Any kind of cross marks or other symbols applied to a press sheet to assure proper registration.

Abbreviation of Pantone Color Matching System.

The printing method that is most commonly used, where the printed material does not receive the ink directly from a printing plate but from an intermediary blanket, which receives the ink from the plate and then transfers it to the paper.

Any copy which can be reproduced without the use of a halftone screen.

When printed ink colors become lighter or less dense after they have dried on the paper.

Assembling sheets of paper as well as signatures into their proper sequence.

A two-color halftone reproduction which is generated from a one color photo.

A shade of blue which is used in four-color process printing. The C in CMYK. Referred to as process blue as well.

The proportional amounts of process colors used to reproduce a picture, either digitally or when printed on a press.

A term given to paper to give a description its thickness which is relative to its weight.