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What is Chrominance?

Chrominance is the part of a video or image signal that conveys color separately from luma. It is commonly represented by two color-difference components whose interpretation depends on the applicable color standard.

How Chrominance works

Component color systems transform nonlinear RGB values into a luma-like channel and two channels describing departures toward different color axes. This separation permits different bandwidth or sampling treatment for color while retaining more spatial detail in brightness. Chrominance enters capture, codec, and display conversions, where the selected matrix, legal or full range, chroma siting, and color primaries must remain coordinated to reconstruct the intended RGB image.

Key facts

  1. Cb and Cr are scaled, offset digital color-difference values, not universally interchangeable names for analog U and V; their exact coding depends on the governing matrix and range.
  2. Chroma planes may have fewer samples than luma and require reconstruction before RGB conversion. A wrong siting assumption shifts color relative to brightness contours.
  3. In analog composite systems, color information modulates a subcarrier, with phase and amplitude related to hue and saturation; digital component video stores separate sample values instead.

When Chrominance matters

Preserve the correct chrominance range, matrix, and sampling when converting between RGB and Y′CbCr. A mismatch can shift hues, clip saturation, or introduce color bleeding during playback.

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