2. Use the system options to import the original image into snapseed.
3. Click the "Tools" column at the bottom of the picture, and a tool selection menu will pop up. Select the Double Exposure option from the menu.
4. After entering the double exposure option, you can see that there is a row of selection buttons below. Use the first one to import the blue background image that needs to be replaced.
5. Select the second option in the next line and select the overlay mode. I chose "subtraction" because I found that this mode picture can completely cover another picture, so the matting will be more complete.
6. Select the last item of transparency in the next line, and adjust the transparency to the maximum so that it completely covers the picture.
7. When using layer mask, the photo is displayed in blue. Select the layer icon pop-up menu in the upper right corner and select View Changes.
8, smear the picture, smear step is a key step, we can smear the position of the background of the character with our fingers. However, it should be noted that the double exposure value below must be kept at 100 when smearing, and the double exposure value needs to be adjusted to 0 when smearing too much.
9. After daubing, the replacement of the background color of the photo is completed.
10, just add it and export the picture;