1. First prepare the official seal to be cut out. The clearer the better.

2. Click on the window and select the channel, as shown in the figure;

3. Only the blue channel, then make a copy and click to reverse;

4. Load the selection;

5. Copy the cutout layer;

6. Set the background color;

7. Use the stamp and brush tools to Black text elimination;

8. Copy the official seal to the place where the seal needs to be stamped, and adjust the outer glow to make it more realistic;