Google Blog – November 6, 2017
With portrait mode on the Pixel 2 and Pixel 2 XL, you can take pictures of people, pets and even objects like flowers that keep what’s important sharp and in focus, but softly blur out the background. Portrait mode is powered by computational photography and machine learning, which identifies what to keep in focus and what to blur out.
Source: Frame this: 10 tips for getting great portraits on Pixel 2