Glossary, ContinuedO (Continued)ONSCREEN— An image that appears on the computer or television screen.OPAQUE— (1) Impermeable to light; not transparent or translucent; (2) Topaint over unwanted portions of a negative with a solution to prevent lightfrom seeping through.OPAQUE PROJECTOR— A device that projects an opaque object to adesired size on another surface.OPAQUE WATERCOLOR— See WATERCOLOR. A creamy, opaquepaint-like gouache or tempura, available in tubes, jars, or by mixing whitewith transparent colors.OPAQUING— Covering up with opaque paint.OPTICAL CENTER— A point slightly above (10%) the geometric center ofa layout that the eye perceives as the center.OPTICAL ILLUSION— An unreal or misleading image perceived by the eyeas real.OPTICAL SPACING— The arrangement of spacing between letters forlegibility and appearance, which varies with the shape of the letters toachieve optical equalization.ORGANIZATION CHART— A block chart or diagram showing the names,titles, departments, and responsibilities of personnel in an organization.ORIGINAL— See MASTER. Copy submitted to the printer forreproduction.ORTHOGRAPHIC PROJECTION— A method of projection with sixprincipal views.OSCILLATING AIRBRUSH— An airbrush with a reciprocating needle usedfor fine detailed work.Continued on next pageAI-41
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