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What is a Video Color Space?

A video color space defines how numeric samples represent color through primaries, transfer characteristics, matrix coefficients, and range. Correct interpretation is required to reproduce the intended colors and brightness.

How Video Color Spaces work

Color reproduction depends on a coordinated set of parameters rather than a single label. Primaries locate the reference colors, a transfer function maps signal values to light, matrix coefficients relate luma and chroma, and range defines code-value usage. Decoders use these declarations before display conversion or tone mapping. This information must survive capture, editing, compositing, encoding, and packaging because a numerically valid frame can still be interpreted with the wrong appearance.

Key facts

  1. A codec name and pixel format do not completely identify color: two streams with the same bit depth and chroma layout can require different primaries or transfer functions.
  2. Interpreting limited-range luma as full range raises blacks and lowers whites, while the inverse interpretation can crush shadows and clip highlights.
  3. An HDR-to-SDR conversion requires coordinated tone and gamut mapping; changing only the metadata tags does not transform the stored sample values into an SDR image.

When Video Color Spaces matter

Preserve or deliberately convert color-space metadata when mixing sources or moving between SDR and HDR. A missing or incorrect tag can cause washed-out contrast, clipped highlights, or shifted colors.

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