HDR Color Science & Dynamic Range 2

Question 1

Which transfer function is used by HDR10 to encode luminance values?

Accepted Answer

PQ (Perceptual Quantizer)

Answer

HDR10 uses the PQ transfer function (SMPTE ST 2084), which maps luminance perceptually to encode values up to 10,000 nits.

Question 2

What is the primary advantage of the HLG transfer function over PQ for broadcast applications?

Accepted Answer

Backward compatibility with SDR displays

Answer

HLG is backward compatible with SDR displays because its lower-luminance signal portion follows a conventional gamma curve.

Question 3

In the CIE 1931 color space, what do the x and y coordinates represent?

Accepted Answer

Chromaticity (hue and saturation independent of luminance)

Answer

The x and y coordinates in CIE 1931 represent chromaticity — the hue and colorfulness of a color independent of its luminance.

Question 4

What does the term 'color volume' describe in the context of HDR displays?

Accepted Answer

The combination of color gamut and luminance range a display can reproduce

Answer

Color volume describes the three-dimensional space defined by both the color gamut (chromaticity) and the luminance range a display can produce.

Question 5

Which bit depth is the minimum required for HDR10 content?

Accepted Answer

10-bit

Answer

HDR10 requires a minimum of 10-bit color depth to encode the wide tonal range without visible banding artifacts.

(HDR) High Dynamic Range Certification Practice Test