Well, here's what I'd call a detailed step-by-step process in making those photos seem to pop out. Now, here are some pictures to show it's being done. Step 1- Open the desired picture on Adobe Photoshop. In this case, the sample is a photo of Gracie Dzienny with nature background. Preferably, it would be nice if your image had a background. Duplicate the photo twice hence forming two layers. For the first layer - go to blending options and turn off red. For the second layer - turn off green and blue. Step 2 - Go to the second layer and move to the left three-five times. In this case, I moved it three times. Step 3 - Under the blending options - darken the first layer. You can see the 3D effect is already starting to take place. Step 4 - Proceed to the second layer. Move the layer three times to the left as well to align the two layers. Step 5 - Under blending options - also darken the second layer. Now you've got the 3D image gone into 3D.
Some of my random thoughts from a hyperactive mind!