Quiz 5A - Delta E

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Toronto Metropolitan University *

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360

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Mechanical Engineering

Date

Jan 9, 2024

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pdf

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3

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Quiz 5A - Delta E Q1: Which of the following are advantages of having a numerical method for specification of colour difference? (Select all that apply.) A1: Allows for easy communication of colour difference, Allows for easy setting of pass/fail criterion. Q2: In the class a student measured the following L*a*b values for two colours. Calculate the for these measurements. Sample 1: L* = 35.72, a* = 38.34, b* = 50.08 Sample 2: L* = 40.22, a* = 36.80, b* = 52.31 A2: 5.25 Q3: In the class a student measured the following L*a*b values for two colours. Sample 1: L* = 59, a* = -56.01, b* = -29.22 Sample 2: L* = 58, a* = -52.80, b* = -27.44 A3: The CIEDE2000 for these measurements is 1.33 (Your answer should be rounded to 2 decimal places.) Q4: The following question relates to Match the description to the value.
1 Instrument repeatability 1. 0.1 5 Very poor colour match 2. 1-2 2 Typical tolerance for contract colour proofing 3. 3-6 4 Just noticeable colour difference 4. 1.0 3 Typical colour match in commercial printing 5. 8 Q5: = 2, is considered a just-noticeable colour difference. A5: False Q6: Without measuring, estimate the colour difference of these two blue colours. A6: 2 Q7: What is the CIEDE2000 between the following L*a*b* values? Sample A: 56, -54, -19 Sample B: 52, -52, -23 Q7: 4.50 Q8: In the preceding question you calculated the colour difference between two samples in terms of CIEDE2000. Which of the following best describes their colour difference?
A8: The samples have a colour difference, which may be acceptable depending on the situation. Q9: The human observer is very sensitive to colour differences in which of the following? (Select all that apply.) A9: Large uniform areas, Very saturated colours, Skin tones, Near neutral colours Q10: The best Delta E equation to use today is CIEDE2000. A10: True
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