The Power of Gray - The Photoshop: Professional Retouching and Compositing Tips, Tricks, and Techniques - page 119

Figure 2.44 Lighting diagram showing the set up on location
1. Go to File > Open and open a suitable window image in Photoshop. Go to Edit >
Copy, then to Select > All, and click the tab to go back to the original image.
2. Go to Select > Load Selection and choose cutout from the Channel menu. Go to
Edit > Paste Special > Paste Into. Go to Edit > Free Transform to resize the win-
dow. Press Return/Enter. Use the Move tool (V) to position the window. Rename
the layer window .