These can significantly affect on the quality of a 256 level, color scan.
None Applies no screening to the incoming data yielding a threshold image.
This is the usual setting for Line Art. Neutral This setting provides an image that has no correction. Saturated Provides a high contrast, color saturated scan. This setting generally produces the most pleasing scans. You may wish to set the Brightness Menu to 'Make Ligher' for best results when using this selection for color or gray images and 'Make Darkest' for line art scans.