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[filmscanners] RE: Output Size



While it is possible to both resize the image without interpolation  or to
resize it with interpolation within Photoshop or elsewhere in post
production, it depends on the final end quality that you are seeking and the
final end use that the image will be put to in terms of if it will be viewed
on a monitor, printed on an inkjet, sent to an offset press, etc.  The rule
of thumb generally is to scan at the highest optical resolution that you can
with your scanner at 100%.  Then any resizing later will typically be
possible without having to use interpolation to maintain an adequate
resolution at the increased sizes - especially for inkjet and most offset
press uses.  What you are currently doing seems to be on the mark since such
a scan will yield from a 35mm frame the size you want at an true optical
resolution of 300 + ppi or dpi.  If you scan at a lower optical resolution,
you will get smaller file sizes but magnification of the 35mm frame to the
size you want will result in lower than optimum resolutions which will then
require interpolation which is a second best way to achieve quality
resolutions as compared to the true optical resolutions.

-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Martin Greene
Sent: Monday, February 11, 2002 3:55 AM
To: laurie@advancenet.net
Subject: [filmscanners] Output Size


I usually scan to make 12.25x18.5 inch prints.  I scan at 4000dpi.  I set my
output to the size I will be printing at and to 300dpi.  This makes for
fairly large files of about 50-60M.  Is it necessary to make scans at the
output size and resolution one will ultimately be printing at, or can one
make them any size and resolution and size them up in Photoshop Image Size
before printing?

Martin

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