Monitoring & Reporting Tools Flashcards

Which device measures the optical density of ink on a printed substrate?

Answer: Densitometer

A densitometer measures optical density by quantifying the amount of light absorbed by printed ink.

In GMI certification, what does a 'press fingerprint' report establish?

Answer: Baseline color and tone reproduction characteristics of a specific press

A press fingerprint documents the baseline tone reproduction curves, dot gain, and color output specific to that press under standard conditions.

What is the purpose of a control strip on a printed press sheet?

Answer: To provide measurable targets for monitoring ink density and dot gain

Control strips contain standardized patches that allow quality technicians to measure and monitor ink density, dot gain, and color accuracy across a press run.

Which ISO standard specifically addresses measurement and calculation of print quality attributes in offset lithography?

Answer: ISO 12647-2

ISO 12647-2 defines process parameters for offset lithographic printing, including ink density, dot gain, and color tolerances.

In a monitoring report, a Delta E (ΔE) value is used to express what?

Answer: Color difference between a measured value and a reference target

Delta E quantifies the perceptual difference between two colors, with lower values indicating closer agreement to the target.

What does 'dot gain' refer to in print quality monitoring?

Answer: The increase in halftone dot size from file to printed output

Dot gain is the phenomenon where halftone dots print larger than their digital specification, affecting tonal reproduction.

Which reporting metric best indicates whether a press is maintaining consistent ink density throughout a long press run?

Answer: Standard deviation of density measurements across multiple pull points

Standard deviation of density readings taken at intervals across a run reveals how consistently the press maintains target density.