Fujitsu ScanSnap iX1600 Basic Operation Manual page 376

a The [ScanSnap Manager - Book Image Viewer] window appears in the point retouch mode.
4.
Click on a finger captured in a scanned image with the mouse.
a When a finger is detected, it is indicated with a red dashed outline.
To change a range of the outline, drag the white dot on the outline.
HINT
When a finger captured in a scanned image is not detected, a default outline is displayed
around the finger.
In that case, drag the white dot on the outline to align the outline with the shape of the finger.
When a Document Is Scanned (SV600)
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