The composite transition combines the video data from 2 video tracks into one.
See this tutorial that describes how to use
- Alpha Manipution>Blue Screen
- Composite Transition.
- Crop and Transform>Pan and Zoom effect
- Enhancment>Sharpen Effect
- Alpha Manipution>Alpha Operations
Tutorial 2 - composite transition and Blue Screen
Tutorial showing how to use the "Blue screen" function ,composite transition and Keyframes to animate one image moving over another in the KDEnlive video editor
Tutorial 3 - Video Masks
This tutorial uses the composite transition and a custom video mask to create an effect where you can make it appear that one video is playing on the screen of a still of a computer monitor.