1. First, open a relatively clear picture with high accuracy. Only with high precision can it withstand various treatments.

2. Click the image on the menu bar, select the drop-down menu and select the image size. The size of the main image is set to 3*3, which is generally the most suitable.

3. Set the picture size to 3*3, and the resolution is 72.

4. A very large picture becomes a 3*3 grid picture. In order to improve the saturation and brightness of the picture, press ctrl U to pop up the interface of adjusting saturation. You can set the hue saturation and lightness according to the characteristics of the picture, so that the picture is close to the real thing and brighter at the same time.

5. Open another prepared watermark. Watermark can be made by yourself or downloaded from some photo websites.

6. Select the drag tool (the top right of the toolbar, where the toolbar in the above picture is clicked), press the mouse and drag the watermark onto the main picture.