Avision IS25 manual - Manual (Page 125)

9.2 Questions in “Scan to PC” Mode
The scanned image always comes
out to be too dark.
Question:
1) Use your application to modify the
Gamma setting to 2.2 and 1.8 for your
printer and monitor respectively.
2) Adjust Brightness setting from the
TWAIN interface to get a brighter
image.
Answer:
The scanner works well except for
the line art, the lines of which seem
much thicker than the original.
Question:
Answer: Increase the Brightness or adjust the
Threshold setting to adjust the line art
image.
When I choose resolution to be 600
dpi, the "auto crop" and "deskew"
functions will be disabled.
Question:
Answer: Since to perform auto crop and deskew
consumes great deal of system
memory, it is suggested if you wish to
perform "auto crop" and "deskew"
functions, please choose your optical
resolution to be smaller than 600 dpi to
prevent a error message.
9-3