Glossary, ContinuedT (Continued)TOUCH SCREEN TECHNIQUE— Activating the pixels on a CRT screenthrough the touch of an electronic light pen or the fingertip.TRACING PAPER— A thin, transparent, or translucent paper used fortransferring an image from one surface to another by tracing.TRACKBALL— See JOYSTICK or MOUSE.TRAMMEL— A mechanical device used to draw an ellipse.TRANSFER SHEET— Preprinted characters and symbols on cellophane oracetate used in preparing cold composition, camera-ready copy.TRANSLUCENT— The characteristic of allowing light to pass throughwithout permitting objects to be seen clearly through it.TRANSPARENCY— Any transparent material intended for projection thatbears an image.TRANSPARENT— The characteristic of allowing light and objects to beseen clearly through it.TRAPS— A slight overlap of the outline of an element to prevent white spacefrom showing around the edges minimizing the effect of press platemisalignment.TRIAD— The use of any three pigments equally spaced on a color wheel.TRIANGLE— A triangular shaped ruling guide available in various sizes andangles usually made of clear plastic or metal.TRIM MARKS— Marks used on printed sheets or other substrate to indicatewhere to cut or trim stock both vertically and horizontally.TRIMETRIC PROJECTION— An axonometric projection of an objectwhere no two axes make equal angles with the plane of projection requiringthree different foreshortening ratios.Continued on next pageAI-62
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