Avision IS25 manual - Manual (Page 50)

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 Rear
Front
2
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
5-6