Under the FILTER tab, you will see Mix Blend Mode with a drop-down menu next to it.
You can experiment with the different Blend Modes by clicking the element you want to add a visual effect to and clicking through the different modes in the drop-down menu.
Screen will key out the background of images or videos with a black background.
Multiply will key out the background of images or videos with a white background.
Updated 2 months ago