rurmonas@senet.com.au
Date: 12/02/02-09:54:12 AM Z
Quoting Sandy King <sanking@clemson.edu>:
> I am wondering, however, in my particular situation if this is an
> issue. As noted in my initial message, I am scanning 5X7 negatives to
> 4 X 6.5" size, and can scan them either at the full optical
> resolution of the scanner, which is 2450dpi, or at a lower resolution
> for at 360dpi at the print size. As I see it I could print my scans
> at 360dpi at up to around 24X36", without any interpolation, which is
> surely as large as I want to go right now. So, do I need to be
> concerned about interpolation?
Sandy,
No you do not need to be concerned about interpolation.
What your question boils down to:
Will a scan at lower resolution give an equal result to a high res.
scan which has been converted to a lower resolution?
The Epson scanner is designed to scan at 2400 dpi. If you scan at a
lower resolution then it still only looks at a 2400 dpi sized "dot"
but skips most of the possible points. Hence the scanner sees a
sparsly spaced series of small dots.
Using a high resolution scan instead will see the full series of dots.
The resolution reducing tool should take a "clump" of dots and use this
full information to come up with the data for a single "large dot".
This reduces the scanner noise, and will provide a better approximation
to what is really at that point.
So scan at high res. and reduce the resolution in software. Note that
you will only have a large file temporarily. Once you reduce the resolution
it will be the same size as a low res. scan.
Richard
--- Richard Urmonas rurmonas@senet.com.au ------------------------------------------------- This mail sent through SE Net Webmail http://webmail.senet.com.au
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