[filmscanners] RE: Printer drivers at 720ppi

["Roger Smith" <rsmith@unb.ca>]

At 10:33 AM -0500 10/24/03, LAURIE SOLOMON wrote:
>It is funny that you should mention the 240 figure; I also remember a long
>sdiscussion ont he old Leben Epson Inkjet printer list in which it was
>finally concluded that the 240 ppi/dpi number was the optimum resolution to
>send to the printer and any files greater than that were a waste of
>processing time and storage space since the printers would reduce the
>resolution down to the 240 ppi/dpi and the output would show only a
>relatively small improvement over files with original resolutions of 240
>ppi/dpi.  It was also said that this small improvement stopped once the file
>resolution sent to the printer went over 300 or 360 ppi/dpi.

        At the risk of prolonging a rather OT discussion, I can put
in my $.02 worth. I was one of the people from the old Leben list who
did some printer resolution tests - printing files at 240, 300, 360
and 353.359 ppi (the last was to determine if indeed an even multiple
was advantageous to the printer). I tested an Epson1160 and 1270
(both rather obsolete now, so things may have changed).
        I examined the prints with a 4x loupe and could see a slight
improvement from 240 to 300 and on up to 360. The 353.359 ppi print
was identical to the 360 in terms of sharpness. I concluded from this
test that, at least for a regular photographic image (as opposed to a
test chart), there was some advantage to going above 240ppi, but not
much, especially considering the dramatically increased file sizes.

Regards,
Roger Smith

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