You can access the ICC Pure Hues dialog (Figure 2) by clicking the Color button (the button with nine colored squares) next to each profile option. Pure Hues applies the selected profile to all colors except those colors with a check next to them.
NOTE: Pure Hues options only affect colors that are 100% of that specific color. For example, using Pure Hues with 100% yellow will preserve any pure yellow in your image. However, a color made up of yellow, cyan, and black will not be affected by the Pure Hues options.