H

hairline register – Register within ± 1/2 row of dots.

halation – In photography, a blurred effect, resembling a halo, usually occurring in the highlight areas or around bright objects.

half binding – A style of binding wherein the shelf-back and the corners are bound in a different material from that used on the sides.

halftone negative artwork (screened negative) – The negative film produced when continuous-tone artwork is shot through a halftone screen.

halftone positive artwork (screened positive) – A photographic positive containing a halftone image.

halftone screen – An engraved glass through which continuous tone copy is photographed and reduced to a series of dots for halftone printing.

halftone – Reproduction of continuous tone artwork with the image formed dots of various sizes.

handmade finish – Paper with a rough finish resembling handmade paper.

hard (dot) – a halftone dot characterized by a sharp, clean cut edge.

hardbound – Another term for casebound.

hardcover (casebound, edition binding) – Nonflexible book binding made of thick, glazed board.

hard-sized – Paper that has been treated with a large amount of size to increase its resistance to moisture. Slack-sized is the opposite.

hard-wood – Wood from deciduous trees having short fibers.

head trim – The amount allowed for the top trim.

headband – A small strip of silk or cotton used for decoration at the top of a book between the sheets and the cover. In hand binding, a real tape to which the signatures are sewn.

headbox – On a paper machine, the box that dispenses the appropriate amount of furnish (pulp) into the papermaking process.

head – The top of a page of text which can be a chapter heading, title line, etc.

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

heat-set inks – Inks used in high-speed web offset. They set rapidly under heat and are quickly chilled.

hickeys – In offset, spots or imperfections in the printed image traceable to such things as dirt on the press, dried ink skin, paper particles, dust, etc.

high bulk – A paper (normally book paper) specifically manufactured to retain a thickness not found in papers of the same basis weight. Frequently used to give thickness to a book with minimal amount of pages.

high contrast – In photography, describes a reproduction in which the difference in darkness between neighboring areas is greater than in the original.

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

high key picture – A continuous tone photo made up of predominantly highlight (white) areas.

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.

high-speed printer – Computer which prints in excess of 300 lines per minute.

hinges – The flexible joint where the covers of a hardbound book meet the spine, permitting the covers to open without breaking the spine of the book or breaking the signatures apart.

hit – An impression from a stamping die.

holdout – A term referring to papers that retain much of the resinous ink components on the surface of the sheet rather than absorbing them into a fiber network. Papers with too much holdout cause problems with setoff.

hue – In color, the main attribute of a color which distinguishes it from other colors. See Chroma.

humidity – Moisture condition of the air. Relative humidity is the percent of moisture relative to the actual amount which air at any given temperature can retain without precipitation.

hydra pulper – Vat with a special type of agitator used to hydrate and prepare pulp for papermaking.

hydration – A papermaking process that involves beating the pulp so as to increase its ability to hold water and produce a paper with the proper moisture content.

hydrophilic – Describes paper with an affinity for water.

hydrophobic – Describes paper that tends to be water repellent.

hygroscopic – Describes paper that readily absorbs moisture.