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RE: filmscanners: Grain aliasing myth (was Minolta DiMAGE Scan & etc)



On Sat, 30 Jun 2001 11:19:27 -0400  rafeb (rafeb@channel1.com) wrote:

> I also don't really believe in film-grain aliasing -- 
> film grain is essentially non-periodic, or, more 
> accurately "white noise" -- ie, containing 
> an even distribution of frequency element

It's not though - it's pink noise, biased toward a range of frequencies 
(grain sizes) which depend on material, exposure and process. How else do 
you account for grain aliasing (or whatever it is) often manifesting in 
particular areas of an image of similar tone/density, but not elsewhere?

Regards 

Tony Sleep
http://www.halftone.co.uk - Online portfolio & exhibit; + film scanner 
info & comparisons




 




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