Xerox DocuMate 152i, Scanning Manual

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Image Enhancements TWAIN Scanning Guide
User’s Guide 47
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 gray level 127 or lower
(darker) should appear as black in the final image.