What does Colour gamut mean?
Colour gamut is the range of colours a system can represent or reproduce under specified conditions. It is separate from the strength of a saturation slider and from the spatial resolution of the picture.
Why it matters
A display with a wide potential gamut still needs to map the source correctly. Forcing all material into an inappropriate colour-space mode can make ordinary faces and grass look exaggerated. HDR and SDR can also use different source conventions and picture modes. A wide-gamut specification alone does not establish colour accuracy, brightness performance or whether the current programme actually uses the additional range.
A practical example
A television can show an intensely coloured demonstration clip while oversaturating a normal studio interview in the same forced mode. Use documented automatic or appropriate source handling and judge several scenes instead of assuming the widest menu label is always the correct choice.
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Related terminology: Colour banding, Colour temperature.
For practical setup and troubleshooting, browse the journal or support guides.