Avision AV8000S - Manual (Page 36)

5-15
This feature is available when 8-Bit Gray, 8-Bit Color,
or 24-Bit Color is selected on the Image Type drop-down
menu. Highlight refers the lightest point in a scanned
image; shadow refers the darkest point.
Click on the Highlight / Shadow button to access the
Highlight / Shadow Levels dialog box. You can type values in
the text boxes or you can place the mouse cursor over the
line, click the right mouse button, and drag the line to specify
the values you want.
Use the Highlight and Shadow settings together to extend the
range of color and reveal more details in a color image.