1. Insert a LOGO picture into PS;

2. Move the mouse to the eraser tool on the toolbar on the left side of PS, right-click to see the pop-up small menu , select the background eraser tool, then move to the red circle above, select "Sampling: Once", as shown in the figure;

3. Move the mouse to the background color, hold down the ALT key, and click Sampling the background color, as shown in the picture;

4. Apply the background color, and paint out all the background color to achieve the effect in the picture, as shown in the picture;

5. Click "File" and then click "Save" to change the format to PNG as shown in the picture, click "Save", and then click OK. In this way, the transparent background of an ordinary LOGO is completed. As shown in the picture.