Hairline Register
Printing registration that lies within the range of plus or minus one half row of dots. It is the thinnest of the standard printers’ rules.
Halftone
Tone graduated image composed of varying sized dots or lines, with equidistant centers.
Halftone Screen
A sheet of film or glass containing ruled right-angled lines, used to translate the full tone of a photo to the halftone dot image required for printing.
Hard Dot
The effect in a photograph where a dot has such a small degree of halation that the dot shows quite sharp.
Head Margin
That space which lies between the top of the printed copy and the trimmed edge
Hexachrome
A color separation process developed by Pantone
Hickies
Imperfections in presswork due to dirt on press, trapping errors, etc.
Hot Melt
An adhesive used in the binding process, which requires heat for application.
House Sheet
This is a term that refers to a paper that a printer keeps on hand in his shop.
