For most of today's digital cameras the photos are saved in JPG files. The
date and time at which a photo is taken are stored along with the image in so
called EXIF format. Such date and time
information can be viewed on a PC once the JPG files are transferred from the
digital camera to the PC. When you make a hardcopy of a digital photo by using a
color printer or by sending it to a photo lab, the date and time do not get
printed on the hardcopy photo. By using Visual Photo Time Stamp (vPTS),
the date and time are extracted from the JPG files and superimposed onto the
photos. This way when a hardcopy is made from the JPG file, the date and/or time
will show up on the photo.