1. Open Mito Xiu Xiu to import pictures, as shown in the following figure:
2. Click "Plotter Pen" in the second line, as shown in the following figure:
3. Choose one style according to the actual situation of the picture, as shown in the following figure:
4. Use the matting pen to draw a line on the image that needs to be preserved in the picture, as shown in the following figure:
5. Click Save As Transparent Background at the bottom, as shown in the figure below:
6. Finally, choose to save in PNG format, as shown in the following figure: