G7 Proofing & Contract Proofing 1 — Questions and Answers
Question 1: What is the primary purpose of a contract proof in the G7 workflow?
- To calibrate the inkjet proof printer
- To serve as a binding color reference for production approval (Correct answer)
- To generate ICC characterization data for the press
- To measure the substrate's optical brightener content
Correct answer: To serve as a binding color reference for production approval
A contract proof is the agreed-upon color standard that production printing must match before the job is approved for press.
Question 2: Which international standard defines tolerances for proofing processes working directly from digital data?
- ISO 12647-2
- ISO 12647-7 (Correct answer)
- ISO 3664
- CGATS.17
Correct answer: ISO 12647-7
ISO 12647-7 specifically covers proofing processes working directly from digital data and defines the tolerances for contract digital color proofing.
Question 3: In G7 soft proofing, what is the most critical requirement for accurate color simulation on a display?
- A high-resolution monitor with maximum screen brightness
- A calibrated, profiled display with the correct ICC rendering intent applied (Correct answer)
- A CRT monitor with a wide color gamut
- A display with UV filtering for metamerism correction
Correct answer: A calibrated, profiled display with the correct ICC rendering intent applied
Accurate soft proofing requires a calibrated display with a current ICC profile and the appropriate rendering intent to simulate press output correctly.
Question 4: Which color difference formula is preferred when evaluating G7 proof accuracy against a reference?
- ΔE*ab (CIE76)
- ΔE94
- ΔE00 (CIEDE2000) (Correct answer)
- CMC(1:1)
Correct answer: ΔE00 (CIEDE2000)
ΔE00 (CIEDE2000) is preferred because it is perceptually uniform and correlates better with human visual assessment than earlier formulas.
Question 5: What type of measurement device is required to verify the colorimetric accuracy of a contract proof?
- Reflection densitometer
- Spectrophotometer (Correct answer)
- Colorimeter only
- Photometer
Correct answer: Spectrophotometer
A spectrophotometer measures full spectral data needed to calculate accurate CIELAB values for G7 compliance verification.
Question 6: Which rendering intent is most commonly used when soft proofing a CMYK press profile on a wide-gamut display?
- Absolute Colorimetric
- Relative Colorimetric with black point compensation (Correct answer)
- Perceptual
- Saturation
Correct answer: Relative Colorimetric with black point compensation
Relative Colorimetric with black point compensation maps source colors to the output gamut while preserving neutral gray relationships and shadow detail.
Question 7: A G7 verification print is produced primarily to confirm that:
- The final job is approved for shipping to the client
- The proofing device meets G7 gray balance and tone response tolerances (Correct answer)
- The press operator has signed off on color appearance
- The substrate matches the original purchase specification
Correct answer: The proofing device meets G7 gray balance and tone response tolerances
A G7 verification print is a test print used to confirm that a proofing or printing device meets the G7 NPDC and gray balance standards.
G7 Proofing & Contract Proofing 1
What is the primary purpose of a contract proof in the G7 workflow?