Note: If you're not a registered member of Apple's Developer Program, you won't be able to download the sample code mentioned in this article.
When Apple introduced iPhone 7 Plus and its dual-camera system, it also introduced Portrait Mode. Portrait Mode uses the dual-camera system on iPhone 7 Plus to capture depth data when it takes a photo and make use of said data to add a pleasing, DSLR-style blur effect to photos. Outside of Portrait Mode's nifty blur, though, we haven't been able to do much else with the depth data captured by our phones. As of iOS 11, though, developers can read the embedded depth data and use it in their own apps.
Blurring out the background of a photo is but one option available when you've got access to a photo's depth. An app might let you add a photo filter, adjust the saturation, or make transparent a specific depth layer within a photograph. There are loads of creative possibilities and I'm looking forward to seeing what developers come up with!
How to capture and visualize photo depth in iOS 11
If you're a registered member of Apple's Developer Program, you can get a simplistic look at what's possible with depth data in iOS 11. Apple's Brad Ford hosted a session back at WWDC 2017 called "Capturing Depth in iPhone Photography" where he explained not only how the dual-camera system captures depth in photographs, but also how developers can make use of it.
You should start by checking out the session, which is chock-full of math (gasp!) and groan-worthy depth puns:
Capturing Depth in iPhone Photography
After you've gotten your fill, it's time to kick the tires on depth data in iOS 11. Apple has provided a couple sample apps to help you both capture and visualize depth data in photographs. They'll give you an idea of what depth information is available and ways it can be manipulated.
- First, download AVCam and install it on your developer device running iOS 11. Remember, it's gotta be an iPhone 7 Plus, iPhone 8 Plus, or iPhone X to capture depth data.
- Launch AVCam on your iPhone.
- Tap Depth Data Delivery: Off so that it says Depth Data Delivery: On. This will include depth data in each photo you take in AVCam.
- Snap a few photos by tapping the word Photo at the bottom of the app.
Photos with depth data work a little differently from photos taken in Portrait Mode. You can use the Photos app in iOS 11 to tell the difference.
- Launch the Photos app in iOS 11.
- Tap a photo that was shot using Portrait Mode or using the AVCam sample app.
- If the photo was taken in Portrait Mode, you'll see a label in the top left corner of the screen that says DEPTH EFFECT.
- If the photo includes embedded depth data, you'll need to tap the Edit button (looks like three sliders) at the bottom of the app. You'll see a label in the top middle area of the screen that says DEPTH. You can tap it to enable and disable the Portrait Mode effect.
How to use WiggleMe to see depth data in all its glory
Enabling and disabling the Portrait Mode effect is one way to visualize depth data in iOS 11, but there's a better, more hilarious way. Apple has created a sample app called WiggleMe that uses depth data to separate the background of a photo from the foreground and add an interesting 3D wiggle effect.
- First, download WiggleMe and install it on your developer device running iOS 11.
- Tap on one of the photos you took using AVCam (the ones that have embedded depth data).
- The app will immediately display a wiggling, depth-adjusted animation of your photograph. It pulls out the foreground from the background and extrapolates the visual info in between to give the image a sort of 3D look. It's pretty awesome! You can also pinch and zoom on the screen while the animation is playing to increase or decrease the intensity of the depth effect.
- Tap the photo once to switch off the automatic animation. The app will use your phone's gyroscope to trigger movement.
- Tap the photo twice to stop the animation and choose a new photo.
Dig deeper!
There's obviously a lot more you can do with depth data in iOS 11, but WiggleMe gives you a quirky look at the feature. If you're registered with Apple's Developer Program, consider downloading the sample apps and using them as inspiration for creating your own photo apps that take advantage of depth data!
The thought of removing a boring background and subbing in an awesome one with just a few taps, making my puppers the center of attention in an otherwise busy photograph, or adding a subtle contrast change to the foreground of a photo has me eagerly awaiting more apps that make use of this data. What about you?
Updated January 2018: This article was updated with new information pertaining to depth data and Apple's developer-focused apps for iOS 11.
