ISF Display Technologies & Calibration Techniques 5

Question 1

What is 'screen uniformity compensation' (also called 'panel alignment' or 'mura correction') in professional displays?

Accepted Answer

A pixel-level or zone-level correction applied by the display to compensate for inherent manufacturing non-uniformity

Answer

Mura correction applies per-pixel or per-zone luminance and color compensation internally to counteract manufacturing variations in the panel that would otherwise cause visible non-uniformity.

Question 2

Which characteristic of OLED displays makes them particularly well-suited for achieving high native contrast ratios?

Accepted Answer

Their ability to completely turn off individual pixels, producing true black with zero light emission

Answer

OLED pixels are self-emissive and can be individually switched off, producing absolute black (zero emission) and enabling theoretically infinite native contrast ratios.

Question 3

When using a CalMAN or similar calibration software, what does a 3D LUT (Lookup Table) calibration correct that a standard 2-point or 10-point grayscale calibration cannot?

Accepted Answer

It corrects color errors across the entire color volume including mixed color combinations, not just the grayscale axis

Answer

A 3D LUT maps corrections for every combination of R, G, and B values across the full color volume, allowing correction of errors in mixed colors and off-axis hues that grayscale-only calibration cannot address.

Question 4

What is 'response time' in LCD displays and how does it affect video content?

Accepted Answer

The time for a liquid crystal pixel to transition between states, with slow response causing motion blur or ghosting

Answer

LCD response time measures how quickly a pixel transitions between gray levels; slow response causes motion artifacts such as smearing or ghosting, which are most visible in fast-moving video content.

Question 5

In tone mapping for HDR-to-SDR conversion, what is the primary challenge when adapting HDR content for SDR displays?

Accepted Answer

Compressing the wider luminance and color volume of HDR into the smaller SDR range while preserving perceived detail and intent

Answer

HDR-to-SDR tone mapping must compress content mastered for high peak luminance (e.g., 1000–4000 nits) into the SDR range (typically 100 nits) while preserving as much creative intent, highlight detail, and shadow detail as possible.

(ISF) Imaging Science Foundation Certification Practice Test

(ISF) Imaging Science Foundation Certification Practice Test

ISF Display Technologies & Calibration Techniques 5