NEGATIVE, PHOTOLITHOGRAPHIC A film negative having a
translucent image and a black background produced by a process camera and
used primarily to make printing plates.
NEUTRAL COLOR (1) A color that lacks hue and intensity; (2) A color
that 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-length
lens, which most closely approximates normal vision with minimal distortion.
OBLIQUE PROJECTION A view produced when the projectors are at an
angle to the plane of the object illustrated.
OCTAGON A figure having eight sides.
OFFSET LITHOGRAPHY See LITHOGRAPHY. Lithographic printing
where an inked plate prints on a rubber blanket, which then offsets the image
to paper stock.
OFFSET SECTION A section view of two or more planes in an object to
show 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 paper
used to make a typewriter carbon copy or to serve as a tissue overlay for
work requiring correction or protection.
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