Sign & Digital Graphics

2012 Buyers Guide

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Page 82 of 103

Interpolation—Any mathematical averaging technique used to increase the size of an image fi le by creating more pixels, used to increase tonal value and apparent resolution. Interpolation—Process for increasing resolution of an image by creating new pixels via an averaging of the size and colors of surrounding pixels. The result is more dots-per-inch (dpi) in resolution, although some sharpness may be lost. Internet Service Provider (ISP)—A company that provides Web hosting, FTP hosting, e-mail and other internet services. Interrupt Scheduling—In electronic digital signage, a type of scheduling for pages that causes a scheduled page to play at a precise time, interrupting any other script activity currently occurring. Invariant Color—A color that isn't altered by changes in illumination. IP Address—an address in four-part numerical format that uniquely identifi es a computer accessible over a TCP/IP-based LAN or the Internet. For example, IP Multicast—(Internet Protocol Multicast) IP Multicast is a networking transmission protocol allowing multiple computers to simultaneously receive the same transmission. This is faster than sending an information packet to each individual computer, and is an effi cient way to update many remote locations simultaneously. Each media player site is "tuned in" for the packets being sent by the broadcast server. IP Multicast is not limited to the Internet and terrestrial connections, but can also be broadcast over a satellite to be received by inexpensive VSAT dishes—often already part of a company's infrastructure for their WAN. J Jaggies—Refers to the stair-step appearance of the edges of digital images; created when the image resolution is too low. Job—A command or series of to perform maintenance tasks on one or more media players. Jobs typically involve uploading and downloading scripts, log fi les, and media fi les. Job File—A relatively small fi le that is created by network manager and placed in the job folder of each media player targeted by that job. The job fi le instructs the player on job tasks it should execute, such as downloading an updated script, deleting a fi le, instantly. JPEG/JPG (Joint Photographic Experts Group)—A type of compressed computer fi le usually used when sending photographic images through the Internet. K Kerning—The process of moving pairs of letters farther apart or closer together to make them appear more evenly spaced. Kiosk—A small structure used for posting temporary signs and notices. Knife Bevel—Angle of the vertical cutting edge of a plotter blade. Bevels can be between 30 degrees for general vinyl, and 60 degrees for sandblast mask. L L*a*b*—Color space calculated with values of lightness (L) and attributes of red-green (a) and yellow-blue (b). Most commonly associated with CIE for a non-device-dependent coordination of color. The two-dimensional reference defi nes colors and color spaces based upon physiological measurements of human color vision. Lacquer—A quick-drying clear fi nishing material similar to varnish. May also be used as a binder. Laminate—A process by which different materials are layered and then bonded together using adhesion. The end result may be the creation of a substrate—such as medium-density overlay (MDO)—or the protection of the underlying surface, as when a clear, plastic fi lm is laminated to a decorated surface. LAN—(local area network) A network of computers sharing a single server or servers in a single location, typically in an offi ce or building. See also WAN. Laser—An intense light beam with a very narrow band width, used in engraving and other cutting equipment. Laser Engraver—Device using a directed, amplifi ed beam of light to cut and mark material. Laser engravers generally use one of two technologies; carbon-dioxide CO2 gas-based or Yttrium Aluminum Garnet (YAG) type lasers. Both will work with a variety of engravables, including glass, acrylic, phenolic and coated metals. YAG lasers can also perform deeper engraving and cutting of metals. The power of a laser engraver is measured in watts. Layout—The total arrangement of a sign's graphic and copy elements. Latex Inks—A new type of water-borne inkjet inks developed by Hewlett-Packard designed for outdoor wide-format printing applications. The inks contain about 70 percent water, 30 percent co-solvents, pigments and latex polymer particles that form a fi lm and bind with substrates with the application of heat. HP has developed a special inkjet printer for these inks. LCD (Liquid Crystal Display)—Thin fl at screen video displays commonly used for TV, computer monitors, wristwatches and electronic digital signage. LCDs contain two thin transparent surfaces (usually glass), with grooves full of a liquid crystal substance. Thin fi lm transistors (TFTs) on the surface material apply an electric current to the liquid crystals. This current polarizes the crystals, making them twist and thus block light. When off, the liquid crystals go into random alignment and let light pass through. LCD Panel—A portable display unit that is placed on top of an overhead projector and connected to a computer so that the computer's display can be projected onto a large screen. Lead-in Wire—The wire that connects an electrode to the power source. LED (Light Emitting Diode)—A semiconductor diode that emits light when voltage is applied; a solid state lighting component, used in signage for EMCs, channel letter illumination, edge lighting glass or acrylic panels or for various decorative lighting effects. Mid-June 2012 77

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