Microtek ScanMaker i700 User Manual page 117

Menu bar
This command allows you to set the parameters for a prescan
image. While the Overview button scans the area specified in the
Overview Setup command, the Prescan button scans only the area
within the scan frame and gives a higher-resolution view of the
image. When the Prescan Setup dialog box comes up, click on the
option you need or specify your parameters.
Fast Prescan
If this box is checked, the prescan process is speeded up, but the
resulting image is grainier. If unchecked, the prescan process is
slowed down a bit, but the resulting image is of better quality.
Keep Prescan Image(s) After Quit
If this box is checked, the preview images stay after you exit
ScanWizard 5. Otherwise, all prescan images are deleted after you
exit ScanWizard 5.
Prescan Image Margins
This option allows you to specify how wide or narrow the margin
around the scan frame is for the prescan image. Options are:
Minimal, Small, Medium, and Large. Smaller margins give you more
room to capture the preview image, while larger margins will allow
you to have more room to expand your scan frame.
This is helpful because selecting the exact scan frame (through the
Scan Frame tool) can never be a completely accurate process, and
what appears to have been selected by the scan frame when you
view the image in the lower-resolution overview may or may not
actually include the portion you wish. The margin — depending on
how wide or narrow it is — can then provide a berth or allowance for
extending the boundaries of the scan frame around the prescan
image. Margin options include minimal, small, medium, and large.
Prescan Image Dimensions
This option lets you specify how large the prescan image will be: Full
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