Black Level; Driver Configuration - Xerox DocuMate 3125 Benutzerhandbuch

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Scanning from TWAIN and WIA Xerox DocuMate 3125
White Level
With this option you can set what the scanner should interpret as "white" in the final image,
even though the page being scanned may have a shaded or off-white background. You may
want to adjust this option to have the image automatically corrected when you are scanning
irregular paper, such as thick or thin paper, that may cause the white page in the final image to
appear shaded with a pale grey. This option is only available when scanning in Color or Gray.
For the best automatic results you can simply select the type of paper you are scanning from
the list. Alternatively, you can input a number in the Custom value field. The value you set in
this field can be from 128 to 255. If you set the custom value to 128 you are telling the scanner
that all pixels that are grey level 128 or higher (lighter) should be changed to white in the final
image. If you set the custom value to 255, you are telling the scanner that only pure white is
white and anything lower than 255 should remain unchanged in the final image.

Black Level

With this option you can set what the scanner should interpret as "black" in the final image. If
you are scanning items that have notes written with a pencil, you may want to raise the black
level to have the pencil notes appear black in the image. You can set a value for black from 0 to
127. If you set this value to 127, you are telling the scanner that all pixels that are grey level
127 or lower (darker) should appear as black in the final image. This option is only available
when scanning in Color or Gray.

Driver Configuration

Use the Driver configuration section to configure the add-on modules, select interface options,
and view the scanner hardware properties. When the Advanced configuration mode is selected,
a scanner panel option will be available for you to change any hardware settings that may be
available for your scanner.
User's Guide 7-142