| 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 which receives the ink from the plate and transfers it to the paper. |
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| Offset gravure |
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A complex offset process involving multiple transfers between the gravure plate, the plate cylinder and a solid rubber plate. |
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| Offset paper |
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A term for uncoated book paper. |
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| Off-shore paper |
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Any papers made outside the US and Canada. |
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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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Quality of papers that defines its opaqueness or ability to prevent two-sided printing from showing through. |
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| Opaque |
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A quality of paper that allows relatively little light to pass through. |
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| Opaque ink |
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Ink that completely covers any ink under itself. |
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| Orginal |
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Any kind of artwork that is used to make more copies. |
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| Orthochromatic |
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Any light sensitive surfaces that are not sensitive to red. |
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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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| Overlay |
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A transparent sheet placed over artwork, in register with the work it covers; this is used to call out other color components of the work, instructions or corrections. |
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| Overlay Proof |
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A process of proof making whereby the color separations are individually exposed to light sensitive film. This film is then set in registration with a piece of white paper in the background. |
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| Overprinting |
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Any printing that is done on an area that has already been printed. |
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| Overrun |
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Quantities of sheets printed over the requested number of copies. |
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| Overset |
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Type that is set in excess of the allotted space. |
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