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Hairline (Rule)
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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.
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Hairline Register
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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.
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Half-Scale Black
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Black separation made to have dots only in the shadows and midtones, as compared to full-scale black and skeleton black.
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Halftone
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(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.
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Halftone Screen
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Piece of film or glass containing a grid of lines that breaks light into dots. Also called contact screen and screen.
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Hard Copy
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The output of a computer printer, or typed text sent for typesetting.
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Hard Mechanical
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Mechanical consisting of paper and/or acetate and made using paste-up techniques, as compared to electronic mechanical.
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Head Margin
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That space which lies between the top of the printed copy and the trimmed edge.
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Head(er)
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At the top of a page, the margin.
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Head-to-Tail
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Imposition with heads (tops) of pages facing tails (bottoms) of other pages.
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Hickey
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A term used to describe the effect that occurs when a spec of dust or debris (dried ink) adheres to the printing plate and creates a spot or imperfection in the printing.
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High Bulk Paper
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Paper stock that is comparatively thick in relation to its basis weight.
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High Key Halftone
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A halftone that is made utilizing only the highlight tones down through the middle tones.
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High Key Photo
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Photo whose most important details appear in the highlights.
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High-Fidelity Color
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Color reproduced using six, eight or twelve separations, as compared to four-color process.
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Highlights
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Lightest portions of a photograph or halftone, as compared to midtones and shadows.
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Hinged Cover
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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.
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HLS
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Abbreviation for hue, lightness, saturation, one of the color-control options often found in software, for design and page assembly. Also called HVS.
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Hollow
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That space on the spine of a case-bound book between the block of the book and the case binding.
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Hot Melt
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An adhesive used in the binding process, which requires heat for application.
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Hot Spot
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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.
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House Sheet
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Paper kept in stock by a printer and suitable for a variety of printing jobs. Also called floor sheet.
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HTML
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Stands for HyperText Markup Language. Used by programmers to compose web pages or sites.
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Hue
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A specific color such as yellow or green.
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