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Duplex scanning -- one-pass or two?

Posted on 2006-11-08
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Last Modified: 2012-05-05
With respect to duplex scanning, what is the difference between one-pass and two-pass?

Example of context:
"This indicates whether the scanner supports duplex. If so, it further indicates whether one-pass or two-pass duplex is supported."


Thank you
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Question by:InteractiveMind
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Callandor earned 250 total points
ID: 17898688
One-pass duplex scanning scans both sides of an original in a single pass, resulting in less wear to the original and perhaps being faster.  Two-pass scanners may be cheaper, since they only have one scanning head.
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by:InteractiveMind
ID: 17898716
Thank you, Callandor :)

I suppose the names seem somewhat self-explanatory now lol
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Expert Comment

by:Smacky311
ID: 17898745
First off, duplex scanning means it can scan both sides of a two sided document.

One-pass duplex scanning means two imaging units are built into the scanner (one above other below) so you can scan a 2 page document with only 1 pass of the scanner.
Two-pass duplex means your scanner will scan the front of the document...then it has to run another seperate scan for the other side of the document.

So one-pass is theoretically twice as fast as two-pass duplex scanning.
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by:InteractiveMind
ID: 17898782
Thanks all the same, Smacky311 :)
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