iSRD – Infrared Dust and Scratch Removal
Slides and negatives always have small dust particles and tiny scratches on them, even when handled very carefully.
The OpticFilm 8200i scanner has an infrared channel that finds all the the dust and scratches on the film surface. Infrared light has a very wide wave-length, which allows it to pass through film emulsion of negatives and slides without resistance, as opposed to scratches and dust particles that reflect it. SilverFast iSRD utilizes this behavior as follows.
The image is scanned two times – the first is the regular scan and the second is the additional infrared scan that captures defects like dust and scratches only. Then the calculative dust and scratch removal takes effect, only where the infrared channel has detected any defects without losing any important details.
In conclusion, OpticFilm 8200i Series can automatically remove the dust and scratches from the scanned image.
Dust and scratches are removed during the scanning process eliminating the need for post-process removal of dust and scratches.