Improving a video image by boosting high frequency or other signals which are usually lost during recording. There are several types of enhancing. Luminance enhancing takes place mainly in the border areas between light and dark images. The transitions (edges) between the light and dark areas are extenuated. When there is a light area on the screen located on a dark background, the edge of the left part of the area becomes lighter and the right side becomes darker. In double-edge enhancing, all the edges surrounding the area become enhanced and the enhanced area itself appears, in effect, three-dimensional. Chrominance enhancing improves color saturation and restores normal hue.
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