Orton Filter

As you click on any object, its properties will appear on the right panel.

Click on the Blend Layers object we just connected and in its right panel properties click on the Screen button (Or select Screen from the combo box)

This will set the Blend mode to Screen.
You may look at the top monitor, the image will appear lighter. The left part of the monitor will show the image at the currently selected object and the right part of the monitor will show the final image at the Output object.