You can use picsart software to change the background color of your mobile phone. Here, taking Xiaomi mobile phone as an example, the specific operation method is introduced for reference:

1. First, download and install picsart software in your mobile phone, and then click Open.

2. After opening the picsart software, click the+sign at the bottom of the page.

3. After opening the page, click on all the photos in the upper right corner.

4. After opening the photo album, select the photo whose background color you want to change.

5. After selecting a photo, click on the silhouette.

6. Then click the avatar, as shown in the figure.

7. Wait for the system to automatically dig out the characters, and then click Save in the upper right corner.

8. After picking out the characters, click on the background at the bottom of the page.

9. After opening the background function, click the color at the bottom of the page.

10, select the favorite background color in the pop-up options, and then click the tick icon in the upper right corner.

1 1. After the background color of the photo changes, click the arrow icon in the upper right corner.

12. Click Finish in the upper right corner.

13. Finally, click Save to save the photo with the background color changed.