Microtek ScanMaker 6100 Pro User Manual page 44

This command helps in distinguishing the current scan frame from
the rest of the preview image for greater visibility of the current
scan frame.
With the Smoked Glass feature turned on, the part of the image
within the current scan frame will stand out, while the rest of the
image (the "irrelevant" material) is relegated to a background
resembling smoked glass.
Before After
The Smoked Glass Background, helps you focus on the part of the
image within the current scan frame, and is particularly helpful
when you are editing a scan frame or applying image-correction
controls. This way, the changes can be seen more clearly and stand
out from the rest of the material. (See the next section for more
details. )
Scan Quality selection
During a scan, the following selections are available:Speed, Quality,
and Best Quality.
Speed:
Higher scan speeds are obtained, but lower image quality results in
the process.
Quality: