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Re: Scanning dpi and epson papers was Re: filmscanners: Repro house skirmishing (l

Investigate it - it's what you want.  From the Help file:
"Prefs tab
Get dpi from/Dpi or width   These options let you specify how to compute the dots per inch (dpi) of the cropped images.  The dpi can be the same as the scanned image, can be explicitly set, or can be computed so  that the width of the cropped image can be a specified number  of inches, cm, or mm.
----- Original Message -----
From: "Rob Geraghty" <harper@wordweb.com>
Sent: Thursday, March 29, 2001 12:07 AM
Subject: Re: Scanning dpi and epson papers was Re: filmscanners: Repro house skirmishing (l

| Derek wrote:
| [epson stuff snipped]
| > If you scan a 24x36mm negative or slide at 300 ppi and
| > then print it at 300ppi, what will be the size of the
| > resulting picture? 24x36mm!
| OK, perhaps the question may have been confusing due to some assumptions
| I made.  In Vuescan, AFAIK you don't get to alter the relationship between
| PPI and the DPI which is encoded into the resulting file.  There was an
| option somwhere for "get the dpi from" I think, but I confess I haven't
| investigated it.  Anyway, using the default settings in Vuescan if you scan
| with an LS30 you get a 2700dpi file.
| By contrast, in Nikonscan you can scan at 2700ppi but output a file which
| has a setting of 300dpi encoded into it - so the printed size would be much
| bigger.
| >A 2700dpi scan implies a 9x magnification factor, so your 300ppi print
| >will come out at 216x324 mm, or slightly larger than A4.
| Yes, Nikonscan has a maximum "magnification" of 900%.  It's not really magnification
| at all - it's just the relationship between the pixels and the encoded dpi.
| >So always scan slides and negs at the best resolution you can get.
| There's reasons I would want to do otherwise, but not when I want to print
| the scan on my Epson.  Presumably the answer to my question is that most
| people (if not everyone) scans a source file at 2700dpi (or whatever their
| maximum optical scanner resolution is) and change the output dpi later in
| Photoshop or whatever editor they use.
| Rob
| Rob Geraghty
| http://wordweb.com


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