Double Exposure on White
Creating a Double Exposure on a White Background
1. First, open your portrait in Photoshop.
2. Next, make a duplicate layer, then select the Dodge tool from the Tools panel. In the Options bar at the top, set Range: Highlights, Exposure 50% and uncheck Protect Tones. Choose a soft-edged brush tip and paint over the background to make it completely white, using ] and [ to resize your brush tip as you paint. Zoom in to smaller areas to get a clean line.
3. After the background is white, open the image you will overlay over the top of the portrait. (Window>Arrange>2 Up Vertical). Drag the image onto the portrait file.
4. In the layers panel, choose Screen to blend the layers. This will leave a white background any only show the layered image over the portrait. You may also experiment with other blending modes.
5. If you would like to rotate, or make the overlayed image larger or smaller, go to Edit >Transform.
6. You may also make new adjustment layers to change to black and white, or modify color balance, etc. Also remember you can change opacity of the individual layers.
7. You can continue to layer other images over the top of you want!
8. Save your psd file, as well as a jpeg!
ANOTHER TECHNIQUE:
POST-PROCESSING IMAGES IN PHOTOSHOP- DUO TONE STYLE
Bring both images into Photoshop and place them onto two separate layers.
Then on the top layer click the fx tool [layer styles]button at the bottom of the Layers Palette.
Choose Fx>Blending Options
Uncheck the R G B boxes in the ADVANCED BLENDING SECTION. As you click the boxes one-by-one you will see your image change colors!
Once you get the color combination you like hit OK.