Re: Color Measurement
Re: Color Measurement
- Subject: Re: Color Measurement
- From: "Mike Eddington" <email@hidden>
- Date: Wed, 15 Jul 2009 15:58:37 -0400
- Thread-topic: Color Measurement
>>2.increase your tolerances to account for instrument
>>differences, or perhaps use dE2000
>>
>>This should produce no improvement. Changing the metric will
>>not improve the inter-instrument agreement. It would be like
>>changing from an Imperial to a metric tape measure, the units
>>change but the item being measured does not.
>>
Correct, it would not improve instrument agreement per se, but its not
exactly like changing units on a tape measure, where one unit is always
equal to x other units. My contention is that many "measured"
differences in dE76 are less significant perceptually, and since dE2000
more closely correlates with visual perception, differences between to
measurements are often less. So your "inch" (dE76) often looks more like
a "centimeter" (dE2000). Like the examples below:
L* a* b* L* a* b* Delta E Delta E
2000
24.2 -0.55 -2.69 25.3 -0.5 -2.1 1.24924
0.963587877
54.34 -29.52 -48.79 55.3 -30.4 -47.5 1.833058
1.101827061
48.64 65.89 3.22 49.2 65.1 2.5 1.20669
0.668108822
86.38 -3.03 83.52 86.7 -3.5 82.2 1.437254
0.451074496
Mike
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