Ask which HDR description applies
ITU-R BT.2100 describes HDR television parameters using PQ and HLG methods. These names concern how the signal represents image information; they do not tell you that every player or television supports every combination. The current recommendation’s version should be checked when making a technical reference. A broad HDR badge alone leaves important details unanswered about the actual content and display arrangement.
Keep format and resolution separate
The number of picture pixels and the HDR signal description are different properties. Neither a 4K device label nor a bright-looking promotional image establishes that the current programme is being delivered and displayed in the intended HDR form. Record what the legitimate player and display report for the actual sample. Avoid diagnosing solely from a screenshot, because the capture and viewing screen may not represent the original signal faithfully.
Describe the whole output chain
Include the source application, device, television and any receiver or switch. A mismatch can involve more than the final display. Check the manufacturers’ supported formats and applicable input settings rather than forcing a generic enhancement setting across every programme. Keep a reversible record of changes and compare the same authorised sample. A vivid setting that you prefer is not proof of technically correct HDR interpretation.
Use a careful support comparison
Describe whether the concern is washed-out colour, unusual brightness, a missing HDR indication or a failure to play. These are different observations. Where suitable reference material is available, compare it through a supported path and record the result. The standard provides vocabulary for a precise discussion; it does not verify a service’s source resolution, promise universal native 8K or establish that a particular player has been tested with UK IPTV.
Questions, answered
Does a 4K logo prove the programme is being displayed in HLG or PQ?
No. Resolution and HDR interpretation are separate. Check the actual source and the supported display chain rather than using a hardware or promotional logo as evidence of the current output.