Sign & Digital Graphics

2013 Buyer's Guide

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Terms of the Trade Pegged Out—Mounting letters so they are separated from the surface on which they're being attached. Although an important part of affixing reverse channel letters, metal, plastic or wood letters may also be pegged out to keep stains from washing down on the letters or for visual impact. Perforating Wheel—A toothed wheel on a handle that allows it to rotate freely, used to trace line art, creating perforations for pattern making. Also called a pounce wheel. See also Pounce Pattern and Pounce Pad. Periodic Scheduling—A type of scheduling that defines ranges of time within which events are allowed to play. Permit—A license granted by the appropriate authorities to allow a sign to be erected. PDF (Portable Document Format)—Electronic document  format from Adobe Systems Inc. that allows the packaging of files for distribution across platforms for display and printing as originally designed. Phosphors—Chemical powders used to coat fluorescent tubes. A range of phosphors is available to produce a large variety of colors and whites. Photo-Cut—Method of vectorizing an image in a parallel-line pattern to give a rough, but recognizable, rendering of sharp outlines from a high- to medium-contrast photograph. Photoinitiator—A molecular ingredient in UV-curing inks that absorbs incident UV energy, becomes excited and initiates a chain reaction with liquid oligomers and monomers, resulting in polymerization and the creation of a hardened UV ink. Photostencil—A stencil prepared using photographic, rather than mechanical methods. Pictogram—A pictorial symbol commonly found in environmental graphics and regulatory (traffic) signs. Pictorial—A picture on a sign that does not involve animation. A pictorial can range from one-color graphic symbols and posterized pictures to full-color scenes and portraits. Piezo Inkjet—A type of printhead that uses the oscillations of electrically-stimulated piezoelectric crystals to force ink through inkjet nozzles. Pigment—A compound used to color other materials, such as paints and inks. Pigments are insoluble, finely ground particles and may be organic or inorganic. 114 • Mid-June 2013 • S I G N SBGuide.indd 114 Pinch Roller—Wheeled holder, usually tensioned by springs that clamp vinyl or other materials between it and a grit wheel for transporting the medium through a friction-feed plotter. Pole Sign—A free-standing sign, usually double-faced, mounted on a round pole, square tube or other fabricated member without any type of secondary support. Pixel—With digital production, a part of a picture that can be located and placed as an element along the X and Y axes. Polling—Method where a computer sends a signal to a plotter or printer requesting information on the current production area. The device sends back production parameters; the production software then sets panels based on the information. Works only with serial communications. Pixelization—Process where the number of pixels are simply multiplied to increase resolution. The result is a higher dpi but the altering of detail from smooth to square-step lines, or jaggies. Plasma Display Panel (PDP)—A type of flat screen display device that is used for television, computer monitors, and dynamic signage. Similar to an LCD panel, they consist of two layers of glass surrounding cells of xenon and neon glass. Surrounding electrodes switch the cells on and off, causing them to emit light and create the picture. This emitted light makes PDPs have an appealing vibrancy that competes with Cathode Ray Tubes (CRTs), the technology of traditional televisions. Also known as gas plasma displays or plasma displays Plastic-Faced Letter—Channel letter in which the front of the channel is covered by plastic material or facing, hiding the neon tube from view. Plot Plan—A drawing or sketch showing the layout looking down on the site on which a sign is to be erected. Plotter—Device that interprets information sent from a computer and moves a tool head to a series of coordinates based on the device's X and Y axes. Sign makers use a plotter equipped with a knife to cut vinyl, with the X and Y coordinates forming an outline that can be weeded and installed on a surface. Plug-Ins—Small, limited-purpose programs that work with and add capabilities to larger graphics applications such as Photoshop. Polling Interval—The length of time that may elapse before a media player checks for a certain condition, such as whether a job has been delivered to its job folder, or whether its script has been updated. Polycarbonate—A type of plastic used in sign faces, noted for its heat-resistance and impact strength. Polymer—A stable chemical compound or mixture of compounds consisting essentially of repeated structural units. Monomer-based UV-curing inks, once cured, become a solid polymer. Polymerization—The process of combining unstable molecules to form solid polymer structures. Specifically in UV-curing, polymerization describes the chain growth of monomers  and/or  oligomers  that have been triggered by a photoinitiator and/or sensitizer in the ink. Polypropylene—A type of plastic used in banners, noted for its flexibility at low temperatures and its resistance to chemicals. Noted for is recyclability. Polyurethane—Any of various synthetic polymers used in elastic fibers, molded products, coatings, etc. Porcelain Sign—A traditional type of metal sign utilizing porcelain enamel paints topped by a ceramic slip to create a durable, glass-like surface that's impervious to the environment. PMT (Photomultipliers Tubes)—Light-sensitive elements used in drum scanners. PMTs accept four beams of light from a scanner—RGB and a separate beam for image sharpness—for eventual converting to digital information. Usually seen as more-sensitive and having greater dynamic range than CCD-based scanners. Port, IP—In electronic digital signage , a numerically designated access point for messages of a particular type in TCP/IP network communications. Polariscope—An instrument for ascertaining, measuring, or exhibiting the properties of polarized light; can be used to check neon tubes for stress. Positive Space—In design, the copy and art seen on a sign face. The opposite of negative space. Portable Sign—A freestanding, on-premise sign that is not designed to be permanently affixed to a base. Poster—A series of paper sheets printed for use on a billboard. Also, a type of sign, typically printed on paper, and intended for indoor use. & D I G I TA L G R A P H I C S 5/31/13 12:37 PM

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