Humanware Prodigi User Manual page 11

 To toggle between color, positive, and
negative contrasts, press and hold the
Back button to access the Settings.
Then, scroll down to select Contrast, and
tap (press your finger down quickly on
the touchscreen) to toggle between the
different contrasts. Press Back to exit the
Settings.
Note: You can either tap or use the Plus-
Minus keys to toggle between different values
in the Settings.
 By default, Prodigi will read aloud the
Settings' menus, items, and values. To
deactivate Speech, press and hold the
Back button, select Speech, and tap.
Press Back to return to your document.
 Diamond Edge contrast will become
available once you freeze an image of
what you are viewing. To freeze an
image, press and hold the Read button.
You will hear a clicking noise indicating
that the document has been captured.
 Press Back to unfreeze the image.
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