How to blur the background of Apple's mobile phone portrait mode

Portrait mode can capture the blur effect of portrait photos, and the blur of Apple mobile phone is more natural, and the intensity of blur can also be adjusted. So how is the background of Apple's mobile phone portrait mode blurred? Let's take a look ~

Why is the background of Apple's mobile phone portrait mode blurred?

Adjust the blur intensity when taking pictures:

1, turn on the mobile phone camera and click on the portrait.

2. Click the F button in the upper left corner and select the blur intensity to be adjusted.

Adjust the intensity of photo blur: open the photo in the album, click the "Edit" button in the upper right corner, and readjust the F value.

This paper takes Apple 13 as an example and applies it to ios 15 system.