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Printing Glossary

This glossary of printing terms was created by people working in today's printing industry and is brought to you by MirPrint.com. It has been revised and edited and we have rewritten some technical descriptions in every day language to help the non technical person. Any suggestions that you may have on how we can improve this glossary will be carefully considered. Please send your comments and any new definitions to us at MirPrint.com.

Head(er)

The term Header has several meanings: In typography, header means any text that appears at the top of a page but is not part of the body text, such as a title, author, chapter title, etc. A header appearing on every page is called a running head. In computing, header is a shorthand term for header information. See Header Information. In digital imaging, a header is also a term for information located at the beginning of a sector on a CD-ROM, used to quickly access data for playback.

Header

The term Header has several meanings: In typography, header means any text that appears at the top of a page but is not part of the body text, such as a title, author, chapter title, etc. A header appearing on every page is called a running head. In computing, header is a shorthand term for header information. See Header Information. In digital imaging, a header is also a term for information located at the beginning of a sector on a CD-ROM, used to quickly access data for playback.

Head-to-tail

Head-to-Tail is a form of back printing such that the top of the copy (or other printed image) on the back side of the sheet is "next" to the bottom of the copy on the front side of the sheet, read by turning the page over from top to bottom.

High-fidelity Color

High-fidelity is a method of color printing that utilizes additional process inks to produce a greater range of color on the printed piece. There are many different versions of high-fidelity printing, but they all use conventional or enhanced versions of CMYK inks plus additional colors to increase the color gamut. Like four-color printing, a halftone negative is made for each of the individual color components. Instead of four separate negatives that are required for CMYK color separations, five or more separations may be required, depending on the high-fidelity process used. Plates are then exposed using the halftone negatives. The exposed plates are then ready for printing the application using the appropriate ink colors.

Highlights

A Highlight is the brightest area(s) of an image, printed with the smallest amount of ink transfer and/or the smallest halftone dot, in contrast to shadows and middle tones. A highlight which comprises the whitest neutral area and prints with the smallest dot is known as a diffuse highlight, in contrast to a specular highlight, which is a reflection of a light source within an image and contains no detail nor any halftone dots at all.

Hinged Cover

A Hinged Cover is a flexible joint on the front and back of a case-bound book where the covers intersect with the spine. The hinge allows the book to open without breaking the spine.

Hot Spot

A Hot Spot is a paper defect characterized by a thin spot or a hole in a paper web caused by the growth of bacteria during papermaking and that were formed into the paper. Slime spots and holes are a source of web breaks.

House Sheet

The term House Sheet refers to paper kept in stock by a printer and is suitable for a variety of printing jobs.

Hue

Hue is the primary and most basic attribute of a color that makes it distinct from another color, determined by its dominant wavelength of light on the visible spectrum. In ink manufacturing and color matching, hue is more commonly known as shade. Two other aspects of color, in addition to hue, are value and chroma.