not take it to market.) The graphical interfaced required the use of complex geometrical techniques to render characters and images by vector graphics, namely by a description of drawing directions. Raster graphics, which are static images made up of dots, do not scale satisfactorily, but a vector description of a letter or a drawing can be executed at any scale with very fine precision. The PostScript language developed by Adobe was very compact and efficient—it took up very little space on the printer; at the same time, it could render the picture of a screen perfectly. At this time technology to render color and advanced techniques for handling photograph were still in the future.

MODERN DTP

Some 15 years later and counting, DTP has reached a certain maturity. Many different software packages are on the market; Aldus PageMaker remains a factor, but the two leading producers in the mid-2000s were QuarkXpress and Adobe's InDesign. Adobe is also a leader in photographic manipulation (PhotoShop) and has become the de facto standard for web-based publishing using PDF, the Portable Document Format. Adobe Acrobat can be used to make PDF files; Adobe distributes the Acrobat Reader free of charge, used for reading (but not for editing or creating) PDF files. A PDF file printed on an appropriate device can, in fact, be a professionally typeset document if its preparer had the requisite skills. A competitive see-saw in the software market has been the rule. At present, David Blatner, a leading expert on both QuarkXpress and InDesign (he has written extensive books on how to use both) believes, according to a recent article in eWeek, that InDesign has the competitive edge. Such judgments, of course, are always merely snapshots at a given point in time.

DTP systems are today available for every type of operating system, not merely Macintosh operating system (MacOS). Memory installed in computers and in printers, and disk drives in computers with many gigabytes of storage, make it possible to handle very large publications with many hundreds of photographs.

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