What does Chroma mean?
Chroma carries colour-related information in video systems that separate it from a brightness-related component. It helps represent how colours differ while allowing the encoder to allocate detail differently across components.
Why it matters
Chroma is not a synonym for saturation, colour gamut or HDR. Many video formats reduce chroma sampling resolution to save data while retaining more brightness structure. This can be hard to notice in natural scenes but visible around fine coloured text or graphics. An output conversion cannot recreate colour samples removed earlier in the source encoding.
A practical example
A tiny red caption on a blue background may look less crisp than white text of the same size. Selecting a 4:4:4 output can avoid an additional reduction on a supported desktop path, but it cannot restore chroma detail already absent from the incoming stream.
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Related terminology: Children’s channel, Chroma subsampling.
For practical setup and troubleshooting, browse the journal or support guides.