Question about Umax Astra 6450 Flatbed Scanner
Flatbed scanners that can scan prints and transparences had two light sources.
One for normal prints (ie reflective light source, the light shines from under the glass to the print/photo and reflects off this print/photo to the optical sensor).
On a scanner that can scan transparences there is a second light source in the lid that shines through the transparences pass the glass to the optical sensor. The light source under the glass is not used in this case.
The scanning software automatically selects the right source when you select to scan prints or transparences.
Posted on Sep 06, 2009
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Posted on Jan 02, 2017
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