Hz-program

Hz-program was a proprietary, patented typographic composition computer program, created by German typeface designer Hermann Zapf. The goal of this program was "to produce the perfect grey type area without the rivers and holes of too-wide word spacing."

In a 1993 essay, Zapf explained the history of Hz-program, which included work at Harvard University prior to his current work at the Rochester Institute of Technology, the first university in the world to establish a chair for research and development on the basic structures of typographic computer programs. He cited the development of the Macintosh as a big step:

...in 1984 Steve Jobs with his Macintosh started in a completely new direction. New software was needed, and typographic presentation on the screen could be more varied and easier to handle. The possibility of getting various typefaces without any big investment enlarged the typographic palette very quickly in the following years. More and more quality was wanted, and plenty of computer space was now available and cheap for everybody. Software was offered for all kinds of solutions from many new companies. This was the time formed to begin work again on a high-level typographic computer program. People now took such ideas seriously and not just as the dreams of a perfectionist. What was tailored at RIT in the seventies has been refined in a final version together with URW in Hamburg since 1988. Our goal was to include all the digital developments available.

Little is known about the composition algorithm created by Zapf and implemented in Hz-program; in the same essay, Zapf stated it is "partly based on a typographically acceptable expansion or condensing of letters, called scaling. Connected with this is a kerning program which calculates kerning values at 100 pairs per second. The kerning is not limited only to negative changes of space between two critical characters, but also allows in some cases positive kerning, which means the addition of space."

The Hz-program was patented by URW (the patent expired in July 2010). Later, it was acquired by Adobe Systems for inclusion as the composition engine in Adobe InDesign application. It is not known if the Hz-program algorithm is still included in latest releases of InDesign.

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