the most recent additions to the Google Camera is the Lens Blur feature. High-end DSLRs allow you to create photos with a shallow depth of field, making certain subjects appear in focus while leaving the background out of focus, accentuating the subject more. Lens Blur approximates this type of effect digitally (of note: this is the same thing HTC attempted to do with its dual cameras, to limited effect).
More importantly, Lens Blur allows you to change the focus on a picture after the fact. You can only access the option within the Google Camera app itself (it's unavailable even in the stock Gallery or Photos apps). Swipe to the right and tap on the Lens Blur photo you want to edit. Tap the aperture symbol and you can adjust the intensity of the blur with the slider at the bottom, as well as changing the subject of the focus by tapping anywhere on the picture.
When taking the picture, you can also improve the quality of the picture by keeping the subject centered. This may limit the types of shots you can get, unfortunately, but the way the Lens Blur feature works gets the best results from a centered subject. It's not as good as a DSLR, obviously, but for smartphone pictures, it's pretty great.
What you have to do is to download the Google Camera App below (Note: Only for lollipop and higher versions of Android)
