RE: scanner glass replacement

["Paul D. DeRocco" <pderocco@xxxxxxxxxxxxx>]

I believe that slight deviations from flatness in glass have very little
effect when viewing something held right up against it, compared to viewing
something far behind it (as when looking through a window). I would also
think that a scanner, since it presses its own nose right up against the
glass, so to speak, would be even less sensitive to ripples in glass than a
person viewing a framed picture through the same piece of glass from a few
feet away. I'm not optical scientist, so if anyone knows that I'm wrong
about this, please explain why. But it would be pretty easy to test: just
install a piece of window glass, and scan a test print of a very fine grid.

--

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

> From: Arthur Entlich
>
> I do understand the desire for optically flat glass
> for this application.  And although window glass that I've seen tends
> toward slow ripples and distortion, most of the framer's glass I have
> worked with has been fairly optically "pure" (although not always).

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