We recommend that you use these scanner settings to optimise documents for OCR accuracy:
File format - PDF or multi-page TIF (the latter may not be possible)
Colour - Full colour or black and white for TIFF (the latter may be the only option for TIF images)
Original type - Text
Resolution - 300DPI
Scanning size -> Automatic detection
Image rotation -> Automatic
File option -> Deselect OCR options when creating a PDF document
Compression -> Low