HDR Standards & Formats 5

Question 1

What minimum peak brightness must a display achieve to earn the UHD Alliance's 'ULTRA HD PREMIUM' certification for HDR?

Accepted Answer

400 nits with less than 0.05 nits black level, OR 1,000 nits with less than 0.0005 nits black level

Answer

ULTRA HD PREMIUM defines two luminance tiers to accommodate both LCD and OLED: 1,000 nits peak/0.0005 nits black, or 540 nits peak/0.0005 nits black for certain panel types.

Question 2

In the SMPTE ST 2094 family of standards, what does each 'application' (App 1, App 4, etc.) correspond to?

Accepted Answer

Different proprietary dynamic metadata systems from various companies

Answer

SMPTE ST 2094 is an umbrella standard where each Application specifies a distinct dynamic metadata ecosystem—App 1 is Dolby, App 4 is HDR10+, etc.

Question 3

Which color subsampling scheme does HDR10 specify for broadcast and disc delivery?

Accepted Answer

4:2:0

Answer

HDR10 on Ultra HD Blu-ray and most streaming services uses 4:2:0 chroma subsampling, consistent with HEVC compression efficiency goals.

Question 4

When a Dolby Vision-capable TV receives an HDR10 signal, what typically happens?

Accepted Answer

The TV falls back to HDR10 tone mapping since Dolby Vision is backward-compatible with HDR10

Answer

Dolby Vision dual-layer streams embed an HDR10-compatible base layer, so a Dolby Vision display renders HDR10 correctly when a Dolby Vision layer is absent.

Question 5

For over-the-air (OTA) broadcast in the United States, which HDR format has been selected by ATSC 3.0 (NextGen TV) as a supported standard?

Accepted Answer

HDR10 and HLG

Answer

ATSC 3.0 supports both HDR10 and HLG, giving broadcasters flexibility to deliver absolute-luminance HDR or the backward-compatible hybrid format.

(HDR) High Dynamic Range Certification Practice Test

(HDR) High Dynamic Range Certification Practice Test

HDR Standards & Formats 5