|
Delta-E Explained
Delta-E is used to describe (mathmatically) the distance between two colors. To calculate the delta-E of any two colors, you need to know their LAB values. Once you have these values, all that you need to do to calculate delta-E is to calculate the distance between the two points in the Lab color space.
The average, casual viewer can notice the difference between two colors that are 5-6 delta-E apart. A trained eye is capable of differentiating two colors that are closer to 3-4 delta-E apart. However, the human eye is very sensitive to changes away from achromatic tones (a and b values near 0)--in this case, you can often notice a difference between two 'shifted' grays that are as close as .5 delta-E apart. Tolerances of less than 2 delta units are typically unachievable given normal process variation.
|
