With a film target there is very likely a limiting resolution of 50 to 60 line
pairs/millimeter (2540 to 3048 ppi). Resolution should be measured at high
contrast using an etched glass plate at some known spatial frequency and line width.
I believe it would be difficult to determine ultimate resolution using
the Kodak target. There are resolution targets available on glass plate and etched in
metal but these may be impossible to use with a film scanner.
Jim Sims
bjs wrote:
> ----- Original Message -----
> From: "Mikkel H�j" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Sent: Tuesday, September 19, 2000 10:01 AM
> Subject: Sv: Real resolution of a 4000 dpi scanner?
>
> > Have a look for yourself at the attached image. It is the Kodak Q60E3 to the
> left
> > and Provia 100F picture to the right. The lower chops have been downsampled
> > from 00 dpi to 3000 dpi and then back.
>
> They look the same to me.
>
> This suggests the Polaroid/Microtek aren't any better than about 3000 dpi of
> resolution. This is consistent with the group scan results so one would be
> wise to check into this further before plunking their money down for a "4000
> dpi" scanner.
>
> Hopefully someone can do some tests that show definitely whether the Polaroid
> is capable of 4000 dpi resolution or about 50% more resolution than the 2700
> dpi units.
>
> So far the jury appears to be out.
>
> Cheers,
> Byron
>
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