Hi,
In PTE AV Studio 12 (Beta 15+) we've added a new "Blending" mode to the Mask container with support for 9 blend operations:
Linear Dodge (Add), Subtract, Multiply, Screen, Lighten, Darken, Overlay, Hard Light, and Soft Light.
To use: place the first image into the Stencil, and the second image into the Content of the Mask container. You can add video, text object, rectangle object, or multiple objects (several images, for example).
Watch a video example. Click the play button:
BlendMode.mp4
BlendMode.zip