Re: Re[3]: filmscanners: Film Scanners and what they see.

[bjs]

----- Original Message -----
From: "Tony Sleep" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Sunday, December 03, 2000 10:15 AM
Subject: Re: Re[3]: filmscanners: Film Scanners and what they see.


> > Uh no, it is not aliasing.  Not even in the slightest.   The physical cell
> > simply acts as low pass filter due to its size and geometry.
>
> That *is* aliasing. I suggest you look it up in a reference book before
obfuscating
> this further.
>

Filtering is not aliasing.  Furthermore, aliasing doesn't occur in the
continuous domain.  And that is where the effect I described occurs.

The inherent softness from a scanner has nothing to do with aliasing.  It is
simply regular, everyday, good old fashioned filtering from the CCD cell.  The
individual cell low pass filters the signal and the result is softness.   It
really isn't any more esoteric than that.

One can design a scanner that doesn't have aliasing and they will find it still
has the softness.

The whole aliasing argument in this context is based on a fundamental
misunderstanding of aliasing  AND basic filter theory as far as I can tell.
But who knows, maybe I'm missing something brilliant.

Byron