Reading the ΔE Value
You can set the tolerance range for the ΔE calculation, and DeltaMunki will colorize the background of the text field with green or red to make color comparisons quick to comprehend.
When reading the ΔE value, a green background means the value is within the threshold you specified, while a red background means the value is beyond the threshold.
The ΔE calculation yields an absolute value, so the sign will always be positive. If you are only interested in the ΔE value and not the sign of the lightness, chroma or hue values, then either color well may be used for either color (the direction of the calculation is not important in this scenario).
The ΔE value is calculated using the CMC 2:1 method.