Video color encoding is the set of rules that turns image colors into signal values and tells equipment how to interpret them. It is a bundle of properties—not one setting called “color space”—that commonly includes color primaries, transfer characteristics, and, for Y′CbCr video, matrix coefficients. Quantization range and other format details may also matter.
What does video color encoding describe?
A video signal does not carry colors in the abstract. It carries numbers that must be interpreted according to agreed rules. Those rules describe the colorimetric basis of the image, how light-related values map to encoded values, and how components are represented.
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These properties are often identified through metadata and code points. Production, encoding, distribution, and playback stages use them to interpret or transform the signal. If a stage assumes the wrong properties, the image can be represented or displayed incorrectly. ITU-T H Supplement 19 describes the role of these properties in video and image workflows: ITU-T H Supplement 19 (April 2021).
Which properties make up an encoding?
Color primaries and gamut
Primaries and a white point establish the colorimetric basis of an encoding and the range of colors, or gamut, it can represent. Rec. 709 is a familiar example for HDTV. Its primaries are red (0.640, 0.330), green (0.300, 0.600), and blue (0.150, 0.060), with D65 white at (0.3127, 0.3290). These coordinates describe Rec. 709; they are not universal values for video. The Color.org BT.709 registry identifies ITU-R BT.709-6 as a standard for HDTV production and international programme exchange.
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Transfer characteristics
Transfer characteristics describe how light-related values are mapped to encoded signal values. They are not necessarily the same thing as a display’s decoding behavior. In particular, the Color.org registry says BT.709 specifies an opto-electronic transfer function but does not define the display electro-optical transfer function (EOTF); it points to BT.1886 for display behavior. Treating an encoding transfer function and a display EOTF as interchangeable can therefore lead to a mistaken description of the signal.
Matrix coefficients
When video is represented as Y′CbCr, matrix coefficients describe how nonlinear R′G′B′ signal components are transformed into Y′, Cb, and Cr components. A decoder or conversion must use the matrix associated with the signal; coefficients vary among standards. ITU-T H.273 assigns code points for primaries, transfer characteristics, and matrix coefficients: ITU-T H.273 (July 2024).
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Quantization range
Quantization range describes the numerical range used for signal values. Limited and full range are distinct options, and an RGB or Y′CbCr label alone does not tell you which one applies. The Linux kernel’s V4L colorspace documentation describes limited range as the Rec. 709 default in that context and notes that full range is possible.
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How does Y′CbCr differ from RGB?
R′G′B′ represents the red, green, and blue nonlinear signal components. Y′CbCr represents related information using a matrix transform: Y′ is the luma component, while Cb and Cr carry color-difference components. ITU-T describes Y′CbCr as “commonly used for video/image distribution as a way of encoding RGB information” in H Supplement 19.
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The prime marks matter: R′, G′, B′, and Y′ refer to nonlinear signal components, not linear-light RGB values or physical luminance. Y′ is not necessarily the same as luminance. You may encounter “YUV” used loosely for Y′CbCr, but the terms are not exact synonyms for every digital encoding; the applicable matrix relationship depends on the standard.
What does Rec. 709 specify?
Rec. 709 is a useful example of how several signal properties work together for HDTV. The Linux V4L documentation identifies it as generally used for HDTV and lists its default transfer function, Y′CbCr encoding, and limited-range quantization. For its Rec. 709 Y′CbCr encoding, the luma equation is:
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Y′ = 0.2126R′ + 0.7152G′ + 0.0722B′
The coefficients, transfer description, and range above are Rec. 709-specific. They should not be applied to every video signal. The Color.org registry also makes an important distinction: BT.709 does not define the display EOTF, which it associates with BT.1886.
How to read or compare two video signal descriptions
Compare matching properties rather than relying on a single label such as “color space.” For an end-to-end format comparison, check the applicable format documentation for bit depth and chroma sampling as well as how each property is signaled. Many combinations are theoretically possible, but not all are commonly used.
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- Primaries and white point: Which colorimetric basis and gamut does the signal identify?
- Transfer characteristics: How are light-related values encoded, and what display behavior is specified separately?
- Matrix coefficients: If the signal is Y′CbCr, which conversion from R′G′B′ is identified?
- Quantization range: Is the signal limited-range or full-range?
- Format details: What bit depth and chroma sampling apply, and where are these properties signaled?
Use the signal’s metadata and the relevant format or standard documentation to resolve these details. Do not infer range solely from whether the signal is described as RGB or Y′CbCr.
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