Mixed Deck — All DIS Topics Flashcards

Which correlation coefficient is most appropriate for measuring the monotonic relationship between ranked image quality scores from two different evaluators?

Answer: Spearman ρ (rho)

Spearman's ρ measures the strength and direction of monotonic relationships using ranked data, making it appropriate for ordinal quality scores.

What is the role of a color proof in the prepress production workflow?

Answer: Providing a reference sample that simulates the expected print result for approval before committing to a press run

A color proof—whether a contract hard proof or a certified soft proof—gives designers and clients a reliable preview of the finished print so corrections can be made before expensive press time begins.

A DIS professional is designing a backup strategy for a 20TB digital archive. Which backup approach minimizes daily backup window while ensuring full recoverability?

Answer: Weekly full + daily incremental backups

Weekly full plus daily incremental backups minimize the daily backup window by only capturing changes since the last backup, while enabling full recovery.

What is the significance of checking for 'clipping' in a digitized image during QA?

Answer: Clipping means highlight or shadow detail is lost because tonal values exceeded the sensor's range, reducing image quality

Highlight clipping (pure white) or shadow clipping (pure black) means tonal detail is irretrievably lost, which is a critical quality defect in archival digitization.

A 'luminosity mask' in advanced compositing selects pixels based on:

Answer: Their brightness values relative to the tonal range

Luminosity masks create selections weighted by pixel brightness, allowing edits to be applied with natural feathering that respects the tonal values in the image.

What does GCR (Gray Component Replacement) accomplish in prepress color preparation?

Answer: Replacing equal CMY components that form neutral tones with black ink to reduce total ink coverage

GCR substitutes the equal amounts of cyan, magenta, and yellow that combine to make neutral grays with black ink, lowering total ink coverage, improving press stability, and reducing ink cost.

When designing a digital imaging workflow for a newspaper with strict 30-minute deadlines, which system architecture consideration is most critical?

Answer: End-to-end latency and fault tolerance

In time-critical workflows, minimizing end-to-end latency and ensuring fault tolerance are paramount so deadlines are met even during component failures.

In a content delivery architecture for digital images, which caching strategy minimizes origin server load while ensuring users always receive the most current version of frequently updated images?

Answer: Cache with short TTL and stale-while-revalidate

Short TTL with stale-while-revalidate serves cached content immediately while refreshing in the background, balancing freshness and performance.

Why is calibration important in image capture systems?

Answer: To align the capture device for accurate results

Calibration in image capture systems is essential to ensure that the device produces accurate and consistent results. It involves adjusting the device's settings to a known standard, correcting for any color shifts, distortions, or inconsistencies. This process ensures that captured images faithfully represent the original scene or document.

When dodging and burning for portrait retouching, working on a gray-filled layer set to which blend mode allows non-destructive tonal painting?

Answer: Overlay

Overlay mode causes 50% gray to have no effect, while painting lighter grays dodges and darker grays burns, enabling non-destructive dodge-and-burn on a separate layer.

Which white point is standard for sRGB and most web display work?

Answer: D65

sRGB is defined with a D65 (6500K) white point, which matches typical daylight viewing conditions for consumer monitors.

Which of the following describes 'exposure bracketing' in digital capture?

Answer: Capturing a series of frames at different exposure values around the metered exposure

Exposure bracketing shoots 3 or more frames at predetermined EV intervals (e.g., -1, 0, +1) to ensure at least one optimal exposure or to enable HDR merging.

What is the main advantage of using lossless LZW compression when saving a TIFF file for archiving?

Answer: It reduces file size without any loss of image data

LZW is a lossless algorithm—every pixel value is preserved exactly, so the archived file is bit-for-bit identical to the original when decompressed.

What is the triple constraint in DIS project management?

Answer: The interdependent relationship between scope, time, and cost

Scope, time, and cost are interdependent: changing one affects the others. Managers must balance all three.

Which characteristic most precisely defines the PDF/X-1a specification?

Answer: All colors must be in CMYK or spot color only; no RGB, Lab, or device-independent color spaces are permitted

PDF/X-1a mandates that all colors be defined in CMYK or spot, fonts be fully embedded, and live transparency be flattened, making files fully self-contained and predictable for offset press output.

A DIS database administrator needs to grant a reporting user read-only access to the images table without write privileges. Which SQL statement is correct?

Answer: GRANT SELECT ON images TO reporter

GRANT SELECT restricts the user to read-only access without allowing INSERT, UPDATE, or DELETE operations.

In Continuous Integration (CI) for an imaging pipeline, what action triggers an automated build and test run?

Answer: A developer commits code to the shared repository

CI systems monitor the shared repository and automatically build and test the project whenever a developer pushes a commit.

In a RAW file workflow, which step converts linear light data captured by the sensor into a perceptually uniform image?

Answer: Gamma encoding / tone curve application

Gamma encoding (e.g., applying a gamma of ~2.2) redistributes linear sensor data so that midtone gradations appear visually smooth to human perception.

Which PostgreSQL feature allows querying image metadata stored as JSON without extracting it into separate columns?

Answer: JSONB operators

PostgreSQL's JSONB operators like -> and ->> allow direct querying of JSON fields without restructuring the schema.

A DIS candidate is reviewing a project charter for an imaging center buildout. The project charter primarily serves to:

Answer: Formally authorize the project and name the project manager

The project charter formally authorizes the project's existence and grants the project manager authority to apply resources.