There has been an interesting discussion on comp.periphs.scanners recently about scanners, film grain, noise and aliasing. I wondered why my 2400dpi scanner produces very grainy scans in comparison with prints (and the scanned images are of much worse quality than pictures from my 2Mpix camera because of the grain) and why the grain is more visible in dark areas. Now it’s more clear to me (I hope), especially thanks to the Web page mentioned in the discussion. Basically, grain doesn’t match well with digital technologies and you need a very high resolution device to cope with it.
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