I had that problem with my S100 a bit. Its easy to deal with in PS using the clone tool. It only shows up rarely.
http://www.pbase.com/wzictrace
Kanon Powershot S100.
--Hi David,
A friend of mine purchased an S230 about a week ago. I loved the
size and ordered an S400. HOWEVER, many of the S230 images had
spots all over them. They varied is size and location frame to
frame. The Canon rep. said he had not seen that problem before and
that it must be dust between the lens and the sensor. The dealer
exchanged the camera. Last night one of the two photos my friend
took also had the spots. So it is back to the dealer tomorrow.
Now I am getting worried about the S400 that will arrive tomorrow.
I have already purchased a belt pouch for the camera!!!! When
others whip out their cell phone, I can whip out my camea....LOL
Bill Branham
http://members.aol.com/Wsbranham/Page1.html
http://www.pbase.com/wzictrace
Kanon Powershot S100.