You can modify the hue, saturation, and lightness curves that appear in the Curves menu. You can modify the entire curve uniformly or modify individual vertices for RGBCMY channels (red, green, blue, cyan, magenta, and yellow). You must toggle between controls that modify the position of the red, green, and blue vertices and those that modify the position of the cyan, magenta, and yellow vertices.

To modify hue, saturation, and lightness curves:

1. Enable HueCrv to access controls for the red, green, and blue vertices.

   
   

2. Use the following controls to modify the hue, saturation, and lightness curve at each displayed vertex.

   
   

3. Press HueCrv again to access controls for the cyan, magenta, and yellow vertices, and then modify the curves.