Portrait mode on the Pixel 2 mimics the results of an SLR, and here`s how it works
(Android Police)

The Portrait mode on the new Pixel 2 phones is impressive. With just a single camera, the Pixel 2 and Pixel 2 XL are able to mimic a convincing depth of field effect, like that created by much larger hardware. It isn`t quite as good as an SLR, but it`s a reasonable approximation. And if you were interested in exactly how it works, we`ve put together an explanation.  For the full details, you can read the full Google`s post on its Research Blog yourself, but we`ve assembled a simplified synopsis for exactly how it all works. Read MorePortrait mode on the Pixel 2 mimics the results of an SLR, and here`s how it works was written by the awesome team at Android Police.