Read more than one colour field
A technical report can list colour primaries, transfer characteristics and other interpretation fields. The ICC’s BT.2020 registry entry identifies a specific set of primaries alongside separate encoding properties. Those are different concepts. Keep the full report when investigating unexpected colours rather than copying only BT.2020 or BT.709 and treating the single label as a complete description of every stage of the picture.
Understand gamut as a colour relationship
The selected primaries define a colour-space framework and its representable gamut. This differs from describing the relationship between encoded signal values and light through transfer characteristics. ITU-R BT.2100 addresses HDR television parameters including PQ and HLG. A wide-gamut claim therefore cannot by itself establish which HDR transfer function is present, whether it is interpreted correctly or how a particular display reproduces it.
Separate signalling from panel capability
A display can accept a signal described within a particular colour framework without physically reproducing every colour that framework can express. Likewise, a format indicator does not measure the mastering quality of the source. Avoid assuming that a television’s notification proves the programme uses the full potential gamut or that choosing a larger-sounding colour-space setting restores detail absent from the original.
Investigate a mismatch deliberately
Record the source’s colour fields, the player/device output and the receiving display mode where available. Compare a lawful known item and change one documented control at a time. Unexpected colour can involve several stages, so retain the initial configuration for a reversible comparison. This reference does not calibrate a television, identify the mastering of a named programme or certify UK IPTV HDR and colour handling on any device.
Questions, answered
Does BT.2020 automatically mean a stream is PQ HDR?
No. Colour primaries/gamut and transfer characteristics are separate fields. Read the complete signal description and the actual playback chain.