Compositing in 3D Space with Action > About Surfaces > Blending Curves >

# Applying Blending Curves per Surface

To adjust the blending curve:

1. In the Surface menu, click the Blending tab.

   The Blending Curve menu appears.

   (a) Front matte curve(b) Back matte curve(c) Matte box(d) Blend Curves option box(e) Keyframe option box (f) Reset Selection box

2. Select Result view from the View box. This allows you to view a particular image as you adjust the curve.
3. To adjust the luminance curve for the front matte, select Front from the Matte box. To adjust the back matte curve, select Back. Alternatively, click a curve to select it.

   (a) 255 (White)(b) Output (remapping of luminance values)(c) 0 (Black)(d) 0 (Black)(e) Input (current luminance values)(f) 255 (White)

   In Move edit mode, click a point to display its tangent handle and drag the handle to adjust the curve. Use other modes in the Edit Mode box (Add, Delete, or Break, for example) to further adjust the curve, adding or deleting points, or breaking tangent handles as needed.

4. Use the options in the Keyframe option box to Set, Delete, or Reset keyframes. If Auto Key is enabled, a keyframe is added automatically when you adjust the blending curve.
5. Use the Blend Curves option box to switch between the surface blend curves and the keyer blend curves. This gives you a good comparison to luminance curve work you have already done in the Keyer. When Use Keyer Blend Curves is selected, all of the other Action blend curve settings are unavailable.