As the picture above illustrates, the human eye can see a huge variety of colour but the colour pallets for cameras and TVs aren't as advanced and can only render a certain amount of the spectrum Therefore the colours from this gamut spectrum are said to be "out of gamut" and so cannot be shown. As a result black is often used in gamut spectrum's to compensate for the colours that aren't being shown. This "kicks" the hues into darker hues allowing for a more accurate picture that can be labelled full colour.
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