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The brightness of a plasma screen television is often touted as one of its greatest selling points. Technically, brightness in televisions is often discussed using the term “contrast ratio”. The contrast ratio is a measure of a television's ability to display very bright objects and very dark objects simultaneously. Plasma screen televisions are able to display very high contrast ratios at uniform amounts of brightest, creating a very detailed picture that is not overly garish. Normal CRT televisions often loose brightness with age, or produce images with varying levels of brightness, with darkening at the edges, and overly bright “hot spots” near the center.