RE: VueScan to Photoshop

["Paul D. DeRocco" <pderocco@xxxxxxxxxxxxx>]

The dots per inch value is normally stored within the JPEG file, so it's
normally determined by whatever wrote the JPEG file. It surprises me a
little that NikonScan would save a file with the number 72 in it, since when
using it as a Twain driver, it returns the actual DPI, i.e., 2700.

Another possibility is that VueScan, and NikonScan in standalone mode,
doesn't put _any_ DPI information into the file, so Photoshop guesses 72. I
believe this info is stored in an optional record inside the file. In the
more recent versions of Windows, you can see these attributes by displaying
the properties of the file (in Windows Explorer), and selecting the Summary
tab. This would let you see if the Horizontal and Vertical Resolution
parameters are indeed stored in the file.

--

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@ix.netcom.com

> From: Hersch Nitikman
>
> Thanks, Paul. When I've used NS 3.1, it is as a standalone,
> usually scanned
> at 2700, and opened in PS, after saving as a JPEG, and it comes
> up in PS at
> 72 dpi, with no encouragement from me. I don't quite see your
> argument. If
> NS3.1 saved it as a JPEG, with no obvious specification of the print
> resolution, other than a relatively high scan resolution, why does
> Photoshop end up thinking anything with a JPEG compression is naturally
> going to the web? Shouldn't there be a preference for the default
> somewhere?

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