Open Photoshop
Import the photo
Crop the image to the required passport ratio
Set the document size to the passport photo dimensions
Adjust resolution to 300 DPI
Straighten the face if needed
Center the head and shoulders
Remove or replace the background if required
Adjust brightness and contrast
Correct color and exposure
Retouch minor blemishes if necessary
Ensure the face is clear and properly lit
Resize the image to the final passport photo size
Save the file in the required format
Print or export the photo as needed