Dell Inspiron 3542, Win 10LTSC 1809, photoshop2020.
1, open the material picture to unlock the layer YanWa.
Open the material picture with photoshop, and pay attention to click the small lock icon behind the layer to unlock the layer.
2. Delete the picture background
Bring up the property panel, and click the "Delete Background" button to delete the picture background.
Step 3 create a white layer
Press Ctrl+Shift+N to create a blank layer, set the foreground color to white, and press Ctrl+Delete to fill the blank layer with white.
4. Set the white layer as the background to save the image.
Drag the created white layer below the transparent image, press Ctrl+E to merge the layers, and press Ctrl+S to save the picture.