When I scan film or slides, striped rings appear on the scanned images. What should I do?

• A ring-shaped pattern of stripes (called a Newton ring) sometimes appears on scanned images of transparent materials. This may occur if the film is curled.
  
  Place the film or slides with the base side facing up and preview the film using thumbnail preview. Then flip the previewed image by clicking the mirroring icon in the Preview window.