Get a new perspective on a photograph by separating foreground from background in Adobe Photoshop and adding parallax with a 3D camera in Adobe After Effects.
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To create a convincing third dimension in a normal photograph, start with a high-resolution image that contains discrete elements that you can easily separate into foreground and background layers in Photoshop. For example, use the Select and Mask workspace (Select > Select and Mask) to isolate figures in the foreground, remove objects with Content-Aware Fill, and retouch photos with selective uses of the Patch tool, Clone Stamp tool, or Healing Brush tool. The goal is to isolate objects in the foreground and provide sufficient elements — from one or more photographs — to create a convincing background. In our example, we brought in another photo to supply the missing details in the building.
Switching over to After Effects, import the layered Photoshop file as a Composition and accept the default Editable Layer Styles option in the Import Kind dialog box. Press Command/Control+N to open the Composition Settings dialog box. Set the dimensions smaller than the photograph. Drag all layers from the imported PSD file into the new composition so that the background layer is on the bottom. With the layers selected in the Timeline panel, press S to scale them in unison until they fit as you wish in the viewable area of the Composition panel. (If necessary, press P to reposition them too.) Finally, click the 3D Layer switch to make them all 3D layers.
Parallax animation relies on an adequate distance between the 3D layers in z space. Starting with the top layer, press P and position it closer to you in z space (z < 0), then press S and scale it back down to normal size. Position the background layer farther away in z space (z > 0) and then scale it up. Any middle layers can stay where they are or move slightly forward or backward, depending on the scene. The final image should look almost the same as before except that now there’s distance between the layers.
The z-space positioning you choose for each layer depends on the relative distance between these objects in the original scene when the photo was taken. To replicate that shot, create a Camera layer (Layer > New > Camera). In the Camera Settings dialog box, set Type to One-Node Camera and use a Preset focal length that suits the photo.
Position the new Camera layer at the top of the Timeline panel. To get a better perspective on the layers’ relative positions and understand how the camera’s movements affect the final parallax animation, open the View Layout menu at the bottom of the Composition panel and choose 2 Views. Set one view to Custom View 1 and keep the other at Active Camera.
To create the parallax effect, simply animate the camera around 3D space. Twirl down the Transform properties for the Camera layer and keyframe Position and Orientation — and whatever other transform controls you want to change over time.
As you experiment, you may have to press Command/Control+Z repeatedly to undo an unsuccessful camera move. When you like what you see, add easing to the keyframes. Command/Control-clicking a keyframe uses Auto Bézier (circle), which can help smooth the rate of change.
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