GMI GMI Color Management & Quality Standards 1 — Questions and Answers
Question 1: Which color model is most commonly used as the standard for print production in the GMI certification framework?
- RGB
- CMYK (Correct answer)
- HSL
- LAB
Correct answer: CMYK
CMYK (Cyan, Magenta, Yellow, Key/Black) is the standard color model for print production because it reflects how inks are mixed on press.
Question 2: What is an ICC profile used for in graphic production workflows?
- Compressing image file sizes
- Defining color behavior of a device or color space (Correct answer)
- Setting print resolution
- Managing font embedding
Correct answer: Defining color behavior of a device or color space
ICC profiles define the color characteristics of a device or color space, enabling consistent color reproduction across different devices.
Question 3: Which instrument is most commonly used to measure color accuracy on printed output in GMI-certified facilities?
- Densitometer
- Spectrophotometer (Correct answer)
- Colorimeter
- Lux meter
Correct answer: Spectrophotometer
A spectrophotometer measures the full spectral reflectance of a color patch, providing the most accurate color data for quality control.
Question 4: In GMI color standards, what does Delta E (ΔE) measure?
- Ink viscosity
- Color difference between two samples (Correct answer)
- Dot gain percentage
- Paper brightness
Correct answer: Color difference between two samples
Delta E quantifies the perceptual difference between two colors, with lower values indicating closer color matches.
Question 5: What is the purpose of a gray balance target in GMI print quality verification?
- To measure ink film thickness
- To verify that CMY overprints produce a neutral gray without color cast (Correct answer)
- To calibrate screen resolution
- To test paper absorbency
Correct answer: To verify that CMY overprints produce a neutral gray without color cast
Gray balance targets confirm that the correct CMY dot values produce a visually neutral gray, ensuring overall color accuracy on press.
Question 6: Which ISO standard is most commonly referenced in GMI color management guidelines for offset lithographic printing?
- ISO 9001
- ISO 12647-2 (Correct answer)
- ISO 27001
- ISO 14001
Correct answer: ISO 12647-2
ISO 12647-2 specifies process control parameters for offset lithographic printing, including ink colors, dot gain, and paper types.
GMI GMI Color Management & Quality Standards 1
Which color model is most commonly used as the standard for print production in the GMI certification framework?