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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

You see grain size vary by tone/color in analogue prints too.  It
would be very interesting to compare CCD scans and inkjet prints to
analogue enlargements.  I'm wondering if the grain variance effect is
similar.

Dave




 




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