Avision FB1200 (BF-0709S) - Manual (Page 73)

7-2
Question: While scanning, the scanner often makes noises,
or it scans back and forth.
Answer: Usually this means the memory of your computer is
not enough or the speed of your CPU too slow.
Please try to increase your memory to at least 32M
or replace your CPU with Pentium or later.
Question: Why is it that the scanned image always comes
out to be too dark?
Answer: 1) Modify the Gamma setting to1.8~2.2 for your
monitor and, when printing, set the Gamma
setting to 2.2 for your printer.
2) Adjust the Brightness setting from the TWAIN
user interface to get a brighter image.
Question: The scanner works well except for the line art
image. The lines in the image seem to be much
thicker than the original one.
Answer: Increase the Brightness or adjust the Threshold
setting to improve line art image.
Question: When I choose optical resolution to be 650 dpi,
the "auto crop" and "deskew" functions will be
disabled.
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 an error message.