Toshiba 120 User Manual

If you get poor quality as a result of scanning a job, and you cannot improve the quality by changing preferences, refer 
to the check list shown below.

Check your original before scanning. If any dust 
sticks to the original, you cannot obtain a clean 
result. In addition, make sure that the original table 
is also clean.

Make sure that the value for the "Resolution" setting 
in the scanner driver satisfies the requirement of the 
set original.

Reference:

If you are scanning with a TWAIN-compliant 
application and are using "Mono 2 gradation (no 
Green)","Mono 2 gradation (no Red)" or "Mono 2 
gradation (no Blue)" mode, make sure that a 
suitable value is specified for the "B/W Threshold" 
setting. A larger threshold value makes your output 
darker, whilst a small threshold value makes it 
lighter. To adjust the threshold automatically, click 
the "Auto Threshold" button on the "Image" tab of 
the "Professional" screen.

Reference:

If you are scanning with a TWAIN-compliant 
application and the resulting image has unsuitable 
brightness or contrast (for example it is too bright), 
activate the "Auto Contrast/Brightness Adjustment" 
setting on the "Main" tab of the 

adjust the brightness and the contrast viewing the 
scanned output image on the screen.
If you are scanning with a WIA-compliant 
application or the "Scanner and Camera Wizard", 
click "

" or 

brightness and contrast in the screen that appears.

If you are using a TWAIN-compliant application and the 
back side of the original appears faintly in the preview 
image, try adjusting the Brightness and Contrast settings.
Click the 

screen to change to the Brightness/Contrast screen, and 
adjust the "Brightness" and "Contrast" values. A preview 
of the image using the new values appears under "After". 
When the image of the back side disappears and you can 
get only the needed image, click the "Apply" button to 
apply the new settings, and then click the "Scanning" 
button to scan the image.