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G

Gamma Correction
A process used with video images to correct brightness and internal micro-contrast within the image. Gamma correction allows a change of ratio between the brightest red component and weakest red

Geo-Demographic Mapping
Method of providing audience specifics as they relate to outdoor locations, both geographically and demographically. Enables plant operators to specify those locations which most efficiently reach target audiences Æ by age, sex, income, brand preference and purchase behavior profiles.

GIF, GIF Image
(jiff) Graphics Interchange Format, a format developed in the mid-1980s by CompuServ to allow network transmission of photo-quality graphics images. Today, the overwhelming majority of images on the World Wide Web are GIF. (The JPG graphics file format is also widely used.) GIF images are 8-bit (256 colors) with a screen resolution of 640X480 pixels. GIF images can be one of two types: GIF87a (the older format) or GIF89a (a newer format which allows transparent backgrounds). GIF images can be either interlaced or non-interlaced. The GIF file format uses a form of file compression known as LZW (Lempel Zev Welch) that squeezes out inefficiencies in the file without causing a loss of data or image quality. Some advantages of GIF over JPG include the fact that they are the most widely supported format on the web, and they can include transparency and interlacing (see JPG).

GPS
Global Positioning System. Highly accurate location system which precisely pinpoints structures in terms of exact latitude and longitude using hand-held instruments that communicate with orbiting satellites.

Gross Impressions
The sum of impressions registered against a target audience based on a GRP level of days or weeks in a schedule.

GRP
Gross Rating Point. Also called TRP (Total Rating Point). The term refers to the total number of impressions delivered by a media schedule expressed as a percentage of a market population. Formerly called showings.

 

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