Digital BW, The Print

On 05/06/2010 Michael wrote:
> can you scan 35mm film at higher than 3200 dpi and get a better file 
> or does the grain somehow appear accentuated. There's nothing like an 
> actual file to look at rather than all our varying theories. Anyone 
> up for this?


With CCD line or matrix scanners, lower optical PPI is likely to 
exaggerate, not reduce grain, through grain aliasing.

I believe I was the first person to describe this phenomenon, in response 
to a Polaroid technical inquiry c.1999 (they didn't understand why a 
customer was seeing increased apparent grain with some materials).

Grain aliasing was subsequently written up by Pete Andrews at 
http://www.photoscientia.co.uk/Grain.htm
-- 
Regards

Tony Sleep
http://tonysleep.co.uk