dust in front of the lens at the time of the snap. Most likely
the photo was taken while standing on a dirt driveway or parking
area. Digital cameras are notorious for displaying dust as
lightly colored balls. I have tested this by taking hundreds of
photos. This by throwing dust in the air or waiting for a car to
drive by etc. _Jim
Note: Just for
fun, use a spray bottle, nose spray etc, and spray within a foot
of the lens while taking a picture. Be sure to use the flash.
You can also test this by throwing dust, dirt, lint or powder
out in front of the lens while snapping a picture.