1, open the PS software, and then open a picture.

2. Press Ctrl++ to enlarge the image center.

3. Press Ctrl+- to make the picture smaller in the center.

4. Press Ctrl+ SPACEBAR to enlarge the image locally.

5. Press the left mouse button and drag the area to be enlarged, then press Alt+ SPACEBAR to enlarge or reduce the image with the center of the mouse.

6. Hold down the Alt key, and then drag the wheel to enlarge or reduce the picture.