HDR4K

HDR4K refers to video content delivered at 4K resolution with High Dynamic Range. In practice it implies 3840x2160 resolution paired with HDR, which provides brighter highlights, darker shadows, and a wider color gamut. HDR content is typically mastered in 10-bit color and uses color spaces such as P3 or Rec.2020, with metadata controlling how brightness and color are mapped on a display.

Formats and standards: The most common HDR formats are HDR10 (open); HDR10+ (dynamic metadata); Dolby Vision (dynamic metadata, often up to 12-bit); HLG (for broadcast).

Content and distribution: HDR4K material is available on Ultra HD Blu-ray discs and streaming services (Netflix, Prime Video, Disney+). Content must be mastered for HDR and delivered with compatible metadata; devices: 4K HDR TVs, monitors; require HDMI or streaming app on device; bandwidth considerations (HDR metadata adds minor overhead).

Display considerations: To experience HDR, a display should support high peak brightness (often 600-1000 nits) and a wide color gamut; local dimming helps; not all HDR content looks the same across devices. Some older displays may only offer SDR or limited HDR.

Terminology: HDR4K is not a formal standard but a marketing term used to describe 4K content with HDR. Users should check the supported HDR format on a device (HDR10, Dolby Vision, etc.) to ensure compatibility.