Hairline (Rule) 

Subjective term referring to very small space, thin line or close register. The meaning depends on who is using the term and in what circumstances. 
 
Half-scale Black 
Black separation made to have dots only in the shadows and midtones, as compared to full-scale black and skeleton black. 
 
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 is also called as contact screen and screen. 
 
Halo Effect 
Faint shadow sometimes surrounding halftone dots printed. Also called halation. The halo itself is also called a fringe. 
 
Hard Dots 
Halftone dots with no halos or soft edges, as compared to soft dots. 
 
Hard Mechanical 
Mechanical consisting of paper and/or acetate and made using paste-up techniques, as compared to electronic mechanical. 
 
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. 
 
Heat-set Web 
Web press equipped with an oven to dry ink, thus able to print coated paper. 
 
Hickey 
Spot or imperfection in printing, most visible in areas of heavy ink coverage, caused by dirt on the plate or blanket is also called bulls eye and fish eye. 
 
High-fidelity Color 
Color reproduced using six, eight or twelve separations, as compared to four-color process. 
 
High-key Photo 
Photo whose most important details appear in the highlights. 
 
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. 
 
HLS 
Abbreviation for hue, lightness, saturation, one of the color-control options often found in software, for design and page assembly. Also called HVS. 
 
Hot Spot 
Printing defect caused when a piece of dirt or an air bubble caused incomplete draw-down during contact platemaking, leaving an area of weak ink coverage or visible dot gain. 
 
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. 
 
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