Enable Time Layer Priority
When this checkbox is not selected all effects are transparent. This means that effects that where effects of different colors overlap the colors will mix. For example, , if a red effect is place on top of a green effect, in the places where the effects overlap the red and green will mix and will be yellow.
When this checkbox is selected the effects on low time layers will render in front of effects on higher time layers. For example, if you place a morph on time layer 1 and you place a scene on time layer 3, then if the morph goes across the same area as the scene then the morph will render on top of the scene. In other words it will look like the morph is above the scene.
For backward compatibility sequences created before this feature was available will have this feature unselected.
Each of the effect dialog boxes has the options Transparent, Semi-Transparent, and Solid. Their behavior is as follows:
Transparent – The effects are transparent. For example, if a red effect is place on top of a green effect, in the places where the effects overlap the red and green will mix and will be yellow.
Semi-Transparent – The colors in an effect that are dim will be transparent, but the colors in the effect that are the full color of the effect will be solid. For example, if a green morph with a tail is placed above a red scene, then the green head of the morph will be solid but the tail will be transparent. This is probably the setting you will want to use for scenes, morphs, and smooth effects.
Solid – All colors in the effect will appear solid. This is probably the setting you will want for use with images, and text.