Ok, Paul.
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.
-----Original Message-----
From: filmscanners_owner@halftone.co.uk
[mailto:filmscanners_owner@halftone.co.uk]On Behalf Of Paul D. DeRocco
Sent: Thursday, October 23, 2003 12:09 AM
To: laurie@advancenet.net
Subject: [filmscanners] RE: Pixels and Prints
> From: LAURIE SOLOMON
>
> 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.
In practice, I think it's a tangled mass of relatively unimportant
trade-offs, with no clear answer. Scanning at high resolution reduces the
danger of aliasing in the scanner, but increases the danger of aliasing in
the printer. The best would be to scan at the highest resolution, and then
use software with a good resampling algorithm to resample to the optimum
resolution of the printer, or some integer submultiple.
--
Ciao, Paul D. DeRocco
Paul mailto:pderocco@ix.netcom.com
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