Nikon Scan User Manual page 13

Preview
Clicking the Preview button starts a preview operation.
Before the preview process begins, a prescan operation will be
carried out if the Prescan check box is turned on.
Prescan
check box
PRESCAN ON
Note: Even if the prescan check box is turned on, the LS-4500AF
will not conduct a prescan operation if the cropping area has not
been changed.
If the Prescan check box is turned off when a prescan is
required, the following indication will appear.
This indication appears when a prescan operation has not been carried out
In this case you can carry out the prescan operation after the
preview is completed by choosing Autoexposure from the
Special Capabilities menu.
Note: Depending on the scanner you have selected, the options
which appear in the pop-up menu above may differ from those
PRESCAN OFF
shown here. Please see the appendix appropriate to the scanner
you are using.
Once the preview operation is completed, an image will be
displayed in the Preview display area.
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