![]() Your eyes will agree with a L*a*b* tolerance pass/fail assessment about 75% of the time. Since the goal is to provide visually pleasing color, most manufacturers want to choose a tolerancing method that most closely agrees with visual assessment. FIGURE 4 DEcmc, DE94, DE2000 tolerancing method.Īligning Your Tolerance with Visual Assessment They are unique because the tolerances change in shape and size based on the color to better agree with human vision. These three elliptical tolerances are progressions in the mathematics and algorithms used to calculate tolerances by measuring the distance between two colors (Figure 4). Consider you are taking a trip from point A to point B. There are different routes you could take – that’s like using L*a*b* or L*C*h°. Delta E* is a measure of the total distance between the two points “as the crow flies.” FIGURE 3 Delta E tolerancing method. If you can plot two colors on a color model, you can calculate the distance between them (the Delta) and select a range of acceptable color (the tolerance), similar to calculating the distance between two cities on a map.ĭelta E is spherical tolerance that uses a single number to measure the difference between two colors (Figure 3). This more closely matches human perception of color, which reduces the chance of disagreement between human observer and instrument readings or values. Using the L*C*hº polar coordinate system to set up tolerancing allows a tolerance box to be rotated in orientation to the hue angle.
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