IHS representation
Some aplications use another color space, based on the Intensity, Hue and Saturation components.
Intensity represents the brightnes of a pixel. Pixels with maximum intensity looks white, while with minumum intensity - black.
Hue represents the "base color" of a pixel. The exact color depends also on saturation and intensity values. For example a fully saturated pixel with red hue will look brown at low intensity. At high intensity level, the same pixel will look pink.
Saturation represents the strength (purity) of the color. Low saturated pixel (at average intensity) look gray as oposed to strong, pure colors of highly saturated pixels.
See the picture on next page for more examples.
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