Heightens contrast by using Multiply mode on darker colors and Screen mode on lighter colors.Īdds overlay colors as if the overlay were lit by a bright, focused spotlight.īrightens the background based on the overlay color values.ĭarkens the background based on the overlay color values.Ĭompares the overlay and background pixel by pixel and selects the darker color value for each pixel.Ĭompares the overlay and background pixel by pixel and selects the lighter color value for each pixel.Ĭompares the overlay and background pixel by pixel and subtracts the darker color value from the lighter color to generate a new color value. This makes overlay colors weaker and less present and results in a lighter video image. Multiplies the inverse of the overlay color values with the background color values. Subtracts the overlay color values from the background.Ĭuts out the overlay color values from the background. If no alpha channel is present, the Source Alpha mode has no effect.Ĭombines the color values in the composite group.

The compositing mode is based on the alpha channel characteristics of an event or media file. Uses the alpha channel to determine transparency. Track one is a generated media event with a transparent edge, and track two is a DV clip. The following examples demonstrate how each of the compositing modes would affect two simple tracks. The mode can be selected by clicking the Compositing Mode button and choosing a mode from the menu. The compositing mode of the lowest video track adjusts its transparency against the background. Since lower tracks show through higher tracks, it is the compositing mode of the higher track that determines how much of the lower track shows though. The Compositing Mode button determines how the transparency in a video track is generated. Hold Ctrl while clicking the Make Compositing Child button to move a track and all its child tracks in one level.įor examples of how parent/child track relationships affect 3D compositing, click here.

When you have multiple levels of parent and child tracks, clicking the Make Compositing Child button moves the track in one level and clicking the Make Compositing Parent button moves out one level. You can also produce complex compositing by creating nested parent/child groups with compositing parents and children at various levels. In this example, the third track is also a parent, so it is displayed behind the composite of tracks one and two. The third track is also a child, so it is displayed behind track two. The circular region in the mask is transparent, so the second track shows through. In this first example, there are three tracks. how they are composited together) is determined by the parent track.Ĭlick the Make Compositing Child button on a parent track to make a child track.Ĭlick the Make Compositing Parent button on a child track to make a parent track. In general terms, the parent track is the highest track in a group of tracks (often only two) and the behavior of the child tracks (i.e.

The key to understanding overlays, masks, transparency, and compositing is to understand the parent/child relationship between tracks.

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