Umax scanner question

[algae]

Hi all,
I have a Umax 3400 scanner and use Vistascan software. When I do a scan for example of a white page with text on it, the background shows as slightly "blackish" instead of plain white as the original.
How can I fix this?
Tia
Gary

 

[Ulysses]

http://www.scantips.com

 

[algae]

Great site.
Thx