Color Science & Image Fidelity Flashcards

What effect does increasing the 'sharpness' control beyond its neutral setting have on video image quality?

Answer: Introduces edge enhancement artifacts and ringing around high-contrast edges

Excessive sharpness applies high-frequency peaking that creates ringing and halo artifacts around edges, degrading rather than improving actual image fidelity.

Which phenomenon causes two surfaces with identical reflectance to appear different in brightness based on their surrounding context?

Answer: Simultaneous contrast

Simultaneous contrast is a perceptual phenomenon where surrounding luminance or color influences the apparent brightness or hue of a target region.

In a properly calibrated display system, what gamma value is targeted for SDR content in a darkened home theater environment?

Answer: 2.4

ISF recommends gamma 2.4 for darkened home theater environments, as the darker surround requires more shadow contrast to maintain perceptually correct image rendering.

What does the Helmholtz-Kohlrausch effect describe in color perception?

Answer: The perceived increase in brightness of highly saturated colors compared to neutral grays of the same luminance

The Helmholtz-Kohlrausch effect describes how saturated colors appear brighter than neutral gray at equal measured luminance levels due to how chroma contributes to perceived brightness.

Which display uniformity issue causes the center of a panel to appear brighter or different in color than the edges?

Answer: Vignetting / luminance non-uniformity

Luminance non-uniformity or vignetting describes uneven light output across the screen surface, often with brighter centers or dim corners in LCD panels.

What is the primary function of a colorimeter versus a spectroradiometer in display measurement?

Answer: Colorimeters use filtered sensors to approximate color values; spectroradiometers measure the full spectral power distribution

Colorimeters approximate XYZ tristimulus values using physical color filters, while spectroradiometers measure the complete spectral power distribution from which exact colorimetric values are calculated.

What does 'post-calibration validation' involve in a professional ISF display calibration workflow?

Answer: Measuring the display against calibration targets after all adjustments to verify accuracy

Post-calibration validation involves taking a full suite of measurements after all adjustments are complete to confirm the display meets target specifications for grayscale, gamma, and color accuracy.