Original picture:
Rendering:
1. Open a photo that needs to be cut out, and then execute CTRL+J twice to copy it to get layer 1 and a copy of layer 1.
2. Create a new layer 2 above the background layer and fill it with blue.
3. Select layer 1, execute CTRL+L to open the Levels adjustment panel, and use the Set White Point Eyedropper to click on the background in the lower right corner to get a white background.
4. Set the blending mode of layer 1 to Multiply, then you can separate very thin hair strands.
