HDR Calibration & Display Measurement 3

Question 1

What surround luminance does ITU-R BT.2100 recommend for a professional HDR grading environment?

Accepted Answer

5 cd/m²

Answer

ITU-R BT.2100 recommends a surround luminance of approximately 5 cd/m² for professional HDR viewing environments to minimize eye adaptation issues while avoiding full darkness.

Question 2

What is the function of a 3D Look-Up Table (3D LUT) in HDR display calibration?

Accepted Answer

To map input color values to corrected output values across the full three-dimensional color space

Answer

A 3D LUT stores a three-dimensional mapping of input RGB values to corrected output values, enabling precise compensation for display inaccuracies across the entire color volume simultaneously.

Question 3

Which HDR format uses the scene-referred Hybrid Log-Gamma (HLG) transfer function rather than the PQ curve?

Accepted Answer

HLG as defined in ITU-R BT.2100

Answer

HLG (Hybrid Log-Gamma), standardized in ITU-R BT.2100, uses a scene-referred transfer function combining a logarithmic curve for highlights with a gamma curve for shadows, enabling backward compatibility with SDR displays.

Question 4

What does a delta-E (ΔE) value quantify in the context of display calibration?

Accepted Answer

The perceptual color difference between a target color and a measured color

Answer

Delta-E (ΔE) quantifies the perceptual difference between two colors; a value below 1.0 is generally considered imperceptible to the human eye, making it a key calibration accuracy metric.

Question 5

What is the primary role of display calibration software such as CalMAN or LightSpace in an HDR post-production workflow?

Accepted Answer

To automatically measure display performance, analyze deviations, and generate correction profiles such as 3D LUTs

Answer

Calibration software like CalMAN or LightSpace automates the measurement of display performance against calibration targets and generates correction profiles (such as 3D LUTs) to achieve accurate, verifiable color reproduction.

(HDR) High Dynamic Range Certification Practice Test

(HDR) High Dynamic Range Certification Practice Test

HDR Calibration & Display Measurement 3