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Oblong
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A term used to describe printed books, catalogs, etc., that are bound on their shorter side; also referred to as album bound.
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Offset
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The most commonly used printing method, whereby the printed material does not receive the ink directly from the printing plate but from an intermediary cylinder called a blanket that receives the ink from the plate and transfers it to the paper.
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Offset Paper
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A term for uncoated book paper.
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Offset Printing
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Printing technique that transfers ink from a plate to a blanket to paper instead of directly from plate to paper.
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Offsetting
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Using an intermediate surface used to transfer ink. Also, an unpleasant happening when the images of freshly printed sheets transfer images to each other.
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Offshore Paper
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Any papers made outside the US and Canada.
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Ok Sheet
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Final approved color inking sheet before production begins.
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Onionskin
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A light bond paper used for typing and used with carbon paper because of its thinness.
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Opacity
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(1) Characteristic of paper or other substrate that prevents printing on one side from showing through the other side. (2) Characteristic of ink that prevents the substrate from showing through.
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Opaque
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(1) Not transparent. (2) To cover flaws in negative with tape or opaquing paint. Also called block out and spot.
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Opaque Ink
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Ink that completely covers any ink under itself.
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Open Prepress Interface
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Hardware and software that link desktop publishing systems with color electronic prepress systems. (OPI)
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Outer Form
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Form (side of a press sheet) containing images for the first and last pages of the folded signature (its outside pages) as compared to inner form.
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Outline Halftone
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Halftone in which background has been removed or replaced to isolate or silhouette the main image. Also called knockout halftone and silhouette halftone.
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Over Run
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Additional printed matter beyond order. Overage policy varies in the printing industry. Advance questions avoid blind knowledge.
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Overhang Cover
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A cover of a book that extends over the trimmed signatures it contains.
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Overprint
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To print one image over a previously printed image, such as printing type over a screen tint. Also called surprint.
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