Blend If Function Photoshop Hands On Demonstration
1. Open the two photos one of the woods and one of the moon
2. Drag moon photo on top of the woods photo or copy the moon photo and paste on the woods photo
3. Name the new layer with the moon "moon"
4. Double Click the moon layer or go to Layer fx Blending Options.
5. Adjust the Blend if at the bottom of the panel for "this Layer". adjust the left handle till the dark background has been blended out and disappears.