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Re: [OM] New Player in Scanning?

Subject: Re: [OM] New Player in Scanning?
From: Chuck Norcutt <chucknorcutt@xxxxxxxxxxxxxxxx>
Date: Sun, 22 Jul 2012 17:08:54 -0400
Woohoo!  I agree with Ken.  :-)

Chuck Norcutt


On 7/20/2012 10:36 AM, Ken Norton wrote:
> 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
>
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