Xerox DocuMate 4760 User Manual page 172

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.
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Xerox DocuMate
User's Guide
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4760