Using the Multiply and Screen keys

The Multiply and Screen keys use an underlying image as a map to determine what part of the keyed image to make transparent. The Multiply key creates transparency in the areas of the image that correspond to the bright areas in the underlying image. Conversely, the Screen key creates transparency in the areas that correspond to the dark areas of the underlying image. Use these keys to create a subtle superimposition, when the underlying image contains highly contrasting elements.

Adjust the following setting as necessary:

Cutoff Drag to the right until the opaque area reaches a satisfactory level. Higher values produce less transparency.

Superimposing and Compositing > Using keys to superimpose and create composites > Using the Multiply and Screen keys