Avision FB2100_Green (BF-0505) - Manual (Page 23)

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Example 2：Scanning a two-sided color document, one in
B&W(Drop Blue Color：Threshold：10, Background：79),
the other in color
Side/Image
Selection
Front
Rear
Image Type Description
Color
Choose Color if you wish to scan a color
image for your original in color.
Gray Choose Gray image if your original contains
actual shades of gray.
B&W Choose B&W if your original contains only
text, pencil or ink sketch.
B&W Gray Color