Slow Scanning Speed
To view the image on a monitor, set the output resolution to around 150 dpi. To
print, set it to around 300 dpi.
Set Fading Correction, Grain Correction, etc. to None.
"Image Corrections and Color
In IJ Scan Utility, deselect the Correct slanted text document / Detect the
orientation of text document and rotate image checkbox and scan again.
Settings (Document Scan) Dialog
Settings (Custom Scan) Dialog
Adjustments" for details.