Glossary — I
Imagesetter
Laser output device using photosensitive paper or film. An imagesetter is an ultra-high resolution large-format computer output device. It exposes rolls or sheets of either photographic film, bromide paper or plate to a laser light source. Development (processing) usually occurs in a unit separate to the imagesetter, as does raster image processing. Imagesetter setter output ranges in width, usually 300 to 1,120 mm. The resolution of an imagesetter is typically between 1200 and 4800 dpi. The imagesetter has been largely superseded by the platesetter.
Imposition
Arrangement of pages on mechanicals or flats so they will appear in proper sequence after press sheets are folded and bound. Imposition is one of the fundamental steps in the prepress printing process. It consists in the arrangement of the printed product’s pages on the printer’s sheet, in order to obtain faster printing, simplify binding and reduce paper waste. Correct imposition minimizes printing time by maximizing the number of pages per impression, reducing cost of press time and materials. To achieve this, the printed sheet must be filled as fully as possible.
Ink Balance
Relationship of the densities and dot gains of process inks to each other and to a standard density of neutral gray
Ink Holdout
Characteristic of paper that prevents it from absorbing ink, thus allowing ink to dry on the surface of the paper. Also called holdout.
Ink Jet Printing
Method of printing by spraying droplets of ink through computer-controlled nozzles. Also called jet printing.
Inner Form
Form (side of the press sheet) whose images all appear inside the folded signature, as compared to outer form.
In-Plant Printer
Department of an agency, business or association that does printing for a parent organization. Also called captive printer and in-house printer.
Inserts
Within a publication, an additional item positioned into the publication loose (not bound in).
Integral Proof
Color proof of separations shown on one piece of proofing paper, as compared to an overlay proof. Also called composition proof, laminate proof, plastic proof and single-sheet proof.
ISBN
A number assigned to a published work and usually found either on the title page or the back of the title page. Considered an International Standard Book Number.