Video Transparencyand Effects7
John Skidgel · 2012
The footage is captured in an NLE, and sent to a compositing program such as 2. After Effects, Fusion, Motion, or Shake. In the compositing application, the green is removed, the remaining edges are softened, and secondary keys or mattes may be created through the use of rotoscoping or garbage mattes. A fi nal matte is created from these efforts and saved with the video footage as a separate channel along- side the video’s three other color (red, green, and blue) channels. What remains of the foreground element may require additional color correction to compensate for color cast (referred to as “spill”) from the background.