Sharp AL-2020 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 document 
glass 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 "Custom Settings" screen.

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 Brightness/Contrast Adjustment" 
setting on the "Color" tab of the 

.

If you are scanning with a WIA-compliant 
application or the "Scanner and Camera Wizard", 
click  

 or 

the 

, and adjust the 

brightness and contrast in the screen that appears.