G7 Proofing & Contract Proofing 2 — Questions and Answers
Question 1: What is the minimum bit depth recommended for a display used in professional G7 soft proofing?
- 6-bit
- 8-bit
- 10-bit (Correct answer)
- 12-bit
Correct answer: 10-bit
A 10-bit display is recommended for soft proofing because it provides smoother gradients and reduces banding in shadow and highlight areas.
Question 2: In soft proofing software, enabling 'Simulate Paper Color' achieves what primary effect?
- Adds a paper texture overlay to the on-screen image
- Simulates the white point and optical brightener effect of the target substrate (Correct answer)
- Maps all white values to the D50 standard illuminant
- Increases display luminance to match press ink reflectance
Correct answer: Simulates the white point and optical brightener effect of the target substrate
Simulate Paper Color uses the ICC profile's media white point to show how the substrate's color, including optical brighteners, will affect final print appearance.
Question 3: Which standard defines the viewing conditions used when evaluating proofs and printed samples in graphic arts?
- ISO 3664 (Correct answer)
- ISO 12647-2
- CGATS.5
- DIN 16536
Correct answer: ISO 3664
ISO 3664 specifies graphic technology viewing conditions, including D50 illumination at 2000 lux for critical comparison of proofs and prints.
Question 4: What is the purpose of measuring an IT8.7/4 target on a proofing device?
- To measure press halftone dot gain
- To characterize the proofer's full color response and build an accurate ICC output profile (Correct answer)
- To calibrate the spectrophotometer before use
- To set up G7 press transfer curves
Correct answer: To characterize the proofer's full color response and build an accurate ICC output profile
The IT8.7/4 characterization target provides comprehensive patch data needed to build an accurate ICC profile describing the proofing device's color output.
Question 5: A G7-compliant proof must primarily demonstrate correct:
- Maximum ink density on solid CMYK patches
- Neutral gray balance and Neutral Print Density Curve (NPDC) conformance (Correct answer)
- Exact Pantone spot color matching for all jobs
- Minimum dot gain values across all ink channels
Correct answer: Neutral gray balance and Neutral Print Density Curve (NPDC) conformance
G7's defining requirement is accurate neutral gray balance and NPDC conformance, which ensures predictable tone and color across different printing systems.
Question 6: When building a proof ICC profile, black point compensation (BPC) primarily affects:
- The maximum ink coverage allowed on the proofing device
- How shadow detail is mapped from the source color space to the proofer's gamut (Correct answer)
- The luminance of highlight patches on the proof
- The rendering of spot colors in the output
Correct answer: How shadow detail is mapped from the source color space to the proofer's gamut
Black point compensation scales source shadow detail to the output device's darkest reproducible point, preserving shadow detail when gamuts differ.
Question 7: During soft proofing, an out-of-gamut warning indicates that:
- The display ICC profile has become outdated and needs recalibration
- Colors in the source document cannot be reproduced by the simulated output device (Correct answer)
- The rendering intent is incorrectly set to Perceptual instead of Relative Colorimetric
- The monitor's calibration has drifted from its target white point
Correct answer: Colors in the source document cannot be reproduced by the simulated output device
Out-of-gamut warnings flag colors in the source that fall outside the reproducible color range of the target output device being simulated.
G7 Proofing & Contract Proofing 2
What is the minimum bit depth recommended for a display used in professional G7 soft proofing?