GMI Implementation & Configuration 3 — Questions and Answers
Question 1: When building a custom press ICC profile for GMI certification, what is the minimum recommended number of color patches in the measurement target?
- 64
- 128
- 288 (Correct answer)
- 918
Correct answer: 288
A minimum of 288 patches (such as the IT8.7/4 target) is generally recommended to build a robust press ICC profile for certification purposes.
Question 2: A technician is configuring dot gain compensation curves in a RIP. Which curve adjustment would INCREASE the physical dot size on press?
- Raising the midtone value in the compensation curve
- Lowering the midtone value in the compensation curve (Correct answer)
- Setting the highlight value to 0%
- Setting the shadow value to 100%
Correct answer: Lowering the midtone value in the compensation curve
Lowering the midtone compensation value sends less ink signal, meaning the RIP compensates less, which results in more physical dot gain and larger dots on press.
Question 3: In a GMI-compliant facility, which document formally defines the acceptable process parameters and measurement tolerances for each substrate and press combination?
- Control chart
- Press fingerprint report
- Press characterization data set
- Process control plan (Correct answer)
Correct answer: Process control plan
The process control plan is the governing document that specifies acceptable parameters, measurement tolerances, and corrective action triggers for each press-substrate combination.
Question 4: When configuring measurement intervals for a SPC (Statistical Process Control) system on press, what does a control chart's UCL represent?
- The target value for the measured parameter
- The upper boundary beyond which the process is considered out of control (Correct answer)
- The maximum allowable deviation from the ISO standard
- The highest measurement recorded during press fingerprinting
Correct answer: The upper boundary beyond which the process is considered out of control
The Upper Control Limit (UCL) is the statistical boundary above which a process is considered out of statistical control and corrective action should be taken.
Question 5: Which configuration setting in a color server directly controls how out-of-gamut spot colors are mapped when converting to process inks?
- Black generation setting
- Rendering intent for spot color conversion (Correct answer)
- Total area coverage limit
- Dot gain compensation curve
Correct answer: Rendering intent for spot color conversion
The rendering intent applied to spot color conversions determines how out-of-gamut spot colors are handled when converting to CMYK process inks.
Question 6: During GMI implementation, the 'fingerprint' press run is used to establish what?
- The maximum press speed for production jobs
- The baseline colorimetric behavior of the press under defined conditions (Correct answer)
- The operator's proficiency with press controls
- The substrate's ink absorption rate
Correct answer: The baseline colorimetric behavior of the press under defined conditions
A fingerprint press run captures the baseline colorimetric behavior of a specific press under defined, stable conditions to serve as the reference for profiling and calibration.
Question 7: When implementing GMI color standards, which ISO standard defines the reference printing conditions for commercial offset lithography?
- ISO 9001
- ISO 12647-2 (Correct answer)
- ISO 15076
- ISO 13655
Correct answer: ISO 12647-2
ISO 12647-2 defines the process parameters and tolerances for offset lithographic printing, including the reference printing conditions used in GMI implementation.
GMI Implementation & Configuration 3
When building a custom press ICC profile for GMI certification, what is the minimum recommended number of color patches in the measurement target?