Halftone
The reproduction of continuous tone artwork/images, such as photographs, through a screening process that converts the image into dots of various sizes and equal spacing between centers (AM screening), or dots of equal size with variable spacing between them (FM screening). The dots simulate the tones between light and dark.

Halftone dot
Pattern of different sized dots to simulate continuous tone images.

Hard (dot)
A halftone dot characterized by a sharp, clean-cut edge.

Handmade paper
Paper made by hand using a mold-a frame, which is covered with a flat, rigid screen (western) or flexible screen (oriental). In both cases, the mold is covered by a flat frame called a deckle to contain the run-off of wet pulp, dipped into a vat of wet pulp, shaken to distribute the fibers evenly and drained of its excess water. The wet mat of fibers remaining is the newly formed sheet, which is then dried against blankets and may be hot pressed, cold pressed or air dried.

Hardbound
Another term for casebound.

Hardcover (also casebound, edition binding)
A nonflexible book binding made of thick, glazed board.

Head
The top of a page of text that can be a chapter heading, title line, etc.

Head-to-head imposition
An imposition that requires that pages be laid out with the top of a page (head) positioned across the top of the page (head) opposite it on the form.

Head-to-tail imposition
An imposition that requires that pages be laid out with the top of a page (head) positioned across from the bottom (tail) of the page opposite on the form.

Hickey
Hickeys are stray spots of ink or irregularities in ink coverage on a printed sheet that appear as small white circles with ink in the center. Hickeys are usually caused by paper or pressroom dust, dirt or picking of the printing blanket.

High finish
A term referring to a paper that has a smooth, hard finish applied through calendering or other processes.

Highlight halftone
The lightest or whitest parts in a photograph represented in a halftone reproduction by the smallest dots or the absence of all dots.

Hit
An impression from a stamping die.

Holdout
Holdout refers to a paper's ability to hold ink on the surface consistently so that it will dry in a sharper, more clearly defined dot and produce higher ink gloss. When ink is absorbed into a sheet, it spreads - creating a phenomenon referred to as "dot gain." Higher holdout means a sharper dot and increased ink gloss, but can also cause ink to rub off or mark the next sheet.

Hot pressed
A paper surface that is smooth; produced by pressing a finished sheet through hot cylinders.

Hue
In color, the main attribute of a color that distinguishes it from other colors.

Hydrophilic
Describes paper with an affinity for water.

Hydrophobic
Describes paper that tends to be water repellent.

Hygroscopic
Describes paper that readily absorbs moisture.

Hydropulper
In a pulp or paper mill, this mammoth mixing machine adds water to cooked pulp and filler materials and stirs them to the consistency of oatmeal cereal.