Saving the movies: optical design of a multispectral film scanner

Analog color film scanning must be automated to rescue films from decay in archives, but state-of-the-art RGB scanning requires skilled color grading technicians, who are scarce. Previous work showed how a multi-spectral approach can mostly automate the color grading process, and how incorporating both diffuse and low-NA illumination better reproduces the viewing impression, while enabling standard scratch and dust removal. In this paper, we present the seven LED channel illumination system and the VIS-NIR imaging optical design of this system.