[filmscanners] Re: Epson Printing Post Scanning...continued

["Simon Lamb" <simon@sclamb.com>]

Art

Are you saying that 3 x 10,000 element CCDs are better at reducing grain
aliasing than 3 x 8000 element CCDs for example?  Do any other parts of the
scanner make a difference or is it purely the number of elements 'reading'
the film?  I guess the logical conclusion is that some of the more expensive
scanners, such as the Flextight Photo (3 x 8000 CCDs/3200ppi) will produce
more grain aliasing than the current crop of 3 x 10,000 CCDs/4000ppi
scanners.  If that is the case, why would anyone buy the Photo for example.

Simon

Arthur Entlich wrote:

> I'll reply to you in more detail in private mail.
>
> One of the principle advantages of the 4000 dpi native resolution is
> that it should reduce grain aliasing due to the frequency of the CCD
> elements relative to film grain.
>
> Film grain seems to be aliased by scanners in the 2400-2900 dpi range
> due to its frequency.  Sure some films would be more likely to manifest
> it during scanning since not all film has the same grain or dye cloud
> size, and newer films would tend toward smaller grain, but I have found
> overall that the SS4000+ (and I assume this is due to the resolution
> more than anything else), has little to no grain aliasing.
>
> As Kennedy has discussed, grain aliasing is also reduced if the correct
> use of optical filtering occurs, which in this case would be slight
> defocusing.  Have you attempted very slightly defocusing the original
> scan and then using unsharp masking to recover the focus of the correct
> frequency ranges, as he suggested?
>
> Art
>
> HMSDOC@aol.com wrote:
>
> > I think my problem in producing prints is grain aliasing.  It seems
worse on
> > some films compared to others, when I look carefully I can see it in the
scan
> > and sharpening tends to make it worse.
> >
> > Assuming that is what it is, then what is the best way to deal with it,
fix
> > it, or avoid it.  Do different brands of 4000 dpi scanners tend to
accentuate
> > the problem more than others?
> >
> > Howard


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