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Glossary
Term Description
Gamma
Correction
Adjustment to gamma or how gray levels between black and white are displayed as the eye is
sensitive to these in a logarithmic manner. For example, good gamma correction allows subtle
shadow detail in a dark image to be easily perceived.
Gauge Wire thickness measure. The lower the gauge, the larger the wire.
Geometry Characteristic of a display to accurately show an image without distorting it. When a display’s
geometry is good, it represents square objects as a square, etc. See pincushioning and barrel
distortion.
Geometry
Correction
Geometry Correction (sometimes referred to as Image Warping) is the process of digitally distorting a
projected image so that it precisely matches a specific projection surface or shape. Image geometry
correction compensates for the distortion created by off-axis projector or screen placement or non-
flat screen surface, by applying a pre-compensating inverse distortion to that image in the digital
domain.
Ghosting A faint duplicate image, usually offset from primary image. Can be caused by multipath, which is a
delayed, attenuated duplicate signal bounced off an object to an antenna or other interference.
Gray Scale A table of shading devoid of colour, progressing from black to white. The number of discernible gray
levels defines the colour resolution of the display device and is used to evaluate colour acuity and
contrast.
HDBaseT
®
HDBaseT
®
is an international standard for the transmission of ultra-high-definition video & audio,
Ethernet, controls, USB and up to 100W of power over a single cable, for up to 100 meters. HDBaseT
®
eliminates cable clutter without compromising performance and high quality. The connector is
typically a RJ48 8 pin Ethernet jack.
HDCP HDCP (High-bandwidth Digital Content Protection) is a method for protecting copyrighted digital
content that uses the DVI (Digital Visual Interface) or HDMI

(High-Definition Multimedia Interface,
previously known as DVI-CE) by encrypting its transmission between the video source such as a
set-top box, DVD player, or computer and the digital display device such as a projector, monitor or
television. To view digital HDCP protected content, both the sending and receiving device must
support HDCP.
HDMI

HDMI

(High Definition Multimedia Interface) is an uncompressed, all-digital audio/video interface
that supports audio/video sources such as a set-top box, DVD player, A/V receiver, and video
monitors such as a digital projector or digital television (DTV). HDMI

is backward compatiable with
DVI 1.0 specification and supports HDCP.
HDMI

supports standard, enhanced, or high-definition video, plus multi-channel digital audio, and
interactive controls on a single cable. It transmits all ATSC (Advanced Television Systems Committe)
HDTV standards and supports 8-channel digital audio. First product releases using HDMI

occurred
in 2003.
HDR High Dynamic Range (HDR) yields higher overall contrast than Standard Dynamic Range (SDR).
Deeper blacks and brighter highlights result in a longer tonal scale that can render detail in shadows
and highlights that tends to get lost in SDR. HDR systems generally come with wider colour gamuts
for greater potential colour accuracy.
HDTV High-Definition Television. Generic term that indicates a higher resolution format than previous
standards. At present, denotes anything higher than a 480p signal. Most common formats are 720p,
1080i and 1080p.
HDTV capable A television that supports 720p or 1080i or higher resolutions and has a built-in HDTV tuner for off-
air reception of HD signals from a special antenna. To view cable and satellite HDTV programming, a
cable set-top-box or satellite receiver is required.
Glossary