Glossary

The PRINTING United Alliance Glossary serves as an excellent industry terminology resource. It is the language by which we all communicate. Without it, universal understanding would be impossible.

To keep our constituents well informed about changes to the increasingly complex industry terminology, PRINTING United Alliance has developed this glossary of terms. Definitions are for general reference only. Usage may vary between companies, individuals, or national and country customs. The information presented is as accurate as the authors and editors can ascertain and PRINTING United Alliance assumes no responsibility for the use of information presented herein.
  • Color Key
    A registered trademark of the 3M Company for an overlay color proofing system that allows the checking of registration and tint screen combinations in process color reproductions prior to actual press proofs.
  • Key
    (1) Master layout or flat that is used as a positioning guide for color artwork and for image assembly of other film flats; (2) Any special quality of the surface or of a previous coat of ink, which assists adhesion of a subsequent coat. (A rough or abraded surface provides a mechanical key for adhesion of an applied ink or film).
  • Key height
    The measured distance from the base of a keypad to the top surface of the key.
  • Key plate
    In color printing, the plate used as a guide for the register of other colors, and normally contains the most detail.
  • Key travel
    The distance a switch moves to close an electrical contact.
  • Keyline
    An outline drawing or finished art, which shows maximum detail, to indicate the exact shape, position, and size for such elements as halftones and type.
  • Low key
    A photograph or other image whose tonal range is mostly in the shadow regions.
  • Monkey pot
    A small crucible for glass melts.