Quote Originally Posted by Photo Engineer View Post
How about "Doomsday Digital Image Preservation - with film!"?

PE
There are a couple of ways to do this, one would be to use a laser to write digital information on B&W film, probably work best with the tabular-grain emulsions, you would need a write density no greater then 4 grains, this means a 25ISO or even a 10ISO film would work best, because the grains can be smaller. A reader would then consist of a scanner type mechanism that would read the image, and confirm whether a grain is ON (dark) or OFF (light). Lossless compression would be required, to minimize the amount of data stored.

The question becomes, how many grains could you get in a given size of film, it's easy to be a 40MB file from a modern digital camera, if you can compress that to half, it's 20MB, if your storage area is 24x36 mm that is an area of 864mm requiring 24,273 pixels per mm at 4 grains per pixel you would need 97,090 grains per square mm, I don't know if that is doable or not.

PE of all the people here, your most likely to know how many grains per mm a modern 25ISO B&W T-grain emulsion would have....