Glossary - H

Hairline rule

The thinnest rule that can be printed.

Hairlines

The thinnest of the strokes in a typeface.

Halftone screen

A glass plate or film placed between the original photograph and the film to be exposed. The screen carries a network of parallel lines. The number of lines to the inch controls the coarseness of the final dot formation. The screen used depends on the printing process and the paper to be used, the higher the quality the more lines can be used.

Hardback

A case bound book with a separate stiff board cover.

Hard disk

A rigid disk sealed inside an airtight transport mechanism. Information stored may be accessed more rapidly than on floppy disks and far greater amounts of data may be stored.

Head

The margin at the top of a page.

Hickies

A dust particle sticking to the printing plate or blanket which appears on the printed sheet as a dark spot surrounded by an halo.

Highlight

The lightest area in a photograph or illustration.