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[filmscanners] RE: Pixels and Prints



Paul,

We may be miscommunicating.  The native optical resolution of my Umax
PowerLook III is 1200 ppi and for my film scanner around 2780 ppi for 35mm
and 1100 for  120 films.  If, for the sake of the argument, I want the size
of the image to be 1:1 at those resolutions, I would be sending the printer
a file whose resolution is more than the printer's native resolution, which
means that the printer would be downsampling the file without any extra
effort at altering the resolution on my part. Thus my question is it
preferable to send the printer images whose unaltered native resolutions are
higher than the printer's native resolution of 720/360 ppi or to send the
printer images whose unaltered native resolutions are lower than the
printer's native resolution of 720/360 ppi.  I realize that in practice we
would be talking about two different image files and not the same image file
with one image file being produced by a scanner with an optical resolution
of less than the printer's native resolution and one image file being
created by a scanner whose optical resolution is greater than the printer's
native resolution wherein both the originals were say 8x10 and were to be
printed at the same size.

In short, is it theoretically better to downsample than to upsample using
the printer, leaving aside questions of if such sampling is better done
prior to sending the file to the printer by PS or some other editing
application?

-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Paul D. DeRocco
Sent: Wednesday, October 22, 2003 7:00 PM
To: laurie@advancenet.net
Subject: [filmscanners] RE: Pixels and Prints


> From: Laurie Solomon
>
> It is very simple Paul; if you scan an image or film frame at 1200 ppi
> or above and do not down sample in PS or another editing program but
> send it on to the printer, you will be faced with this choice.  It is
> only if you DO resample downward in this case would you not be faced
> with the chouce.

But if you scan at a particular resolution, and you want the print to be a
certain size, then you've already determined whether you have less or more
resolution than the printer's native 720ppi resolution.

You can of course change the scan resolution, but in most scanners all that
does is another software resampling, so whether that's good or bad depends
upon the quality of the resampling function. My approach has always been to
scan at the native resolution of the scanner, edit and crop to my heart's
content, and then, if I suspect aliasing might be a problem, upsample in PS
to the next lower submultiple of 720.

--

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

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