|1920s Autochrome, scanned and intensified|
The Autochrome is a positive transparency process involving the use of distributed color filters adjacent to a panchromatic emulsion that is reverse processed. Autochromes were widely commercialized with the greatest concentration in France, where they were manufactured. Starch grains, dyed various colors, were used for the color filters, and the color matrix and the emulsion were applied to glass plates.
There are various hints that color film production may cease in the future and it could be that the only color film in production would then be The Impossible Project's integral color product. While this still seems a way off, some people are considering how we will accomplish color photography in large format in the future. There are a number of aspects to the Autochrome that are appealing and that could be useful in the post-digital period.