Ricoh Aficio FX10 Operator's Manual page 310

Scanner Settings
Scanner settings affect how pages are scanned, and thus can affect text
recognition. To change scanner settings, choose Scanner Settings from
the Settings menu.
Click on the Auto Threshold button (left of the Brightness slider bar) to
enable automatic brightness; the word or percentage next to the
brightness scroll bar will change to Auto.
Image Type
Binary images include line art that are typically black lines on a white
background. Choose Binary for scanning pages with text and line art.
If your scanner supports dithering, you can choose Dithered for scanning
pages of mixed half-tone images and text. A dithered pattern is an
arrangement of black-and-white dots that simulates a half-tone.
Different dither patterns produce extremely different results, and it is
generally much coarser than a half-tone due to the limitation of scanning
and printing at 300 dots per inch.
Page Size
Choose the input size of the page you are scanning. Select Letter to scan
8 1/2" x 11" pages, Legal to scan 8 1/2" x 14" pages, or A4 to scan 21cm
x 29.7cm pages.
Settings Menu
Command Reference - 22