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Hairline Register - Register within plus or minus one-half row of dots.

Halftone - An image composed of tiny dots whose variations in size create the illusion of variations in tone. Traditionally, a halftone screen was used to convert a continuous tone image into a halftone; such screening is currently done electronically.

Halftone-based digital proofing - Producing a proof with reliable color and halftone pattern directly from a digital file, usually by electronic process, without producing a set of film negatives.

Hard Copy - A printed paper copy of output in readable form. It is also a transparency film or photograph of an image displayed on the monitor.

Hard Dots - Second generation dots or laser-generated dots that have hard edges without any fringe.

Hard Proof - A color proof made on a substrate from production films or on a substrate directly from the stored pixel data. The latter is usually referred to as a digital hard proof, and a video proof as a digital soft proof.

Head - The top of a page or book.

Heatset - Web printing process whereby non-absorbent paper goes through the press and the ink is dried by heat.

Hickey - Spot on a printed sheet usually due to dust, lint or bits of paper.

Highlight - The lightest area of a photograph that has the smallest or fewest dots when made into a halftone.

HLS/HSV - Abbreviations for hue, lightness and saturation and hue saturation and value. These are different names for the same color-control options found in most desktop software.

Holdout - A property of coated paper with low ink absorption which allows ink to set on the surface with high gloss. Too much holdout can cause ink to rub off or mark the next sheet.

Hot Spot - Printing defect caused when a piece of dirt or an air bubble caused incomplete drawdown during contact platemaking, leaving an area of weak ink coverage or visible dot gain.

House Sheet - Paper kept in stock by a printer and suitable for a wide variety of printing jobs.

Hue - The attribute of color that designates its dominant wave length and distinguishes it from other colors.