2017

Table Of Contents
(a) 255 (White) (b) Output (remapping of luminance values) (c) 0 (Black) (d) 0 (Black) (e) Input (current luminance
values) (f) 255 (White)
In Select edit mode, click a point to display its tangent handle and drag the handle to adjust the curve.
Use other modes in the Tools box (Add Points or Break Tangent, 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.
Warping an Extended Bicubic Surface
Use an extended bicubic surface to warp specific areas of a surface. An extended bicubic surface can be
subdivided into many sections, which are controlled by vertices. The vertices allow you to bend and contort
the surface. The vertices are joined using bicubic interpolationcurved lines.
You can animate the shape of a bicubic surface by changing the position of the vertices and moving the
vertex tangent handles. See
Reshaping Using the Channel Editor (page 511).
By default, the extended bicubic surface has four vertices and eight tangents. You can translate, scale, or
rotate these points and tangents individually or as a group. Subdividing the bicubic surface increases the
number of vertices in the image and allows for more precision.
514 | Chapter 15 Compositing in 3D Space with Action