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The Heidelberg website glossary explains, in alphabetical order, a multitude of terms relevant to printing, as well as some terms used in Heidelberg's product catalogue.

Simply click on the letter of your choice to access the information you need.

Oblique
Term used for typefaces that slope forwards. Such fonts usually serve as a substitute for a non-existent italic version of the typeface in question.
OEB (Open E-Book)
A group that aims to promote electronic books (e-books) by defining a standard for their format. Under the name Open E-Book Publication Structure, the group of manufacturers known as the Open E-Book Authoring Group published the first standard of this kind in September 1999. It is designed to allow publishers to release their publications in a format that can be displayed by all e-book readers. The HTML and XML formatting languages are the technical basis for this specification.
Offset gravure conversion
A process using screened offset films as originals for the production of gravure printing forms. The particular advantage of this method is that proofs can be made using offset films rather than employing a high-outlay preparation process on a gravure printing press. This is possible because the tonal value reproduction of the offset originals corresponds with that of the gravure product.
Offset paper
A general term for stock suited for offset printing, including both uncoated wood-free and wood pulp papers as well as uncoated recycled papers that have been calendered or machine-finished.
Offset printing
A lithographic printing process based on the different wetting characteristics of the printing and non-printing areas of the printing form. When printing, the lipophile or “oil-friendly” image areas absorb the oil-like printing ink and the blank hydrophile areas repel it. Offset printing works is an indirect printing procedure in that the printing form transfers the printing image onto a blanket cylinder, which in turn prints the paper or other material. There is a distinction between sheetfed offset and web (or rotary) offset printing. The former prints on paper sheets and the latter on a paper web.
Ogilvy, David (1911-1999)
British entrepreneur who was known in his later years as the “Great Old Man” of advertising, and was often referred to as one of the geniuses of the industry. His book “Confessions of an Advertising Man” (1963) is an industry classic and was called the “Advertiser’s Bible.” In 1938, Ogilvy came to the U.S., founding ten years later the Hewitt, Ogilvy, Benson & Mather (HOB&M) advertising agency in New York. The company – now called Ogilvy & Mather – is presently represented in over 70 countries.
One-directional fold
A fold in which the untrimmed sheet is only creased once.
One-to-one marketing
A term for market research, advertising and sales which are directed at individual customers and take account of their individual wishes and preferences. Internet technology, which allows direct interaction with consumers, has made one-to-one marketing possible in markets with large numbers of customers who in the past could only be contacted through mass communication. Online dealers can use software which automatically evaluates the behavior of visitors to their web site, and then respond with targeted individual offers.
Onionskin paper
A glazed, wood-free, show-through paper with a grammage of 30 to 39 gsm. White or colored stocks with grammages of 25.30 or 40 gsm are erroneously termed onionskin.
Opacity
The degree of a paper's resistance to light. Paper printed on both sides must have optimum opacity, a property enhanced by a higher wood content as well as fillers such as kaolin, talcum and titanium dioxide. Back to top


Open source software
Software available free of charge as an alternative to conventional commercial models. Open source software can be used and disseminated at will, and the source code is open and can be changed as required. The only condition is that the user make such changes known and pass this information on to others. Open source software is the shared intellectual property of all developers and users and, thanks to the collaboration, achieves a higher level of quality than software produced using conventional means. The best known example of open source software is the Linux operating system.
Operating software
Software for the organization of data input and output, the administration and use of storage space, and the operation of application software. It forms the basis of additional programs and creates an interface between software and the computer.
Output frequency (output resolution)
Measurement that indicates how many pixels were digitized per unit of length and corresponds to the resolution of the image data. For multi-color offset printing with a resolution of 60 dots per centimeter (equivalent to 150 dots per inch), the output frequency should be in the range of 300 dots per inch so that four pixels (two in each direction) are provided for the rendition of the dot. In black and white images, the output frequencies are up to 2400 dots per inch, as all details must be produced. Depending on the necessary scale-ups and scale-downs of the original to be reproduced, the necessary resolutions in the scanner are substantially higher or lower.
Overlap printing
A previously printed color area that is still present behind another object or area. See “knock-out”.
Ozalid copy (dyeline paper, blueprint)
Paper used as proofs for checking the completeness, position and content of printing copy. The basis for this was the diazotype process patented in 1917 by the Benedictine father Gustav Kögel. Back to top


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