HDR Imaging Techniques & Technologies 3

Question 1

In HDR photography, what is 'ghost removal' and why is it necessary?

Accepted Answer

Correcting misaligned moving objects between multi-exposure brackets

Answer

Ghost removal algorithms detect and correct objects that moved between bracketed exposures, preventing transparent double-image artifacts in the merged HDR result.

Question 2

Which color space is specifically designed to encompass the full range of human visible colors and is used as a reference in HDR mastering?

Accepted Answer

BT.2020

Answer

BT.2020 (Rec. 2020) defines a very wide color gamut covering approximately 75.8% of the CIE 1931 color space, serving as the standard container for HDR content mastering.

Question 3

What is the function of the OOTF (Opto-Optical Transfer Function) in an HDR system?

Accepted Answer

Converts scene light to display light, accounting for viewing environment

Answer

The OOTF is the end-to-end transfer function that maps scene luminance to display luminance, incorporating the effect of the viewing environment on perceived contrast.

Question 4

In dual-native ISO sensors, how does HDR capture benefit?

Accepted Answer

It allows switching between two sensitivity levels to blend highlights and shadows

Answer

Dual-native ISO sensors blend data from two optimized analog gain stages, capturing clean highlights at low ISO and low-noise shadows at high ISO in a single exposure.

Question 5

What is 'absolute luminance metadata' and how does it help HDR displays?

Accepted Answer

Values specifying the actual cd/m² levels of scene content for display calibration

Answer

Absolute luminance metadata communicates the minimum, maximum, and average light levels of content so HDR displays can render it with accurate brightness and without clipping.

(HDR) High Dynamic Range Certification Practice Test

(HDR) High Dynamic Range Certification Practice Test

HDR Imaging Techniques & Technologies 3