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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.

Japanese papers
Papers made in Japan using the fibers of native plants. Authentic Japanese paper, known in Japanese as washi (wa = Japan and shi = paper), is made from kozo, mitsumata, gampi or kuwakawa (mulberry tree). Manual production involves dipping the sieve, which is usually made of bamboo, several times into the paper pulp using a particular rhythm.
Java
An object-oriented programming language developed by computer manufacturer Sun Microsystems specifically for Internet applications. Programs written in Java are not translated into “machine language” but into a computer-independent code so that they can be executed on any computer. During execution, Java is converted into a code that the computer “understands.”
JavaScript
A so-called script language for Internet sites or, to be more precise, a language for programs directly integrated into Internet sites and executed by the browser. It can be used to trigger processes that are impossible with the HTML formatting language. JavaScript was developed by software producer Netscape and features elements similar to the Java programming language.
JDF (Job Definition Format)
A format that grew out of an initiative by Heidelberger Druckmaschinen AG, Adobe Systems, MAN Roland and Agfa and now supported by CIP4. It forms the basis for the non-proprietary integration of print processes, is based on the XML formatting language and embraces a definition for describing print jobs, a message format and an associated transfer protocol.
Job printing
Term used to describe lower volume or short-run printing assignments, for example for individuals or small businesses. Probably the oldest example of job printing is the letter of indulgence from the Roman Church which dates back to the 15th century.
Job ticket
A digital “job folder” at the prepress stage of the production process where instructions for imposition operations, trapping and OPI are stored, as well as output parameters and printing and finishing information.
JPEG
A common format developed by the Joint Photographic Experts Group for compressing image files in RGB mode, using which file sizes of images can be reduced by up to 95 percent. Though it involves a loss of image information, the degree of compression can be selected so that the losses remain within acceptable limits. JPEG requires no license and is internationally standardized (ISO 10918). It uses the “Discrete Cosine Transformation” (DCT) method, where image sections of 64 pixels each are processed. A new compression method, known as JPEG 2000, is currently being developed, which uses what are known as “wavelets” and is said to be able to compress images by 20 percent more than JPEG with better image quality. JPEG 2000 will support non-lossy compression, as well as other color modes (such as CMYK) and color management.
JPG
Customary file extension for images compressed using the JPEG method.
Just-in-time
Term used in industrial production to describe a process where suppliers deliver their goods at the precise moment they are required in the production flow, thus eliminating any need for storage at the production location. Just-in-time production requires efficient management, an effective logistics system, and a data link between suppliers and the manufacturer. Back to top


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