1. Open PS, select the File menu, and click Open in the drop-down list.

2. Find the picture that needs to be converted into TIFF format in the pop-up dialog box, and click "Open".

3. After opening, you can see that the title is in jpg format.

4. Click the File menu again and select Save As from the drop-down list.

5. In the pop-up dialog box, find "Format", select "TIFF" in the list, and click "Save".

6. At this time, you can see that the title has changed from the original "jpg" format to "tif" format.