Halftone
(1) To photograph or scan a continuous tone image to convert the image into halftone dots. (2) A photograph or continuous-tone illustration that has been halftoned and appears on film, paper, printing plate or the final printed product.

Halftone Screen
Piece of film or glass containing a grid of lines that breaks light into dots. Also called contact screen and screen.

Head(er)
At the top of a page, the margin.

Head-to-tail
Imposition with heads (tops) of pages facing tails (bottoms) of other pages.

Hickey
Spot or imperfection in printing, most visible in areas of heavy ink coverage, caused by dirt on the plate or blanket. Also called bulls eye and fish eye.

Highlights
Lightest portions of a photograph or halftone, as compared to midtones and shadows.

Hinged Cover
Perfect bound cover scored 1/8 inch (3mm) from the spine so it folds at the hinge instead of, along the edge of the spine.

House Sheet
Paper kept in stock by a printer and suitable for a variety of printing jobs. Also called floor sheet.

Hue
A specific color such as yellow or green.