Quote Originally Posted by L Gebhardt View Post
Those look like scanning issues to me, assuming color neg active film. If the film was scratched the film would let more light through, which when reversed would give a dark scratch. My guess is dust on the scanner sensor.
I have had the same problem recently (ie last week) with a roll of 35 mm film I had developed and scanned. I had assumed that it was the camera as it was a "new" old camera but, as you say, scratches in the emulsion will come out as black lines on a positive picture.

So, my question: how does a scanner introduce straight lines when it scans? I must admit that the scan I had done has a lot of dust on the scans (also white, suggesting opaque on the negatives).