Xerox 4700 manual Black Level

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.

Xerox® DocuMate® 4700	161
User’s Guide