Microtek ScanWizard Industry Reference Manual page 12

However, for some scanner models (ex. MII-900 Plus), you are allowed to resize
the preview area as you wish.
For example, the MII-900 Plus offers you two kinds of dimensions of preview
area, which are 14" x 17" (default) and 14" x 52" (maximum), depending on
which one you select in the Scan Frame settings. You can use the maximum size
instead of the default size for the preview area by entering a value greater than
17, for example, 20, in the Height (H) edit box of the Scan Frame settings. Then,
press the Overview button to perform a preview of the image. Thereafter, the
preview area will be resized to the maximum size of 14" x 52" at once.
Please take note that you cannot use the Scan Frame settings to resize the
preview area given by using the Scan Frame tool.
8 ScanWizard Industry Reference Manual
Default size of preview area
For MII-900 Plus, enter a value
greater than 17 to expand the
preview area up to maximun size of
14" x 52" if needed; enter a value
less than or equal to 17 to reverse
the value back to the default size.
Maximum size of preview area