Omron FQ User Manual page 76

Measurement Data That Can Be Logged (Color Data)
The following values can be logged as measurement data.
Measured item
Color Dif.
7-4 Logging Measurement Data and Image Data: p. 98
Increasing Processing Speed for Color Data
Make the measurement region smaller to reduce the processing time.
Changing the measurement region: p. 57
72
Inspecting with Color Data Inspection Item
Range of value
0 to 442
Description
This is the difference between the color that was registered
as the reference and the measured color. The average color
within the measurement area is used in both cases.
FQ User's Manual