1. Click the desired color channel.
  2. Do the following:
  3. Click the point on the curve that you want to adjust, or type the value in the Tint In box.
  4. You can also click a point that you want to adjust and then click two anchor points on either side of the point to constrain a range of your adjustment. The curve will not be affected at tint values outside of these anchor points. 


  5. Drag the adjustment point up to darken the output or drag it down to lighten the output, or type a value in the Tint Out/Tint Change box.
    Your adjustment may be restricted in order to keep the curves monotonically increasing.