The spec for javax.swing.plaf.nimbus.NimbusLookAndFeel.getDerivedColor(Color color1, Color color2, float midPoint) says:

     * @param midPoint The offset between color 1 and color 2, a value of 0.0 is
     *                 color 1 and 1.0 is color 2;

Exact second color is not always returned for 1.0 offset value.

Please see the following code sample:

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import java.awt.*;

public class Test {
    public static void main(String[] args) {
        class MyNibusLAF extends javax.swing.plaf.nimbus.NimbusLookAndFeel {
            public Color callGetDerivedColor(Color c1, Color c2, float midPoint) {
                return getDerivedColor(c1, c2, midPoint);
            }
        }
        Color secondColor = Color.BLACK;
        Color returnedColor = new MyNibusLAF().callGetDerivedColor(Color.WHITE, secondColor, 1.f);
        System.out.println("returnedColor = " + returnedColor);
        System.out.println("secondColor = " + secondColor);
    }
}
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Output will look:

returnedColor = javax.swing.plaf.ColorUIResource[r=1,g=1,b=1]
secondColor = java.awt.Color[r=0,g=0,b=0]


Color RGB components are not as expected.