chrominance

n. composition of a color in a color signal (as opposed to the composition of brightness or illumination); difference between a color and a reference color that has an equal brightness level (Optics)

Chrominance (chroma for short), is the signal used in many video systems to carry the color information of the picture separately from the accompanying luma signal. Chrominance is usually represented as two color difference components: B'–Y' (blue – luma) and R'–Y' (red – luma). Both of these components have scale factors and offsets applied to them, which differ depending on the video signal scheme in question.
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chrominance
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CROMINANZA [CINEMA]

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