Sign & Digital Graphics

2013 Buyer's Guide

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Terms of the Trade Reflective Sheeting—Film with very small glass or glass-like materials encapsulated below its surface, creating the ability to bounce light beams back to its source. Registration—In  screen printing, the correct placement of the image to be printed on the substrate. In multi-color printing, registration also refers to the correct alignment of the colors with one another. Regulation—In neon and LED signage, to maintain a constant output level of voltage (or current in some supplies) regardless of input voltage changes and/or output load changes. Regulatory Signs—Signs installed by various government bodies to acquaint the public with traffic laws and other regulations. Relief—The projection of art from a flat surface. Remote Control—A method for changing the messages on electronic changeable copy signs where the data is provided to the control console by telephone. Resampling—Changing the resolution of a bitmap image file without altering the image's physical size. Resin Transfer—Method of heating a color on a carrier sheet (called a ribbon or foil) and printing it onto a substrate. The plastic-based resin is fused onto a material such as vinyl, creating a more-permanent image with waterfastness and UV protection. Resistance—A property of most conductors (wires) that restricts the flow of an electrical current. Resistor—The electronic equivalent of a fixed valve–available in a wide range of values. Resize—To change the reproduction size of an image so prints can be made smaller or larger. Significant up-sizing often results in jaggies. Resolution—The degree of crispness/clarity of an image. In digital imaging, resolution is measured by the number of pixels (or dots) of color information per horizontal inch of an image; the higher the number (measured horizontally and vertically) the more precise the pictured image. In plotting, resolution is the degree of accuracy that a plotter will place a knife-head in relation to a theoretical, perfect location of a coordinate. Retainer—In sign making, the slotted portion of the edge that holds a translucent face within a 116 • Mid-June 2013 • S I G N SBGuide.indd 116 sign cabinet. Also, the projecting rim around a sign face that holds it in place. Retarder—An additive that slows the drying time of ink or paint. Reverse Channel Letter—A  channel letter that has a face and sides but no back. It is pegged out from a background surface. When the inside of the channel is lit, it produced a halo effect around the letter. Revolving Sign—A sign which has the ability to turn 360 degrees because of the presence of an electric motor to drive its moveable parts. All or a portion of the sign may revolve at a steady or variable speed depending on the sign. RGB (Red, Green, Blue)—The three primary additive colors used by monitors and scanners for transferring and representing color data. In digital imaging most input and display are seen in RGB, while printed output is created using subtractive CMYK colors. RGB Display—Any high-quality electronic screen display that makes use of primary RGB colors to produce a full-color display. For example, some electronic message centers achieve full color by utilizing red, green and blue LEDs. RIP (Raster Image Processor)—Software used to create and place dots (or bitmaps) for printing, and then transferring that information to a printer. RSS—In  electronic digital signage, RSS (most commonly translated as "Really Simple Syndication"), is a family of Web feed formats used to publish frequently updated works such news headlines, stock updates, weather reports and the like. An RSS document (called an "RSS feed", "Web feed", or "channel feed") includes full or summarized text, plus metadata such as publishing dates and authorship. Router—In sign-making a router is a machine tool that mills out the surface of metal or wood, usually equipped with various bits and able to remove material along the X,Y and Z axis. In digital signage a router is a networking device whose software and hardware are usually tailored to the tasks of routing and forwarding information. For example, on the Internet, information is directed to various paths by routers. Routing—The elimination of material in a substrate, using a router to remove material. S Samples Per Inch—Unit of measure used to describe the input resolution of a device, such as a  scanner or camera, in one-linear-inch increments. Each data point in an RGB image capture includes separate red, green and blue calculations. Sampling—Selection by a computer of the best pieces of information; in scanning, the best bits to interpret the scanned image and present the best-possible image for editing and printing. Sandblasting—A pressurized stream of sand or synthetic particles used to remove material from a substrate, such as glass, wood or HDU. A rubberized stencil of the artwork is either hand- or computer-cut and applied to the substrate, which is then sandblasted. Sans Serif—Any font or typeface that lacks serifs. See also Serif. Saturation—The intensity of a specific hue, based on the color's purity, measured from 0-100% in the HSV color model. Highly saturated hues have vivid color, while less saturated hues appear grayish. Scanner—Device employing a mechanism such as a CCD array, to scan an image, printed text or artwork and converts it to a digital image. A common example is the desktop (or flatbed) scanner where the document is placed on a glass window for scanning. See also Drum Scanner and Linear Scanner. SCGFP (Secondary-Circuit Ground-Fault Protection)—A ground fault detection system built into  neon transformers based on the UL 2161 Standard, that detects current flow to ground and, if it reaches a preset level (15 mA or greater), turns off the transformer. Scoring—To cut or notch a material prior to bending it. Sufficient scoring of some substrates—glass and some thicknesses of PVC boards, for example—will also allow them to be broken cleanly without cutting them all the way through. Screen—A frame over which fabric is stretched for use in screen printing. The screen supports the  stencil or emulsion through which the ink is forced by the squeegee, creating the print. Screen Angles—In halftone printing, the geometric intervals used to place the four screens in order to eliminate moiré patterns within a print. & D I G I TA L G R A P H I C S 5/31/13 12:37 PM

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