Blending % - Tint Offset dialog box

In the Tint Offset dialog box, use the Blending % slider to adjust the amount of each value you want to add or remove from the palette style.

At 100%, you are adding or removing the full value of each setting. When you change the percentage, you actually change the value of each setting by that percentage. So if you add a Brightness (in HSB) of 50 and you change the blending percentage to 50%, it is the same as changing the Brightness to 25. It is more common to leave the blending percentage at 100% and change the settings for a value.