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Chapter 5. Working with the Video Sequen... > Adding Transitions and Compositing i...
5.2. Adding Transitions and Compositing in the VSE
You can do much more than just cut and paste strips. You can combine and transfer between strips in a variety of ways.
5.2.1. Alpha Overlays
One of the most important compositing features of the VSE is the ability to use alpha overlays. When an alpha overlay is used, the alpha value of the overlaid strip is used to determine the visibility of the strip under it. The alpha values of the overlaid strip range from 0 (transparent) to 1 (completely opaque).
