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[filmscanners] RE: Pixels and Prints



Hi all
 Good question Laurie. I see you have asked it several times. The one about
what the printer does with the binary data you send it. I vaguely recalled
seeing this explained, so it didn't take long to find this link
http://www.ddisoftware.com/qimage/quality/
 The Lanczos interpolation really does seem to make a difference.
Darrell

-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Laurie Solomon
Sent: Thursday, October 23, 2003 5:50 PM
To: loginguy01@telusplanet.net
Subject: [filmscanners] RE: Pixels and Prints


Bob,

If true than I would think that this would be something important to
know and play an important role in how one approaches things.  I would
have thought that to maintain quality output, they would have selected
to design the printers to resample rather than merely discard pixels in
an arbitrary or random manner.
Surely, they use some sort of formula for determining what to discard
and what to keep.


filmscanners_owner@halftone.co.uk <> wrote:
> Laurie,
>
> I thought I had read somewhere that if you send images to the Epson
> driver with dpi that are larger than its native dpi (360/720) it
> simply discards rows of pixels as scanners often do, rather than
> downsample them by any interpolation method.
>
> Bob Frost.
>
> ----- Original Message -----
> From: "LAURIE SOLOMON" <laurie@advancenet.net>
>
> I do concur with your conclusion; and in practice, do what you
> suggest. From a theoretical point of view, I was just curious about
> the answer to the question given that so many in the discussion were
> arguing that if one sent the printer a file with less than its native
> resolution the printer would perform an interpolation using nearest
> neighbor techniques which would lower the quality of the output but
> did not mention the effect of the oposite case where one sent a file
> that had a resoution higher than the printer's native resolution.
> Thus, leaving open the question as to which theoretically would be
> the best option to take if one were to have a choice - e.g., letting
> the printer upsample to its native resolution or downsample to its
> native resolution.
>
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