| http://www.w3.org/ns/prov#value | - To prevent a magenta line from being detected erroneously as noise, the difference between the maximum value in lightness (255) and one of the values in lightness output from the line sensors other than line sensor 213G, i.e., line sensors 213R and 213B, reading a color complementary to green, or magenta, can be set as Ref2(R), Ref2(B).
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