HDR Fundamentals & Core Principles 3

Question 1

What is the key difference between HDR10 and Dolby Vision in terms of metadata?

Accepted Answer

HDR10 uses static metadata; Dolby Vision uses dynamic scene-by-scene or frame-by-frame metadata

Answer

HDR10 relies on static MaxCLL/MaxFALL metadata applied to the entire stream, while Dolby Vision supports dynamic metadata that adjusts tone mapping on a per-scene or per-frame basis.

Question 2

The Perceptual Quantizer (PQ) transfer function was developed to align with which property of human vision?

Accepted Answer

The absolute threshold of luminance discrimination (Barten's CSF model)

Answer

PQ (SMPTE ST 2084) is based on Barten's Contrast Sensitivity Function, encoding values at the threshold of human luminance discrimination to maximize perceptual efficiency.

Question 3

In HDR grading, what is a 'trim pass'?

Accepted Answer

A secondary grade that adapts a master HDR deliverable for a different display target

Answer

A trim pass is a targeted adjustment made to an HDR master to optimize its appearance for a specific display tier (e.g., adapting a 4000-nit master for a 1000-nit consumer TV).

Question 4

Which standard defines the PQ (Perceptual Quantizer) transfer function used in HDR10 and Dolby Vision?

Accepted Answer

SMPTE ST 2084

Answer

SMPTE ST 2084 is the standard that formally specifies the PQ EOTF, supporting peak luminance up to 10,000 nits.

Question 5

What is MaxCLL in HDR10 metadata?

Accepted Answer

Maximum Content Light Level — the highest luminance of any single pixel across the entire content

Answer

MaxCLL (Maximum Content Light Level) specifies the highest luminance value of any single pixel across all frames of the entire HDR content, expressed in nits.

(HDR) High Dynamic Range Certification Practice Test

(HDR) High Dynamic Range Certification Practice Test

HDR Fundamentals & Core Principles 3