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User’s M anual
4- 16
Gray
Docu m ent Type: Choice: N or m a l, Phot o, Docum e nt
Three opt ions of docum ent type are provided when you choose
Gray as t he im age type for your scanned docum ent . Choice:
N orm al, Phot o, Docum ent .
Docum ent : Choose Docum ent if your original contains
pure t ext or a m ixt ure of text and graphic since it is an
optim al setting for regular business docum ent . When
using Docum ent , only Threshold can be adj usted.
Ph ot o: Choose Phot o if your original contains photo to
reproduce your phot o in vivid grayscale im age. When
using Photo, no Threshold and Contrast can be adj usted.
N orm al: When using N orm al, Threshold, Bright ness, and
Cont rast can be adjust ed.
Thr eshold: The value ranges from 0 to 255. The default is
230. A low threshold value produces a lighter im age, and can
be used to subdue backgrounds and subt le, unneeded
inform ation. A high t hreshold value produces a darker im age,
and can be used t o help pick up faint im ages. Adj ust t he
threshold setting by dragging t he Thre shold sliding bar t o the
left or right to achieve t he desired t hreshold set t ing.
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