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Offsetting: Using an intermediate surface used to transfer ink. Also, an unpleasant happening when the images of freshly printed sheets transfer images to each other.
Offset Paper: Term for uncoated book paper.
Ok Sheet: Final approved color inking sheet before production begins.
Opacity: The amount of show-through on a printed sheet. The more opacity or the thicker the paper the less show-through.
Outline Halftone: Removing the background of a picture or silhouetting an image in a picture.
Overlay: The transparent cover sheet on artwork often used for instructions.
Overrun or Overs: Copies printed in excess of the specified quantity. (Printing trade terms allow for + - 10 % to represent a completed order.)
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