HDR Assessment & Evaluation Techniques 3

Question 1

When evaluating HDR content for tone mapping performance, which transition zone is most critical to assess for banding artifacts?

Accepted Answer

Midtone-to-highlight transition

Answer

Banding artifacts most commonly appear in the midtone-to-highlight transition where tone mapping curves compress a wide luminance range into fewer code values.

Question 2

A Dolby Vision evaluation requires a 'trim pass' adjustment. What does this process specifically address?

Accepted Answer

Optimizing HDR content appearance for displays with different peak luminance capabilities

Answer

A Dolby Vision trim pass fine-tunes how the dynamic metadata maps content to displays of varying peak luminance, ensuring good appearance across all target devices.

Question 3

What is the recommended black level (minimum luminance) for a reference HDR mastering monitor per industry standards?

Accepted Answer

0.0005 cd/m²

Answer

ITU-R BT.2100 and related mastering standards target a minimum luminance of 0.0005 cd/m² (0.5 millinits) for reference HDR monitors to accurately represent deep blacks.

Question 4

In HDR signal chain verification, what does an incorrect EOTF flag in the video stream cause on a consumer HDR display?

Accepted Answer

The display renders content with wrong brightness, appearing either washed out or crushed

Answer

An incorrect EOTF flag causes the display to apply the wrong inverse transfer function, resulting in badly exposed images that appear either too bright or too dark.

Question 5

When assessing HDR content for OTT delivery, what is the primary concern with using MaxCLL values that are too conservative (too low)?

Accepted Answer

Display devices may unnecessarily limit peak brightness, reducing the HDR impact

Answer

If MaxCLL is set lower than the actual content peak, some displays will cap their peak brightness unnecessarily, reducing the intended HDR viewing experience.

(HDR) High Dynamic Range Certification Practice Test

(HDR) High Dynamic Range Certification Practice Test

HDR Assessment & Evaluation Techniques 3