a printed sheet after it has been folded; also a client's "John Hancock" on proofs and press sheets approving content.

the typically undesirable condition in which the printed images on the reverse side of the sheet can be seen through the paper surface under normal lighting conditions.

the short cross lines or "feet" at the ends of the main strokes of many letters in certain type faces.

a film of ink printing in the non-image areas of a plate where it should not occur.

the fitting of 2 or more printing images in exact alignment with each other.

the subtractive primaries: cyan, magenta and yellow; used with black in 4-color process printing (also known as CMYK).

when ink from a printed sheet rubs off or transfers to the next sheet.

an undesirable pattern caused by the improper use of halftone screen angles, or when a pattern within an image conflicts with proper halftone patterns.

an abbreviation for a quantity of 1000 sheets of paper.

the conversion of a continuous tone original into a high contrast image consisting only of black and white.