Glossary, ContinuedN (Continued)NEGATIVE, PHOTOLITHOGRAPHIC— A film negative having atranslucent image and a black background produced by a process camera andused primarily to make printing plates.NEUTRAL COLOR— (1) A color that lacks hue and intensity; (2) A colorthat contains some amount of its complementary; (3) An earth color.NIB— A point at the end of a pen or marker.NOISE— Adding a random pattern of pixels over an image to add texture,create a new value, or give a painterly effect.NORMAL LENS— Also called STANDARD LENS. A 50mm focal-lengthlens, which most closely approximates normal vision with minimal distortion.OOBLIQUE PROJECTION— A view produced when the projectors are at anangle to the plane of the object illustrated.OCTAGON— A figure having eight sides.OFFSET LITHOGRAPHY— See LITHOGRAPHY. Lithographic printingwhere an inked plate prints on a rubber blanket, which then offsets the imageto paper stock.OFFSET SECTION— A section view of two or more planes in an object toshow features that do not lie in the same plane.OIL PAINT— Any pigment ground in linseed oil or poppy oil.OILSTONE— A stone or abrasive used to sharpen needlepoints and blades.ONE POINT PERSPECTIVE— Also called PARALLEL PERSPECTIVE.When the height and width of an object are parallel to the plane of projection.ONION SKIN— Also called MANIFOLD PAPER. Thin, translucent paperused to make a typewriter carbon copy or to serve as a tissue overlay forwork requiring correction or protection.Continued on next pageAI-40
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