Fast Overview; Overview Area; Preview Button - Microtek ScanWizard Bio Reference Manual

As a rule of thumb, it is best to use the default maximum settings. You should
change the overview area only if your subsequent overview is too large to be
shown in entirety, or too small for reliable previewing. A smaller overview area
will increase the overview resolution for clearer image viewing. You may also
wish to change the size of your overview to improve performance. Generally, a
shorter overview time results from the scanner motor travelling at a lesser
distance.

Fast Overview

The Fast Overview option supports faster scanning. If Fast Overview is
unchecked, the Overview scanning speed is slow, but a better overview image
quality is obtained.

Overview Area

Choose Maximum Size, other fixed dimensions, or choose Custom Size, then
enter the required dimensions. You may also set the Overview Area by dragging
the dotted borders.
Unit
This lets you set the units for the ruler, such as inch, cm, and mm. It doesn't
function for X-ray film (positive film) scanning.

Preview button

Click this button to get a scanning preview, or to do a new overview. This is
helpful if you have specified custom settings or changed the dimensions.
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