Post Pro offers forensic services for both audio and visual projects. The primary aspects of audio forensics are to improve speech intelligibility and the audibility of low-level sounds. Visual forensics works much the same way except it applies to images, both still and moving.
Here is an example of before and after photos. The original photo was a film slide that was only 0.5″ by 0.75″. The client wanted to clean the image, but also be able to print a photo that was much larger. Preferably an 8″x10″ photo which is a considerable increase in size.