Re: [OM] New Player in Scanning?

[Ken Norton]

Dr. Scan wrote:
> 2400 dpi is about 50 lines/mm.  That's about the max that typical
> photographer's get unless on a tripod and using very careful technique.
>   So I don't think you can say that the scanner's resolution tops out at
> 2400 dpi... that's about the max that most photographers are likely to
> feed it.  If the scanner resolves that its own resolution is better than
> that.

The point I was trying to make is that if the film image is topping
out at 50 lines/mm (about 2400 dpi), then you actually need about
double the scan resolution to capture that maximum resolution. You
will only achieve that maximum 50 lines/mm if the details on the film
line up perfectly with the pixels. Any detail that lands between the
scan point is either tossed, aliased or morphed to the nearest pixel.

This isn't just a theoretical point. My 4000 dpi scans will always
yield a better digital image than a lesser scan. Even on images that
have no where near the detail reaching a theoretical maximum.

AG

-- 
Ken Norton
ken@xxxxxxxxxxx
http://www.zone-10.com
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