Apollo is a new “immersive illumination” iPhone app that lets you edit 3D lighting in Portrait mode photos. The app uses the depth map created by dual camera iPhones, allowing you to post-process photos as if they were 3D renders.
You can add up to 20 new light sources in each photo. Each light source can be adjusted for position in 3D space, light intensity, light spread, and color. What’s neat about the use of depth maps is that light sources can even be added behind your subject for halos and silhouettes.
Here are some videos showing Apollo in action:
At the time of this writing, Apollo is the #3 app in the iTunes App Store’s Photo & Video category. If you’d like to give Apollo a shot, it can be purchased for $2.