1. Open pr and create a new project.
2, first import a background material, the material color is lighter, it will be convenient to observe the change of black background into transparent color.
3. Then import the video material with black background, which will become transparent later.
4. Select the black background material and click the effect control option in the upper left corner.
5. In the effect control panel, select the Opacity option.
6. Select mixed mode to change the normal mode to bright mode.
7. After the blending mode is set to brighten, the black background becomes transparent, and the rest is brighter material pictures.