For the long-term archiving of digital images, a laser film recorder is being developed. It images color microphotographs on unperforated 35mm silver-dye bleach material in high resolution (pixel-size 3 micrometers).The goal of the archiving process is to achieve a precise colorimetric reproduction. However, color gamut and dynamic range of the photo-material used is relatively small. Consequently, an “archival colorimetric transform” has been developed. Its purpose is to record a maximum of the original's information on the microfilm, using adequate gamut compression based on sensitometric measurements of the photographic material.A modified IT8 scanner target is also recorded on the microfilm as a reference for the reconstruction of the archived color information.