G7 Print Production & Substrate Management Flashcards

In G7 methodology, what is 'ink trap' and why does it matter for color accuracy?

Answer: The percentage of overprinted ink that adheres vs. reflects; affects secondary color accuracy

Ink trap is the percentage of a second-down ink that adheres to a first-down ink, directly affecting the accuracy of overprint colors like red, green, and blue.

What G7 concept describes bringing multiple printing devices to a visually similar gray balance without matching the same absolute density?

Answer: G7 Grayscale harmonization

G7 Grayscale harmonization enables multiple devices to produce visually matching gray balance and tonality even if their absolute ink densities differ.

Which substrate optical brightening agent (OBA) effect must be accounted for when measuring paper white for G7 calibration?

Answer: Fluorescence causing elevated blue channel readings

OBAs in paper fluoresce under UV-containing light, causing inflated blue channel readings that must be compensated using M1 measurement mode per ISO 13655.

What is the recommended maximum dE tolerance for substrate-corrected solid ink patches in G7 Master certification?

Answer: dE 2.0

G7 Master certification requires substrate-corrected solid ink patches to fall within dE 2.0 of the reference characterization data aim points.

What is the purpose of 'substrate correction' when evaluating G7 Targeted compliance?

Answer: Removing the paper white influence so color comparisons are substrate-independent

Substrate correction mathematically removes the paper white's influence from measured color values so that G7 compliance can be evaluated independently of the specific substrate used.

In a G7 workflow, what action should be taken when measured solid ink density exceeds the aim by more than the specified tolerance?

Answer: Adjust ink feed or anilox volume and reprint the calibration target

When solid ink densities are out of tolerance, the correct G7 procedure is to adjust ink delivery (ink feed on offset or anilox on flexo) and reprint the target before continuing calibration.