From: Phillip Murphy (pmurf@bellsouth.net)
Date: 12/02/02-01:05:05 PM Z
Hi Sandy,
Since you'll need to interpolate the data to scale up to 13x19, (I'm
assuming the target is for a 2880dpi or 1440dpi inkjet printer)
use the true optical resolution of the scanner. (2400spi)... If I'm not
mistaken, this scanner is capable of two pass scanning which you
can use to extend the dynamic range. I recommend Vuescan software over
Epson's. When you res-up the image in Photoshop or livepicture,
use a final ppi of 360 for the image. (this will give you slightly better
printer software interpolation). If you're using a service bureau, find
out what
they recommend as being optimum for their printer. (this could be anywhere
between 288ppi and 400ppi).
Using plug-ins such as MrSid or Genuine Fractals Print Pro (both from
LizardTech, Inc.) to res-up your image will give you a slight advantage
over
Photoshop's engine.
Needless to say, if your goal is transcribing the negative or transparency
with accuracy, a film scanner will yield superior results hands down
unless you're
working with something on the order of a Heidelberg flat-bed scanner.
best regards,
Phillip
Sandy King wrote:
> I have a scanning resolution question.
>
> Situation is this. I am scanning a 4 X 6.5" section of a 5X7" color
> negative with the Epson 2450 flatbed scanner, which has optical
> resolution of 2400 dpi, using SilverFast scanning software as a
> plug-in to PhotoShop. The eventual purpose of the scans is to make
> color prints approximately 13X19" in size, or to make negatives for
> alternative printing. I understand that a maximum resolution of a
> little over 300 dpi at the printing size is needed for either purpose.
>
> My question is this. What are the pros and cons of of the two
> following scenarios: 1) scanning at 100% of the 4 X 6.5" negative
> size at the maximum optical resolution of 2450 dpi, re-sizing later
> in PhotoShop, or 2) scanning at the desired printing size of 13X19"
> 300dpi?
>
> Sandy King
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